This article introduces synthetically using RS, GIS and GPS (3S) technology to study ecosystem changes of Talimu river system within past 11 years. In this article, the data were analyzed by using GIS technology and the field sizes were investigated by using GPS instrument. A conclusion was concluded that in the past 11 years 1990 to 2000, in the region of the middle and lower reaches of Talimu river, the area of farmland had been increased 505,433km², the area of nature/planted vegetation had been reduced 943,089km², and the area of water body had been increased 80.477%. The area of desert in the middle and lower reaches of Tamilu river is increasing continually. The main reason is that the large number of nature vegetation was died, especially in the area of Huyang woods was declined. Finally, some suggestions were make to recover and father fragile ecosystem.

Single sensor night vision system has been developed for many years, but it still has many intrinsic limitations. For example, in a single channel imaging system the image contrast will be too low to distinguish different targets. As a new technique, multi-sensor image fusion color night vision is developed. This system can make up a single sensor's limitation and improve the system's performance. Depending on Sharmon's formula of the information theory, this paper describes the formula of the fusion image's amount of information and proves that multi-sensor image fusion technique is good at increasing amount of information. Then according to the information theory, the LLLCCD and IRFPA image fusion system is developed. The system's block diagram is given and described in detail in this paper. And the improved fusion algorithm is adopted which is especially good at this fusion system. At last the impersonal judgment of fusion effect is employed to analysis this system's performance and the practical image is given to show this system's good effect.

This paper is focused on the restoration of color remote sensing (including airborne photo). A complete approach is recommended. It propose that two main aspects should be concerned in restoring a remote sensing image, that are restoration of space information, restoration of photometric information. In this proposal, the restoration of space information can be performed by making the modulation transfer function (MTF) as degradation function, in which the MTF is obtained by measuring the edge curve of origin image. The restoration of photometric information can be performed by improved local maximum entropy algorithm. What's more, a valid approach in processing color remote sensing image is recommended. That is splits the color remote sensing image into three monochromatic images which corresponding three visible light bands and synthesizes the three images after being processed separately with psychological color vision restriction. Finally, three novel evaluation variables are obtained based on image restoration to evaluate the image restoration quality in space restoration quality and photometric restoration quality. An evaluation is provided at last.

Color image process is a very important problem. However, the main approach presently of them is to transfer RGB colour space into another colour space, such as HIS (Hue, Intensity and Saturation). YIQ, LUV and so on. Virutally, it may not be a valid way to process colour airborne image just in one colour space. Because the electromagnetic wave is physically altered in every wave band, while the color image is perceived based on psychology vision. Therefore, it's necessary to propose an approach accord with physical transformation and psychological perception. Then, an analysis on how to use relative colour spaces to process colour airborne photo is discussed and an application on how to tune the image tone in colour airborne image mosaic is introduced. As a practice, a complete approach to perform the mosaic on color airborne images via taking full advantage of relative color spaces is discussed in the application.

Given essential matrix, an analytical solution of the camera's motion parameteres is provided in this short note. To our knowledge, there has been no similar report in the literature up to now.

This paper presents a novel approach for creating 3D free-form scene models from a single paiting or photograph with no prior knowledge about the shape. The new technique takes as input a sparse set of user-specified constraints, and generates a well-behaved 3D surface satisfying the parameters. As each constraint is specified, the system recalculates and displays the reconstruction in real time. In contrast to previous work in single view reconstruction, our technique enables high quality reconstruction of free-form curved surfaces. A key feature of the approach is a novel hierarchical transformation for accelerating convergence on a non-uniform, piecewise continuous grid. The technique is interactive and updates the model in real time as constraints are added, allowing fast reconstruction of photorealistic scene models. The approach is shown to yield high quality results.

Due to the complex motion of a target, the Doppler frequency shifts are time-varying. Therefore, the inverse synthetic aperture radar (ISAR) image is blurred by using the Fourier analysis for Doppler processing. To resolve the image blurring problem, a parametric method which combines the matching Fourier transform with the CLEAN technique is presented to retrieve Doppler information. For comparison, a time-frequency transform, named reassigned Gabor spectrogram, is also applied to the time-varying spectral analysis. Simulation results show that the suggested method is robust to small data size and low signal-to-noise ratio.

This paper presents a wavelet-domain Hidden Markov Tree(HMT)-based color image superresolution algorithm using multi-channel data fusion. Because there exists correlations among the three channels of a RGB color image, a channel by channel superresolution method almost certain leads to color distortion. In order to solve this problem, first the low-resolution color image is converted into a gray-scale image using the spatially-adaptive approach presented in this paper and the resulting gray-scale image must reflect the human perception of edges in the color image; then by superresolving this gray-scale image, a high-resolution image is obtained; finally, wavelet-domain HMT-based image superresolutions are performed for the three channels of the low-resolution color image using the same posterior state probabilities, which reflect the hidden states of the wavelet coefficients of the high-resolution gray-scale image obtained before, and thus the resulting high-resolution color image is what we desired. Becasue the correlations among the three channels of a RGB color image are considered, there are no color distortions in the reconstructed high-resolution image. Experimental results show that the reconstructed color images have high PSNR and are of high visual quality.

A method for automatic segmentation and detection of small target in the earth to sky background was presented in this paper. When small target in far distance some objects on ground came upon to the scene. This always resulted in false detection in automatic detecting systems if we segmented small object by only using its illumination. In order to remove the big block and disconnected part of a gradient image was made because the gradient scale of the small target and background objects may be comparatively similar. Then an adaptive threshold method was adopted by using the image means as a threshold for several times to segment objects in the gradient image. After that successive over-relaxation was used to incorporate the disperse regions and the nearby isolated points would connect to the big block. The lowest value of valley (nonzero value) was searched and this value was used as the threshold to make binary image. So the connected clutters could be removed only by counting the number of pixels in the connected regions. Eventually the pipeline target detection algorithm was used to process the sequential images to detect the real small target automatically.

In this paper a residential area texture description based on the 3 x 3 region grey deviations is designed and the Gauss blur is applied to make the residential area in the texture character image possess accordant grey value and limited contrast relative to the background area so as to obtain self-adaptive threshold for image segmentation. And a skeleton processing is proposed to eliminate the road from the residential area. The experiment results of the semi-automatic extraction of the residential area in the remote sensing image with 3 meters ground resolution show this technique is very simple and effective to the semi-automatic extraction of the residential area and can meet the precision requirement of the mapping and surveying with satellite images.

Automatic extracting and updating road networks is a key work for updating geo-spatial information especially in developing countries. Aiming at the deficiency of the perceptual grouping based on geometric relation and based on the similar relation, a new perceptual grouping method that is so-called the perceptual grouping based on teh whole relationship is presented. In this method, all kinds of information including geometric properties, image attributes and other information are group based on the similarity rules. Based on this new grouping framework, the principles and the procedures of automatic road segments grouping are described in detail from two aspects: one is automatic perceptual grouping for similar road segments and another is automatic extended road segments for no-similar road segments. At last some discussion for new perceptual grouping strategy is given.

On the basis of analysis for degradation model of image due to uniform Liner motion, this paper deduces restoration model of image blurred by uniform Liner motion, and constitutes a kind of cost function of restoration. By analyzing the rule of cost function, the paper proposes an algorithm estimating motion parameter. The results show that the algorithm is very efficient to the restoration of image blurred by uniform. Liner motion when velocity on uniform Liner motion isn't very large.

This paper presents an event based soccer video retrieval method, where the scoring even is detected based on Bayesian network from six kinds of cue information including gate, face, audio, texture, caption and text. The topology within the Bayesian network is predefined by hand according to the domain knowledge and the probability distributions are learned in the case of the known structure and full observability. The resulting event probability from the Bayesian network is used as the feature vector to perform the video retrieval. Experiments show that the true and false detection rations for the scoring event are about 90% and 16.67% respectively, and that the video retrieval result based on event is superior to that based on low-level features in the human visual perception.

A new road recognition algorithm based on local statistical features and principal component analysis is introduced to improve whose robustness and adaptiveness. The weights of the principal component neural networks is trained with the aid of the algorithm of generalized Hebbian learning rule, and the input vectors of the local spatial features and image pixels value are transformed into feature vectors which are once clustered by K-means classifier, the road surface and un-road surface can be distinguished by the reference area finally. The simulation results confirm the fine robustness and adaptiveness of the newly proposed algorithm, especially, the improved performance to recognize road images affected by illumination variations or shadows.

In this paper, trademark is regarded as a combination of several geometric regions which have sharp edges. To retrieve such a combination, a method based on its member regions' shape and spatial features is proposed. Since the way considers the shape feature adn spatial relationship at the same time, so it can ensure the consistency in both the local and whole sides. Compared with the method of only using shape feature to retrieve the trademark, the results of experimentshow this way has higher precision and the output accords with people's visual feeling better.

Texture Mapping plays a very important role in Computer Graphics. Texture Synthesis is one of the main methods to obtain textures, it makes use of sample textures to generate new textures. Texture Transfer is based on Texture Synthesis, it renders objects with textures taken from different objects. Currently, most of Texture Synthesis and Transfer methods use a single sample texture. A method for Texture Synthesis adn Transfer from multi samples was presented. For texture synthesis, the L-shaped neighborhood seaching approach was used. Users specify the proportion of each sample, the number of seed points, and these seed points are scattered randomly according to their samples in horizontal and vertical direction synchronously to synthesize textures. The synthesized textures are very good. For texture transfer, the luminance of the target image and the sample textures are analyzed. This procedure is from coarse to fine, and can produce a visually pleasing result.

