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This paper addresses the problem of transcoding compressed video bitstreams to reduced spatio-temporal resolutions. We propose a new technique to compensate drift error based on the principle of intra-block refresh. We also investigate other important issues related to the transcoding, such as the re-estimation of motion vectors and DCT coefficients. The rate control related to intra-refresh is also addressed. Our experimental results show that the intrarefresh method offers a good trade-off between quality and complexity in comparison to the reference method.
Circuits and Systems, 2002. ISCAS 2002. IEEE International Symposium on (Volume:4 )
Date of Conference: 2002