Rectification Methods on Distortion of Digital Airborne Images

Abstract. This paper mainly describes the rectification method of digital airborne image distortion. First, according to the digital sensor model, the mathematical model of airborne image is built up for processing the geometrical data of image, which is also the key for digital rectification. Then, the principle of digital rectification is explained through discussing the direct method and the indirect method in detail. Because the coordinates of image points are not usually set in the center of pixel, the bilinear interpolation is used for gray resampling in the indirect method, which can obtain the rectified images with high accuracy. Finally, according to the theory and the method provided in the paper, program of digital airborne image rectification is coded by Visual C++ language. On the analysis of experimental results between direct method and indirect method, the rectification method for distortion of digital airborne image is proved to be practical and correct in the real applications.