This paper combines the template-based method and color-based scheme to construct an adaptive skin-color model for human face detection in news videos. A heuristic rule-based decision tree is then employed to verify the resulting skin-color regions. The skin-color model comes from the sample pixels from the target video shots, so well tuned to adapt to various videos. It is a general scheme for color-segmentation, not depend on any pre-defined skin-color range. Our experiments shows that the face detection performance has been improved greatly, compared with the pure template based face detector. The face retrieval module is based on the Self-Eigenface method, where the Self-Eigenface space is constructed from the pseudo frontal faces obtained by region tracking.

In order to improve photolithographic resolution and focal depth of a projection photolithographic imaging system with an enough large numerical aperture, the basic principle of pupil phase-shift filtering has been investigated in detail. The mathematical model of filtering, the simulation and the photolithographic experiments have been carried. The theoretical analysis and experimental results show that both the photolithographic resolution and focal depth have been obviously improved with pupil phase-shift filtering. At the same time, the photolithographic window has been increased. Compared with amplitude filtering, the utilization of light energy and the potential ability to improve image quality of the phase filtering technique is fully excavated. It is an effective wavefront engineering technique for improving both photolithographic resolution and focal depth.

Waveshrink has been proven to be a powerful tool for the problem of signal extraction from noisy data. A key step of the procedure is the selection of the threshold parameter. Donoho and Johnstone propose of the threshold based on a SURE procedure for real signals. In this paper, we discuss the issue of threshold selection for complex signals in Waveshrink. We first review the threshold selection procedure based minimax thresholds and then propose to extend the use of SURE procedure for denoising complex signals with complex wavelet transforms. At last, an example is used to show that the extended SURE procedure is an effective method for denoising complex signals.

A new method for feature selection using radial basis function neural networks based on fuzzy set theoretic measure is proposed. The network's input values are all the membership of f feature values in a certain sample appertaining to C lcass (f: the amount of features, C: the amount of classes). Here, the fuzzy set theoretic π measure based on the normal distribution is used for computing the membership. Hence, there are f x C π measurements that are used as the inputs of the neural network. A radial basis function neutral network with increasing hidden nodes is trained for classification, which is believed to be able to perfectly simulate the nonlinear relevance among the inputs. And then, we set zero to the C input nodes concerning one feature (we call this input vector the revised input vector), which means as far as this feature is concerned, it belongs to none of the classes, which is considered to be the real delinking. The deviation between the output corresponding to the revised input vector and the expected output corresponding to the unrevised one is thought to denote the impact and the importance of this feature. Through this way, we may rank the features and select a suitable feature subset. Effectiveness of this algorithm is demonstrated on several sets of data, and compared with the effect of the feature-bsed node-prune MLP neural network method.

A novel face detection algorithm under hypothesis-verification scheme is presented, which includes three stags: skin region extraction, face candidate generation, and face candidate verification. This algorithm has several advantages: first, the skin chroma chart is fuzzily enhanced, which guarantees better discriminant power; second, through post-processing the extracted skin regions, overlapped regions are separated, which reduces the face detection complexity; third and the most important, maximum valley peaks from morphological operations are used as the invariant facial features for face hypothesis, which are more stable and accuracy than the commonly used valley block centers; fourth, to speed up the system, a multi-threshold fusion based image segmentation algorithm is proposed to constrain unreasonable candidates. At last, support vector machine is used for face verification, which is perfect for this task. For more than 1000 face images with different sizes, poses, expressions and lighting conditions, also including some gray images, the false rejection rate (FRR) is below 0.8%, false acceptance rate (FAR) is below 2.5%, and the average detection time is 2.55s. Experiments also show that the eye locations are very accuracy.

Based on analysis of many image change detection methods, a new method of multidimensional change template analysis is proposed in this paper. The new method combines the use of GIS knowledge and the advantages of other change detection methods. It has been used to detect change and update image database for the different temporal digital orthophoto maps (DOM). Test results show that this method is effective.

This paper presents an automatic video based face verification and recognition system by Support Vector Machines (SVMs). Faces as training samples are automatically extracted from input video sequences in real-time by LUT-based Adaboost and are normalized both in geometry and in gray level distribution after facial landmark localization via Simple Direct Appearance Model (SDAM). Two different strategies for multi-class face verification and recognition problems with SVMs, "one-vs-all" and "one-vs-another", are discussed and compared in details. Experiment results over 100 clients are reported to demonstrate the effectiveness of SVM on video sequences.

This paper presents a new method for locating eye accurately. In the first stage, the proposed method finds the coarse eye region from image using genetic algorithm based on the edge information and intensity distribution information. In the second stage, ellipse detection is employed to extract the boundary of the iris. The experimental results have shown that the proposed method can locate eyes accurately from the input image with complex background.

In this paper a new algorithm to locate the Elastic Labeled Graph is proposed for the face recognition approach based on Gabor wavelet jets. We extend Direct Appearance Model (DAM) to a hierarchical organization, which performs faster and more remote compared with the traditional graph localization method used in Elastic Bunch Graph Matching. A tracking recognition scheme is further discussed through employing the hierarchical DAM in a video sequence. Experimental results demonstrate the effectiveness of the method in locating and tracking the elastic graph.

This paper present an approach based on improved hybrid elastic model for deformable image registration. This method utilizes the linear spring net model for correspondence, and the thin-plate spline for non-rigid mapping. Compared with the original model, this improved method uses not only the intensity information, but also the weighted gray level histogram and the image gradient for similarity measurement. A multi-resolution strategy is involved to decrease the computing complexity and to increase the precision. Some experiments are performed on both synthetic and segmented medical images.

Independent Components Analysis (ICA) is an effective approach of blind source separation and has been received much more attention because of its potential application in signal processing such as telecommunication and image processing. Feature extraction of images has been also focused as one of prominent applications of ICA. Nine Stroke Density (NSD) feature extraction method will provide sufficient information to the recognition engine. Several other feature extraction methods are discussed and compared to stroke density method in detail. ICA extracts the underlying statistically independent components from a mixture of the NSD feature vectors. These independent components are feed into the neural netowrk for the recognition purpose. The experiment results show that ICA performs well for feature extraction and this proposed method is more effective in recognizing handwriting character than merely using neural networks directly.

The elliptic curve cryptographic random sequences as watermark are embedded in wavelet transform domain of the cover image. This algorithm takes advantages of the multiresolution feature of wavelet transform and non-relevant feature of the cryptographic random signal. The cryptographic random sequences are generated by the elliptic curve group and Galois Field function selected. The experimental results demonstrate that the scheme proposed is security, invisible and robust against commonly image processing techniques.

This paper presents a novel approach for mobile robot localization using monocular vision. The proposed approach locates a robot relative to the target to which the robot moves. Two points are selected from the target as two feature points. Once the coordinates in an image of the two feature points are detected, the position and motion direction of the robot can be determined according to the detected coordinates. Unlike those reported geometry pose estimation or landmarks matching methods, this approach requires neither artificial landmarks nor an accurate map of indoor environment. It needs less computation and can simplify greatly the localization problem. The validity and flexibility of the proposed approach is demonstrated by experiments performed on real images. The results show that this new approach is not only simple and flexible but also has high localization precision.

In this paper we obtain higher pattern analysis through the fusion of uncorrelated discriminant vectors, correlated discriminant vectors and kernelized discriminant vectors by some fusion theory and technology which is carried out by some estimation method of multi-feature. Based on some different features such as linear and non-linear features, correlated and uncorrelated features, one estimation method of multi-feature is proposed to fuse these different vectors. Finally experiments on human face recognition are carried out and prove our methods to be available.

We construct kernel uncorrelated optimal discriminant vectors(KUODV) for non-linear feature extraction and discrimination. Employing the uncorrelated optimal discriminant vectors(UODV) and kernel method, we propose non-linear generalization of uncorrelated optimal discriminant vectors, and then enhance the performance of original UODV. Human face recognition experiments show the utility of our new method.

In the field of data mining, it is often encountered to perform cluster analysis on large data sets with mixed numeric and categorical values. However, most exciting clustering algorithms are only efficient for the numeric data rather than the mixed data set. For this purpose, this paper presents a novel clustering algorithm for these mixed data sets by modifying the common cost function, trace of the within cluster dispersion matrix. The genetic algorithm (GA) is used to optimize the new cost function to obtain valid clustering result. Experimental result illustrates that the GA-based new clustering algorithm is feasible for the large data sets with mixed numeric and categorical values.

A new general method of the automatic selection of guide star, which based on a new dynamic Visual Magnitude Threshold (VMT) hyper-plane and the Support Vector Machines (SVM), is introduced. The high dimensional nonlinear VMT plane can be easily obtained by using the SVM, then the guide star sets are generated by the SVM classifier. The experiment results demonstrate that the catalog obtained by the proposed algorithm has a lot of advantages including, fewer total numbers, smaller catalog size and better distribution uniformity.

