提出了一种快速可靠的4步相移编码解相位算法。通过对中心条纹的光强进行摄动,将编码信息加入到基本相移光栅中,使4幅基本相移图不但包含了相位场主值信息,还包含了解相位所需的编码信息。建立了摄动度函数描述相移图的摄动信息进而得到编码信息,解出完整的相位值。对摄动度函数的误差和噪声进行分析,提出方向滤波方法来消除噪声,极大地减少了编码信息的误判情况。仿真和实验证实了本算法的可行性。与传统相移法相比,解相位的速度和可靠性得到明显的提高。

A new fast and robust phase-codeing-unwrapping algorithm is proposed. By alternating the center area of fringes, the code information is added to the phase-shifting fringes, which include not only the primary phase information but also the code information for phase unwrapping. An alteration function is constructed to catch the code information and then give the unwrapped phase. The error and noise of the alteration function is discussed, then a new filter method called directional filtering is proposed to remove the noise, and the mistakes of phase unwrapping are depressed by this method. The simulation and experimental results show the feasibility of the new algorithm. The speed and dependability of the new algorithm are much better than those of the traditional method.