A Modified Canny Algorithm for Detecting Sky-Sea Line in Infrared Images

Detecting sky-sea line is very important to identify targets for missile imaging guidance. As traditional Canny algorithm gives out too many edges in infrared images with sky-sea background, an modified Canny algorithm is suggested to detect the sky-sea line in this paper In this algorithm, the Canny method is combined with a median filter, its two thresholds are designed to be adaptive based on the properties of these infrared images. A criterion is set up to distinguish the sky-sea line from other objects in an image. The complete algorithm for locating the sky-sea line is given