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Shape perception from binocular disparity and structure-from-motion

ABSTRACT When two sources of depth information are combined, the result might be dominance of one source, cooperative interaction between the sources, or an additive combination of the sources. For transparent stereo-motion displays we found a cooperative interaction: structure-from-motion facilitates disparity processing, probably by helping to resolve the stereo correspondence problem. For opaque stimuli the combination of structure-from-motion and stereopsis appears to be additive. 1. INTRODUCTION Binocular disparity1 and structure-from-motion (SFM)2 are two of the principal sources of information available for recovering 3-D relationships from 2-D images. However, neither binocular disparity nor SFM alone completely specifiesboth an object's shape and orientation relative to an observer. Binocular disparity unambiguously specifies near/far relations,but the shape of the object is only determined up to a scale factor (jerceived fixation distance).1 Structure-from-motion, onthe other hand, may provide information about object shape, but near/far relations between the object and the observer are notspecified.3 Because these two sources of information provide human observers with related but non-redundant informationabout shape and depth, the combination of binocular disparity and SFM could possibly provide a more robust representation