Exploiting DLP Illumination Dithering for Reconstruction and Photography of High-speed Scenes
Exploiting DLP Illumination Dithering for Reconstruction and Photography of High-speed Scenes
复制标题
利用 DLP 照明抖动进行高速场景的重建和摄影
DOI：
10.1007/s11263-011-0454-y
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发表时间：
2012
影响因子：
19.5
通讯作者：
Srinivasa G. Narasimhan
中科院分区：
文献类型：
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作者：
Sanjeev J. Koppal;Shuntaro Yamazaki;Srinivasa G. Narasimhan
在这项工作中，我们通过利用廉价且易于使用的数字光处理 (DLP) 投影仪的高速照明“抖动”来恢复快速移动的场景。我们首先展示如何使用高速相机对现成投影仪的时间抖动进行逆向工程。 DLP 抖动可以产生主动视觉技术中常用的时间模式。由于抖动发生在非常高的帧速率下，因此这种基于照明的方法可以针对快速场景“加速”。我们通过三个应用程序演示了这一点，每个应用程序只需要 DLP 投影仪显示一张幻灯片。结果的质量由用户可用的相机帧速率决定。将高速相机和 DLP 投影仪配对，我们演示了 100 Hz 的结构光重建。使用相同的相机和三个或更多 DLP 投影仪，我们展示了 300 Hz 的光度立体和解复用应用。最后，通过实时 (60 Hz) 或静态相机，我们展示了 DLP 照明充当非常快的闪光灯，允许对高速场景进行频闪摄影。我们通过特定投影仪的案例研究深入讨论时间抖动的一些特征。最后，我们描述了与这项工作相关的限制、权衡和其他问题。
In this work, we recover fast moving scenes by exploiting the high-speed illumination “dithering” of cheap and easily available digital light processing (DLP) projectors. We first show how to reverse-engineer the temporal dithering for off-the-shelf projectors, using a high-speed camera. DLP dithering can produce temporal patterns commonly used in active vision techniques. Since the dithering occurs at a very high frame-rate, such illumination-based methods can be “speed up” for fast scenes. We demonstrate this with three applications, each of which only requires a single slide to be displayed by the DLP projector. The quality of the result is determined by the camera frame-rate available to the user. Pairing a high-speed camera and a DLP projector, we demonstrate structured light reconstruction at 100 Hz. With the same camera and three or more DLP projectors, we show photometric stereo and demultiplexing applications at 300 Hz. Finally, with a real-time (60 Hz) or still camera, we show that DLP illumination acts as a very fast flash, allowing strobe photography of high-speed scenes. We discuss, in depth, some characteristics of the temporal dithering with a case study of a particular projector. Finally, we describe limitations, trade-offs and other issues relating to this work.