Calibrating Photometric Stereo by Holistic Reflectance Symmetry Analysis
Calibrating Photometric Stereo by Holistic Reflectance Symmetry Analysis
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DOI：
10.1109/cvpr.2013.197
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发表时间：
2013-06
期刊：
影响因子：
--
通讯作者：
Zhe Wu;P. Tan
中科院分区：
文献类型：
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作者：
Zhe Wu;P. Tan
Under unknown directional lighting, the uncalibrated Lambertian photometric stereo algorithm recovers the shape of a smooth surface up to the generalized bas-relief (GBR) ambiguity. We resolve this ambiguity from the half vector symmetry, which is observed in many isotropic materials. Under this symmetry, a 2D BRDF slice with low-rank structure can be obtained from an image, if the surface normals and light directions are correctly recovered. In general, this structure is destroyed by the GBR ambiguity. As a result, we can resolve the ambiguity by restoring this structure. We develop a simple algorithm of auto-calibration from separable homogeneous specular reflection of real images. Compared with previous methods, this method takes a holistic approach to exploiting reflectance symmetry and produces superior results.
