Two-step rectification method for distortions caused by aircraft roll in push-broom hyperspectral images

Abstract

Aircraft roll is an important reason for geometric distortion of airborne push-broom hyperspectral images. A two-step rectification method is proposed to correct the geometric distortions of push-broom hyperspectral images caused by aircraft roll. According to the distortion characteristics of hyperspectral images, image distortion is mainly classified into two categories: high frequency distortion and large amplitude distortion. For high frequency distortion, the first-step correction is implemented by slide matching of segmented windows between adjacent scan lines. For large amplitude distortion, the second-step correction is achieved using ground control points and linear features between a reference map and an uncorrected image. Experimental results show that the proposed method can eliminate image distortion caused by aircraft roll effectively.