In recent years, the Asian dust storm project was carried out. One of tasks was to study dust rising mechanism in dust source area. Surface temperature condition was regarded as one of the important factors for dust rise. In the study we retrieved surface temperature by using NOAA/AVHRR data. Basedon the published articles, traditionally, split window algorithm was use to deriving surface temperatures in the case of our study area mostly desert area, there was only three field observation data available in Talimu basin, at Dunhuang and Changwu. It was very difficult to validate the results. However, there were 52 county wearther observation stations in the area. The data might be used as import data in artificial neural network calculation. Most success examples of remote sensing data classification by using neural networks were in the condition of network training and classifying in the same types of data such as spatial data. For the use different data type collected by different techniques system such as satellite system and ground weather observation data to training, to find rule and to direct classification could be more impersonal which was one of the nature of artifical neural network method. In our case 52 weather temperature data were used from 52 observation stations where they were also the same positions for collecting AVHRR 1b data CH2, CH4, CH5 thermal data. Both groups of data were applied as fundamental import data in for artificial neural network calculation. Finally resultant rule was applied for classifying 15000 x 3 pixels in the whole area. The result was more reliable than that of split window not only because uncertainty caused by variations of topography but also it was very difficult to validate in field.

A novel method of optimizing feed-forward neural networks using cascaded genetic algorithm is proposed in this paper. It adopts a hybrid encoding method, which architectures and connection weights vector of neural networks are encoded into binary code and real-value code respectively. The proposed optimizing method includes two cascaded evolutionary procedures in which the first mainly plays the role of fast search in constrained area and the second extends global exploration ability. The proposed method has represented a particular compromise between exploitation and exploration of searching optimized neural networks and enhanced the global search ability while using less computation. The experimental results have shown its good performance.

With the development of non-contact measurement in the close range photogrammetry, the use of the slide projector becomes familiar and frequent. In order to take full advantage of the slide projector in the procedures of diverse photogrammetric measurements, the slide projector needs to be calibrated at first. Namely, the intrinsic paramters of the slide projector have to be calibrated in advance. In this paper a flexible technique is proposed to calibrate the slide projector easily. The technique only requires an ordinary slide projector, a camera and a planar grid. The algorithm with 2D direct linear transformation (2D-DLT) and collinear equations is used to calibrate the slide projector. The operation method in detail and the algorithm are addressed systematically and entirely. First, the restricting condition among 2D-DLT parameters is worked out using the correspondence of 2D-DLT and collinear equation. Then, the decomposition of initial values of the slide projector intrinsic and extrinsic parameters using 2D-DLT is deduced. Finally, the slide projector calibration parameters are worked out by the whole adjustment. The feasibility and the exactness of the slide projector calibration technique put forward in this paper are verified by the results of real data.

Determination of image exterior parameters is a key aspect for the realization of automatic texture mapping of buildings in the reconstruction of real 3D city models. This paper reports about an application of automatic aerial triangulation on a block with three video image sequences, one vertical image sequence to buildings' roofs and two oblique image sequences to buildings' walls. A new process procedure is developed in order to auto matching homologous points between images in oblique and vertical images. Two strategies are tested. One is treating three strips as independent blocks and executing strip block adjustment respectively, the other is creating a block with three strips, using the new image matching procedure to extract large number of tie points and executing block adjustment. The block adjustment results of these two strategies are also compared.

The 3D reconstruction of video sequences in this paper need not to know the parameters and locations of the camera. First step of our reconstruction is feature point matching and stereo correspondence by Singular Value Decomposition (SVD). After getting the redundant information between image sequences, we introduce stratification algorithm to get 3D model. We at first get 3D model in projective space, and then get that of Euclidean space by using constrain information.

Advances in echocardiographic systems and computer applications have made three dimensional reconstruction of anatomical structures possible which open a new and fascinating field of color Doppler flow image, but the spatial shape and quantitative evaluation of mitral eccentric regurgitation is often difficult in the clinical setting. In this paper, we present a method to complete the 3D reconstruction of the mitral eccentric regurgitation, mitral eccentric regurgitation information was first derived from color Doppler flow images and then the mitral eccentric regurgitation velocity values was mapped according to the color bar in the images. With the proper method of interpolation and rendering, the experiment result of 3D visualization of mitral eccentric regurgitation is satisfying. Measurements from a 3D reconstructed flow convergence region may be superior to measurements from 2D color Doppler recordings to calculate volume flow, 3D mitral eccentric regurgitation reconstruction is possible and opens new possibilities in flow quantification. Futher study of the method may be very helpful in the diagnosis of heart diseases.

Many methods have been brought forward for reconstruction of 3D objects. Niem proposed an automatic method which can be realized in a simple measurement environment. However it used a planar calibration pattern that was unable to retrieve the depth of the points. This makes it difficult for the object whose top is on a plane to be perfectly reconstructed. In this paper, we propose an interactive method to solve this problem.

This paper proposes a 3D reconstruction method based on the decomposition of matrix. The method uses the Singular Value Decomposition (SVD) of the fundamental matrix, which leads to a particularly simple form of the Kruppa equations optimized by conjugate gradient method. The derivation doesn't need the somewhat non-intuitive geometric concept of the absolute conic. After the projective depths are estimated, the non-singular 4x4 matrix is obtained to realize the Euclidean reconstruction. Experimental results demonstrate the effectiveness of the proposed method.

To resolve the problem of approximating scattered points with closed boundary curves constraint, several methods has been analyzed and a central-point based method has been given here. The key process is to construct inner curves connecting the central point of whole region and middle point of each boundary curve, and divide the whole region into n piece of rectangular patches, so we can construct a base surface with Coons patch. An example of pentagonal surface is given to illustrate this scheme.

Reconstruction of 3D objects and scenes based on 2D images is one of the most important topics in computer graphics and computer vision. Traditional visual hull reconstruction methods cannot correctly handle the situation wehre part of the object's concave surface is not reflected on the 2D silhouettes -- for example, the inner surface of a cup cannot be recovered frmo its photo images at any angles. In this paper, a new algorithm is presented to solve this problem, focusing on the passive reconstruction with local application of active methods as a complementation. The basic idea is to first obtain a 3D model from the octree hull reconstruction method, then apply some assistant facility to get the local information of the concave surface, and finally combine the two pieces of information together to obtain a more accurate surface model of the object.

A new vision location method based on radical basis function networks (RBFN) is presented in this paper. It fully utilizes the excellent ability of RBFN to approach the nonlinear mapping and have a good performance of high learning rate and adapting the different environment generalization. It sets up a non-linear relationship between the space sample points and the corresponding image information by learning, instead of traditional calibration method, and can be used for 3D measurement. In our lab, it was applied to 3D vision location system based on a multi-linear photoelectrical sensor system. Then experiment proves that it can quickly realize high-accuracy space location. This method could be supplied as a new one to solve the 3D space location.

In this paper, we analyzed the latest algorithms and technology of multi-band image fusion[6,7], and studied the current stereoscopic display technology [1,4]. While the studying the match of dual-channel, dual-band image, we put forward the idea of dual-channel, dual-band image stereoscopic color fusion. The characteristics fo low-light image and near-infrared image were studied. The probability of low-light image and near-infrared image as stereoscopic image-pair was analyzed, and finally realization of stereoscopic color fusion was introduced.

This paper presents a novel method to reconstruct the internal structures of a mechanical part based on 2D thickness measurement from an Infrared (IR) measurement system. Conventionally, the internal structures are measured by X-Ray imaging techniques but those methods suffer from large measurement errors (higher than 0.125 mm). Using an innovative fixture, this new method first registers the 2D thickness measurement data with a 3D CAD model or a 3D point cloud representing the external feature of the measured part, and then reconstructs the internal features based on the thickness information from IR system. Experimental results shows this new method provides significantly high accuracy compared with X-Ray imaging techniques.

A filter for speckle reduction in SAT image is proposed. On each level of wavelet decomposition, three images are used. One is the original image, and the others are obtained by rotating the original image by 45° and -45° respectively, and so 12 subbands are gotten. In the 12 subbands, four subbands, HL subband and LH subband corresponding to the original image, and two HL subbands corresponding to the second and third image respectively, are used for edge detection, and the LL, HL, LH, HH subbands of the original image are used for synthesis. By using each point's four wavelet coefficients in the four subbands for edge detection, the edge detection property of the point on the original image is captured, and then the edges are detected by setting a proper threshold. And so, the speckle can be reduced while the edges being preserved well by setting the wavelet coefficeints in the synthesis subbands corresponding to the points not on edges to zero but retain the wavelet coefficients in the synthesis subbands corresponding to the points on edges. For detection of some oscillating edges, the filter is improved by combining with the traditional threshold method. Simulations on synthetic images indicate that the new filter performs better than the traditional wavelet domain hard threshold or soft threshold method.

In this paper a practical surface reconstruction algorithm is proposed to efficiently process very large medical dataset in general PC. By considering the conflict between memory consumption and traversal speed, we restrict the traditional surface tracking in single layer and thus get a better trade-off between them. We also use a compression scheme to store the generated mesh, which decrease the memory requirement considerably. For efficient rendering, we employ a triangle strips generation algorithm to decode directly the com-pressed mesh into triangle strip. The experimental results tested on visible man fresh CT dataset show that the proposed algorithm is very efficient in both extracting and rendering phase.

