Predictive motion estimation for reduced-resolution video from high-resolution compressed video
J.W.C. Wong, O.C. Au, Peter H. W. Wong, Alexis Michael Tourapis · 2002
To convert a compressed video sequence to a lower-resolution 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. 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 with low additional complexity.