Cooperative and non-cooperative processes of apparent movement of random-dot cinematograms* J. J. CHANG and B. JULESZ AT & T Bell Laboratories, Murray Hill, N J 07974, USA Received 7 December 1984; accepted in revised form 1 May 1985 Abstract-In this study, we investigated the cooperative and non-cooperative models of stereopsis on apparent movement of the short-range process using spatial frequency filtered random-dot cinematograms. Our results showed that when spatial frequencies were below 4 cycles/degree, maximum displacement (dmax) was decreasing (linearly) with increasing mean frequencies, but at 4 cycles/degree and above dmax stayed constant. For low frequencies, non-cooperative models such as Marr and Poggio's could explain these findings, but not for frequencies above 4 cycles/degree. However, in a previous study we found that the average cooperative neighbourhood for apparent movement of the short-range process is 15 arc min. This fortuitous agreement on 4 cycles/degree could suggest that dmax being constant at frequencies above 4 cycles is related to a cooperative process. INTRODUCTION When two random-dot images are presented in rapid succession, such that the two images are identical except that dots in the second image are uniformly displaced, then coherent movement can be seen. This is called a random-dot
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1985
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