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Cooperative and non-cooperative processes of apparent movement of random-dot cinematograms

Cooperative and non-cooperative processes of apparent movement of random-dot cinematograms 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 http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Spatial Vision (continued as Seeing & Perceiving from 2010) Brill

Cooperative and non-cooperative processes of apparent movement of random-dot cinematograms

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Publisher
Brill
Copyright
© 1985 Koninklijke Brill NV, Leiden, The Netherlands
ISSN
0169-1015
eISSN
1568-5683
DOI
10.1163/156856885X00062
Publisher site
See Article on Publisher Site

Abstract

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

Journal

Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill

Published: Jan 1, 1985

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