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- W2113784097 abstract "A number of proposed optical flow estimation algorithms for image motion analysis use only a few subsequent frames from an image sequence to perform calculation. Others, that use many frames, as is case in frequency and energy based, as well as in stochastic optical flow algorithms, are better suited for off-line work. We present our approach in adopting a classic gradient optical flow algorithm for on-line work over extended image sequence. Our experiments on the usual optical flow testing image sequences, consisting of few dozens of image frames show significant improvements in accuracy of the estimated velocity flow fields and in speed of computation. This is achieved by modification and integration of three basic processing phases: preparation of a limited spatio-temporal volume, estimation of velocity flow fields and post filtering of the flow fields. In the preparation phase we use efficient spatio-temporal filters for image smoothing. In the estimation phase a modified iterative solution that propagates results from previous calculation steps is used. Linear and nonlinear post filtering additionally improve optical flow estimates. The whole process is less sensitive to the aperture problem and produces more accurate flow field estimates than the original algorithm. It better copes with motion discontinuities as well. We evidence our achievements by a number of experiments on extended image sequences." @default.
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- W2113784097 date "2005-08-29" @default.
- W2113784097 modified "2023-09-25" @default.
- W2113784097 title "Optical flow estimation over extended image sequence" @default.
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- W2113784097 doi "https://doi.org/10.1109/melcon.2000.879991" @default.
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