In the modern war,detection of the small target in the condition of complicated background is an urgent problem for infrared control and guide,it is also the key of improving weapon system capability.

This paper put forward a new method for vehicle plate location in complicated background, which well compromised both the accuracy and speediness by making use of the gray-level characteristics of characters and background on vehicle plate and its 2-D distribution regulation, sampling the key pixel, plotting grid and locating operation twice.

Aiming at the detection of the weak and point targets in complicated background a detection algorithm that is based on the operation of morphological filtering and frame-to-frame difference is proposed.

New background clutter rejection algorithm for dim-point target detection;

Background clutter had its impact on the target signal only through signal processing algorithm.

Based on the classic probability of edge(POE) metrics for quantifying background clutter,and the up-to-date research findings in human visual perception,a new method for modifying NVESD s classic human target acquisition performance wa.

Study on edge detection and target recognition in complex background;

Segmentation of linear object from complex background;

A method of extracting gesture from complex background;

A analysis was done for the relationship of the source of background doping and hardware conditions.