Abstract:In order to solve the extraction and tracking problems of IR targets under complicated low altitude background,a horizon detection algorithm is proposed to exclude background of ground objects.Then above the horizon region,uses the edge detection,the threshold segmentation,the boundary search algorithm combined with the multi-frame image correlation as well as the continuity of target shape and motion to extract the target.Experiments show that the algorithm of this article is small amount of calculation,real-time,horizon can be effectively detected to remove low altitude background and the false target disturbance,may realize stable tracking and eventually completed a DSP hardware implementation.