Fast Bitrate Reduction Transcoding using Probability-Based Block Mode Determination in H.264

확률 기반의 블록 모드 결정 기법을 이용한 H.264에서의 고속 비트율 감축 트랜스코딩

  • Kim, Dae-Yeon (School of Computer Engineering, Dept. of Internet Engineering, DMS Lab., Sejong University) ;
  • Lee, Yung-Lyul (School of Computer Engineering, Dept. of Internet Engineering, DMS Lab., Sejong University)
  • 김대연 (세종대학교 컴퓨터공학부 인터넷공학과) ;
  • 이영렬 (세종대학교 컴퓨터공학부 인터넷공학과)
  • Published : 2005.09.01

Abstract

In this paper, we propose a fast bitrate reduction transcoding method to convert a bitstream coded by H.264 into a lower bitrate H.264 bitstream. Block mode informations and motion vectors generated by H.264 decoder are used for probability-based block mode determination in the proposed transcoding method. And the motion vector reuse and motion vector refinement process are applied in the proposed transcoding. In the experiment results, the proposed methods achieves approximately 40 times improvement in computation complexity compared with the cascaded pixel domain transcoding, while the PSNR(Peak Signal to Noise Ratio) is degraded with only $0.1\~0.3$ dB.

본 논문에서는 H.264로 부호화 된 비트스트림을 이전보다 낮은 비트율을 갖는 비트스트림으로 변환시키기 위한 고속 비트율 감축 트랜스코딩을 제안한다. 제안된 트랜스코딩 기법은, 복호기에서 나온 블록 모드 정보와 움직임 벡터를 이용하여, 확률 기반의 블록 모드 결정 기법과 움직임 벡터 재사용 및 정제 기법을 사용하였다. 그 결과, 직렬 화소 영역 트랜스코딩과 비교하였을 때 약 0.1$\∼$0.3 dB 정도의 화질 저하가 있지만, 부호화 시간을 비교하였을 때 약 40배 빠른 결과를 얻었다.

Keywords

References

  1. A. Vetro, C. Christopoulos, and H. Sun, 'Video Transcoding Architectures and Techniques: An Overview', IEEE Signal Processing Magazine, March 2003
  2. J. Xin, C. W. Lin, M. T. Sun 'Digital Video Transcoding', Proceedings of the IEEE, Vol.93 No.1,January 2005
  3. T. Wiegand, G. J. Sullivan, G. Bjontegaard, and A.Luthra, 'Overview of the H.264/AVC Video Coding Standard', IEEE Transactions on Circuits and Systems for Video Technology, Vol. 13, No. 7, July 2003
  4. Joint Video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG, Study of Final Comitee Draft of Joint Video Specication (ITU-T Rec. H.264; ISO/IEC 14496-10 AVC) (JVT F-100), ISO/IEC JTC1/SC29/WG11 and ITU-T SG16 Q.6, Dec. 2002
  5. Joint Video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG, Reference Software to Commitee Draft JVT-F100 JM82, ISO/IEC JTC1/SC29/WG11 and ITU-T SG16 Q.6
  6. Zhang, Jijun;Perkis, Andrew;Georganas, Nicolas .'H.264/AVC and Transcoding for Multimedia Adaptation', In Proceedings of the 6th COST 276 WORKSHOP, Thessaloniki, Greece, 6-7 May 2004
  7. G.J. Sullivan and T. Wiegand: Rate-Distortion Optimization for Video Compression IEEE Signal Processing Magazine, Vol. 15, November 1998, pp. 74-90 https://doi.org/10.1109/79.733497
  8. Z. Li, F. Pan, G. Feng, K. Lim, X. Lin, S. Rahardja, New Rate Control Algorithm, JVT-E069, 5th Meeting: Geneva, Oct. 2002
  9. Z. He, Y. K. Kim, Sanjit K. Mitra 'Low-Delay Rate Control for DCT Video Coding via -domain Source Modeling', IEEE Transactions on Circuits and Systems for Video Technology,Vol. 11, No. 8, pag. 928-940, Aug. 2001 https://doi.org/10.1109/76.937431
  10. K. D. Seo and J. K. Kim,'Motion vector refinement for video downsampling in the DCT domain,' IEEE Signal processing letters, vol.9, pp.356-359, November 2002 https://doi.org/10.1109/LSP.2002.804422