全息散斑条纹的提取及图像处理

The extraction of speckle fringes from holo-specklegram and its image processing

介绍了一种新的全息散斑条纹的提取方法.理论和实验表明:对全息散斑底片逐点再现时,两伴生亮斑条纹是全息散斑底片一级衍射光的杨氏干涉条纹,与中央的杨氏条纹是一致的,有较高的条纹对比度且没有背景光晕的影响.利用计算机数字图像处理技术对伴生散斑条纹进行处理,定量测试了受静载物体的面内位移.

In this paper, a new method for extracting speckle fringes of a holo-specklegram is presented. It is proved theoretically and experimentally that when the interrogation of a holo-specklegram from point to point is used, the fringes in the two side lobes are the Young's interference fringes of the first-order diffraction in the holo-specklegram and is identical with the central Young' s fringes. The two side lobes fringes have high contrast and no effect of background halation. It is processed by using computer digit image processing technique and the in-plane displacement of a static load object is calculated quantitatively.