Friedrich-Schiller-University Jena, Institute of Applied Optics, Fröbelstieg 1, 07743 Jena, Germany. martin.schaffer@uni‑jena.de
Opt Lett. 2011 Aug 15;36(16):3097-9. doi: 10.1364/OL.36.003097.
Many three-dimensional (3D) shape measurement techniques in stereophotogrammetry with temporal coded structured illumination are limited to static scenes because the time for measurement is too long in comparison to the object speed. The measurement of moving objects result in erroneous reconstructions. This is apparent to reduce measurement time to overcome this limitation, which is often done by increasing the projection rate for illumination while shrinking the amount of images taken for reconstruction. The projection rate limits most applications in its speed because digital light processing (DLP) projectors, which are widely used, bring a limited projection rate along. Our approach, in contrast, does not take a DLP. Instead we use laser speckles as projected patterns which are switched using an acousto-optical deflector. The projection rate is 10× higher than what the fastest stripe projection systems to our knowledge achieve. Hence, we present this uncommon but potential approach for highspeed (≈250 3Dfps= [3D measurements per second]), dense, and accurate 3D measurements of spatially separated objects and show the media that emphasizes the ability of accurate measurements while the objects under testing move.
在时编码结构光照立体摄影术中，许多三维（3D）形状测量技术由于测量时间与物体速度相比过长，因此仅限于静态场景。测量移动物体的结果会导致错误的重建。为了克服这一限制，明显的方法是减少测量时间，这通常通过增加照明的投影率同时减少用于重建的图像数量来实现。由于广泛使用的数字光处理（DLP）投影仪的投影率限制了大多数应用，因此投影率限制了大多数应用。相比之下，我们的方法不采用 DLP。相反，我们使用激光散斑作为投影模式，使用声光偏转器切换这些模式。投影率比我们所知的最快条纹投影系统高 10 倍。因此，我们提出了这种不常见但有潜力的方法，用于对空间分离的物体进行高速（≈250 3Dfps=[每秒 3D 测量次数]）、密集和精确的 3D 测量，并展示了强调在测试对象移动时进行精确测量能力的媒介。
