基于双三次插值和高斯拟合的光条中心亚像素提取方法  

An extraction method for the subpixel center line of line structure light strip

作　　者：贺强旅 朱艳春[1] 李子良[1] 李小松[1] HE Qianglyu;ZHU Yanchun;LI Ziliang;LI Xiaosong(Taiyuan University of Science and Technology,Taiyuan 030024,China)

机构地区：[1]太原科技大学,太原030024

出　　处：《激光杂志》2024年第6期100-105,共6页Laser Journal

基　　金：山西省基础研究计划面上项目(No.202203021211208);山西省重点研发计划项目(No.202102020101005);国家自然基金面上项目(No.52274389)。

摘　　要：针对结构光三维测量的高精度要求,提出一种基于双三次插值和高斯拟合的激光线条亚像素提取方法。该方法首先对光条图像进行感兴趣区域提取、高斯滤波等前处理,其次用形态学方法细化激光线条得到初始中心点,然后使用五点拟合法得到光条法线方向,在光条法线方向上取亚像素的拟合点,利用双三次插值得到亚像素坐标的像素值,最后进行高斯拟合,到光条亚像素中心。实验结果表明,算法平均精度值为0.389147像素,消耗时间为0.056 2 s,具有较高的提取精度和稳定性。To meet the high precision requirements of structured light 3D measurement,a subpixel extraction method for laser stripes based on cubic spline interpolation and Gaussian fitting is proposed.Preprocessing including re-gion of interest extraction and Gaussian filtering was first performed on the laser stripe images.The laser stripes were then thinned to obtain the initial center points using morphological methods.The normal direction of the laser stripes was obtained using the five-point fitting method.Fitting points were taken at subpixels in the normal direction of the laser stripes.The pixel values of subpixel coordinates were obtained by cubic spline interpolation.Finally,Gaussian fitting was performed to obtain the subpixel centers of the laser stripes.Experiments show that compared with the previ-ous algorithm,this method has higher extraction accuracy and stability.

关 键 词：线结构光 中心线提取 亚像素坐标 高斯拟合 双三次插值 

分 类 号：TN249[电子电信—物理电子学]