Temporal Dithering of Illumination for Fast Active Vision
Temporal Dithering of Illumination for Fast Active Vision
复制标题
用于快速主动视觉的照明时间抖动
DOI：
10.1007/978-3-540-88693-8_61
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发表时间：
2008
期刊：
影响因子：
--
通讯作者：
Shuntaro Yamazaki
中科院分区：
文献类型：
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作者：
S. Narasimhan;S. Koppal;Shuntaro Yamazaki
主动视觉技术使用可编程光源，如投影仪，其强度可以在空间和时间上控制。我们提出了一个使用数字光处理（DLP）投影仪的快速主动视觉的广泛框架。DLP投影仪中的数字微镜阵列（DMD）能够以高速（106/s）切换镜像“打开”和“关闭”。然而，一个现成的DLP投影仪，有效地运行在低得多的速率（30-60Hz）通过发射较小的强度，随着时间的推移集成的传感器（眼睛或相机），以产生所需的亮度值。我们的主要想法是利用这种“时间抖动”的照明，由高速摄像机观察到。抖动对每个亮度值进行唯一编码，并且可以与几乎任何主动视觉技术结合使用。我们将我们的方法应用于五个众所周知的问题：(a)基于结构光的测距，(b)光度立体，(c)照明解复用，(d)高频保持运动模糊和(e)直接和全局场景组件的分离，实现了显著的性能提升。在我们所有的方法中，投影仪接收单个图像作为输入，而相机获取一系列帧。
Active vision techniques use programmable light sources, such as projectors, whose intensities can be controlled over space and time. We present a broad framework for fast active vision using Digital Light Processing (DLP) projectors. The digital micromirror array (DMD) in a DLP projector is capable of switching mirrors "on" and "off" at high speeds (106/s). An off-the-shelf DLP projector, however, effectively operates at much lower rates (30-60Hz) by emitting smaller intensities that are integrated over time by a sensor (eye or camera) to produce the desired brightness value. Our key idea is to exploit this "temporal dithering" of illumination, as observed by a high-speed camera. The dithering encodes each brightness value uniquely and may be used in conjunction with virtually any active vision technique. We apply our approach to five well-known problems: (a) structured light-based range finding, (b) photometric stereo, (c) illumination de-multiplexing, (d) high frequency preserving motion-blur and (e) separation of direct and global scene components, achieving significant speedups in performance. In all our methods, the projector receives a single image as input whereas the camera acquires a sequence of frames.