A method is developed for the detection and segmentation of spot targets at sea surface. Firstly, the Sea-Sky-Division-Line (SSDL), close to the horizon, is detected by wavelet-transform to mark out the Target Recognition Region (TPR), which can reduce the target searching range. A Row average grayscale substraction (RAGS) operation is employed to correct the blur caused by the non-linearity distribution of the temperature field. To repress the clutter in the background and increase the SNR of the image, a morphology Top-Hat filter is utilized. Then, the image is opening by selecting a proper structuring element to acquire a few potential target points. Through searching the maximal intensity and determining a threshold, most of the false alarms can be eliminated and the doubtful targets can be segmented. When the SSDL is visible, the real point-target can be retained according to the TPR and the false target can be discarded. Under the conditions of invisibility of SSDL for it is outsdie of the image or it is obscure due to the weather, the segmented target is the real target. The experiment result shows that the method can effectively detect and segment infrared point target in complex sea background.

The paper researched the theory of concept lattice and the algorithms of association rule mining based on concept lattice, introduced the methods into remote sensing image mining, analyzed and discussed the spectrum characteristics mining, texture characteristics mining, shape characteristics mining and spatial distributing laws mining, analyzed the application of remote sensing image mining, such as the automation classification, intelligent retrieval of remote sensing image etc., finally, discussed some research directions.

In staring Infrared Focal Plane Array (IRFPA) imaging system, the spatial frequency of the scene is always more than half of the sampling frequency, thus aliasing formed. Usually, micro-scanning apparatus are used to reduce the aliased signal energy. When micro-scanning, mechanical scan mirror often used to steer the field-of-view (FOV) of the imaging system over a fraction of the pixel distance. Mechanical equipment is usually large, heavy, complex, expensive and especially less reliability. While, liquid crystal can be used to make a non-mechanical light beam steerer for micro-scan. In this paper, we analyzed the infrared spectrum characteristic and the electro-optical reaction of liquid crystal, and introduced the realization of the light beam steerer.

The modulus maxima of a signal's wavelet transform on different levels contain important information of the signal, which can be help to construct wavelet coefficients. A fast algorithm based on Hermite interpolation polynomial for reconstructing signal from its wavelet transform maxima is proposed in this paper. An implementation of this algorithm in medical image enhancement is also discussed. Numerical experiments have shown that compared with the Alternating Projection algorithm proposed by Mallat, this reconstruction algorithm is simpler, more efficient, and at the same time keeps high reconstruction Signal to Noise Ratio. When applied to the image contract enhancement, the computing time of this algorithm is much less compared with the one using Mallat's Alternative Projection, and the results are almost the same, so it is a practical fast reconstruction algorithm.

A set of new invariant moment descriptors - wavelet moment invariants, which combine wavelet multiresolution analysis and moments invariants target recognition method, are proposed in this paper and their invariance also have been proved. Wavelet moment invariants take both advantages of the wavelet inherent property of multiresolution analysis and moment invariants quality of invariant to translation, scaling changes and rotation. Furthermore, studies of the effect of using different wavelet functions and their orders are carried out. Experimental results show that wavelet moment invariants derived from the wavelet function having proper vanishing moments, symmetry and compact support have the best discrimination performance.

Isodyne, as an experimental measurement method, can analyze the inner stresses without destroying the specimen. It is unnecessary to use high-power laser as light source, and the equipments of the experiment are simple. Moreover, the fringe of the pattern is clear and undistorted. Previously, making use of phase shift, phase of Isodyne fringe can be determined through four patterns. In this paper, wavelet-transform is applied to the phase analysis of Isodyne fringe, and all the results are satisfied. With the method of wavelet transform, we can determine the phase of Isodyne fringe automatically and accurately with only a single pattern. Furthermore, all the processing can be programmed, so it is easy to realize automatic analysis.

Triangular Bezier surface is widely used for modelling complex object. However most of geometric modelling systems do not support it. It is necessary to convert it into tensor-product Bezier surface. In this paper, a new conversion algorithm is proposed to convert a triangular Bezier surface into an optimal trimmed tensor-product Bezier surface by using polynomial interpolation. Then the proposed algorithm is compared with previous algorithms in both computational cost and numerical accuracy. The results show that the proposed algorithm has both computational and storage advantages over previous algorithms. Its numerical accuracy is comparable with the previous ones for cases of the degree less than 6.

The embedded zero-tree wavelet algorithm (EZW) is widely adopted to compress wavelet coefficients of images with the property that the bits stream can be truncated and produced anywhere. The lower bit plane of the wavelet coefficents is verified to be less important than the higher bit plane. Therefore it can be truncated and not encoded. Based on experiments, a generalized function, which can provide a glancing guide for EZW encoder to intelligently decide the number of low bit plane to be truncated, is deduced in this paper. In the EZW decoder, a simple method is presented to compensate for the truncated wavelet coefficients, and finally it can surprisingly enhance the quality of reconstructed image and spend scarcely any additional cost at the same time.

In this paper, an efficient VLSI architecture for biorthogonal 9/7 wavelet transform by lifting scheme is presented. The proposed architecture has many advantages including, symmetrical forward and inverse wavelet transform as a result of adopting pipeline parallel technique, as well as area and power efficient because of the decrease in the amount of memory required together with the reduction in the number of read/write accesses on account of using embedded boundary data-extension technique. We have developed a behavioral Verilog HDL model of the proposed architecture, which simulation results match exactly that of the Matlab code simulations. The design has been synthesized into XILINX xcv50e-cs144-8, and the estimated frequency is 100MHz.

In this paper, we propose a technique that combined template matching and support vector machine for road identification from high-resolution aerial image. It is a model-driven approach that combines both the local and global criteria about the radiometry and geometry of linear structures interested. In this approach, the road center point is extracted by utilizing the general road model. Then the road center point is used as initial point for the template matching through which the road segment is obtained. The road characteristic is learned through the support vector machine that is based on the statistical learning theory. The support vector machine is a powerful learning method thatit can get high classification accuracy without too much training sample. These properties can be applied for extracting the road characteristics from few road samples. The support vector machine is used to extract the true road segment and remove the false road segment. The proposed approach has been experimented on high-resolution aerial image and its performance is satisfied.

A new fast fractal encoding algorithm for the processes of searching and matching is proposed in fractal image compression in this paper. The number of domain blocks searched to find the best match for each range block and corresponding encoding time are much reduced by elimination domain blocks not searching using the current minimum distortion and variance difference between the range block and domain block. The algorithm produces a completely identical fractal encoding to that of the conventional full search in reduced time.

We proposed a new line detection method in noisy images using Mexican hat wavelet filters. In our approach, we applied the wavelet transform in a multiresolution sense by forming the products of wavelet coefficients at the different scales to locate and identify lines at different scales. In addition, we also considered shifting line locations through multiple scales for robust line detection in the presence of noise. We found that our approach leads to an effective method to form the basis of a line detection approach.

Relaxation matching is one of the most relevant methods for image matching. The original relaxation matching technique using point patterns is sensitive to distortions such as missing and spurious points and random errors. In this paper, under the condition that the number of spurious points is known, we present an improved point pattern relaxation matching technique which can get better performance than the original one. Experimental results with simulated images are given.

Propose one simple and efficient multi-level thresholding method. Basic dynamic is used to assess the reliability of thresholds. All possible thresholds are detected and sorted by assessment value calculated in water flooding process. Basing on the sorted threshold sequence, when level number changes, thresholds need not be recalculated, and multiple results can be got efficiently. Experimental results are satisfactory.

A new multple description selection/separation method for transmission of video bit stream over wireless channel is proposed in this paper. The method inserts transition frames according to the relative motion between two neighboring frames, and then divided the video sequence into two descriptions with independent prediction loops. The experimental resulst show that the method can help the decorder more quickly recovered from single loss or burst loss compared with previous method, and provides more stable and better quality for the reconstruction of video sequence.

Trademarks' retrieval has obtained more and more attention in recent research on content-based management and utilization of image database system. To retrieve the images, the key is to get the shape features. In this paper, a new method for extracting shape features of trademarks is presented. Based on the theory of information, the method uses images' entropy and invariant moments to capture the shape and spatial information of images. The algorithm is easy and the experimental results show its invariability with respect to translation, scale and rotation of objects. What's more, it also have the noise invariance.

Color is a useful piece of information in computer vision especially for skin detection. In this paper, we propose a novel approach for skin segmentation and facial feature extraction. The proposed skin segmentation is a method for integrating the chrominance components of nonlinear YCrCb color model. The chrominance components of nonlinear YCrCb color space were modeled using a subgaussian probability density function, and then the face skin was segmented based on this function. In order to autheticate the face candidates region, firstly texture information in face candidate regions would be segmented using mean and variance of luminance information, and then eye would be located by the PCA edge direction information, and finally, the others features, such as nose and mouth, also were detected using the geometrical shape information. As all the above-mentioned techniques are simple and efficient, the proposed skin segmentation based on nonlinear color space method is invariably of lighting and pose. In our experiments, the proposed method has been successfully evaluated using two different test datasets. The detection accuracy is around 98%, the average run time ranged from 0.1-0.3 sec per frame.

