Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Improved CABAC for Lossless Video Compression

무손실 동영상 압축을 위한 향상된 CABAC

  • Kim, Dae-Yeon (DMS Lab., Dept. of Computer Engineering, Sejong University) ;
  • Choi, Jin-Soo (Radio & Broadcasting Research Division, ETRI) ;
  • Lee, Yung-Lyul (DMS Lab., Dept. of Computer Engineering, Sejong University)
  • 김대연 (세종대학교 컴퓨터공학과 DMS 연구실) ;
  • 최진수 (한국전자통신연구원 전파방송연구단) ;
  • 이영렬 (세종대학교 컴퓨터공학과 DMS 연구실)
  • Published : 2007.07.29
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Abstract

In this paper, an improved CABAC is proposed for the lossless compression in H.264/AVC. CABAC in the lossless coding is not as efficient as that in the lossy compression since it was developed for lossy coding. CABAC for the lossless coding in H.26과/AVC Advanced 4:4:4 Profile is applied without the change of the conventional binarization method. Thus, a binarization method considering the statistical characteristic of residual signals is proposed for the lossless coding in 0.264/AVC Advanced 4:4:4 Profile. The experimental results show that the proposed method obtains approximately 3.4% bitrate reduction in comparison to that of the conventional lossless coding.

본 논문에서는 H.264/AVC에서 무손실 압축을 위하여 향상된 CABAC 엔트로피 부호화 방법을 제안한다. 0.264/AVC의 CABAC은 손실 압축을 지원하기 위해 개발되었기 때문에 무손실 압축에서 사용할 경우 압축 성능이 좋지 않다. 실제로 0.264/AVC Advanced 4:4:4 프로파일의 무손실 압축을 위한 엔트로피 부호화에도 기존의 방법을 수정 없이 그대로 사용하고 있기 때문에 엔트로피 측면에서 비효율성을 노출하고 있다. 따라서 0.264/AVC Advanced 4:4:4의 무손실 압축을 위해 잔여 신호의 통계적 특성을 고려한 이진화 방법을 제안하였다. 실험 결과, 제안된 방법은 기존의 무손실 부호화와 비교하여 약 3.4%의 비트율을 절약할 수 있었다.

Keywords

References

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