| The main contents of this paper from the National Science and Technology Support Project which is called far-reaching sea surface distress target airborne infrared search and positioning technology.The goal of this project is to develop a long-range dual-band high-resolution infrared search system,which can realize dual-band,long-distance and high-resolution infrared search.And the infrared search system can quickly identify,locate and track the distress target of the sea.In this paper,we mainly study the tracking technology of target in the sea seam based on infrared image.We study two algorithms in this thesis,which are target tracking based on PI control and fast target retrieval based on spatial location information.In order to keep the target detected near the center of the image,the optimal output angle of a two-dimensional turntable is controlled by the target tracking algorithm based on PI control.The optimal output angle is based on the calculation of the PI control algorithm in this paper.In this way,it can be ensured that the target can be tracked steadily and as much as possible to avoid the phenomenon of overshoot.The target in the infrared image is calculated by the other researchers of the project group by the target detection algorithm.The algorithm of fast target retrieval based on spatial location information uses the principle of coordinate transformation.First of all,transform the position information of the target in the previous image and the position information of the current camera into two coordinates in the global coordinate system.Then,determine the angle between the camera and the target using the method of determining a straight line at two points in space.Finally,adjust camera angle by controlling the photoelectric stabilized pod to make the target quickly return to the image field of view.The two algorithms combined together can achieve a sustained and stable tracking effect to the target. |
