指针式仪表的自动读数是近年来的热门研究内容，但一直存在由成像畸变导致的误差较大的问题。
Automatic reading of analog meter has been a research hotspot recently, but the reading error caused by imaging distortion always exists.
介绍了一个数码管显示数字仪表表盘读数的自动识别系统。
An automatic recognition system for characters on numeric meter dial plate displayed by LED is introduced.
实验表明：该读数方法绝对误差为零，非常适合于高精度指针式仪表自动跟踪判读。
The experiment shows that the absolute error of the reading approach is zero, which is applicable to automatic tracking reading of high-precision meter very well.
接着，分析了采用低精度仪表自动判读方法对高精度仪表进行自动读数时，引入误差会增大高精度仪表的读数误差。
Secondly, the paper analyzes that importing error will increase reading error when the automatic recognition method of low-precision meters is used to recognize the reading of high-precision meters.
接着，分析了采用低精度仪表自动判读方法对高精度仪表进行自动读数时，引入误差会增大高精度仪表的读数误差。
Secondly, the paper analyzes that importing error will increase reading error when the automatic recognition method of low-precision meters is used to recognize the reading of high-precision meters.
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