Get Artificial Neural Networks for Computer Vision PDF

By Yi-Tong Zhou

ISBN-10: 0387976833

ISBN-13: 9780387976839

ISBN-10: 1461228344

ISBN-13: 9781461228349

This monograph is an outgrowth of the authors' fresh learn at the de­ velopment of algorithms for numerous low-level imaginative and prescient difficulties utilizing man made neural networks. particular difficulties thought of are static and movement stereo, computation of optical move, and deblurring a picture. From a mathematical perspective, those inverse difficulties are ill-posed based on Hadamard. Researchers in desktop imaginative and prescient have taken the "regularization" method of those difficulties, the place one comes up with a suitable strength or expense functionality and unearths a minimal. extra constraints equivalent to smoothness, integrability of surfaces, and upkeep of discontinuities are further to the associated fee functionality explicitly or implicitly. reckoning on the character of the inver­ sion to be played and the restrictions, the fee functionality may possibly show numerous minima. Optimization of such nonconvex features may be very concerned. even though development has been made in making concepts similar to simulated annealing computationally extra moderate, it really is our view that you may frequently locate passable strategies utilizing deterministic optimization algorithms.

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10 . 15 . 20 . 25. )0 . 35 . 40 . 45 . 50 . 55 . 60 . 3. A section of a real image with amplitude bias 20 and 30 dB noise. (a) Intensity values of original and noisy images. (b) First order derivatives of intensity values of original and 'n oisy images. 3. Estimation of Intensity Derivatives Example 2: An amplitude bias of size 20 and white Gaussian noise corresponding to 20 dB SNR were added to the original image. 4 shows a section of the image taken from the same location as in Example 1. 3{a) gives the original and noisy biased images.

It is common to move the camera from the left side to the right side or from the right side to the left side. Many lateral motion stereo algorithms have also been proposed. Xu, Tsuji and Asada [XTA87] have suggested a coarse-to-fine iterative method for lateral motion stereo. By sliding a camera along a straight line, a sequence of images is taken at predetermined positions. The pair with the short baseline is matched first to produce a coarse disparity map based on the zero-crossings. Then the coarse disparity map is used to reduce the search range for the pair with the next longer baseline.

Marr suggested [Mar82] that in order to detect intensity changes efficiently, the filter used should first be a differential operator, taking either a first or second order spatial derivative of the image, and second be capable of being tuned to act at any appropriate scale. The following examples show that by choosing a proper window size, the effects of noise can be very efficiently eliminated. A 256 x 256 real image is used in these examples. Example 1: An amplitude bias of strength 20 and white Gaussian noise (30 dB SNR) were added to the image.

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Artificial Neural Networks for Computer Vision by Yi-Tong Zhou


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