Light Structure from Pin Motion: Simple and Accurate Point Light Calibration for Physics-Based Modeling
Light Structure from Pin Motion: Simple and Accurate Point Light Calibration for Physics-Based Modeling
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DOI：
10.1007/978-3-030-01219-9_1
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发表时间：
2018-09
期刊：
影响因子：
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通讯作者：
Hiroaki Santo;M. Waechter;M. Samejima;Yusuke Sugano;Y. Matsushita
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作者：
Hiroaki Santo;M. Waechter;M. Samejima;Yusuke Sugano;Y. Matsushita
提出了一种实用的几何点光源标定方法。与以前使用朗伯球，镜面球或镜面的作品不同，我们的校准目标由朗伯平面和平面上方未知位置的小阴影投射器组成。由于其体积小，脚轮的阴影可以比镜子上的高光更精确地定位。我们表明，给定的阴影观测从一个移动的校准目标和一个固定的摄像机，阴影投射器的位置和光的位置或方向可以同时恢复在一个结构从运动框架。我们对模拟和真实的场景的评估表明，我们的方法产生的光估计是稳定的，比现有的技术更准确，同时具有相当简单的设置，需要更少的体力劳动。
We present a practical method for geometric point light source calibration. Unlike in prior works that use Lambertian spheres, mirror spheres, or mirror planes, our calibration target consists of a Lambertian plane and small shadow casters at unknown positions above the plane. Due to their small size, the casters' shadows can be localized more precisely than highlights on mirrors. We show that, given shadow observations from a moving calibration target and a fixed camera, the shadow caster positions and the light position or direction can be simultaneously recovered in a structure from motion framework. Our evaluation on simulated and real scenes shows that our method yields light estimates that are stable and more accurate than existing techniques while having a considerably simpler setup and requiring less manual labor.