There are several advantages to perform video object segmentation in a compressed domain.The primary benefit is with much high processing speed. Moreover

the video data already exiting in MPEG1 and 2 formats in many databases would have to be decompressed to employ the pixel domain techniques. In this paper

a moving objects segmentation algorithm based on gradient model in compressed domain is proposed. Firstly

DCT coefficients (AC［1］and AC［8］) are utilized to form the gradient image. Then we synthesize the edge motion message obtained from the accumulated motion vectors. Finally

desirable moving objects segmentation results are acquired.