In the last decade,problems of so called 'shape-from-X' were widely investigated theoretically. In the present paper, we examined the effects of shading on monocular stereopsis (i.e., shape from shading). In Experiment I, subjects showed the overestimation of the surface curvature under the condition in which shade information was available, while they showed the underestimation under the non shade condition. In Experiment II-V, several important factors were examined; effect of shade, perceived Position of the light source and vatage point.
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