In order to solve the problems which are the real-time is low and false alarm is high to the infrared detector system in
small and weak linear target. According to the detailed analysis of image formation system, the methods of the liner
characterized by rapid detection algorithms and the complex morphology character detection algorithm are bring up. It
can be used to test the small and weak linear target, and the algorithm processes and results are given. As one of the
assistant algorithms, these two algorithms are used in the infrared detector system, and the real-time of system and the
detection accuracy of target are improved obviously.