Piecewise-Smooth Dense Optical Flow via Level Sets |
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Authors: | T Amiaz N Kiryati |
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Affiliation: | (1) School of Electrical Engineering, Tel Aviv University, Tel Aviv, 69978, Israel |
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Abstract: | We propose a new algorithm for dense optical flow computation. Dense optical flow schemes are challenged by the presence of
motion discontinuities. In state of the art optical flow methods, over-smoothing of flow discontinuities accounts for most
of the error. A breakthrough in the performance of optical flow computation has recently been achieved by Brox et~al. Our
algorithm embeds their functional within a two phase active contour segmentation framework. Piecewise-smooth flow fields are
accommodated and flow boundaries are crisp. Experimental results show the superiority of our algorithm with respect to alternative
techniques. We also study a special case of optical flow computation, in which the camera is static. In this case we utilize
a known background image to separate the moving elements in the sequence from the static elements. Tests with challenging
real world sequences demonstrate the performance gains made possible by incorporating the static camera assumption in our
algorithm. |
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Keywords: | Optical flow piecewise-smoothness level-sets variational methods |
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