Zhou Pei, Zhu Jiangping, Su Xianyu, You Zhisheng, Jing Hailong, Xiao Chao, Zhong Min
Appl Opt. 2017 Apr 10;56(11):2995-3003. doi: 10.1364/AO.56.002995.
Three-dimensional (3D) acquisition of an object with modest accuracy and speed is of particular concern in practice. The performance of digital sinusoidal fringe pattern projection using an off-the-shelf digital video projector is generally discounted by the nonlinearity and low switch rate. In this paper, a binary encoding method to encode one computer-generated standard sinusoidal fringe pattern is presented for circumventing such deficiencies. In previous work [Opt. Eng.54, 054108 (2015)OPEGAR0091-328610.1117/1.OE.54.5.054108], we have developed a 3D system based on this encoding tactic and showed its prospective application. Here, we first build a physical model to explain the mechanism of how to generate good sinusoidality. The phase accuracy with respect to the conventional spatial binary encoding method and sinusoidal fringe pattern is also comparatively evaluated through simulation and experiments. We also adopt two phase-height mapping relationships to experimentally compare the measurement accuracy among them. The results indicate that the proposed binary encoding strategy has a comparable performance to that of sinusoidal fringe pattern projection and enjoys advantages over the spatial binary method under the same conditions.
在实际应用中，以适度的精度和速度对物体进行三维（3D）采集尤为重要。使用现成的数字视频投影仪进行数字正弦条纹图案投影时，其性能通常会因非线性和低切换速率而大打折扣。本文提出了一种二进制编码方法，用于对一个计算机生成的标准正弦条纹图案进行编码，以克服此类缺陷。在之前的工作[《光学工程》54, 054108 (2015)OPEGAR0091 - 328610.1117/1.OE.54.5.054108]中，我们基于这种编码策略开发了一个3D系统，并展示了其潜在应用。在此，我们首先建立一个物理模型来解释生成良好正弦性的机制。还通过仿真和实验对相对于传统空间二进制编码方法和正弦条纹图案的相位精度进行了比较评估。我们还采用两种相位 - 高度映射关系来通过实验比较它们之间的测量精度。结果表明，所提出的二进制编码策略与正弦条纹图案投影具有相当的性能，并且在相同条件下优于空间二进制方法。
