Multicamera phase measuring profilometry for accurate depth measurement
Multicamera phase measuring profilometry for accurate depth measurement
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DOI：
10.1117/12.720068
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发表时间：
2007-04
期刊：
影响因子：
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通讯作者：
Yongchang Wang;Kai Liu;Q. Hao;D. Lau;L. Hassebrook
中科院分区：
文献类型：
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作者：
Yongchang Wang;Kai Liu;Q. Hao;D. Lau;L. Hassebrook
结构光照明是指投射一系列图案的扫描过程，使得当从一个角度观看时，相机能够提取范围信息。最终，深度分辨率由投射的图案数量控制，这反过来又增加了目标对象必须保持静止的总时间。通过添加第二相机传感器，不仅可以实现环绕扫描，还可以减少实现一定程度的深度分辨率所需的图案数量。但是第二个摄像机也可以通过立体视觉技术和摄像机之间的三角测量而不是摄像机和投影仪之间的三角测量来重建3D表面。对于这两个任务，来自两个相机的点之间的对应关系是必不可少的。在本文中，我们开发了一种新的方法来找到两个相机之间的对应关系，使用时间复用照明模式和立体三角测量产生的相位信息。我们还分析了作为结构化图案的数量以及投影仪到相机的几何位置的函数的对应精度。
Structured light illumination refers to a scanning process of projecting a series of patterns such that, when viewed from an angle, a camera is able to extract range information. Ultimately, resolution in depth is controlled by the number of patterns projected which, in turn, increases the total time that the target object must remain still. By adding a second camera sensor, it becomes possible to not only achieve wrap around scanning but also reduce the number of patterns needed to achieve a certain degree of depth resolution. But a second camera also makes it possible to reconstruct 3-D surfaces through stereo-vision techniques and triangulation between the cameras instead of between the cameras and the projectors. For both of these two tasks, correspondence between points from two cameras is essential. In this paper, we develop a new method to find the correspondence between the two cameras using both the phase information generated by the temporal multiplexed illumination patterns and stereo triangulation. We also analyze the resulting correspondence accuracy as a function of the number of structured patterns as well as the geometric position of projector to cameras.