Radiation calibration is the core issue of quantitative remote sensing. Polarization spectrum detection can characterize fine structure. In order to improve the accuracy of remote sensing under outdoor lighting conditions, the multi-angle polarized hyperspectral images of the jujube canopy were obtained, and the quality distribution characteristics of the jujube canopy were analyzed by extracting multi-dimensional information features such as angle, polarization and spectrum from hyperspectral images. Secondly, the normalized vegetation index NDVI, With the polarization parameter such as the dolp (degree of linear polarization) and Orient to obtain the polarization parameter images of jujube. To get the other targets with obvious features and clear texture in details. Finally, by performing multi-band fitting and related processing on the hyperspectral characterizing the water content and other quality information of the jujube, a polarized hyperspectral quantitative remote sensing model was established to obtain grayscale images that characterize the spatial distribution of the water content and other qualities. This provides an important reference for the development of digital intelligent agriculture.
The composition and structure of fruit and other natural products are complex. Due to the influence of environmental factors, it is urgent to combine quantitative detection with remote sensing technology to quickly obtain the quality distribution of jujube in large area of jujube orchard. In order to improve the accuracy and efficiency of the outdoor near-surface quality detection model. The jujube is equivalent to a scattering medium with random refractive index distribution. Biological tissue optical parameters were used to describe the quality changes of jujube in different maturity stages. Through simulating different scattering conditions (particle size, the refractive index) light intensity distribution and the change law of polarization, with the hyperspectral polarization experiments of jujube in indoor and outdoor, Through Principal component analysis(PCA), Minimum Noise Fraction (MNF) reduces the dimension of the hyperspectral imageries, we compared the results and found that the polarization direction in principal component characteristics and minimum noise distribution have obvious difference, the polarization dimension difference between high_dimensional information was expressed by the noise distribution, different characteristics through the dimension of the polarization noise distribution. In the high_dimensional space. The jujubes and the leafs of canopy have obvious differences in P0_MNF14 and P45_MNF13.Jujube can be separated from the complex background. The accuracy and efficiency of near_ground remote sensing for the quality of jujube can be improved by extracting multi_dimensional characteristic information of hyperspectral polarization.
We acquired polarized reflectance images and Mueller matrix of fresh bovine skeletal muscle. Using
polarization-dependent Monte Carlo simulations based on a sphere-cylinder scattering model, we are able to reproduce
the characteristic features in the experiment results. We also simulate the changes of reflectance profile during stretching
and rigor process, which are regarded as the changes of cylinders' diameter and the cylinder-sphere ratio in our model.
The good agreement between simulations and experiments indicates that the unique pattern of polarized reflectance of
skeletal muscles can also be due to scattering of well aligned fibrous myofibrils rather than coherent diffraction on the
sarcomeres. It provides another angle to understand the interaction between photons and skeletal muscle and a proper
model which characterizes the microstructure of the skeletal muscle. In addition, we give a parameter K calculated from
the M12 element of Mueller matrix. The K-value is sensitive to different parameters in sphere-cylinder scattering model,
therefore it is expected to use for monitoring the states of the skeletal muscle.
The scattered light of tissues provides abundant information about the tissues properties. In this paper, light propagation
in anisotropic scattering medium was investigated experimentally and theoretically. To study the influence of fibrous
structure on the propagation of polarized light in anisotropic medium, the transmitted light from a section of dentin was
measured. The measured polarization property of the scattered light was related to the polarization direction of the
incident light. Cylindrical scatterer was utilized to model the scattering of microstructure in dentin. The experimental
results are compared with the simulation results. The results demonstrated that the microstructure in anisotropic medium
has effect on both propagation direction and polarization of scattered light. Understanding the effects of microscopic
structure on the polarized light scattering will aid to develop polarization dependent optical detection methods in
anisotropic medium.
