一种改进的轮廓术相位缠绕抑制方法
Improved method for phase wraps reduction in profilometry
摘要：
为了完全消除或大大减少2D包裹相位图中的相位包裹数，Gdeisat等人提出了一种将频谱向原点移动的算法。但是频谱只能移动整数，这意味着相位缠绕减少通常不是最佳的。另外，Gdeisat的方法在进行傅里叶变换、傅里叶逆变换、选择和移动光谱分量等过程中需要花费大量的时间。针对上述问题，提出了一种改进的消除或减小相位缠绕的方法。首先对相位图进行零填充，利用高分辨率确定投影条纹的载频，以此作为频谱的移动距离。然后在空间域实现频移。这样不仅可以在载波频率不是整数的情况下使频谱移动一个有理数，而且可以减少执行时间。最后通过实验验证了该方法的可行性。
英文摘要：
In order to completely eliminate, or greatly reduce the number of phase wraps in 2D wrapped phase map, Gdeisat et al. proposed an algorithm, which uses shifting the spectrum towards the origin. But the spectrum can be shifted only by an integer number, meaning that the phase wraps reduction is often not optimal. In addition, Gdeisat's method will take much time to make the Fourier transform, inverse Fourier transform, select and shift the spectral components. In view of the above problems, we proposed an improved method for phase wraps elimination or reduction. First, the wrapped phase map is padded with zeros, the carrier frequency of the projected fringe is determined by high resolution, which can be used as the moving distance of the spectrum. And then realize frequency shift in spatial domain. So it not only can enable the spectrum to be shifted by a rational number when the carrier frequency is not an integer number, but also reduce the execution time. Finally, the experimental results demonstrated that the proposed method is feasible.
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