Compared with the existed 2-step algorithms, the proposed QSF algorithm reveals two advantages: First, it reduces the influence of the inaccurate estimation of background intensity on the phase retrieval quality, thereby improving the effectiveness in 2-step PSI. Second, it releases the restriction of the required number of fringes in the interference pattern, because the blind phase shift estimation procedure in the proposed QSF algorithm is not directly related to the fringes number.

中文翻译：

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基于干涉图二次空间滤波的两步相移算法


与现有的2步算法相比，所提出的QSF算法具有两个优点：首先，它减少了背景强度估计不准确对相位检索质量的影响，从而提高了2步PSI的有效性。其次，它释放了对干涉图案中所需条纹数量的限制，因为所提出的QSF算法中的盲相移估计过程与条纹数量不直接相关。