基于二维码匹配的指针式仪表读数识别方法

Pointer Instrument Identification by Using Two-Dimensional Code Matching

提出了一种基于二维码匹配的指针式仪表读数识别方法.该方法先实时采集高质量的仪表状态图像,同时获取二维码定位点信息以及与二维码相连接的数据库中存储的仪表类型信息,再根据二维码定位点信息对仪表图像进行快速倾斜校正,并利用二维码与仪表之间先验的几何位置关系快速提取图像中表盘所在的区域,最后根据获取的仪表类型信息,选择对应的仪表读数识别算法,以实现快速准确地识别仪表读数.实验结果表明:该方法能有效提高指针式仪表读数识别的准确率,尤其是对于复杂背景的仪表图像,该方法可用于电力系统中刻度均匀的指针仪表识别.

In this study,a novel identification method of the pointer instrument is proposed,which is implemented by using two-dimensional code matching information.Firstly,a high quality instrument state image and a two dimensional code image are acquired together.And the two-dimensional code location points and the type of instrument are obtained by matching the two dimensional code.Secondly,the instrument image is quickly corrected by the two-dimensional code location information.Then,using the geometric position relationship between the two-dimensional code and the instrument,the region of the dial plate in the instrument image is extracted quickly.Finally,according to the information of the instrument type,the corresponding instrument identification algorithm is selected to recognize the instrument readings quickly and accurately.The experimental results show that the proposed method can effectively improve the accuracy of the recognition of the pointer meter reading,especially for the instrument images of the complex background,which can provide an effective way for the pointer instrument identification in the power system.