基于双端预测和中心交点插值的线结构光中心提取  

Line structured light center extraction based on double terminal prediction and center intersection interpolation

作　　者：胡智滨 张爱军[1] 郭源 HU Zhibin;ZHANG Aijun;GUO Yuan(School of Mechanical Engineering,Nanjing University of Science and Technology,Nanjing 210094,China)

机构地区：[1]南京理工大学机械工程学院,南京210094

出　　处：《激光杂志》2025年第3期58-64,共7页Laser Journal

摘　　要：为提高线结构光条纹中心提取的精度与速度,提出了一种基于双端预测与中心交点插值的线结构光中心提取算法。首先,通过轮廓跟踪和连通域分析算法确定提取区域以加快计算速度,降低背景信息干扰。再利用灰度重心法进行中心提取,对提取结果进行曲线拟合。接着从线结构光条纹中心点向两端进行初步提取:计算提取点到拟合曲线的距离,以平均距离作为阈值,在距离大于阈值处采用双端预测。随后,利用块状主成分分析法计算出线结构光条纹每个位置的法线方向,并通过中心交点插值法得到插值点。最后,对插值点应用灰度重心法得到精确的线结构光条纹中心坐标。实验结果显示,所提算法在曲率变化较大处、强反光处都能较准确地提取线结构光条纹中心,在提取计算机模拟生成的线结构光条纹中心时,所提算法提取精度达到灰度重心法的64.1倍和Steger法的6.0倍,所提算法运行速度略慢于灰度重心法,是Steger算法的7.6倍。For purpose of improving the accuracy and speed of extracting fringe center of linear structured light,an algorithm based on two-terminal prediction and center intersection interpolation is proposed.Firstly,the extraction region is determined by contour tracking and connected domain analysis algorithm to speed up the calculation and reduce the interference of background information.The center was extracted by gray gravity center method,and the curves were fitted to the extracted results.Then,from the center point of the linear structured light fringe to both ends,the initial extraction is carried out:the distance from the extraction point to the fitted curve is calculated,and the average distance is taken as the threshold,and the two-terminal prediction is used when the distance is greater than the threshold.Then,the normal direction of each position of line structure light fringe is calculated by block principal component analysis method,and the interpolation point is obtained by central intersection interpolation method.Finally,the gray gravity center method is applied to the interpolation points to obtain the accurate fringe center coordinates of line structure light.The experimental results show that the proposed algorithm can accurately extract the fringe centers of linear structured light at places with large curvature changes and strong reflections.When extracting the fringe centers of linear structured light generated by computer simulation,the extraction accuracy of the proposed algorithm reaches 64.1 times that of the gray gravity center method and 6.0 times that of the Steger Algorithm,and the running speed of the proposed algorithm is slightly slower than that of the gray gravity center method and 7.6 times that of Steger algorithm.

关 键 词：线结构光 中心提取 双端预测 中心交点插值 灰度重心 

分 类 号：TN249[电子电信—物理电子学]