光笔式视觉坐标测量中的亚像素图像处理方法  

Subpixel Image Processing Method in Light Pen Vision Coordinate Measurement

作　　者：李保章[1] 黄风山[1] 

机构地区：[1]河北科技大学机械电子工程学院,石家庄050054

出　　处：《半导体光电》2012年第1期141-144,共4页Semiconductor Optoelectronics

基　　金：国家自然科学基金项目(51075119);河北省自然科学基金项目(E2010000868)

摘　　要：介绍了一种光笔式便携三坐标视觉测量系统,提出了被测特征点像面坐标的提取方法。依据数字图像处理理论并结合测量系统中被测特征点的成像特点,给出了图像预处理过程及实际处理结果;采用基于灰度质心法的径向截面扫描法对图像边缘进行亚像素级检测;应用平面内任意位置椭圆的最小二乘曲线拟合法对椭圆形光斑中心的像面坐标进行了提取,实验结果表明该方法的提取精度为0.1个像素。A light-pen portable 3D coordinate vision measurement system is introduced,and a method for picking up the image coordinates of the measured feature points is proposed.Based on the theory of digital image processing and combining with the image characteristics,the practical methods and results of image preprocessing are presented.Applying the radial section scanning method based on gray centroid,the image edges are tested with a subpixel precision.The image coordinates of ellipse spots＇ centers are picked up using the Least Square fitting method of an ellipsis which is located arbitrarily in a plane,and experimental results show that the prediction of this method can reach 0.1 pixel/subpixel.

关 键 词：图像处理 视觉测量 光笔 亚像素 曲线拟合 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]