Video transcoding for universal multimedia access

ABSTRACT

This paper discusses the issue of adapting video streams to different type of terminals with different terminal capabilities such as screen size, amount of available memory, processing power and type of network access. This functionality will be very useful for the Universal Multimedia Access application related to MPEG-7 standardization activities. Two different models for transcoding are examined, rate reduction and resolution reduction. Results will show that the computational complexity of the basic transcoding model can be reduced for each model by, on average, 39% and 23% without significant loss in quality. Comparisons with the scaleable coding model are also shown.

REFERENCES

• 1: P. A. A. Assuncao and Mohammed Ghanbari, Postprocessing of MPEG2 Coded Video for Transmission at lower bit rates, Proc. IEEE ICASSP '96, vol. 4, pp. 1998-2001, May 1996.
• 2: Vasudev Bhaskaran , Konstantinos Konstantinides, Image and Video Compression Standards: Algorithms and Architectures, Kluwer Academic Publishers, Norwell, MA, 1997
• 3: Bj6rk N. and Christopoulos C., "Transcoder Architectures for video coding", IEEE Transactions on Consumer Electronics, Vol. 44, No. 1, pp. 88-98, February 1998.
• 4: S.F. Chang and D. Messerschmitt, "Manipulation and composition of MC-DCT compressed video", IEEE JSAC Vol. 13, No. 1, January 1995, pp. 1-11.
• 5: ITU-T Recommendation H.263, "Video coding for low bitrate communication", 11/95.
• 6: ITU - T, Study Group 16, Draft Text of recommendation H.263 version 2 (H.263+), September 1997.
• 7: G. Keesman, R. Hellinghuizen, Fokke Hoeksema and Geert Heideman, Transeoding of MPEG bitstreams, Signal Processing: Image Communication, vol. 8, pp. 481-500, September 1996.
• 8: L.-K. Liu, and E. Feig, "A block-based gradient descent search algorithm for block motion estimation in video coding", IEEE Trans. CAS, Vol. 6, No. 4, pp. 419-422, August 1996.
• 9: B. K. Natarajan , B. Vasudev, A fast approximate algorithm for scaling down digital images in the DCT domain, Proceedings of the 1995 International Conference on Image Processing (Vol.2)-Volume 2, p.2241, October 23-26, 1995
• 10: H. Sun, W. Kwok and J. W. Zdepski, Architectures for MPEG compressed bitstream scaling, IEEE Trans. on Circuits and Systems for Video Technology, vol. 6, No. 2, pp. 191-199, April 1996.
• 11: "MPEG-7 Applications document v.8.1", ISO/IEC JTCI/SC29/WG 11/M4839, July 1999, Vancouver, Canada.
• 12: "MPEG-7 Multimedia Description schemes XM (version 3.0), ISO/IEC JTCl/SC 29/Wg 11/N3410, May 2000, Geneva.

INDEX TERMS

Primary Classification:
  C. Computer Systems Organization
  C.2 COMPUTER-COMMUNICATION NETWORKS

Additional Classification:
  H. Information Systems
  H.5 INFORMATION INTERFACES AND PRESENTATION (I.7)

  K. Computing Milieux
  K.1 THE COMPUTER INDUSTRY
      Subjects: Standards

General Terms:
Design, Management, Measurement, Performance, Standardization, Theory