Method for realizing projective distortion correction based on three-dimensional reconstruction of edge lines

The invention discloses a method for realizing projective distortion correction based on three-dimensional reconstruction of edge lines, and belongs to the field of image correction in digital image processing. According to the key point, a promotional cylindrical model with a certain universality is built for a geometric shape of a bent book page; a basic principle is that firstly the edge linesof the book page in a bent book page image are extracted and then a three-dimensional shape of the edge of the book page in the book page image is restored through a geometric imaging theory accordingto simple and easily obtained parameters such as an actual book page height, a shooting height, a shooting focal distance and the like, so that a real distance from any point on the edge lines of thebent book page in the image to a middle seam starting point of the book page is obtained; and further, on the promotional cylindrical model, a simple and convenient straight line linear interpolationmethod is directly adopted