Abstract: This paper presents a new algorithm of moving object segmentation in video sequences, the algorithm integrates the data of moving object that are obtained from symmetrical differencing algorithm and background differencing algorithm, that is, the outline data of the middle frame movement object are obtained by symmetry differencing algorithm and the outline becomes the dividing line, while the exterior is dealt with dynamic background refresh method, and the interior is dealt with background differencing algorithm. The improvedalgorithm solves the hole and hollow when the moving object is short of sufficient surface texture by symmetrical differencing algorithm. The experimental result shows that the algorithm has the advantages of both the two algorithms. The algorithm has simple and accurate physical significance, fast calculation velocity,robust to noise, and can extract the moving body correctly.

Key words: video frequency, movement object, segmentation, symme trical difference, background subtraction