Multiplexed illumination for scene recovery in the presence of global illumination
Multiplexed illumination for scene recovery in the presence of global illumination
复制标题
在存在全局照明的情况下用于场景恢复的多路照明
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Nayar
中科院分区：
文献类型：
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作者：
Jinwei Gu;Toshihiro Kobayashi;Mohit Gupta;S. Nayar
全局照明效应，如相互反射和次表面散射导致系统的，往往是显着的错误，在场景恢复使用主动照明。最近，它表明，直接和全局分量可以有效地分离与一个单一的光源照明的场景。本文研究了多光源的直接全局分离问题。我们推导出所需的图像的数量的理论下限，并提出了一个多路复用的照明方案，实现这一下限。我们分析的信号噪声比（SNR）特性的直接全球分离的背景下，所提出的照明复用方法。我们将我们的方法应用到需要多个光源的场景恢复技术中，包括阴影形状，结构光3D扫描，光度立体和反射率估计。仿真和实验结果表明，与按顺序分离每个光源的直接全局分量相比，该方法能用较少的图像准确地恢复场景信息。
Global illumination effects such as inter-reflections and subsurface scattering result in systematic, and often significant errors in scene recovery using active illumination. Recently, it was shown that the direct and global components could be separated efficiently for a scene illuminated with a single light source. In this paper, we study the problem of direct-global separation for multiple light sources. We derive a theoretical lower bound for the number of required images, and propose a multiplexed illumination scheme which achieves this lower bound. We analyze the signal-to-noise ratio (SNR) characteristics of the proposed illumination multiplexing method in the context of direct-global separation. We apply our method to several scene recovery techniques requiring multiple light sources, including shape from shading, structured light 3D scanning, photometric stereo, and reflectance estimation. Both simulation and experimental results show that the proposed method can accurately recover scene information with fewer images compared to sequentially separating direct-global components for each light source.