Tracking of wet foam ageing by means of dynamic laser speckle and an optical flow sensor is presented. Using a computer optical mouse, like an optical flow sensor, a strong negative correlation between the average speed of the cursor and the coarsening of bubble was found. We used microscopic images to demonstrate that decreasing of speed is related with increasing of bubble size. The proposed setup allows sensitive measures, is not very expensive and highly portable.
Unlike the color -which is a quality without physical meaning and that involves subjective estimation of interaction of
electromagnetic radiation with surfaces- spectral reflectance is a physical property that characterizes different materials,
no matter what chromatic content of illuminant and the spectral response of the sensor. This means that the spectral
reflectance is a magnitude of particular interes in both reconstruction and reproduction in digital color systems.
In this paper, two approaches to the numerical reconstruction of spectral reflectance curves of samples of oil painting on
canvas, are presented. These approaches need a set of spectral reflectance curves, given by a spectrophotometer, and
their respective sampling using color filters placed in front of a monochrome CCD camera.
The first approach is based on the interpolation of the camera response to each color filter. The second one, relies in
obtain a vectorial base and appropiate coefficients to reconstruct the spectral reflectance curve. Goodness of fit
coefficient (GFC) and absolute mean error (ABE) are the metrics used to evaluate the performance of the proposed
procedures.
This paper presents a segmentation technique for sandstone microscopic images. A sintetized image is obtained by means of operations with three images captured by a CCD camera at a specific wavelength and different polarization angles between polars and analyzer. Thus it is possible to obtain some characteristics to define size and shape of sandstone grains.
This paper presents a digital implementation of an out-of- plane target location system by means of a joint transform correlator (JTC). A sequence of images of the 3D scene is coded into a single performing an integration of each frame in the vertical sense. The coded sequence is used as the input plane of the JTC after binarization, Fourier transform is performed followed by removal of the DC term from joint power spectrum; finally correlation is evaluated.
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