光子学报, 2005, 34 (8): 1257, 网络出版: 2006-06-12
一种新的单幅条纹图的相位解调方法
A Novel Approach for Phase Demodulation from a Single Fringe Pattern
相位解调 条纹分析 图像处理 自适应加权滤波 Phase extraction Fringe analysis Digital image processing Adaptive weighted filter
摘要
基于非载波条纹图的条纹灰度分布的极值准确定位,提出了一种新的由单幅条纹图解调相位方法.该方法首先准确定位每个条纹灰度的极值包括最大和最小,再基于极值图将条纹的强度值分布线性地变换到-1和1之间,最后利用arcos反余弦取代传统的atan2反正切算法求出相位,结合极值图就能快速准确地解调出含有封闭条纹的条纹图相位.本方法仅用一幅条纹图,不需要传统的条纹定级和对分数级条纹插值与拟合,自动判别条纹相位变化的波谷,准确获得条纹相位分布.这一方法使光测法研究动态和瞬态问题成为可能,而不需引入载波法调制条纹.文中通过实例说明了本方法的处理过程.
Abstract
A new technique for phase demodulation from a single fringe-pattern image is presented in this paper. The method locates the extremes of fringes′ intensity distribution,and converts the intermediate gray-values into values between -1 and 1 using linear interpolation. Based on the extremes map,a wrapped phase distribution is demodulated from a single fringe-pattern and the phase values are computed by using an arcos mode rather than the traditional atan2 mode.Through the new method, wrapped phase values can be efficiently extracted from a singgle fringe-pattern without the need of carrier fringers.......
杨福俊, 何小元, 王蕴珊. 一种新的单幅条纹图的相位解调方法[J]. 光子学报, 2005, 34(8): 1257. 杨福俊, 何小元, 王蕴珊. A Novel Approach for Phase Demodulation from a Single Fringe Pattern[J]. ACTA PHOTONICA SINICA, 2005, 34(8): 1257.