Sjödahl M
Appl Opt. 1997 May 1;36(13):2875-85. doi: 10.1364/ao.36.002875.
Electronic speckle photography is an accurate, easy-to-use, video-based technique for the analysis of two- and three-dimensional deformation fields and in-plane strain fields, based on numerical cross correlation. Through the use of statistical optics, simulated speckle patterns, and experiments the accuracy in electronic speckle photography was found to depend on correlation, speckle size, window size, and correlation filter. The estimated correlation was found to be the combined effect of three mutually competing factors because of classical speckle correlation, subimage overlap, and displacement gradients. In many applications white-light speckle patterns provide a more accurate estimate of the displacement field than do laser speckle patterns.
电子散斑摄影是一种基于数字互相关的精确、易用的视频技术，用于分析二维和三维变形场以及面内应变场。通过统计光学、模拟散斑图案和实验发现，电子散斑摄影的精度取决于相关性、散斑大小、窗口大小和相关滤波器。由于经典散斑相关性、子图像重叠和位移梯度，估计的相关性是三个相互竞争因素的综合效应。在许多应用中，白光散斑图案比激光散斑图案能更准确地估计位移场。
