橡胶密封圈几何尺寸图像检测技术研究

Research on Rubber Ring Geometric Dimensions Image Detection Technology

目前油冷散热器件密封圈尺寸检测使用万工显人工目测方法,工作强度高,测量数据稳定性差;针对这种情况,提出了使用万工显、CCD相机、光栅和计算机搭建自动测量系统,实现了密封圈几何尺寸的检测;采用CCD相机替代万工显的目镜,由光学系统将被测密封圈的边缘成像于CCD靶面上,数字图像通过USB口传入计算机,实现图像采集,由固定于测量平台的光栅尺读取平台移动数据;采集密封圈6幅边缘图像,同时把光栅读数读入计算机;经过中值滤波、阈值分割、边缘检测等图像处理方法,结合光栅读数,经过坐标转换,得到了同坐标系下的所有图像边缘坐标,所有边缘坐标数据采用最小二乘法拟合圆,得出密封圈的半径值;实验数据表明,CCD测量系统均方差为0.0001 mm,低于目测系统的均方差值0.0005 mm,CCD万工显测量系统测量数据稳定性好。

Now pepole visual detection of oil cooling radiator sealing ring size by universal tool microscope, which caused high working intensity, poor stability measurement data. In view of this situation, proposes the use of universal tool microscope, CCD camera, grating , and computer to set up automatic measuring system, the detection of the geometry size of the sealing ring is realized. Using CCD camera in- stead of universal tool microscope eyepiece, the edge of the sealing ring is imaged on the CCD target by the optical system, digital image pas- sed through USB port to computer, to achieve image acquisition. The Grating ruler fixed to the measurement platform and read platform mo- bile data. Capturing 6 pieces of seal ring edge image and reading grating ruler reading into the computer. After median filtering, threshold segmentation, image binarization, edge detection and other image processing methods, combined grating reading, through coordinate trans- formation, all the image edge coordinates are obtained in the same coordinate system, all edge coordinates data were fitted by the least square method and get the radius of the sealing ring. Experimental data show that the variance of the CCD measurement system is 0. 0001 mm, low- er than the visual inspection system, the data of CCD measurement system is stability.