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.
针对CCD成像时中间亮两边暗的畸变特点，用双线性插值的方法对图像进行灰度校正。
According to the imaging character of CCD, a new method to calibrate the distortion image is brought forward.
本文以理想针孔成像模型为基础，对CCD摄像机的径向畸变问题进行了系统研究。
This paper is based on ideal pin-hole imaging model and researches the distortion problem of CCD camera.
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