A hybrid method for image interpolation is proposed. The method consists of three different approaches: Circular arc or B-spline interpolation, linear interpolatino and human visual sensitivity based on interpolation. The image can be divided into three regions: linear smooth region, sharp edge region and human visual insensitive region. The method uses local variance and mean value to find different regions adaptively. The linear interpolation is used for linear smooth region. The human visual sensitivity based interpolation is used for human visual insensitive region and the circular arc or B-spline interpolation is used for sharp edge region. Experiments show that proposed method produces results that are more visually realistic than standard function-fitting methods.

In this paper, an approach of edge detection based-on multifractal is proposed. We apply the 2D wavelet transform modulus maxima (WTMM) method to characterize pointwise Holder regularity and the multifractal spectrum, so edge information can be extracted directly from them. Experiment results demonstrate that multifractal based edge detection has strong flexibility and good detection effect.

China - Japan joint dust project was started in 2001 and carried out a synchronous test to monitor the process of dust storm by using satellite data, to observe dust on sites and to collect total suspend particle (TSP), wind direction, wind intensity by using instruments, Si was tested in laboratory by analysis of collected TSP. LST (Land surface temperature) was retrieved from AVHRR data (96 day/night track imagery data). Resample 1:100,000 scale land use/cover data was used as reference layer during retrieving process. The comparison result of LST and TSP showed that there were good correlations. The result suggested that LST reflected some ground physical feature changes during dust storms and could be used as indicators for predict dust storm.

In this paper, the direct-sequence spread-spectrum technique is introduced to spread watermark signal. Then by utilizing a just noticed difference threshold in spatial domain based on visual masking effect of human visual system, watermarks strength and the embedded locations can be controlled in imagae adaptively. It was shown with experiments that the digital watermark not only can guarantee the transparency, but also has good robustness to JPEG compression, median filter, sub-sampling, etc.

Automated extraction of hierarchical catchments of river networks are fundamental to the automation of flow-routing management in distributed hydrologic models and to the morphometric evaluation of river network structure. An algorithm is proposed for automated extraction of hierarchical catchments from a river network database based on classiciation of river and constrained Delaunay triangulation network in this paper. At first the river network will be ordered by Horton's classification. Then triangulation network of this ordered river network will be constructed. This triangles in the triangulation network can be classified into several types based on their properties. These different types of triangles play an important role in analysis and building hierarchical catchments of river network. The algorithm has been tested in a test dataset.

In this paper, we present a method in the context of pattern characterization. This method is based on the analysis of closed contours of planar objects. The input contour is, first, separated into its x and y coordinates to generate two 1D signals. Both signals are then progressively low-pass filtered with a Gaussian kernel by decreasing the filter bandwidth. The output signals X and Y are then scaled so that the reconstructed contour and the original one can intersect. By doing so, we generate the so called IPM (Intersection Points Map) function that yields interesting attributes for pattern characterisation. The experimental results obtained by applying this method to various contours show that the IPM function is strongly related to the input contour and is rotation and translation invariant. It is also invariant under scale chance for a large range of scales. According to the experimental results, this function appears to be computationally very simple and to provide well-adapted features in the context of pattern recognition.

A new algorithm for image partition using irregular region in fractal image compression is purposed in this paper, which greatly increases the compression ratios achieved over traditional block-based partition. Also, due to the large search space involved (transformations and match), Similar Extension algorithms which are described are used to construct the irregular region transformations, and results for Similar Extension algorithms are shown. The results show that the algorithm of irregular region achieves almost double the compression ratio of simple block-based system at a similar decompressed image quality.

IHS transform was one of typical method for remote sensing data fusion. In recent years, newly developed method that combines advantages of IHS and Wavelet algorithms makes image fusion. In this case after the Wavelet substitution based on pixels or features, and then transforms inversely with IHS in Munsell color space. In this paper we introduce a high frequency substitution method to improve spatial resolutions of imagery. The procedure of the method introduced as flowchart, in which the dot line area is our newly added method. The resolution was greatly improved comparing original image. In cooperating with the demand of on going Minjiang river, Si Chuan, China. A 15m resolution PAN band and 30m resolution 7 bands of ETM data were selected for the method testing, the steps of method test showing in flow chart of this paper. In the future the dots area was our newly developed wavelet high frequency substitute. Improved NDVI imagery raised the quality for monitoring land cover change factor in the project of Return Farmland Back to Forest or Grassland.

A new lossless compression based on neural network is given by establishing special mapping Y, integral function and neural network. A high efficiency image compression based on wavelet and neural network is obtained by embedding in a good wavelet coding system with the new lossless compression. A new image compression based on fractal and neural network is also constructed by embedding in an efficient fractal image compression with the new lossless data compression based on neural network. Experiments show that these compressions are useful and efficient.

The wavelet transform is a powerful tool that cuts up signal or functions into different frequency components, and then studies each component with a resolution matched to its scale. However, how to study these components? This paper addresses the construction of morphological wavelets by combining wavelet with mathematical morphology. First, the multidimensional multi-channel lifting scheme, a general framework of multidensional morphological wavelet construction is presented. Then one-dimensional and multi-dimensional multi-channel median morphological wavelets are constructed wtih median operator.

This paper proposes an approach based on using lifting scheme to construct integer wavelet transform whose purpose is to realize the lossless compression of images. Then researches on application of medical image, software simulation of corresponding algorithm and experiment result are presented in this paper. Experiment shows that this method could improve the compression ration and resolution.

One common task of image interpolation is to enhance the resolution of the image, which means to magnify the image without loss in its clarity. Traditional methods often assume that the original images are smooth enough so as to possess continues derivatives, which tend to blur the edges of the interpolated image. A novel fast image interpolation algorithm based on wavelet transform and multi-resolution analysis is proposed in this paper. It uses interpolation and extrapolation polynomial to estimate the higher resolution informatoin of the image and generate a new sub-band of wavelet transform coefficients to get processed image with shaper edges and preserved singularities.

In this paper, a wavelet-based fractal image coding algorithm is proposed. The conventional fractal image coding in spatial domain is extended to wavelet domain by taking advantage of the self-similarities among different wavelet subtrees through proper affine transformation. This method is based on the combination of the theory of multi-resolution analysis with iterated function systems by introducing some effective block-classification schemes. The original image is first transformed into wavelet domain in which fractal compression and arithmetic coding are performed. By classifying D blocks and R blocks set in this domain, the approach can significantly reduce the computation complexity and encoding time. Meanwhile, the hybrid image compression algorithm obtains much better coding performance in terms of PSNR with error modification. This is the main advantage of this method. A set of experiments and simulations show the potentials of using these classification techniques in wavelet domain for futher improvements.

In this paper, we set forth the principle of Cosine Backscatter Model. In the model, and a new algorithm that doesn't omit azimuth angle and can extract DEM in mountainous area was introduced. First, the Radar image is divided into several regions by edge information using Lapalce algorithm. In one region, the image gray level changes slowly. Second, in the same region, we could assume that slope changes slowly, azimuth angle and range angle are affected by their neighbor pixels, the image gray level of pixel is changed by its neighbor pixels, azimuth angle and range angle were assessed from a seed. From known point, we get azimuth angle and range angle respectively by derivative; balance the value through iterative computation by ratio data and Cosine Backscatter Model. In neighbor regions, we get seed of gradient angle by average gray level of two regions and give amend index. From this point, we can get other point gradient angle same as the second step. Then we extract DEM in all regions. By applying this model, the DEM of Zhangbei of Hebei province were assessed. Through checking against the topographic map, the DEM error is little.

An endoscopic image retrieval system based on color clustering method has been presented in this paper. To reduce the color sensitivity to noise and the color histogram dimension and to enhance the accuracy and speed of retrieval, HSV color space is employed in this system and each Hue, Saturation and Value (Intensity) component have been quantified into 6, 8, 4 levels, respectively, because endoscopic images generally contain only a few of dominant colors, such as red, yellow or purple and HSV color space is most approximate to human perception, so the whole HSV space is divided into 192 (6x8x4) subspaces and each subspace is clustered as an index. So a color histogram with 256-dimension is used as indexing and the histogram similarity measure is also given at the same time. The algorithm has been successfully adopted by our endoscopic image retrieval system and the experiment with a database about 1000 clinical endoscopic images has demonstrated its effectiveness and rationality.

In this paper some properties of Foley-Sammon optimal discriminant vector (FSODV), by contrast with uncorrelated optimal discriminant vector (UODV), are discussed. Firstly the Fisher ratio of every FSODV must be not less than that of corresponding UODV and consequently sole FSODV will be superior to corresponding UODV. Secondly the correlation between feature components extracted by FSODV is an important factor. If high correlation is available between most of the feature components, the classification performance of FSODV will be remarkably inferior to UODV. However, if most of the feature components are only little correlative to each other, FSODV is comparative to UODV in classification.

A dynamical multi-objective evolutionary algorithm (DMOEA) is proposed. It is the first study of the dynamical evolutionary algorithm (DEA) in multi-objective optimization process. All individuals called as particles in a population evolve through a new selection mechanism. We combine the selection mechanism in DEA and the elitists strategy in existing evolutionary multi-objective optimization algorithms in DMOEA. The performance of DMOEA has been analyzed in comparison with SPEA2. The experimental results show that DMOEA clearly outperforms SPEA2 for the whole benchmark set. Moreover, a better convergence is sometimes observed in DMOEA for some functions of the benchmark set. The numerical experiment results demonstrate that the proposed method can rapidly converge to the Pareto optimal front and spread widely along the front.

