한국통신학회논문지 (The Journal of Korean Institute of Communications and Information Sciences)

한국통신학회 (The Korean Institute of Commucations and Information Sciences)
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분산 동영상 부호화 시스템을 위한 전송률 및 왜곡 제어 방법

Rate-Distortion Control Method for Distributed Video Coding System

  • 문학수 (가톨릭대학교 정보통신전자공학과) ;
  • 이창우 (가톨릭대학교 정보통신전자공학과)
  • 투고 : 2012.08.02
  • 심사 : 2012.10.22
  • 발행 : 2012.11.30
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초록

간단한 부호기를 사용하는 분산 동영상 부호화 시스템은 복호기에서 생성한 부가정보와 원 Wyner-Ziv (WZ) 프레임간의 차이를 채널부호를 이용해 정정하게 되는데 오류정정이 제대로 이루어지지 않으면 복호기에서 피드백 채널을 통해 추가 패리티 비트를 요청하게 된다. 특히 이동통신 등과 같이 제한된 환경에서 분산 동영상 부호화 시스템을 사용하기 위해서는 전송률 및 부호화 왜곡을 효율적으로 제어할 수 있어야 한다. 본 논문에서는 부호기에서 비트 전송률을 제한함으로써 통신환경에 맞도록 비트 전송률을 일정하게 제어하는 방법을 제안한다. 제안하는 방법은 전송률을 적절히 제어할 뿐 만 아니라 부호화 성능도 일정하게 유지하는 장점이 있다.

In the distributed video coding (DVC) system, the difference between the side information and the original Wyner-Ziv frame is corrected using channel codes and the additional parity bits are requested through feedback channel if the error is not corrected. The efficient bit rate control is important to use the DVC system in the band-limited channel, such as mobile communication environments. In this paper, the constant bit rate control method in the encoder of the DVC system is proposed. The coding performance as well as the bit rate is efficiently controlled by the proposed method.

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참고문헌

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