Error-reduction methods for shape measurement by temporal phase unwrapping
Error-reduction methods for shape measurement by temporal phase unwrapping
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DOI：
10.1364/josaa.14.003188
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发表时间：
1997-12-01
影响因子：
1.9
通讯作者：
Saldner, HO
中科院分区：
文献类型：
--
作者：
Huntley, JM;Saldner, HO
时间相位展开是一种分析条纹图案的方法，其中测量每个像素处的条纹相位Phi并将其作为时间t的函数展开。我们提出了两种方法来提高总相位变化的信噪比，通过将数据从中间的相位值，第一涉及拟合的预期曲线的测量相位的历史，第二涉及傅立叶变换的相应的相量。这些方法的性能进行了比较实验，从条纹投影仪的数据的基础上的空间光调制器，和数值。它表明，最佳性能的傅立叶变换方法。使用第一种方法的最佳方式是Phi随着时间从其最大值到零呈指数下降;与原始时间展开算法相比，这在可靠性，准确性和计算时间方面都有显着改进。(C)1997年，美国光学学会。
Temporal phase unwrapping is a method of analyzing fringe patterns in which the fringe phase Phi at each pixel is measured and unwrapped as a function of time t. We propose two methods for improving the signal-to-noise ratio of the total phase change by incorporating data from the intermediate phase values, The first involves fitting the expected curve to the measured phase history; the second involves Fourier transformation of the corresponding phasors. The performance of these methods is compared both experimentally, with data from a fringe projector based on a spatial-light modulator, and numerically. It is shown that the optimum performance is given by the Fourier transform method. The best way to use the first method is with Phi decreasing exponentially with time from its maximum value to zero; this provides significant improvements in reliability, accuracy, and computation time compared with the original temporal unwrapping algorithm. (C) 1997 Optical Society of America.