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Due to the pose and Angle of camera, imaging plane and document plane in the camera imaging system, the document image obtained by the camera will be perspective projection instead of front view, which will have a negative impact on the later processing of text extraction and recognition. According to the principle of camera imaging system and rotation matrix, this paper proposes a virtual camera coordinate system which converts the real camera coordinate system into the front view through rotation matrix, and remaps the image pixels to realize the pose correction of the document image. In this paper, binocular camera is used to shoot the experiment, and the results show that the method is simple and feasible.