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Description: Diffuse objects generally tell us little about the surround-
ing lighting, since the radiance they reflect blurs together
incident lighting many directions. In this paper we
discuss how occlusion geometry can help invert diffuse
reflectance to recover lighting or surface albedo. Self-
occlusion in the scene can be regarded as a form of coding,
creating high frequencies that improve the conditioning of
diffuse light transport. Our analysis builds on a basic obser-
vation that diffuse reflectors with sufficiently detailed geome-
try can fully resolve the incident lighting
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