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This graduation project mainly focuses on the gradual study of the rotation mode of the spot map, and applies the research results to the specific image rotation. The research contents include

Coordinate transformation principle, image edge detection and some contents of computer geometry. The rotation of some graphics is of great significance in the field of image registration.

Some graphic rotation methods include origin rotation, center rotation and arbitrary point rotation. The principle of rotation transformation of some graphic origin coordinates is used: first, what rotation matrix is obtained on the graph, and then the coordinates of each point are multiplied by the matrix to get the coordinates of the rotation point. The process of rotating the center of some graphs on the original image is to subtract the center coordinates from the coordinates of all points, and finally to get the coordinates of all points by coordinate transformation. The rotation method for adding any point in the center point diagram is the same as that for rotating the center point to the center point, but the coordinates of any point will change.

In the specific image rotation, the rotated image will have some deformation, the reason is that the simple point is that the pixel points become integers and some blank points are produced. Improve the calculation of image rotation quality and blank filling of interpolation points in the process of rotation.