Symmetric-light Photometric Stereo
Symmetric-light Photometric Stereo
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DOI：
10.1109/wacv51458.2022.00039
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发表时间：
2022-01
期刊：
影响因子：
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通讯作者：
Kazuma Minami;Hiroaki Santo;Fumio Okura;Y. Matsushita
中科院分区：
文献类型：
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作者：
Kazuma Minami;Hiroaki Santo;Fumio Okura;Y. Matsushita
本文提出了一种用于表面法线估计的平行光光度立体法，其中定向光关于光学中心对称分布。与以前的研究需要的信息的环半径的环光设置，我们表明，即使没有确切的光源位置或他们的距离的知识，从光学中心，对称配置为我们提供了足够的信息，恢复独特的表面法线没有歧义。具体地说，在对称灯光下，测量一对场景点具有不同的表面法线，但相同的曲率产生一个系统的约束二次方程的表面法线，它有一个唯一的解决方案。实验结果表明，该方法在保证光度立体标定精度的同时，避免了几何光源标定的需要。
This paper presents symmetric-light photometric stereo for surface normal estimation, in which directional lights are distributed symmetrically with respect to the optic center. Unlike previous studies of ring-light settings that required the information of ring radius, we show that even without the knowledge of the exact light source locations or their distances from the optic center, the symmetric configuration provides us sufficient information for recovering unique surface normals without ambiguity. Specifically, under the symmetric lights, measurements of a pair of scene points having distinct surface normals but the same albedo yield a system of constrained quadratic equations about the surface normal, which has a unique solution. Experiments demonstrate that the proposed method alleviates the need for geometric light source calibration while maintaining the accuracy of calibrated photometric stereo.