University of Birmingham Sun and sky: Does human vision assume a mixture of point and diffuse illumination when interpreting shape-from-shading?
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Publisher Rights Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Vision Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Vision Research, Vol 51, Issues 21-2, DOI: 10.1016/j.visres.2011.09.004.
منابع مشابه
The University of Birmingham (Live System) Sun and sky: Does human vision assume a mixture of point and diffuse illumination when interpreting shape-from-shading?
Publisher Rights Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Vision Research. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication....
متن کاملSun and sky: Does human vision assume a mixture of point and diffuse illumination when interpreting shape-from-shading?
People readily perceive smooth luminance variations as being due to the shading produced by undulations of a 3-D surface (shape-from-shading). In doing so, the visual system must simultaneously estimate the shape of the surface and the nature of the illumination. Remarkably, shape-from-shading operates even when both these properties are unknown and neither can be estimated directly from the im...
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Users of geographic information systems (GIS) usually render terrain using a point light source defined by an illumination vector. A terrain shaded from a single point provides good perceptual cues to surface orientation. This type of hill shading, however, does not include any visual cues to the relative height of surface elements. We propose shading the terrain under uniform diffuse illuminat...
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tion, such as when a thin cloud passes in front of the sun and the illumination becomes more diffuse. Similarly, we We attempt to cast light on illumination by introducing a computational model of light sources and illumination. Spaoften have difficulty guessing the lighting configuration in tially varying illumination is computed using coordinate transa scene, such as in a magazine photograph,...
متن کاملShape Information From Shading: A Theory About Human Perception
I present evidence that people assume a simple, linear reflectance function when interpreting shading information. Using this reflectance function I derive a closed-form solution to the problem of extracting shape information from image shading. The solution does not employ an assumption about surface smoothness and so is directly applicable to complex natural surfaces such as hair or cloth. A ...
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تاریخ انتشار 2017