ANIMATION OF FIGURES 11.12 and 11.13

Boundary flow

In the video, the two patches of randomly placed dots are interpreted as lying on two surfaces, one in front of and partially occluding the other, while the vertically oriented line is seen as the boundary of the surface perceived to be in front. The surface seen to be in front changes depending on the motion of the line relative to the two patches of dots.

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For more information, see Thompson, W.B., Mutch, K.M. & Berzins, V.A. (1985); Dynamic occlusion analysis in optical flow fields; IEEE Transactions on Pattern Analysis and Machine Intelligence, 7(2), 133-138; and Yonas, A., Craton, L.G. , & Thompson, W.B. (1987); Relative motion: Kinetic information for the order of depth at an edge; Perception & Psychophysics, 41(1), 53-59.