Deng Ji, Li Jian, Feng Hao, Ding Shumeng, Xiao Yu, Han Wenzhong, Zeng Zhoumo
Opt Express. 2020 Nov 23;28(24):36346-36360. doi: 10.1364/OE.408835.
Intensity-based fringe projection profilometry (IBFPP) is used widely because of its simple structure, high robustness, and noise resilience. Most IBFPP methods assume that any scene point is illuminated by direct illumination only, but global illumination effects introduce strong biases in the reconstruction result for many real-world scenes. To solve this problem, this paper describes an efficient IBFPP method for reconstructing three-dimensional geometry in the presence of global illumination. First, the average intensity of two sinusoidal patterns is used as a pixel-wise threshold to binarize the codeword patterns. The binarized template pattern is then used to convert other binarized fringe patterns into traditional Gray-code patterns. A proprietary compensation algorithm is then applied to eliminate fringe errors caused by environmental noise and lens defocusing. Finally, simple, efficient, and robust phase unwrapping can be achieved despite the effects of subsurface scattering and interreflection. Experimental results obtained in different environments show that the proposed method can obtain three-dimensional information reliably when influenced by global illumination.
基于强度的条纹投影轮廓术（IBFPP）因其结构简单、鲁棒性高和抗噪声能力强而被广泛应用。大多数IBFPP方法假定任何场景点仅由直接光照照明，但全局光照效应会给许多真实世界场景的重建结果带来强烈偏差。为解决此问题，本文描述了一种在存在全局光照的情况下重建三维几何形状的高效IBFPP方法。首先，将两个正弦图案的平均强度用作逐像素阈值对码字图案进行二值化。然后，使用二值化的模板图案将其他二值化条纹图案转换为传统的格雷码图案。接着应用一种专有补偿算法来消除由环境噪声和镜头散焦引起的条纹误差。最后，尽管存在次表面散射和相互反射的影响，仍可实现简单、高效且鲁棒的相位展开。在不同环境下获得的实验结果表明，所提出的方法在受到全局光照影响时能够可靠地获取三维信息。
