In order to enable ordinary recognition software to recognize the digital document images, it is necessary to carry out their geometric rectification. 为了使普通的识别软件能够对数码相机等拍摄的文档图像进行识别，有必要对其进行几何校正。
Of all the methods for geometric rectification of remote sensing imagery, the Collinearity Equation Model is usually considered to have the best accuracy. 摘要在遥感影像几何校正方法中，通常认为精度最高的是共线方程模型。
