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针对指针式仪表示值的自动判读,提出了一种适合实际应用的识别方法.该方法根据指针式仪表的表盘特征,通过坐标平移、坐标翻转和坐标系转换,实现圆形、扇形表盘图像转化为矩形表盘图像,利用矩形表盘图像进行由上至下的直线扫描获得刻度线及指针的位置信息,通过位置信息的比较确定仪表读数,该方法可以有效的解决圆扫描中扫描圆心偏心所带来的稳定性低的问题.实验结果表明该算法简单、稳定且识别误差小,对于精度为2.5的85C1型电压表,识别相对误差可达0.018%.“,”For the automatic judgment of analogy measuring instruments,a method which has practical application is brought forward. On the base of dial characters,the circular or fan-shaped image of dial is converted into the rectangular image by coordinates translation,coordinates reversal and reference frame conversation. The information of positions of graduations and pointer are attained through line searching from the top down in the rectangular image. Reading of the analogy measuring instruments is recognized by way of comparing the information of positions. The problem of low stability is brought by eccentricity of scanning circularity ,which is settled effectively by the method. The experiment results show low recognition error can be got by the method and the method is simple. The precision of 85C1 analogy measuring instrument is 2.5,which is used in the experiment. For this kind of instrument the relative error of recognition is keeping 0.018%.