A New Rate Control algorithm for Transcoder Based-on Bit-rate Reduction Characteristics of Requantization

재양자화 특성을 이용한 비트율 변환기의 전송률 제어 기법

  • 서광덕 (한국과학기술원 전기 및 전자공학과) ;
  • 이상희 (한국과학기술원 전기 및 전자공학과) ;
  • 권순각 (한국과학기술원 전기 및 전자공학과) ;
  • 유국열 (한국과학기술원 전기 및 전자공학과) ;
  • 김재균 (한국과학기술원 전기 및 전자공학과)
  • Published : 1997.11.01

Abstract

Transcoding is the key technique to further reduce the bit-rate of a previously compressed video. The performance of the transcoding is evaluated by the two factors, the accuracy on the target bit-rate and the complexity of the implementation. In this paper, were propose a new rate control algorithm which has very accurate bit-rate control performance and much smaller computational complexity. For the accuracy problem, we empirically observe the relationship between the quantization step size and generated bits in requantization process and then find that the relationship can be characterized as the new piece-wise linear model. For the complexity problem, we reduce the role of feedback rate control. The simulation results show that the proposed method gives the better performance in the accuracy with the same picture quality than conventional rat control algorithm.

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