摘要
A new error compensating five sample phase shifting algorithm which is insensitive to phase shift error is proposed to retrieve the phase distribution of a fringe pattern. It includes two steps. First, the linear phase shift error is estimated using four sample images. Then, the phase distribution is calculated with error corrected by using the phase shift error estimated in the first step. As the equations of error estimation and phase calculation are simple, this new algorithm is practical as well as effective. Computer simulations were carried out to verify the effectiveness of the algorithm. Results of two other well known error compensating algorithms are also presented, which show the new algorithm is the least sensitive to phase shift error.
提出一种五步移相算法 ,分两步进行相位计算 ,先估计实际步进移相的线性移相误差 ,再利用此移相误差估计值计算相位分布 .移相误差估计公式和相位计算公式简洁 ,算法简单易行 ,对线性移相误差和二次谐波的敏感度低 ,可基本消除线性移相误差对解调相位的影响 .对提出的算法进行仿真研究 ,同时给出了Hariharan五步算法、Surrel六步最小算法的仿真结果 ,结果表明本算法明显优于以上两种算法 ,可基本消除线性移相误差引起的相位偏移 .
