光学学报, 2009, 29 (2): 370, 网络出版: 2009-02-23
面向物体表面测量的四步相移光解码技术研究
Study on Four-Step Phase-Shifting Decoding Algorithm for Three-Dimensional Profilometry
摘要
精确高效的相位解码在非接触光学测量中有着重要的作用, 在总结传统算法的基础上,提出一种新的相移光解码算法。该算法是以四步相移为基础,对初始的包裹相位图使用残差检测理论,检测、提取、标志出残差点,然后使用一种新的相位质量图指导剩余残差点的检测,为了使质量图中残差点的检测达到最优,对质量图进行低通滤波、锐化残差编码点,尽量使残差点能完全检测出来,并进行残差平衡处理,最终选取一个种子点使用洪水算法实现整张编码图的解码。实验结果显示该相移光解码算法能自动避开不连续区域,得到较高质量的编码结果。
Abstract
Accurate and efficient phase decoding algorithms play an important role in noncontact optical phase-measurement. This paper develops a new phase-shifting decoding algorithm based on analysis of the traditional method. At first, four-step phase-shifting method is used to get the unwrapping phase, The residues theory is used to check the residues. Then a new reliability ordering map is used to guide to check rest of the residues. Low-pass filter algorithm is used to get the optimum check results. At last we place the branch cuts to balance all the residuals and decode the whold image by flood algorithm. Experimentations show that the proposed optical decoding algorithm is effective and robust.
谢捷如, 崔海华. 面向物体表面测量的四步相移光解码技术研究[J]. 光学学报, 2009, 29(2): 370. Xie Jieru, Cui Haihua. Study on Four-Step Phase-Shifting Decoding Algorithm for Three-Dimensional Profilometry[J]. Acta Optica Sinica, 2009, 29(2): 370.