Journal of the Institute of Electronics Engineers of Korea CI (전자공학회논문지CI)

The Institute of Electronics and Information Engineers (대한전자공학회)
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Fast Transcoding from H.264 to MPEG-4

H.264에서 MPEG-4로 빠른 트랜스코딩

  • 권혁균 (세종대학교 인터넷공학과) ;
  • 이영렬 (세종대학교 인터넷공학과)
  • Published : 2004.11.01
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Abstract

This paper proposed two transcodiing methods, which maintain the same spatio-temporal resolution and reduce a spatial resolution, to convert a H.264 video bitstream into an MPEG-4 video bitstream. When the H.264 video bitstream is transformed into the MPEG-4 video bitstream, the conversions between H.264 block types and MPEG-4 block types are performed by minimizing distortion and the ${\times}4$ block-based motion vector mapping is performed. The proposed two transcoding methods run 4.14～5.1 times as fast as the cascaded transcoding methods in MPEG-4 encoder side, while the PSNR (peak-signal-to ratio) is slightly degrade with maximum 0.3dB.

본 논문은 H.264와 MPEG-4 간의 원활한 통신을 하기위한 두 가지 트랜스코딩 방법을 제안한다. 같은 공간적 시간적 해상도(spatio-temporal resolution)를 유지하는 트랜스코팅 방법과 공간적 해상도(temporal resolution)를 줄이는 트랜스코팅 방법을 제안한다. H.264 비트스트림(bitstream)이 MPEG-4 비트스트림으로 변환 시 H.264 블록형태를 MPEG-4에서 사용 할 수 있는 블록형태로 변환 시켜야 하며, 4×4 블록단위의 움직임 벡터도 8×8 블록단위의 움직임 벡터로 조정하여야 한다. 두 가지 제안된 트랜스코딩 방법은 직렬 화소영역 트랜스코팅 방법(cascade pixel-domain transcoding) 보다 MPEG-4 부호화기 측에서 4.1~5.1배 부호화 속도가 빠를 뿐만 아니라 영상의 화질 저하는 최고 0.3dB정도 밖에 떨어 지지 않는다.

Keywords

References

  1. J, Youn, M. T. Sun and C. W. Lin, 'Motion vector refinement for high performance transcoding,' IEEE Trans. Multimedia, vol. 1, pp, 30-40, Mar. 1999 https://doi.org/10.1109/6046.748169
  2. A. Vetro and C. Christopoulos and H. Sun, 'Video Transcoding Architectures and Techniques: An Overview,' IEEE signal Processing Magazine, ISSN: 1053-5888, Vol. 20, Issue 2, pp. 18-29, March 2003 https://doi.org/10.1109/MSP.2003.1184336
  3. P. Yin, M. Wu, and B. Lui and H. Sun, 'Drift compensation for reduced spatial resolution transcoding,' IEEE Trans. Circuits Syst. Video Technol., vol. 12, pp.1009-1020, Nov. 2002 https://doi.org/10.1109/TCSVT.2002.805509
  4. P. Yin, M. Wu, and B. Lui, 'Video transcoding by reducing spatial resolution,' in Proc. IEEE Int. Conf. Image Processing, Vancouver, BC, Canada, vol. 1, Oct. 2000, 972-975 https://doi.org/10.1109/ICIP.2000.901123
  5. P. Assuncao and M. Ghanbari, 'A frequency Domain video transcoder for dynamic bit-rate reduction of MPEG-2 bitstreams,' IEEE Trans. Circuits Syst. Video Technol. vol. 8, pp.953 - 967,Dec. 1998 https://doi.org/10.1109/76.736724
  6. C. W. Lin and Y. R. Lee, 'Fast algorithms for DCT-domain video transcoding,' in Proc. IEEE Int. Conf. Image Processing, Thessaloniki, Greece, vol. 1, Sept. 2001, pp.421-424 https://doi.org/10.1109/ICIP.2001.959043
  7. D. G. Morrison, M.E. Nilsson, and M. Ghanbari, 'Reduction of bit-rate of compressed video while in its coded form,' in Proc. 6th Int Workshop on Packet Video, Portland, OR, Sept. 1994, pp.392-406
  8. H.Sun, W. Kwok, and J, W. Zdepski, 'Architecture for MPEG compressed bitstream scaling,' IEEE Trans. Circuits Syst. Video Technol., vol. 6, pp, 191-199. Apr. 1996. J, Youn and M.T https://doi.org/10.1109/76.488826
  9. Tomas Wiegand, Joint Final Committee Draft (JFCD) of joint Vide specification(ITU-T Rec. H.264 ISO/ICE 1449-10 AVC), JVT-G050, March 2003
  10. Weiping Li, Jens-Rainer Ohm, Mihaela van der Schaar, Hong Jiang, Shipeng Li, 'MPEG-4 Video Verification version 17.0', ISO|IEC JTC1|SC29|WG11 N3515, July 2000
  11. http://bs.hhi.de/~suehring/tml/download/old_jm/jm73.zip
  12. MPEG ftp site