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

作　　者：杨福俊[1] 何小元[1] 王蕴珊[2] 

机构地区：[1]东南大学工程力学系,江苏南京210096 [2]山东大学物理与微电子学院,山东济南250061

出　　处：《光子学报》2005年第8期1257-1261,共5页Acta Photonica Sinica

基　　金：自然科学基金资助项目(10072017);国家高技术研究发展计划"863"资助项目(2002AA404140)

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.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 single fringe-pattern without the need of carrier fringes. The phase demodulation can be processed without assigning fringe orders and making distinction between a depression and an elevation. The method is applied to the study of transient events. Experimental results and a new adaptive weighted filter are presented to demonstrate the validity of the method.

关 键 词：相位解调 条纹分析 图像处理 自适应加权滤波 

分 类 号：O348.1[理学—固体力学] TP301[理学—力学]