Abstract
In many laboratory setups and in many day-to-day situations, a unique solution of the structure-fromtwo-views problem is unobtainable. Yet, when the visual system is presented with two projections in a sequence, it nevertheless appears to generate a reasonably stable percept of structure. In the research reported here, we examined whether the same surface would be perceived when subjects were presented with a pair of views that alternated in time monocularly (two-frame motion) or were shown simultaneously to both eyes (stereo). In Experiment 1, we studiedslant perception: human observers were asked to match the slant of a motion-induced planar surface with its stereo-induced counterpart. In Experiment 2, the perceivedcurvature of parabolic surfaces was matched in a similar way. The results show that motion-induced slant is matched with ahigher value of the stereo-induced slant. However, the curvature experiment showed that motion-induced curvature is matched with alower stereo-induced curvature. One possible explanation may be that the slant and curvature are internally inconsistent in at least one of the modalities.
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S. C. de V. was funded by the SPIN project “3D Computer Vision” of the Dutch Ministry of Economic Affairs; P. W. was funded by the In-Sight II project of the ESPRIT Basic Research Actions of the European Community.
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De Vries, S.C., Werkhoven, P. Cross-modal slant and curvature matching of stereo- and motion-induced surfaces. Perception & Psychophysics 57, 1175–1186 (1995). https://doi.org/10.3758/BF03208373
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DOI: https://doi.org/10.3758/BF03208373