Automatic reading of analog meter has been a research hotspot recently, but the reading error caused by imagingdistortion 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。
2
According to the imaging character of CCD, a new method to calibrate the distortion image is brought forward.
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。
3
In the paper, the special CCD satellite-imaging model is established based on imaging principle of CCD push-broom satellite and the distortion law of satellite images is also discussed.