METHOD AND CLOSED-LOOP TRANSCODER FOR REDUCED SPATIAL RESOLUTION TRANSCODING OF COMPRESSED BITSTREAM OF SEQUENCE OF FRAMES OF VIDEO SIGNAL

摘要

PROBLEM TO BE SOLVED: To provide a method and closed-loop transcoder for reducing the spatial resolution of a compressed bitstream of a sequence of frames of a video signal by first decoding the frames and storing the decoded frames in a first frame buffer.;SOLUTION: While performing decoding, motion compensating is performed with full resolution motion vectors of the stored decoded frames. The decoded frames are then down-sampled to reduced resolution, and stored in a second frame buffer. The reduced resolution frames are partially encoded to produce a reduced resolution compressed bitstream of the video. While performing the partial encoding, motion compensation is performed with reduced resolution motion vectors of the stored reduced resolution frames.;COPYRIGHT: (C)2003,JPO