Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Fast intra mode decision using DCT coefficient distribution in H.264/AVC

H.264/AVC에서 DCT계수 분포를 이용한 고속 인트라 모드 결정 방법

  • Hong, Sung-Wook (DMS Lab. Dept. of Computer Engineering, Sejong University) ;
  • Lee, Yung-Lyul (DMS Lab. Dept. of Computer Engineering, Sejong University)
  • 홍성욱 (세종대학교 컴퓨터공학과 DMS 연구실) ;
  • 이영렬 (세종대학교 컴퓨터공학과 DMS 연구실)
  • Received : 2010.05.17
  • Accepted : 2010.07.13
  • Published : 2010.07.30
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Abstract

he rate-distortion optimization (RDO) method in the H.264/AVC encoder is a technology that improves the coding efficiency, but increases the computational complexity. In this paper, a fast Intra mode decision algorithm using DCT (Discrete Cosine Transform) coefficients distribution is proposed to reduce the H.264 encoder complexity. The proposed method reduces the encoder complexity on average 68.40%, while the coding efficiency is slightly decreased compared with the H.264/AVC encoder.

H.264/AVC 부호기에서 각 모드 결정에 사용되는 방법인 율-왜곡 최적화(RDO(Rate-distortion optimization))는 부호기의 높은 성능 향상을 보이지만 많은 계산량을 요구하는 문제점을 가진다. 이러한 계산량을 줄이기 위해 원본 영상의 각 블록에 DCT(Discrete Cosine Transform) 계수 분포를 통해 각 블록의 방향성을 예측하여 부호기의 RDO 수행에 참여하는 후보 모드 수를 줄이는 방법을 제안한다. 제안하는 방법은 H.264/AVC에 부호화 방법에 비해 적은 PSNR 손실 및 비트의 증가에도 불구하고 평균 68.40%의 부호기 속도 향상을 가진다.

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References

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