Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding(<Special Section>Mobile Multimedia Communications)
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概要
- 論文の詳細を見る
The latest video coding standard, H.264/AVC [1], adopts 4×4 approximate transform instead of 8×8 discrete cosine transform (DCT) to avoid the inverse transform mismatch problem. However, that is only one of the factors that make it difficult to transcode pre-coded video contents with the previous standards to H.264/AVC in the common domain without causing cascaded pixel-domain transcoding. In this paper, to support the existent DCT-domain transcoding schemes and to reduce computational complexity, we propose an efficient algorithm that converts the quantized 8×8 DCT block into four newly quantized 4×4 transformed blocks. The experimental results show that the proposed scheme reduces computational complexity by 5-11% and improves video quality by 0.1-0.5dB compared with the cascaded pixel-domain transcoding scheme that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).
- 社団法人電子情報通信学会の論文
- 2005-07-01
著者
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LEE Joo
Departments of Surgery, Seoul National University College of Medicine
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Chung Ki
Department Of Computer Engneering Pusan National University
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Lee Joo
Department Of Biology Yonsei University
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Lee Joo
Department Of Computer Engneering Pusan National University
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Chung Ki
Department Of Animal Resources Technology Jinju National University
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