基于图像识别的圆形指针式仪表读数矫正方法  

A method of reading correction for circular pointer instrument based on image recognition

作　　者：孙志周 田克超 刘璇 王亚菲 李健 杨国庆 SUN Zhizhou;TIAN Kechao;LIU Xuan;WANG Yafei;LI Jian;YANG Guoqing(Robotics Department,State Grid Intelligence Technology Company Limited,Jinan 250101,China;Operation and Maintenance Department,Guangzhou Power Supply Bureau of Guangdong Power Grid Company Limited,Guangzhou 510641,China)

机构地区：[1]国网智能科技股份有限公司机器人事业部,山东济南250101 [2]广东电网有限责任公司广州供电局运维部,广东广州510641

出　　处：《山东理工大学学报（自然科学版）》2022年第4期71-75,共5页Journal of Shandong University of Technology:Natural Science Edition

摘　　要：针对变电站巡检过程中拍摄的圆形仪表图像偏转问题,提出了基于图像识别的圆形指针式仪表读数矫正方法。将机器人在巡检过程中采集的圆形指针式仪表图像使用数字图像处理技术进行预处理,包括滤波去噪、形态学处理等;在表盘区域内,选择相应关键点并使用五点法拟合椭圆,定位出待处理的表盘区域和表盘中心;计算表盘中心和指针中心之间的距离并根据所获得的距离矫正指针的读数,输出指针的最终正确读数。实验结果表明,与直接用Hough变换算法相比,该算法能够实现读数的自动矫正,算法复杂度低、速度快、正确率达到95.4%,满足实际需求,为实现站内设备全覆盖检测提供了技术支撑。Aiming at the problem of deflection of circular instrument image taken during substation inspection,a reading correction method based on image recognition was proposed.The image of the circular pointer instrument collected by the robot in the inspection process was preprocessed by digital image processing technology,including filtering denoising,morphological processing and so on.The corresponding key points of circular meter image were selected and the five point method was used to fit the ellipse and locate the dial area and dial center.The distance between the center of the dial and the center of the pointer was calculated.According to the obtained distance,the reading of the pointer was corrected and the final correct reading of the pointer was output.The experimental results show that compared with the direct Hough transform algorithm,the algorithm can realize the reading correction and has the advantages of low complexity,fast speed and high accuracy of 95.4%,which can meet the real-life needs and prodvide technical support for realizing full coverage detection of equipments in the station.

关 键 词：图像识别 偏转仪表图像 椭圆拟合 Hough直线检测 读数矫正 

分 类 号：TB532.1[理学—物理] TB553[理学—声学]