Fast block size prediction for MPEG-2 to H.264/AVC transcoding

TitleFast block size prediction for MPEG-2 to H.264/AVC transcoding
Publication TypeConference Paper
Year of Publication2008
AuthorsTang, Q., P. Nasiopoulos, and R. Ward
Conference NameAcoustics, Speech and Signal Processing, 2008. ICASSP 2008. IEEE International Conference on
Pagination1029 -1032
Date Publishedmar.
Keywordsblock size partitioning, block size prediction, computational complexity, data compression, discrete cosine transforms, H.264 compression ratio, H.264 motion vectors, H.264/AVC transcoding, image segmentation, motion estimation, motion re-estimation, MPEG-2 DCT coefficients, performance evaluations, rate-distortion performance, video coding, video transcoding scheme

One objective in MPEG-2 to H.264 transcoding is to improve the H.264 compression ratio by using more accurate H.264 motion vectors. Motion re-estimation is by far the most time consuming process in video transcoding, and improving the searching speed is a challenging problem. We introduce a new transcoding scheme that uses the MPEG-2 DCT coefficients to predict the block size partitioning for H.264. Performance evaluations have shown that, for the same rate-distortion performance, our proposed scheme achieves an impressive reduction in the computational complexity of more than 82% compared to the full range motion estimation used by H.264.


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