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
贺强旅 1朱艳春 1李子良 1李小松1
作者信息
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.
Abstract
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Key words
linear structured light/center line extraction/subpixel coordinates/gaussian fitting/bicubic interpo-lation引用本文复制引用
基金项目
山西省基础研究计划面上项目(202203021211208)
山西省重点研发计划(202102020101005)
国家自然科学基金面上项目(52274389)
出版年
2024
NETL
NSTL
万方数据