利用对称光源实现无需初始化的近光摄像立体重建
Near-light Photometric Stereo with Symmetric Lights
- 通过多组对称近光光源布局，推导出表面法向与深度的闭式解
- 在未校准空间偏移下仍可准确恢复形状，精度媲美先进方法
- 适合对初始参数不敏感、光照校准困难的场景应用
本文提出一种基于对称光源布置的线性近光摄像立体求解方法。与传统非凸优化方法不同，通过设置多组关于任意点对称分布的近距光源对，该方法可直接求得表面法向与深度的闭式解，无需初始值。即使整体空间偏移未校准，只要光源呈对称分布即可正常工作。实验表明，该方法在形状恢复精度上达到当前最优校准近光摄像立体方法水平，同时显著降低对精细深度初始化和光照校准的需求。
原文摘要 · Abstract (English)
This paper describes a linear solution method for near-light photometric stereo by exploiting symmetric light source arrangements. Unlike conventional non-convex optimization approaches, by arranging multiple sets of symmetric nearby light source pairs, our method derives a closed-form solution for surface normal and depth without requiring initialization. In addition, our method works as long as the light sources are symmetrically distributed about an arbitrary point even when the entire spatial offset is uncalibrated. Experiments showcase the accuracy of shape recovery accuracy of our method, achieving comparable results to the state-of-the-art calibrated near-light photometric stereo method while significantly reducing requirements of careful depth initialization and light calibration.
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