中国激光, 2018, 45 (10): 1004004, 网络出版: 2018-10-12
数字散斑三维重建中散斑特性分析 下载: 1210次
Analysis of Speckle Characteristics in Three-Dimensional Reconstruction Based on Digital Speckle
测量 三维测量 数字散斑 相关计算 二值散斑 亚像素 measurement three-dimensional measurement digital speckle correlation calculation binary speckle subpixel
摘要
详细介绍了基于数字散斑相关技术的三维重建方法, 包括双目立体视觉基本原理以及散斑三维重建基本流程。重点分析了整像素对应点查找方法以及基于牛顿-拉弗逊迭代的亚像素插值算法, 实现了散斑亚像素级三维重建。针对数字散斑相关计算模型, 分析了影响相关系数的因素, 并围绕相关系数计算和亚像素同名点插值精度两方面重点分析了二值随机散斑和灰度随机散斑的三维重建效果。通过设计不同尺寸颗粒的散斑图案和采用不同大小的相关计算窗口, 分别对平面陶瓷板和陶瓷标准球进行了三维重建精度分析。实验结果表明, 二值散斑能获得更高的重建精度。
Abstract
The three-dimensional reconstruction method based on digital speckle correlation technique is introduced in detail, including the basic principle of binocular stereo vision and the three-dimensional reconstruction process. The integer pixel search method and the subpixel interpolation algorithm based on Newton-Raphson iteration are emphatically analyzed, and the subpixel-level reconstruction is realized. According to the correlation model, the factors affecting the correlation coefficients are analyzed. Three-dimensional reconstructions by the binary and 8 grayscale speckles are discussed in terms of coefficient calculation and subpixel location precision. The ceramic plate and the ceramic standard ball are reconstructed by patterns with different speckle sizes and correlation region sizes in the experiments. Test results demonstrate that the reconstruction by the binary speckle has a better performance.
汤其剑, 刘欣运, 吴禹, 刘晓利, 刘梦龙, 李清泉, 彭翔. 数字散斑三维重建中散斑特性分析[J]. 中国激光, 2018, 45(10): 1004004. Tang Qijian, Liu Xinyun, Wu Yu, Liu Xiaoli, Liu Menglong, Li Qingquan, Peng Xiang. Analysis of Speckle Characteristics in Three-Dimensional Reconstruction Based on Digital Speckle[J]. Chinese Journal of Lasers, 2018, 45(10): 1004004.