In this paper, we propose a robust approach for object tracking in infrared imagery. Our method mainly applies the image intensity histogram distribution and intensity projection distributions and computes a likelihood measure between the candidate and the model distributions by evaluating the Mean Shift Vector. In addition, Gabor filters are applied here to enhance the contrast of the object with the background, and then the scale of the track window can be selected according to the variable object size. Our method greatly improves the accuracy of object tracking and can update the model frame by frame, which means the object model does not necessarily depend on that of the first frame. The robustness of our method is supported by several different infrared imagery sequences.

When compared with speech technologies in speech processing, automatic language identification is a relatively new yet difficult problem. In this paper, a language identification algorithm is provided and some experiments are conducted using OGI multi-language telephone speech corpus (OGI-TS). Then experiments results are described. It is shown that GMM-UBM is another efficient method to language identification problems.

Virtual endoscopy is meaningful for medical diagnosis and surgery. In this paper, a system framework for virtual endoscopy is proposed including automatic centerline extraction and view-dependent level-of-detail rendering techniques. Combining Hessian Matrix with distance mapping, our path planning method can generate accurate skeleton for virtual navigation. Furthermore real tim rendering can be achieved with our new view-dependent subdivision algorithm. The experimental results show the efficiency of our methods.

This paper describes the problem of labeling and completing an imperfect line drawing. Almost all of techniques about shape from contour require a perfect line drawing as their input. Experience indicates, however, that lines are often missing. We exhaustively studied all possible configurations of the imperfect line drawing and found that it is closely related to L-junction. W and Y-junctions in the imperfect line drawings are the same as they are in a perfect line drawing, L-junctions, however, are different because they could be degenerated from W or Y ones. In this paper, it is shown that the number of L-junction in the imperfect line drawing is 36. The 36 L-junctions and their corresponding W or Y ones from which they are degenerated are illustrated. We show how to utilize the line labeling and junction to predict and complete missing line.

In this paper, we proposed a new object-based coding algorithm by using wavelet transform to instead of the image encoder algorithm by using FGS in MPEG-4. The new object-based coding algorithm combines motion estimation with object-based 3-D wavelet transform for video coding in order to fully utilize the redundancy in the time domain. The shape-adaptive algorithm based on modifying boundary extension method of lifting scheme. A sequence of VOPs are fed into the motion compensated lifting (MCLIFT) wavelet coder which first decomposes the VOPs temporarily through MCLIFT filter, and then decompresses the VOPs spatially by shape adaptive lifting wavelet transform (SA-TWT). We encode the video and represent the stream as multilayer bit stream. The integrated transport-decoder buffer ensure the video be continuously transmitted. Losing package can be recovered by using re-transmission.

The problem of calculating the discrete Fourier tranform (DFT) acquired in polar coordinate system has been given considerably attention in many fields such as antenna, image registration and tomography. This paper proposes an improved fast DPFT algorithm aiming at 2D real data. In this paper, a Conjugated-like property of the conjugated sequences' Chirp-Z transform (CZT) in symmetric frequency section is proved which saves half of the computational complexity in CZT. The algorithm is suitable for real-time applications by only 1D calcuations in which the most steps are 1D FFT. The experimental results show the applicability and good performance of this approach.

Interfacial Fracture Mechanics is the problem which attracted researchers all over the world as the strength of the composite structure are depended on the mechanical behavior of the interfacial fracture. In the paper, the stress field and stress intensity factor of a bi-material beam with crack is obtained by model with initial carrier fringes. In order to obtaining phase value of which is related to the stresses, the Fourier Transform method and frequency shift are applied. It is shown that, using this method, the research of interfacial crack can be more simple, efficient and highly accurate. This technique is very significance for the local three-dimensional effects in dynamic problems of interfacial fracture mechanics.

A new reconstruction algorithm of computer tomography (CT) from a few views based on a neural network of Gaussian Machine (GM) is presented. The problem of image reconstruction is formulated as optimization under the criterion of maximum entropy, and a GM is then constructed to solve the optimization problem using simulated annealing technique with hyperbolic temperature adjustment. We demonstrate both the Simultaneous Algebraic Reconstruction Technique (SART) reconstruction of this image and the GM reconstruction using the same measured input data. The effect of noise in the projection data, projection angles and sample intervals are addressed. The results of numerical simulation show that this technique using the projection data obtained from four views with the projection angles 45°apart has fairly high accuracy (the average relative error is 0.03%) and good stability against noise.

The purpose of this paper is to describe a hardware model that can recognize Jawi handwriting manuscript via chain code technique. The model is divided into three modules: character segmentation, image processing (image enhancement, noise reduction, character recognition) and character id searching (via chain code). In the next stage, this model will be implemented using VHSIC hardware description language (VHDL).

While carrying out Optical Chinese Character Recognition, distinguishing the font between printed and handwritten characters at the early phase is necessary, because there is so much difference between the methods on recognizing these two types of characters. In this paper, we proposed a good method on how to banish seals and its relative standards that can judge whether they should be banished. Meanwhile, an approach on clearing up scattered noise shivers after image segmentation is presented. Four sets of classifying features that show discrimination between printed and handwritten characters are well adopted. The proposed approach was applied to an automatic check processing system and tested on about 9031 checks. The recognition rate is more than 99.5%.

The objective of this paper is to develop a rapid, objective, and easy method for recognizing wheat varieties, which is important for breeding, milling and marketing. The method can be used in place of the existing procedures to remove subjectivity from wheat variety recognition. In contrast to previous work, most of which has focused on wheat morphological characteristics, the features utilized in this paper are based mainly on kernel color. Varietal classification is performed by using Support Vector Machines (SVMs) method. More than 96% correct recognition rates are achieved with bulk samples involving 16 varieties representing a wide range of wheat varieties, wheat class, and kernel types. The proportion of single wheat kernels correctly recognized ranges from 87% to 93%. The results were encouraging since the method proposed here can be easily conducted in routine inspection.

Nowadays in intelligent transportation systems (ITS), information gathering depends heavily on visual information. Image processing technologies (IPT) play a key role. After a brief introduction of ITS, IPT is illustrated from three aspects: image sensor, image processing methods and image processing system. Among many applications for image processing in ITS, the paper presents a roadside example, licence plate recognition (LPR). Attention is centered around two aspects of LPR: plate character isolation and plate character recognition. Lastly, the paper indicates the trends of image-processing technologies in ITS.

The anisotropic reflectance of vegetation canopy is mainly determined by its spectral and structural features, and can be described by Bidirectional Reflectance Distribution Function (BRDF). In this article, we select the winter wheat from the beginning of April to the beginning of May 2001 at Shunyi county, north of Beijing, as the research object, to study its BRDF changing rule with the changing time. In the process we compute the structural scattering index (SSI) by inverting the semiempirical linear kernel-driven BRDF model, and analyze its relation with the leaf area index (LAI) of winter wheat. The results show that there is a clear linear relationship between SSI and LAI of winter wheat. So SSI can well be used to reflect the seasonal BRDF changing rule of winter wheat.

This paper presents a novel digital image watermarking scheme that is invariant to rotation, scaling, and translation (RST). We embed watermark in the log-polar mappings of the Fourier magnitude spectrum of an original image, and use the phase information of the original image to rectify the watermark positions. The scheme avoids computing inverse log-polar mapping (ILPM) to preserve image quality and avoid exhaustive search to save computation time and reduce false detection rate.

Observation by limited field observational stations is the major conventional method of research on snow and relevant problem, such as flood caused by melting snow. However, observation on only several ground observatories cannot provide enough information for large scale region accurately and timely. The advanced technology of remote sensing and geographic information system (GIS) is an effective tool to extract snow information and monitor snow change quickly and dynamically. This paper discusses the method of snow mapping and establishing dynamic snow monitoring information system by using multisensor, multispectral and multitemporal remote sensing data (NOAA/AVHRR, satellite borne SAR and TM).The study results show that the use of multisensor data and technique of GIS, combined with relative contemporaneous field observational data, enables the snow monitoring more rapid and accurate.

This paper addresses two problems of a ship handling simulator. Firstly, 360 scene generation, especially 3D dynamic sea wave modeling, is described. Secondly, a multi-computer complementation of ship handling simulator. This paper also gives the experimental results of the proposed ship handling simulator.

With the rapid globalization of market and business, E-trading affects every manufacture enterprise. However, the security of network manufacturing products of transmission on Internet is very important. In this paper we discussed the protocol of fair exchange and platform for network manufacture products E-trading based on fair exchange protocol and digital watermarking techniques. The platform realized reliable and copyright protection.

One important step in map vectorization is separation of geograhical information in a cartographic map. Such a fundamental task is not only time-consuming but also laborious. To get an overall understanding of this task and explain why it's hard to achieve a good result, a summary about the characteristics of color map segmentation is presented first in this paper. Then a new algorithm, featuring practicability and adaptability to the variation in brightness and contrast of images, is proposed directly based on RGB color model. Meanwhile, structure features are also used to improve the separation result by connecting broken lines. Experiments on many real map images prove that the algorithm realizes automatic segmentation of color maps and produces a fine result which can be used in automatic data collection without much further processing.

