Method and system for detecting and tracking moving object

The invention discloses a moving target detecting and tracking method based on a DSP (digital signal processor), and a system for realizing the method. The method comprises the following steps of: firstly, establishing a background model by using a method that an interframe difference is combined with a background difference aiming at a Y-component of an image; subsequently detecting a foreground moving target; establishing an initial target template; carrying out pyramid downsampling for two times on the target template and a video image to be tracked respectively so as to reduce resolution of the target template and the video image to be tracked. A particle group optimization algorithm is adopted on a top layer of a pyramid to position a tracked target; a diamond search method is adopted on a middle layer and a bottom layer of the pyramid to position the tracked target; and the target template is updated constantly along with change of the moving target during a process that the target is tracked, thereby r