Automatic reading of analog meter has been a research hotspot recently, but the reading error caused by imaging distortion always exists.
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。
Several aspects were compared, such as accuracy, phenomenon, reading error, cost and the use level of reagent. Mixed solution method was superior to KI solution method.
混合溶液法的精密度、反应现象、读数误差、试剂用量及费用等方面均优于KI溶液法。
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.
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。
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