Method for eliminating image rotation caused by 45 degree scanning lens

The method of eliminating image rotation caused by 45 deg scanning lens is suitable for eliminating image rotatino in case of faulted K lens and no K lens. The method includes at least the folloiwng steps: rotating computer input image; calculating imaging relationship in computer; deducing the imaging process of the optical instrument from the basic reflection law; obtaining the mapping relationship between the image rotating coordinate and rotation elimianting image coordinate; eliminating rotation of the whole image frame; and output rotation eliminated image; circular execution. For faulted K lens, there include also the steps of obtaining K lens angle and inputting to computer. The present invention can eliminate rotation of image, simplify optical path of remote sensing instrument, raise the reliability of instrument in satellite.