Programmable Non-Epipolar Indirect Light Transport: Capture and Analysis

Programmable Non-Epipolar Indirect Light Transport: Capture and Analysis
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可编程非极间接光传输:捕获和分析

DOI:
10.1109/tvcg.2019.2946812
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发表时间:
2021
影响因子:
5.2
通讯作者:
Narasimhan, Srinivasa G.
Narasimhan, Srinivasa G.
中科院分区:
计算机科学1区
文献类型:
--
作者:
Kubo, Hiroyuki;Jayasuriya, Suren;Iwaguchi, Takafumi;Funatomi, Takuya;Mukaigawa, Yasuhiro;Narasimhan, Srinivasa G.

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将光传输分解为直接和全局分量、漫反射和镜面互反射以及次表面散射,可以在日常场景中实现光的新可视化。特别是,间接光包含有关可用于计算机视觉和逆渲染应用的材质复杂外观的大量信息。在本文中,我们提出了一种新的成像技术,该技术使用同步投影仪相机系统通过光传输捕获和分析间接光的成分。校正系统用与投影仪行相对应的极面照亮场景,我们改变两个关键参数来捕获投影仪行和相机像素之间的平面到光线光传输:(1)卷帘快门中投影仪行和相机行之间的偏移(实现为同步延迟),以及(2)相机行的曝光。我们描述了这种同步卷帘快门如何执行照明复用,并开发了一种非线性优化算法来对生成的 3D 光传输算子进行解复用。使用我们的系统,我们能够捕获实时短程和长程非极间接光传输,消除次表面散射、漫反射和镜面互反射的歧义,并根据次表面散射特性区分材料。特别是,我们展示了间接成像在捕获和分析人体皮肤中隐藏的静脉结构方面的实用性。
The decomposition of light transport into direct and global components, diffuse and specular interreflections, and subsurface scattering allows for new visualizations of light in everyday scenes. In particular, indirect light contains a myriad of information about the complex appearance of materials useful for computer vision and inverse rendering applications. In this paper, we present a new imaging technique that captures and analyzes components of indirect light via light transport using a synchronized projector-camera system. The rectified system illuminates the scene with epipolar planes corresponding to projector rows, and we vary two key parameters to capture plane-to-ray light transport between projector row and camera pixel: (1) the offset between projector row and camera row in the rolling shutter (implemented as synchronization delay), and (2) the exposure of the camera row. We describe how this synchronized rolling shutter performs illumination multiplexing, and develop a nonlinear optimization algorithm to demultiplex the resulting 3D light transport operator. Using our system, we are able to capture live short and long-range non-epipolar indirect light transport, disambiguate subsurface scattering, diffuse and specular interreflections, and distinguish materials according to their subsurface scattering properties. In particular, we show the utility of indirect imaging for capturing and analyzing the hidden structure of veins in human skin.
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