This paper introduces an automatic real-time gender classification system. The system consists of mainly three modules, face detection, normalization and gender classification. The LUT-type weak classifier based on Adaboost learning method is proposed for training both face detector and gender classifier, and a Simple Direct Appearance Model (SDAM) based method is developed to detect the facial landmark points for face normalization. This results in an integrated system with rather good performance. Experiment results on both pictures from World Wide Web and real-time video clips are reported to demonstrate its effectiveness and robustness.

Face technologies which can be applied to access control and surveillance, are essential to intelligent vision-based human computer interaction. The research efforts in this field include face detecting, face recognition, face retrieval, etc. However, these tasks are challenging because of variability in view point, lighting, pose and expression of human faces. The ideal face representation should consider the variability so as to we can develop robust algorithms for our applications. Independent Component Analysis (ICA) as an unsupervised learning technique has been used to find such a representation and obtained good performances in some applications. In the first part of this paper, we depict the models of ICA and its extensions: Independent Subspace Analysis (ISA) and Topographic ICA (TICA).Then we summaraize the process in the applications of ICA and its extension in Face images. At last we propose a promising direction for future research.

Artifical Neural Networks (ANN) has many good qualities comparing with ordinary methods in Land Suitability Evaluation. Based on analysis of ordinary methods' limitations,s ome sticking points of BP model of ANN used in land evaluation are discussed in detail, such as network structure, learning algorithm, etc. The land evaluation of Qionghai city is used as a case study, we know that ANN always can give more reasonable evaluation results from test.

We describe the principles of building a moving vision platform (a Rig) that once calibrated can thereon self-adjust to changes in its internal configuration and maintain an Euclidean representation of the 3D world using only projective measurements. The calibration paradigm is termed "Omni-Rig". We assume that after calibration the cameras may change critical elements of their configuration, including internal parameters and rotations. Theoretically we show that knowing only the relative positions between a set of cameras is sufficient for Euclidean calibration even varying focal length and unknown rotations. No other information of the world is required.

This paper discusses stereo photogrammetry analytic principle of the binocular sequence images and deduces the formula of the movement parameters estimate model. An aberrance correction model and sensors 3D spatial relationship calibration method is proposed. On this foundation, the common principle, calculation model and implement preceding and methods of the binocular sequence images aided by GPS/INS navigation are summarized. A method that used for positioning and orientation by GPS/INS assisted by motion analysis is proposed. Based on case of rapid scatter when GPS is lost, this method used the constraint offered by relative position and attitude from motion analysis to improve precision of position and navigatoin and constrain the scatter process. The experiment results of the vehicle navigatoin in GPS blocking case show the high navigation precision wiht the technique of the binocular sequence images aided GPS/INS navigation.

An algorithm to retrieve structure from long image sequence captured by a hand-held camera is proposed. Firstly, the long image sequence is divided into several subsets. Each subset has common feature points. Secondly, Euclidean reconstruction is obtained by factorization with all of these points visible in each image of a certain subset. Then results coming from different subset are brought into a common coordinate frame by the similarity transformations. Finally, global optimization is applied to refine the data and produce a jointly optimal 3D structure. A significant merit of the algorithm is that it can deal with the long image sequences with occlusions. The algorithm has been tested on real images with satisfactory results.

Morphological pattern spectrum is a useful shape description tool for quantifying the geometric shape feature of both binary and gray images. In this paper, a general frame of pattern spectrum is developed for both continuous-scale and discrete-scale based on the efficient and reduced redundancy multiscale image representation. A discussion for the basic properties of generalized pattern spectrum is presented in the paper. Algorithms for shape recognition and shape classification using continuous and discrete-scale pattern of images are proposed in Euclidian space.

In this paper, we address the problem of semantically generating hierarchical and meaningful content for soccer video by mapping low-level features to high-level semantics. Our goal is to construct a hierarchical and compact content abstraction of soccer video that can serve as an effective index table, allowing users to browse through lots of soccer videos in a flexible and efficient way. And we generated three-layer semantic hierarchies of soccer video according to characteristics of soccer video through bridging the gap between features and semantics. Some experimental results are presented and discussed in the paper.

SScalable reduced dimension face object segmentation and tracking (SRDOST) based on wavelet is presented in this paper. SRDOST algorithm is taken advantage of the characteristic of wavelet coefficeints multiresolution in the same direction, which makes SRDOST be applied to detect and track the video object of a reduced dimension image with much lower complexity and more sufficient accuracy. The number of image data at the lowest frequency subband is about one of (2^level)² to that of the original image so that the detection complexity at the lowest frequency subband may reduce greatly. It is important that SRDOST may be a multiresolution object segmentation algorithm based on wavelet transform, which may bring a family of video object sequence (VOS) with different resolutions. So SRDOST is a low complexity and efficient object segmentation algorithm. The proposed algorithm is to be integrated with our video object based wavelet color video coding with motion compensation algorithm.

An automatic SAR and optical image registration approach based on linear features and neural network is proposed. First, fuzzy linear feature extraction algorithm is used and common straight line segments between SAR and optical images are kept for matching primitives. Then discrete relaxation method is adopted to get acceptable matched primitives of two images and the crossing points of these matched line segments are taken as control points of image registration. Lastly, neural network is employed to realize theimage transformation and resampling. The experimental results are given and show that the proposed image registration approach can resolve the registration of SAR and optical images including long and thin objects effectively.

Face alignment is very important in face recognition, modeling and synthesis. Many approaches have been developed for this purpose, such as ASM, AAM, DAM and TC-ASM. After a brief review of all those methods, it is pointed out that these approaches all require a manual initialization to the positions of the landmarks and are very sensitive to it, and despite of all those devoted works the outline of a human face remains a difficult task to be localized precisely. In this paper, a two-stage method to achieve frontal face alignment fully automatically is introduced. The first stage is landmarks' initialization called coarse face alignment. In this stage, after a face is detected by an Adaboost cascade face detector, we use Simple Direct Appearance Model (SDAM) to locate a few key points of human face from the texture according which all the initial landmarks are setup as the coarse alignment. The second stage is fine face alignment that uses a variant of AAM method in which shape variation is predicted from texture reconstruction error together with an embedded ASM refinement for the outline landmarks of the face to achieve the fine alignment. Experiments on a face database of 500 people show that this method is very effective for practical applications.

Optical Flow computing doesn't require the rigorous corresponding relationship among features of sequential images, so this approach is widely used in computer vision field including detection and dynamic analysis of moving objects. But it is rarely used in infrared images because of the high noise levels of images. This article proposes a moving object pre-detection algorithm based on supervised learning, image pair difference significance test and minimum cost Bayes rule. This algorithm can not only efficiently be applied in indicating moving objects in infrared image sequences, but also in optical flow computing and behavior analysis of the moving objects.

This paper presents a novel parallel hardware architecture for MPEG-4 zerotree encoder. Under the architecture, a parallel processing of multi bit-planes is fulfilled through a preprocess until and multi-encoding units. The preprocess unit consists of mainly a bit-not-and and a bit-or logic circuits. It ensures sufficiently that efficient encoding in each bit-plane is performed independently. Each encoding until uses a fast technique to assign symbols by taking advantage of MPEG-4 zerotree coding symbol alphabet, and to select valid data to output using a ZTR address buffer.

Texture synthesis has a variety of applications in image processing. New algorithms emerged endlessly. Inspired by brushwork, we presented a novel algorithm for synthesizing textures from an input sample. First, EMD algorithm was introduced and texture structure of sample was extracted. Second, we synthesized texture structure with Patch-based sampling and MRF. For the spaces among structures, we extracted their irregular forms with distance transform and filled in them. Our method is not only simple and good qualitative but also robust.

The Wavelet-Domain Projection Pursuit Learning Network (WDPPLN) is proposed for resolving the difficult task that restoring image, which is blurred by multisource degraded factors image. The new approach combines the advantages of both the projection pursuit and the wavelet shrinkage technique. By separately processing wavelet coefficients and scale coefficients, the WDPPLN resolves the problem of restoring image very well, when little or not a prior information about the degradation is available. The WDPPLN estimates the degraded factor, which blurred the image, using Projection Pursuit Learning Network (PPLN). Also, it suppresses the noise using the soft-threshold of the wavelet shrinkage technique. The new method is compared with the traditional methods and the PPLN method in visual effect and objective evaluation criterion. Experimental results show that it is an effective method for restoring multisource degraded image.

Object-based segmentation of image sequences is one of the issues often arise in the world of video processing and communications. In this paper, a robust semiautomatic video object segmentation scheme is proposed. To facilitate users defining the initial object contour efficiently and accurately, an improved intelligent scissors is proposed by trading off the accuracy of original intelligent scissors and the simplicity of bounding box. To avoid the accumulated errors during object tracking, video sequence is firstly decomposed into video clips according to the rigidity of video object and the motion complexity. Then a snake-based bi-directional tracking is utilized to interpolate the video object planes (VOPs) of successive frames. Experimental results demonstrate that it can achieve better spatial accuracy and temporal coherency than COST211 AM, with about 10-22% improvement of spatial accuracy and almost the same temporal coherency.

