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Geometry of shadows
1997
Optical Society of America. Journal A: Optics, Image Science, and Vision
Shadows provide a strong source of information about the shapes of surfaces. We analyze the local geometric structure of shadow contours on piecewise smooth surfaces. Particular attention is paid to intrinsic shadows on a surface: that is, shadows created on a surface by the surface's own shape and placement relative to a light source. Intrinsic shadow contours provide useful information about the direction of the light source and the qualitative shape of the underlying surface. We analyze the
doi:10.1364/josaa.14.003216
pmid:9392900
fatcat:yfz64vnz7zfybkrf26kkmbtqxm