相位去包裹误差校正算法

A new error-correcting method for phase-unwrapping

实际干涉计量中各种干扰因素的存在,使得包裹相位图中可能存在噪声、低调制点或散斑等误差点。在用逐行逐列扫描法进行去包裹时,当碰到这些误差点时,误差就会沿着去包裹方向扩散,在去包裹相位图上形成“拉线”现象。针对去包裹误差扩散的原因,结合对相位图的预处理,提出了简单有效的相位去包裹误差校正算法,用这种方法去包裹时并不用避开误差点,而是在去包裹后进行误差校正,可以有效地解决去包裹误差扩散问题,消除“拉线”现象。计算机仿真和实验结果证明了该算法可以快速、准确地进行去包裹操作。

Many factors, such as noise, speckles and low modulation in wrapped phase make the unwrapping procedure complicated and path-dependent. The traditional scanning algorithm will propagate errors along the predefined path to the boundary. Based on the scanning algorithm, a new error-correcting method, which is combined with filtering, is proposed. This method can simply eliminate the propagation of errors after phase unwrapping without avoiding error areas. Also, the results of the simulation and experiment prove its effectiveness.