Wang Yuwei, Liu Lu, Wu Jun, Chen Xiangcheng, Wang Yajun
Appl Opt. 2020 May 10;59(14):4279-4285. doi: 10.1364/AO.391387.
Binary coding methods have been widely used for phase unwrapping. However, traditional temporal binary coding methods require a sequence of binary patterns to encode the fringe order information. This paper presents a spatial binary coding (SBC) method that encodes the fringe order into only one binary pattern. Each stripe of the sinusoidal phase-shifting patterns is corresponding to an -bit codeword of the binary pattern. A robust stripe-wise decoding scheme is also developed to extract the -bit codeword, then fringe order can be determined, and stripe-wise phase unwrapping can be performed. Experiment results confirm that the SBC method can correctly recover the absolute phase of measured objects with only one additional binary pattern.
二进制编码方法已被广泛用于相位展开。然而，传统的时间二进制编码方法需要一系列二进制图案来编码条纹级次信息。本文提出了一种空间二进制编码（SBC）方法，该方法将条纹级次仅编码为一个二进制图案。正弦相移图案的每条条纹对应于该二进制图案的一个n位码字。还开发了一种稳健的逐条纹解码方案来提取n位码字，然后可以确定条纹级次，并进行逐条纹相位展开。实验结果证实，SBC方法仅用一个额外的二进制图案就能正确恢复被测物体的绝对相位。
