Yu Ying, Lau Daniel L, Ruffner Matthew P, Liu Kai
Appl Opt. 2020 Feb 1;59(4):964-974. doi: 10.1364/AO.378363.
Structured light illumination is an active three-dimensional scanning technique that uses a projector and camera pair to project and capture a series of stripe patterns; however, with a single camera and single projector, structured light scanning has issues associated with scan occlusions, multi-path, and weak signal reflections. To address these issues, this paper proposes dual-projector scanning using a range of projector/camera arrangements. Unlike previous attempts at dual-projector scanning, the proposed scanner drives both light engines simultaneously, using temporal-frequency multiplexing to computationally decouple the projected patterns. Besides presenting the details of how such a system is built, we also present experimental results demonstrating how multiple projectors can be used to (1) minimize occlusions; (2) achieve higher signal-to-noise ratios having twice a single projector's brightness; (3) reduce the number of component video frames required for a scan; and (4) detect multi-path interference.
结构光照明是一种主动三维扫描技术，它使用投影仪和相机对来投射和捕捉一系列条纹图案；然而，对于单相机和单投影仪的情况，结构光扫描存在与扫描遮挡、多路径和弱信号反射相关的问题。为了解决这些问题，本文提出了使用一系列投影仪/相机配置的双投影仪扫描方法。与之前双投影仪扫描的尝试不同，所提出的扫描仪同时驱动两个光引擎，利用时间频率复用在计算上解耦投射图案。除了介绍这种系统的构建细节外，我们还展示了实验结果，证明了多个投影仪可如何用于：(1) 最小化遮挡；(2) 实现具有两倍于单个投影仪亮度的更高信噪比；(3) 减少扫描所需的分量视频帧数；以及 (4) 检测多路径干扰。
