一种提取单幅散斑干涉条纹图中心线的可靠方法

A New Method to Extract Fringe Skeletons from A Single Speckle Fringe Image

在光测力学中,如何从单幅散斑干涉条纹图中高精度地自动提取方向信息是一项较困难的工作。为了可靠地提取单幅散斑干涉条纹图的中心线,提出了一种简单可行的方法,该方法先通过平面拟合的方法来得到散斑干涉条纹图的条纹方向;然后在条纹方向上,利用条纹切面的倾斜度来提取散斑干涉条纹图的中心线。实验表明,此方法可靠、实现简单,对高噪声的散斑干涉条纹图非常有效。

In the field of optical deformation measurement, obtaining the fringe phase information from one speckle interferometry high accurately and automatically is a difficult problem. In this paper, a novel method is proposed to extract the skeletons precisely. We estimate the fringe orientation firstly and use a special filter to depress orientation noises. Then with the fringe orientations, the fringe slope angles are computed. In the slope angle map, great jumps of the slope intensity values occurred at fringe peaks and fringe valleys. At last, the fringe skeletons are easily extracted from the slope angle map. This method has been tested by real speckle fringe pattern images, and the results show that this method is efficient and robust for ESPI even with high speckle noise.