基于图像测量技术的复杂工件自动检测系统研究  

Research on the Automatic Measuring System Based on Image Measuring Technology

作　　者：孙双花[1] 曲兴华[1] 晏彧[1] 张立平[1] 叶声华[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：《制造技术与机床》2007年第11期16-20,共5页Manufacturing Technology & Machine Tool

基　　金：国家自然科学基金专项基金(50327501和50575158)

摘　　要：汽车喷油器底座是一种具有强反射表面的由金属铸造冲压而成的复杂工件,要求对其内径尺寸进行精密测量。设计了一种适于背向照明的LED光源,使被测边缘能够清晰地体现在测量图像上;提出了一种新的圆的边缘提取算法,完成了圆的快速检测;实现了边缘的亚像素快速定位,提高了测量精度。实验结果表明,系统对工件进行在线测量的精度优于7μm,重复性优于2μm,测量速度为2件/s。The base of injector is a complex workpiece with a strong reflection surface fabricated by metal casting and stamping, and precision measurement of its interior diameter size is critical for the quality control. A back illumination scheme using LED is proposed, so that the edge can be clearly detected in the measurement image. To realize the fast localization of sub-pixel edge, a novel round edge-extracting algorithm is developed. The experimental results demonstrate that the online measurement accuracy precision is better than 7 μm with repeatability accuracy better than 2μm. The measurement speed is 2 pieces/second.

关 键 词：图像测量技术 强反射表面 自动检测 LED光源 亚像素 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]