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Journal of Vision (2004) 4, 944-954 http://journalofvision.org/4/10/9/ 944 The geometry of the occluding contour and
 

Summary: Journal of Vision (2004) 4, 944-954 http://journalofvision.org/4/10/9/ 944
The geometry of the occluding contour and
its effect on motion interpretation
Josh McDermott
Department of Brain and Cognitive Science,
MIT, Cambridge, MA, USA
Edward H. Adelson
Department of Brain and Cognitive Science,
MIT, Cambridge, MA, USA
Form information related to occlusion is needed to correctly interpret image motion. This work describes one of a series of
investigations into the form constraints on motion perception. In the present study, we focus specifically on the geometry
of the occluding contour, and in particular on whether its influence on motion can be accounted for merely by its effect on
perceived occlusion. We used an occluded square moving in a circle, holding the T-junctions at points of occlusion
constant while manipulating the occluding contour. We found evidence for two main influences of occluding contour
geometry on motion interpretation and occlusion: the convexity of the occluding contour and additional static T-junctions
that are formed elsewhere on the occluding contour. Our results suggest that convex occluding contours are more
occlusive than concave ones, and that T-junctions along the contour increase or decrease the strength of occlusion
depending on their orientation. Motion interpretation is influenced by both factors, but their effect on motion appears to be
dominated by interactions occurring at an intermediate "semilocal" scale, which is larger than the scale at which junctions
are defined, but smaller than the scale of the whole moving figure. We propose that these computations are related to

  

Source: Adelson, Edward - Computer Science and Artificial Intelligence Laboratory, Department of Brain and Cognitive Science, Massachusetts Institute of Technology (MIT)

 

Collections: Biology and Medicine