Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding

Joo-Kyong LEE; Ki-Dong CHUNG

doi:10.1093/ietcom/e88-b.7.2856

Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding

Joo-Kyong LEE, Ki-Dong CHUNG

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The latest video coding standard, H.264/AVC, adopts 44 approximate transform instead of 88 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 88 DCT block into four newly quantized 44 transformed blocks. The experimental results show that the proposed scheme reduces computational complexity by 5-11% and improves video quality by 0.1-0.5 dB compared with the cascaded pixel-domain transcoding scheme that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).

Publication: IEICE TRANSACTIONS on Communications Vol.E88-B No.7 pp.2856-2863

Publication Date: 2005/07/01

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DOI: 10.1093/ietcom/e88-b.7.2856

Type of Manuscript: Special Section PAPER (Special Section on Mobile Multimedia Communications)

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Joo-Kyong LEE, Ki-Dong CHUNG, "Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding" in IEICE TRANSACTIONS on Communications, vol. E88-B, no. 7, pp. 2856-2863, July 2005, doi: 10.1093/ietcom/e88-b.7.2856.
Abstract: The latest video coding standard, H.264/AVC, adopts 44 approximate transform instead of 88 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 88 DCT block into four newly quantized 44 transformed blocks. The experimental results show that the proposed scheme reduces computational complexity by 5-11% and improves video quality by 0.1-0.5 dB compared with the cascaded pixel-domain transcoding scheme that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).
URL: https://global.ieice.org/en_transactions/communications/10.1093/ietcom/e88-b.7.2856/_p

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@ARTICLE{e88-b_7_2856,
author={Joo-Kyong LEE, Ki-Dong CHUNG, },
journal={IEICE TRANSACTIONS on Communications},
title={Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding},
year={2005},
volume={E88-B},
number={7},
pages={2856-2863},
abstract={The latest video coding standard, H.264/AVC, adopts 44 approximate transform instead of 88 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 88 DCT block into four newly quantized 44 transformed blocks. The experimental results show that the proposed scheme reduces computational complexity by 5-11% and improves video quality by 0.1-0.5 dB compared with the cascaded pixel-domain transcoding scheme that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).},
keywords={},
doi={10.1093/ietcom/e88-b.7.2856},
ISSN={},
month={July},}

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TY - JOUR
TI - Quantization/DCT Conversion Scheme for DCT-Domain MPEG-2 to H.264/AVC Transcoding
T2 - IEICE TRANSACTIONS on Communications
SP - 2856
EP - 2863
AU - Joo-Kyong LEE
AU - Ki-Dong CHUNG
PY - 2005
DO - 10.1093/ietcom/e88-b.7.2856
JO - IEICE TRANSACTIONS on Communications
SN -
VL - E88-B
IS - 7
JA - IEICE TRANSACTIONS on Communications
Y1 - July 2005
AB - The latest video coding standard, H.264/AVC, adopts 44 approximate transform instead of 88 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 88 DCT block into four newly quantized 44 transformed blocks. The experimental results show that the proposed scheme reduces computational complexity by 5-11% and improves video quality by 0.1-0.5 dB compared with the cascaded pixel-domain transcoding scheme that exploits inverse quantization (IQ), inverse DCT (IDCT), DCT, and re-quantization (re-Q).
ER -