Download PDF by Yi-Tong Zhou: Artificial Neural Networks for Computer Vision

By Yi-Tong Zhou

ISBN-10: 0387976833

ISBN-13: 9780387976839

ISBN-10: 1461228344

ISBN-13: 9781461228349

This monograph is an outgrowth of the authors' contemporary 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 movement, and deblurring a picture. From a mathematical perspective, those inverse difficulties are ill-posed in response to Hadamard. Researchers in machine imaginative and prescient have taken the "regularization" method of those difficulties, the place one comes up with a suitable power or price functionality and unearths a minimal. extra constraints comparable to smoothness, integrability of surfaces, and renovation of discontinuities are further to the price functionality explicitly or implicitly. looking on the character of the inver­ sion to be played and the limitations, the fee functionality may well convey a number of minima. Optimization of such nonconvex services may be very concerned. even supposing development has been made in making recommendations reminiscent of simulated annealing computationally extra average, it really is our view that you can actually usually locate passable strategies utilizing deterministic optimization algorithms.

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Static Stereo 29 The network parameters, the interconnection strengths Ti,j,k;l,m,n and the bias inputs Ii,j,k, Can be determined in terms of the energy function of the network. )} are the first order intensity derivatives of the left and right images, respectively, S is an index set excluding (0,0) for all the neighbors in a r x' r window centered at point (i,j), and oX is a constant. 30) is called the photometric constraint, which seeks disparity values such that all regions of two images are matched in a least squares sense.

Then the coarse disparity map is used to reduce the search range for the pair with the next longer baseline. This procedure is continued until the pair with the largest baseline is processed. One major advantage of this method is that occlusions can be predicted from the previous disparity map to avoid mismatches at the present step. Although the computation time is less compared to other coarse-to-fine methods, this method gives only a sparse disparity map and cannot be implemented on line. Matthies, Szeliski and Kanade [MSK88] have introduced two real time approaches, based on intensity values and features using a Kalman filtering technique.

Is the focal length of the lens which takes a positive value in the space system. (Yo +(p-l)vt)) x" Y. Zo' Zo . 1) Theoretically, the disparity Do can be derived from two successive image frames ! 2) Do = YP - Yp-l = Zo ' which is the same as the formula used in static stereo. However, noise distortion, spatial quantization error and motion blur limit the estimation accuracy. In order to achieve high accuracy, a long sequence of image frames is required. 1 Estimation of Measurement Primitives ESTIMATION OF DERIVATIVES As only derivatives in the horizontal direction are required for matching, the epipolar constraint saves a lot of computations.

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Artificial Neural Networks for Computer Vision by Yi-Tong Zhou


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