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Geometric and induced effects in binocular stereopsis and motion parallax

Summary: Geometric and induced effects in binocular stereopsis and
motion parallax
Robert S. Allison a,*, Brian J. Rogers b
, Mark F. Bradshaw c
Department of Computer Science, Centre for Vision Research, York University, Toronto, Ont., Canada M3J 1P3
Department of Experimental Psychology, University of Oxford, Oxford, OX1 3UD, UK
Department of Psychology, University of Surrey, Guildford, Surrey, GU2 5XH, UK
Received 4 September 2001; received in revised form 25 April 2003
This paper examines and contrasts motion-parallax analogues of the induced-size and induced-shear effects with the equivalent
induced effects from binocular disparity. During lateral head motion or with binocular stereopsis, vertical-shear and vertical-size
transformations produced ‘induced effects’ of apparent inclination and slant that are not predicted geometrically. With vertical head
motion, horizontal-shear and horizontal-size transformations produced similar analogues of the disparity induced effects. Typically,
the induced effects were opposite in direction and slightly smaller in size than the geometric effects. Local induced-shear and induced-
size effects could be elicited from motion parallax, but not from disparity, and were most pronounced when the stimulus contained
discontinuities in velocity gradient. The implications of these results are discussed in the context of models of depth perception from
disparity and structure from motion.


Source: Allison, Robert - Department of Computer Science, York University (Toronto)


Collections: Computer Technologies and Information Sciences; Biology and Medicine