IEEE Trans Pattern Anal Mach Intell - The Geometry of Reflectance Symmetries.

Tópicos

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Resumo

Different materials reflect light in different ways, and this reflectance interacts with shape, lighting, and viewpoint to determine an object's image. Common materials exhibit diverse reflectance effects, and this is a significant source of difficulty for image analysis. One strategy for dealing with this diversity is to build computational tools that exploit reflectance symmetries, such as reciprocity and isotropy, that are exhibited by broad classes of materials. By building tools that exploit these symmetries, one can create vision systems that are more likely to succeed in real-world, non-Lambertian environments. In this paper, we develop a framework for representing and exploiting reflectance symmetries. We analyze the conditions for distinct surface points to have local view and lighting conditions that are equivalent under these symmetries, and we represent these conditions in terms of the geometric structure they induce on the Gaussian sphere and its abstraction, the projective plane. We also study the behavior of these structures under perturbations of surface shape and explore applications to both calibrated and un-calibrated photometric stereo.

Resumo Limpo

differ materi reflect light differ way reflect interact shape light viewpoint determin object imag common materi exhibit divers reflect effect signific sourc difficulti imag analysi one strategi deal divers build comput tool exploit reflect symmetri reciproc isotropi exhibit broad class materi build tool exploit symmetri one can creat vision system like succeed realworld nonlambertian environ paper develop framework repres exploit reflect symmetri analyz condit distinct surfac point local view light condit equival symmetri repres condit term geometr structur induc gaussian sphere abstract project plane also studi behavior structur perturb surfac shape explor applic calibr uncalibr photometr stereo

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