A new algorithm for segmenting color colonscopic images by fusing color, brightness, spatial distance and texture information is presented in this paper. It makes the fractal dimension (FD) as the measurement for texture feature in images and applies a stochastic clustering algorithm that uses pairwise similarity of elements. The clustering algorithm that is based on a new graph theoretical algorithm for the sampling of cuts in graphs, can obtain the optimal number of clusters automatically. The complexity of our method is lower, and its stochastic nature makes it robust against noise. More than 40 colonscopic images have been used to demonstrate the effectiveness of this new algorithm.

Image segmentation is one of the most challenging problems in image processing. While significant progress has been made in gray-scale texture segmentation and color segmentation problem separately, the combined color and texture segmentation problem is less considered. In this paper, we use independent component analysis to extract local color and texture features for segmentation. Experiments compared with gray-scale texture analysis method show that the proposed method is more effective in segmenting complex color and texture images.

In this paper, an approach for the automatic extraction of linear feature, in particular roads, from digital aerial imagery is proposed. In some literature, knowledge based automatic road extraction were done with geo-referenced imagery which can automatically register old road map to new imagery as knowledge. Whereas the automatic geo-reference and road extraction are processed simultaneously in this approach, which can benefit and depend on each other. The implemented approach is based on Snake model and template matching with the new aerial imagery and old road map. The presented procedure does not need much manual interaction and therefore has the potential to be integrated into an automatic workflow. Potential applications of the approach are manifold, like automatic change detection of road and three-dimensional reconstruct of man-made objects such as road and building wtih some minor modifications.

This paper presents a texture segmentation approach based on Gauss-Markov random field(GMRF) model and multi-directional mosaics. Image texture is modeled by the second order GMRF model and the least error estimation is employed for the solution of model parameters. In order to improve the segmentation accuracy of uncertain area in boundary region between different textures, we introduced Laws energy masks and directional mosaics to obtain energy and orientation feature. And Euclidean distance approach is employed to classify different features. Experiments show that accuracy of texture segmentation can be improved.

Road extracted from satellite imagery have been used for many different purposes, e.g. military, map publishing, transportation, and car navigations, etc. Many method such as, neural network, Knowledge-based, Optimal search, Snake model, Semantic model, Road operator model, etc. was researched to identify road from satellite image, but because of complicated characteristics of road and image itself, and automated road network extraction still remains a challenge problem, and no existing software is able to perform the task reliably. This paper presents a hybrid method which combines Fuzzy-C-Means with back-propagation neural network and knowledge processing technique to detect roads in SPOT image. The basic idea of the paper is "easiest first" principal, and firstly focus to extract local salient road segments most easily and reliably, then use contextual knowledge and supervised back-propagation neural network model to extract fuzzy road segments among salient road segment, and then grouping these extracted pixel as seed point, candidate point, and not-road point, and then according to appropriate knowledge rule to traversal and join, guide the further road link in the whole image. At last, some post-processing steps are taken to refine the result. The resultant image shows this hybrid identification method performs better than only using knowledge-based method or neural network techniques.

The main characters of color topographic map are analyzed in this paper. A feedforward neural network is constructed and a heuristic learning algorithm is proposed to provide significant speedup and extraction of color from color topographic map. A new method of combining neural network with statistic techniques is given to make the algorithm of color map segmentation more effective and practical.

A new method of minimal fuzzy entropy segmentation is introduced. It adopts a new membership function for the consistency and concentricity in the object and its background. A new 2D fuzzy entropy thresholding method is also developed, which is based on 2D gray historgram. The gray values of every pixel and its neighboring region are used in this 2D method. The experimental results show that the minimal fuzzy entropy method is very useful in the segmentation of some images and the 2D method has a good performance of resisting noise and good robustness. The segmentatiaon of using 2D is much better than 1D for most images, and the new method can be easily extended to other 1D entropy imaging thresholding.

A novel unsupervised classification scheme called spatial fuzzy C-means clustering is proposed in this article. Based on conventional fuzzy C-means algorithm, our scheme takes spatial homogeneity into consideration by introducing spatial membership and applying SMNF, thus improved robustness against noises or outliers. Preliminary experimental results are also shown to demonstrate effectiveness of our method.

Image spectra calibration is of great importance for further processing and feature extraction. In this paper, an automated flat field reflectance calibration algorithm (AFFT) is proposed. This algorithm is an improvement to the traditional flat field transformation calibration. It is based on the fact that the so-called flat field is a flat block of high brightness and relative flat spectral response, and at a certain wavelength range (.e.g. 500-700nm) the brightness or radiance of the flat field is a certain multiple of the average spectrum of the image. Because the average image spectrum spectrum usuall is relatively flat, so a certain multiple of the average spectrum can be regarded as the criterion (or threshold) to select flat field pixels. So such parameters as wavelength range, multiple increment between flat field and the average image spectrum and number of the largest area block are set to determine the useful flat field so that an average spectrum of the flat field is obtained. By using this flat field spectrum as solar/atmospheric response, hyperspectral image can be calibrated to reflectance image. In the end, AFFT was validated by one PHI image acquired in Japan, 2000. It turns out that AFFT is effective to search all the flat fields which meet the fixed terms automatically and promptly, the spectra transformed by this method are much smoother and reliable to some extent.

These fusion methods such as IHS transform, Brovey transform and principal components transform could merged two optical image data of different resolutions - a high spatial resolution panchromatic image and a low spatial resolution multi-spectral image. But these fusion methods required the spectral range of the high spatial resolution panchromatic image equals or approximates to the spectral range covered with the multi-spectral image. This paper brings forward a new fusion method called FM that could merge two optical image data of different spectral range. This paper proposed its algorithm, firstly to filter on the panchromatic image, then to merge the remote sensing data applying algebra ratio. The fused production is more excellent at spectral preservation.

In this paper, a system for the segmentation and classification of the skewed document images with graph regions is proposed. In this system, the skewed angles of the document images are detected with a novel algorithm based on the morphological operation of Hit-or-Miss and the Hierarchical Hough transformation. To make the system valid for document images with graph regions, we proposed to introduce a middle point cut process to the traditional recursive X-Y cuts (RXYC) segmentation algorithm so that the graph regions can be approximated with a lot of small rectangles. The segmented regions are classified by two features of BWR and CC, which represent respectively the black to white pixel ratio and the cross-correlation between pixels of the sub-blocks. Experimental results have proved the fastness and the reliability of the system proposed in this paper.

In this paper a FLIR image segmentation algorithm based on genetic algorithm and fuzzy set theory was presented. Image processing has to deal with many ambigious situations. Fuzzy set theory is a useful mathematical tool for handling the ambiguity or uncertainty. A fuzzy entropy is a functional on fuzzy sets that becomes smaller when the sharpness of its argument fuzzy set is improved. The paper defined different member function for the object and background of the image to transform the image into fuzzy domain and chose Z-function and S-function as the membership functions for the object and background of the image respectively and threshold the image into the object and background by maximizing the fuzzy entropy. The procedure for finding combination of a, b and c is implemented by genetic algorithm with appropriate coding method to avoid useless chromosomes. The experiment results show that our proposed method gives better performance than other general methods with good real-time by using genetic algorithm.

With the development of modern science and techology, MEMS becomes an important branch. The micro operating system becomes an interested spot. During the micromanipulation process, observing the micro components by optical microscope is a crucial technology. Limited by the optical parameters, focus of the optical microscope is small. For example, focus of 10^x object lens is about 10 micron. The observation of some bigger micro objects, which size is tens or hundreds of times of 10 micron, are certainly impossibe by one time imaging. Some researchers had tried to extend the focus by improving the structure of microscopy, but the results are not satisfying. The optical microscope has CCD sensor as detector. Moving the object carrier, series adjusted focus images can be given. As the distance between CCD sensor and object lens is fixed, these images are with the same amplification ration. We can use computer to analysis these images for extending the focus. Through series images to extend focus, core of this method is analyzing and processing these series images, and at last composing one image, which is clear at each vertical depth. On this image, the position of each micro object can be measured easily. Sub-pixel processing technique makes the measure precision achieve micron degree. The distance, which is recorded while adjusting the object carrier, can help to locate the vertical position of micro object, experiments show that the locating precision could up to micron degree also. Using this method avoids changing optical system hardware, and is easy achieved. Clear image can be got in the adjustable range of object carrier. The range of focus is extended. The precision can be up to micron degree on 3D direction. So the method is useful on observing and measuring of micro object, has theoretical and practical value.

In this paper, a new fault diagnosis approach for the photovoltaic array, which is based on infrared and visible image fusion technique, is proposed. Firstly, the temperature difference and infrared characteristics are analyzed, and then the features of both infrared image and visible image are extracted. By comparing the features of infrared image with those of visible image, the abnormal operating regions covered with something are distinguished. A fuzzy fault diagnosis approach is introduced and implemented for other regions detected in infrared image but none in visible image. Experimental results show that the proposed approach is feasible and effective.

This paper discusses the existing three optimal band combination rules of hyperspectral remote sensing images. They are joint entropy, optimal index factor and Sheffield index respectively. Three bands of MODIS images data are combined arbitrarily according to the three rules, so the best three bands combination images of the three rules are acquired. On the basis of this, the three images are all classified in term of maximum likelihood classifier. Also, the influence of each band combination to the classification performance is discussed. The experiment result proves that the best classification performance of the MODIS images based on the three bands combination is the combination image based on optimal index factor.