基于调制度位相展开的三维面形测量及其可视化

The 3-D Shape Measurement and Visualization Based on Modulation Analysis

在三维面形测量中,对复杂面形的处理位相展开仍然是十分困难的,所以极大地限制着测量精度和测量系统的自动化程度。通过多次实践, 提出一种在数字加权滤波和调制度分析基础上形成可靠性控制模板,并按调制度进行位相展开的方法。实现了频谱面的数字加权滤波,进一步对条纹质量进行分类排序。在不影响位相精度的情况下,保证了位相展开的可靠性,避开了复杂的极点连接工作,节省了处理时间。最后笔者给出了一个实验,实验结果证明了方法的可行性和有效性。

It is difficult to retrieve the complex object shape by using traditional two-dimensional phase unwrapping algorithm, so the levels of automatization and accuracy of measuring are confined. We present an improved phase unwrapping technique in Fourier transform profilometry, which is based on digital weighted filter and modulation analysis. The processing is guided by magnitude of modulation, and the filter in frequency range is used to improve the sort order of fringe quality. In this way, the new method is considering both accuracy and reliability, avoiding the step of connecting poles and saving time. Finally, its feasibility and validity is proved by the experimental results of the 3-D shape measurement.