The homography between corresponding matching windows can be approximated an affine model.

两幅图像中相应特征点邻域窗口之间的单应映射可以用仿射变换模型来近似.

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It is therefore concluded that a projection matrix can be computed through homography under certain condition.

通过这个原理就可以推导出投影矩阵在满足一定条件下可由单应矩阵得到.

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