基于横向剪切的四向最小二乘相位解包裹算法

为了解决相位变换过快导 致相位离散梯度不连 续及解包裹中欠采样的出现,本文将横向剪切干涉技术引入到四向最小二乘相位解包裹算法 中。通过对包裹相位 建立二维复光场,对复光场进行剪切,一方面可以排除相位截断的干扰,另一方面剪切的引 入可以提高算法对严 重包裹相位的处理能力。实验结果表明,本文算对恢复相位信息有较好的 效果,同时具有四向 最小二乘的抑制误差传递的优点,且适合于对部分区域变化过大的相位进行解包裹。

Four directions least-square phase unwrapping algorithm based on lateral shearing interferometry

The reconstructed optical field phase of speckle interference fringes generally has high spatial variation frequency.However,the space-band width is so limited that it is easy to int roduce undersampling and to cause the existence of massive unreliable data points in the wrapped phase,which increas es the difficulty of phase unwrapping algorithm.This paper introduces the principle of shearing interferometry into f our directions least-square phase unwrapping algorithm by reconstructing two-dimensional optical field for the wr apped phase,in order to reduce the influence of discontinuity of phase discrete gradient and the impact of undersam pling.On one hand,the disadvantage of the phase truncation can be eliminated.On the other hand,the ability of proc essing the wrapped phase can be improved.Related experiments are carried out to verify the algorithm.The result s indicate that this algorithm could suppress the error transfer effectively.It is suitable for phase unwrapping of s erious wrapped regions and it has better results than the original algorithm.