Browse > Article

Bit-rate control of transcoder considering the activity and direction of motion vector  

구성조 (경북대학교 전자공학과 데이터 통신 시스템 연구실)
장해원 (경북대학교 전자공학과 데이터 통신 시스템 연구실)
황찬식 (경북대학교 전자공학과 데이터 통신 시스템 연구실)
Publication Information
The Journal of Korean Institute of Communications and Information Sciences / v.28, no.12C, 2003 , pp. 1209-1216 More about this Journal
Abstract
The transcoding is needed to modify the bit rate of the video bitstream in accordance with the bandwidth of a variety of channels in order to provide users with a realtime multimedia service and more stable and credible VOD(Video On Demand) service on various wire/wireless network. This paper suggests how to guarantee the video quality in the transcoding process, taking the activity and direction of the macroblock into consideration, thereby reducing the calculation. The threshold of the macroblock's activity and direction is applicable to the different videos, with the DCT coefficients from the intermediate data in the decoding process. Moreover, the suggested video transcoding algorism enables us to maintain the proper video quality and reduce the calculation through the video bit rate change experiment in H.263 environment.
Keywords
transcoding; bit rate; activity; direction; motion vector;
Citations & Related Records
연도 인용수 순위
  • Reference
1 M. Ghabari, 'Two-layer coding of video signals for VBR networks', IEEE Journal on Selected Areas in Communications, vol. 7, PP. 771-781, June 1989   DOI   ScienceOn
2 Jeongnam Youn, Ming-ting Sun, Chia-Wen Lin, 'Motion Vector Refinement for High Performance Transcoding', IEEE Trans. on Multimedia, Vol. 1, No. 1, pp. 30-40, Mar 1999   DOI   ScienceOn
3 Kai-Tat Fung, Yui-Lam Chan, and Wan-Chi Siu, 'New architecture for dynamic frame-skipping transcoder', IEEE Trans. on Image Processing, Vol. 11, No. 8, pp. 886-900, Aug. 2002   DOI   ScienceOn
4 N. Bjork and C. Christopoulos, 'Transcoder Architecture for Video Coding', IEEE Trans. Consumer Electron, Vol. 44, pp. 88-98, Feb. 1998   DOI   ScienceOn
5 G. Keesman, R. Hellinghuizen, F. Hoeksema, G. Heidema, 'Transcoding of MPEG bitstreams', Signal Processing : Image Communication 8, pp. 481-500, 1996
6 Tamer Shanableh, M. Ghabari, 'Heterogeneous video transcoding to lower spatio-temporal resolutions and different encoding fromats', IEEE Trans. on Multimedia, Vol. 2, No. 2, pp. 101-110, June 2000   DOI   ScienceOn
7 Bo Shen, Ishwar K. Sethi, Bhaskaram Vasudev 'Adaptive Motion-Vector Resampling for Compressed Video Downscaling', IEEE Trans. on Circuits and Systems for Video Technology, VoI. 9, No. 6, pp. 929-936, Sept. 1999   DOI   ScienceOn
8 P. A. A. Assuncao, M. Ghanbari, 'Optimal transcoding of compressed video', IEEE Int. Conf. on Image Processing 1997, Vol. 1, pp. 739-742, Oct. 1997
9 Kai-Tat Fung, Wan-Chi Siu, 'DCT-based video frame-skipping transcoder', Proc. Int. Symposium on Circuits and Systems 2003, Vol. 2, pp. 656-659, May 2003
10 Mei-Juan Chen, Ming-Chung Chu, and Chih-Wei Pan, 'Efficient Motion-Estimation Algorithm for Reduced Frame-Rate Video Transcoder', IEEE Trans. on Circuits and Systems for Video Technology, Vol.4, pp. 269-275, April 2002