电子散斑条纹骨架线的自动提取

Auto pick-up of fringe skeletons in ESPI displacement measurement

应用电子散斑干涉方法测量试件的变形位移场时 ,条纹的骨架线对应位移场的等位移线 ,准确地提取相关条纹的骨架线是正确测量位移场的关键 .提出了基于条纹细化算法的条纹骨架线提取方案 ,并对细化后的条纹进行了修整处理 ,去除了桥连和分杈现象 ,最后对细化后的条纹进行了拟合处理 ,减小了测量误差 .经上述处理后获得了单位宽度的、比较光滑的条纹骨架线 .应用条纹骨架线提取方案 ,能够快速。

When the electronic speckle pattern interferometry (ESPI) is applied to the measurement of displacement fields, fringe skeletons are corresponding to the contours of displacement. Therefore, how to pick up fringe skeletons precisely is the key problem in ESPI displacement measurement. Based on fringe refinement algorithm, this paper puts forward a method to pick up fringe skeletons. After the skeletons are thinned, they are amended to eliminate bridgings and branches, and are fitted to a group of smooth, unit width lines. If methods in this paper are applied, the auto pick up of fringe skeletons can be done precisely and rapidly.