运动目标的检测与跟踪在许多领域有广泛的应用，它是应用视觉研究的焦点之一。

Motion target detection and tracking is one of the most important issues in applied vision research due to its wide applications in many fields. In this paper, a difference image based motion detection algorithm, which results in the symbolic representations of motion targets via their outer rectangular bounds, is presented. Then according to the continuity constraint, motion targets are tracked through image sequence. Experiments show that this method is fast and feasible which can deal with the overlapping and timely missing problems of targets in tracking more properly comparing with other existing methods.