摘要
采用图像检测技术对轴类零件尺寸进行非接触检测,实现了动态测量。在获取零件图像后,采用Sobel算子完成对图像边缘的初步定位,在此基础上,通过对图像边缘的离散点作最小二乘曲线拟合,达到边缘的亚像素定位,基于精度分析,得出了误差最小时的尺寸求解方法。通过标定系数k的求解,计算出精确的零件尺寸。实验表明,该方法能有效地提高检测精度,在CCD摄像机分辨率为1392×1040,像元尺寸为4.65μm时,检测误差<±20μm。
Non-contact measurement of shaft component realizes dynamic measuring,which bases on image measurement technology.After the image of shaft is obtained,Sobel operator is used for preliminary locating to image edge,on basis of this,discrete points of image edge are fitted by least square method for achieving edge subpixel location.By precision analysis,size solution method is acquired when the error is minimal;after calibration coefficient k is gained,the component size is correctly calculated.By experiment,it shows that measurement precision is improved effectively and measurement error is less than ±20μm when resolution of CCD camera is 1392×1040 and its pixel size is 4.65μm.
出处
《工具技术》
2012年第3期85-87,共3页
Tool Engineering
关键词
轴类零件
非接触测量
SOBEL算子
最小二乘拟合
标定系数
shaft component
non-contact measurement
Sobel operator
least square fit
calibration coefficient
