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To convert a compressed video sequence to a lowerresolution compressed video, one typically needs to decompress the original sequence, down-sample each frame, and recompress it. It involves motion estimation in the reduced sequence which is computational intensive. In this paper, we propose a novel fast algorithm to predict the motion vector of the reduced video by using the original motion information in the compressed bitstream. We achieve a much higher quality than existing algorithms withdoi:10.1109/icip.1998.723424 dblp:conf/icip/WongAWT98 fatcat:7lzi4nqe3rgnrehnc3jpdriga4