Polarized light has been increasingly used in biomedical imaging to study the optical properties of biological tissues or
enhance the imaging contrast by eliminating the scattered light. In this report, we combine polarization gating and
Fourier gating to suppress interference by the diffusive photons and improve the quality of projection images. A Monte
Carlo simulation is utilized to study the propagation of different polarized light through turbid media. Polarization of a
photon is represented by a Stokes vector and the scattering matrix is calculated from Mie theory. By tracing the trajectory
and the polarization of the photons, spatial distribution and polarization of photons transmitted through a spatial filter
aperture are simulated. It is shown that polarization gating and Fourier gating can effectively reject the multiple scattered
photons and improve the contrasts of the images. Differences between linearly and circularly polarized lights for
scatterers of different size are compared. However, for large particles, effects of both gating techniques are limited.
We have developed a novel method for imaging the fluorescence intensity and anisotropy by two-photon fluorescence
microscopy and tested its capability in biological application. This method is applied to model sample including FITC and
FITC-CD44 antibody solution and also FITC-CD44 stained cells. The fluorescence anisotropy (FA) of FITC-CD44ab
solution is higher than the FITC solution with the same concentration. The fluorescence in cell sample has even higher FA
than in solution because the rotation diffusion is restrained in membrane. The method is employed to study the effect of
berberine a kind of Chinese medicine, on tumor metastasis. The results indicated that tumor cell membrane fluidity is
decreasing with increasing the concentration of berberine in culture medium.
A kind of novel power splitter built with two-dimensional photonic crystals based on directional coupling is proposed. Different output power levels are achieved by changing the coupling length. The distribution of light intensity in the coupling waveguides is investigated and the dependence of transmission on coupling length is provided. A good agreement between the theoretical and experimental output transmissions is shown. With the low-loss bends, a total transmission up to ~0.96 is achieved. The power in each branch can be easily further split.
Buffered crossbar switch is becoming attractive due to its feature of distributed scheduling, which makes the scheduler more scalable than that in an un-buffered crossbar switch. However, previous researches on buffered crossbar switches mainly aimed at improving the throughput and cell delay performance, scarcely at the fairness and bandwidth guarantee. In this paper, we discuss the necessities of providing bandwidth guarantee in buffered crossbar switches, and propose a novel RR_MCF algorithm. RR_MCF uses a simple round robin policy at input scheduling, and a most credit first policy at output scheduling. By given a predetermined reserved bandwidth matrix, simulations show RR_MCF could provide good bandwidth guarantee for each flow, even with the presence of ill-behaved flows.
Its very important to improve the sensitivity of the near- infrared tissue oximeter during practical non-invasive measurement on human muscle. It has been thought that this sensitivity is influenced by the existence of overlying tissues such as skin and fat because only those photons which have passed through the muscle bring back useful information. In this paper, the influences of fat layer, detecting distance, wavelength, and the oxygenation in muscle on photon partial path length in muscle layer are discussed based on Monte-Carlo simulation results. Also examined are the statistical error in simulation and the noise in detector. Finally, the experimental results of the cuff occlusion on forearm are given. The results show the relationship between the sensitivity of the tissue oximeter and the detecting distance, which has the same tendency as the simulation predicted.
This paper presents approaches to real-time motion planning for robot application in flexible manufacturing systems (FMS), which are based on an algorithm for fast mapping obstacles from a workspace (W-space) into a configuration space (C-space) by defining fundamental obstacles in W-space. The mapping time for a two-dimensional obstacle is about constant. To plan a collision-free path for a master robot in a multiple robot system, a free subspace is built by computing slice C-space obstacles, while swept volumes produced during master robot motion are computed as additional moving obstacles for a generation of a collision-free path for a slave robot. For robot motion planning with many degrees of freedom, several types of reactive behavior are defined to coordinate motion conflicts between different links and the approach to motion planning with a few degrees of freedom is adopted to quantitatively realize reactive behavior. In order to demonstrate the effectiveness of the proposed approaches, graphical simulation experiments are reported.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.