基于面阵CCD的双边跟随式带钢测宽仪设计

Design of Bilateral Tracking Width Gauge for Strip Steel Based on Area Array CCD

为解决现有带钢宽度实时检测技术检测精度不高的问题,设计一种基于面阵CCD(电荷耦合器件)的双边跟随式带钢测宽仪。采用面阵CCD相机采集带钢边缘图像,减小边缘成像误差;针对带钢高速运动过程中上下抖动较大的情况,采用双边跟随式的方法使相机跟随带钢边缘移动,减小面阵CCD相机视场角误差;采用大小双视场ROI(感兴趣区域)差分边缘检测算法检测带钢边缘,减小因铁屑掉落和带钢边缘突变产生的误差。现场检测结果表明:设计的带钢测宽仪可对边缘不平整、上下抖动较大的带钢进行有效检测,且能有效避免铁屑掉落和边缘突变带来的误差;双视场ROI差分边缘检测算法精度可达0.055 mm,算法帧率达46 F/s,宽度总体精度可控制在1 mm以内,测量帧率达20 F/s,满足高精度与实时性检测的要求。

In order to solve the problem of low accuracy of strip width real-time detection technology,a bilateral tracking strip width gauge based on area array CCD(charge coupled device)was designed.In order to reduce the edge imaging error,the area array CCD camera was used to collect the edge image of strip.In view of the large up-down jitter of strip during high-speed movement,a bilateral tracking method was adopted to make the camera follow the edge of strip and reduce the field of view error of area array CCD camera.Differential edge detection algorithm based on ROI(region of interest)of large and small field of view was used to detect strip edge,which could reduce the error caused by iron chip dropping and strip edge mutation.Field test results show that the designed strip width gauge can detect strips with uneven edges and big up-down jitter,and can avoid the errors caused by iron chip dropping and edge mutation effectively.The accuracy of ROI differential edge detection algorithm with large and small dual field of view can reach 0.055 mm,the frame rate of the algorithm can reach 46 F/s,the overall width accuracy can be controlled within 1 mm,and the measurement frame rate can reach 20 F/s,which meets the requirements of high precision and real-time detection.