用曲线大窗口平滑散斑条纹图的方法研究

METHOD FOR SMOOTHING SPECKLE INTERFEROMETRYFRINGE-PATERNS IN BIG CURVE WINDOW

提出一种计算条纹方向的简单算法,以及通过条纹方向图获得沿条纹方向的曲线窗口并对散斑条纹图进行曲线大窗口滤波的方法．实验表明此方法较好地消除了散斑条纹图的噪声,同时尽量减小了对条纹结构的损害．为从单幅散斑条纹图中应用条纹中心线法或全灰度法进一步提取相位场的后处理,奠定了良好的基础．

In the field of optical deformation measurement, it is a hotspot how to remove thespeckle noise from one speckle inerferometry fringe pattern, and observe the full field fringe phaseinformation high-accurately and automatically. In this paper, a simple method of estimating fringeorientation is presented. A curve window along the fringe curve is determined according a mapof fringe orientation, and the filter in a big curve window is applied to speckle interferometryfringe patterns. These methods are tested by real speckle fringe pattern and the results show thatthe speckle noise is removed efficiently with preserving the structural integrity of fringe. Thesemethods provide a basis for observing fringe phase from one speckle fringe pattern using fringeskeleton method or pure fringe gray level method.