An image motion compensation technique based on real-time Line of Sight (LOS) tracking was proposed to solve the serious problem of image motion in the process of frame scanning infrared imaging originating from wingspan pendulum sweep. The compensation accuracy is up to ±0.005° and the compensation effect is no more than 1 pixel for the imaging system with an instantaneous Field of View of 100 μrad. This method enables high-frequency compensation of image motion derived from wingspan pendulum sweep, promoting the development of airborne infrared imaging technology with WFOV and high spatial resolution.