The role of perspective effects and accelerations in perceived three-dimensional structure-from-motion
article
It has been suggested that perceived three-dimensional (3D) structure-from-motion can be accounted for by a 2-frame orthographic approximation of the flow field. This study investigated the extent to which higher order cues (perspective and acceleration) are used in addition to first-order flow. Participants matched the 3D dihedral angle of a hinged plane (probe) defined by multiple-depth cues to one defined by motion only, for stimulus sizes of 8 and 33°, using perspective and orthographic projection. The results show that perspective effects can be important even for relatively small stimuli (8°) and that accelerations contribute to perceived shape. In all conditions, large biases were found. These are well accounted for by a model in which ail relevant flow measurements (first-order, perspective, and acceleration) are used together with estimates of the noise in each. The model has no built-in bias toward particular 3D shapes. Instead, the visual system may act as an optimal estimator of 3D structure-from-motion.
Topics
TNO Identifier
9800
Source
Journal of Experimental Psychology: Human Perception and Performance, 26(3), pp. 934 - 955.
Pages
934 - 955
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