精确测量金属镀层工件表面缺陷的图像处理方法(英文)  

Image Processing of the Precision Measurement on Metal Surface Production Defect

作　　者：孔祥伟[1] 曲兴华[1] 张立平[1] 赵阳[1] 

机构地区：[1]天津大学精密测试技术及仪器国家重点实验室,天津300072

出　　处：《纳米技术与精密工程》2008年第4期267-271,共5页Nanotechnology and Precision Engineering

基　　金：国家自然科学基金资助项目(50575158);天津市自然科学基金资助项目(06YFJMJC03500)

摘　　要：设计了一套自动测量表面缺陷的系统.以面阵CCD采集图像,实现了对金属镀层工件表面图像的双面、高速、高分辨率测量.系统的图像处理采用模块化程序设计,方便实现工件表面精确测量的特定要求.通过两次分别选取阈值,采用经过改进的大津阈值分割法求取特征分割阈值时,能够十分理想地提取工件上的微小缺陷,实现了对金属工件表面的精确测量.该系统针对不同形状、不同镀层的工件表面可以调整LED照明光源的光强,在图像处理中可以调整去光圈和特征检测的灵敏度.通过方便调整系统的技术参数,满足工业现场的具体要求.以钕铁硼小型工件缺陷检测作为应用实例验证了该系统的可行性.An automatic measurement system for surface defect was designed. The system acquires metal part image by area CCD and realizes two-side, high speed and high resolution measurement. The image processing system introduces modularization programme to meet the particular requirement of the surface precision measurement. The threshold modulari- zation introduces a method by choosing the thresholds by two steps. The modified Ostu algorithm threshold method can in- spect inconspicuous defect easily, and realize the precision measurement. For different shapes and different plating coats of the production surface, the system can adjust the light intensity of LED lighting lamp-house, the sensitivity coefficient of wiping aperture and the defect detection in image processing. Therefore, it can adjust the technical parameters of the system and meet the exact requirement of the industry field. A practical application to the defect inspection of Nd-Fe-B small metal part validates the feasibility of the system.

关 键 词：图像测量 精密测量 图像处理 表面缺陷 

分 类 号：TQ153[化学工程—电化学工业]