Light Structure from Pin Motion: Geometric Point Light Source Calibration
Light Structure from Pin Motion: Geometric Point Light Source Calibration
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DOI：
10.1007/s11263-020-01312-3
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发表时间：
2020-03
影响因子：
19.5
通讯作者：
Hiroaki Santo;M. Waechter;Wen-Yan Lin;Yusuke Sugano;Y. Matsushita
中科院分区：
文献类型：
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作者：
Hiroaki Santo;M. Waechter;Wen-Yan Lin;Yusuke Sugano;Y. Matsushita
提出了一种几何点光源标定方法。与使用朗伯球体，镜面球体或镜面平面的先前作品不同，我们使用由平面和位于平面上方未知位置的小阴影投射器组成的校准目标。我们表明，阴影观察从一个固定的光下移动的校准目标遵循针孔相机几何和极线几何的原则，允许联合恢复的光的位置和3D阴影投射器的位置，相当于如何从运动的传统结构联合恢复相机参数和3D特征位置从观察到的2D功能。此外，我们设计了一个统一的灯光模型，可以在一个通用框架中使用附近的点光源和远处的光。我们的评估表明，我们的方法产生轻估计是稳定的，比现有的技术更准确，同时具有更简单的设置，需要更少的体力劳动。
We present a method for geometric point light source calibration. Unlike prior works that use Lambertian spheres, mirror spheres, or mirror planes, we use a calibration target consisting of a plane and small shadow casters at unknown positions above the plane. We show that shadow observations from a moving calibration target under a fixed light follow the principles of pinhole camera geometry and epipolar geometry, allowing joint recovery of the light position and 3D shadow caster positions, equivalent to how conventional structure from motion jointly recovers camera parameters and 3D feature positions from observed 2D features. Moreover, we devised a unified light model that works with nearby point lights as well as distant light in one common framework. Our evaluation shows that our method yields light estimates that are stable and more accurate than existing techniques while having a much simpler setup and requiring less manual labor.