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Study on Optical Flow Computation Methods for Video Image

Author: WangZuo
Tutor: XieJianBin
School: National University of Defense Science and Technology
Course: Electronic Science and Technology
Keywords: Optical flow field Gradient constraint equation Discontinuous area Iteration Multigrid
CLC: TP391.41
Type: Master's thesis
Year: 2007
Downloads: 367
Quote: 8
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Abstract


Optical flow is the movement of the surface of the video image brightness mode optical flow calculation is one of the main methods of dynamic analysis of video images , the domestic and foreign scholars differential optical flow algorithm to match the optical flow algorithm , based on the energy of the optical flow algorithm based phase optical flow algorithm . However , optical flow calculation is an ill - posed problem , as the moving speed increases , for gray-scale variation discontinuous region optical flow calculation , the constant brightness is assumed that the error will be increased, so that the optical flow calculation accuracy is reduced . Further, the optical flow calculation requires large number of iterations , the calculation speed is slow to affect the process of the application of the optical flow techniques . This article first systematic study of the basic theory of optical flow , in-depth analysis of the gradient-based optical flow calculation method , and the need to address the issues are discussed in detail . And then for calculation of the optical flow in at the boundary of the moving target , the gradation non - continuous change is proposed an optical flow calculation method based on the non - continuous region of the gradient , this method on the basis of the smoothness constraint , outline constraint to improve the robustness of the algorithm . Finally , for the problem of slow optical flow computation based multigrid optical flow calculation method , the method using multigrid iteration convergence speed advantages , solving by the optical flow constraint equation, Euler equation , simulation results show that the multigrid method to calculate the optical flow field can obviously reduce the number of iterations , and improve computing speed .

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CLC: > Industrial Technology > Automation technology,computer technology > Computing technology,computer technology > Computer applications > Information processing (information processing) > Pattern Recognition and devices > Image recognition device
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