Print Email Facebook Twitter The role of perspective effects and accelerations in perceived three-dimensional structure-from-motion Title The role of perspective effects and accelerations in perceived three-dimensional structure-from-motion Author Hogervorst, M.A. Eagle, R.A. Publication year 2000 Abstract 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. Subject PerceptionBayes theoremhumanmovement perceptionphysiologypsychological modeltime perceptionBayes TheoremHumansModels, PsychologicalMotion PerceptionTime Perception To reference this document use: http://resolver.tudelft.nl/uuid:71cae554-3b3a-44ba-a75b-2c7d0f2fe1f2 TNO identifier 9800 Source Journal of Experimental Psychology: Human Perception and Performance, 26 (3), 934-955 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.