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- W1557804939 abstract "AbstractIn H.264/AVC [1], integer transforms are applied instead of the 8×8 discrete cosine transform (DCT) of previous standards to avoid inverse transform mismatch problems. However, these transforms make it difficult to transcode the precoded video contents with the earlier video coding standards into H.264/AVC in DCT-domain, thus causing cascaded re-encoding in the pixel-domain. There are strong requests for an efficient way to solve this problem. In this paper, we propose a new conversion scheme from an 8×8 DCT block into four 4×4 DCT blocks in H.264/AVC. Experimental results show that the proposed scheme improves PSNR up to 0.1dB and a little computational complexity compared with the cascaded pixel-domain IDCT/DCT. Moreover, other DCT-domain transcoding methods are applicable based on our scheme.KeywordsDiscrete Cosine TransformInverse Discrete Cosine TransformAdvance Video CodeDiscrete Cosine Transform BlockQuantization Step SizeThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves." @default.
- W1557804939 created "2016-06-24" @default.
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- W1557804939 date "2005-01-01" @default.
- W1557804939 modified "2023-09-26" @default.
- W1557804939 title "DCT Block Conversion for H.264/AVC Video Transcoding" @default.
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- W1557804939 doi "https://doi.org/10.1007/11549468_100" @default.
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