Arthur Faisman

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The human visual system has a remarkable ability to perceive three-dimensional (3-D) surface shape from shading and specular reflections. This paper presents two experiments that examined the perception of local qualitative shape under various conditions. Surfaces were rendered using standard computer graphics models of matte, glossy, and mirror reflectance(More)
To visualize the shape of 2D surface data, one often renders it using a simple model with matte or glossy reflectance and a light source at infinity. The parameter choices for this model are typically <i>ad hoc</i>, however, and previous studies have provided varying evidence on what this choice should be so that the shape is perceived as accurately as(More)
The shape we perceive from a rendered surface depends on the true surface shape, but also on the surface reflectance, the illumination, the surface motion, and the viewer's position. Here we present an experiment that addresses how perceived shape depends on shading and specular reflections, where the latter include highlights [Blake and B&#252;lthoff 1990](More)
Environment maps are commonly used in computer graphics to approximate the appearance of smoothly curved surfaces with mirror-like reflectance. Perceiving the shape of such surfaces is a challenging task for the visual system, however, because the image intensities are determined both by the surface shape and by the environment [Fleming et al. 2004]. Here(More)
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