Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Secondary Residual Transform for Lossless Intra Coding in HEVC

제 2차 잔차 변환을 이용한 HEVC 무손실 인트라 코딩

  • Kwak, Jae-Hee (DMS Lab. Dept. of Computer Engineering, Sejong University) ;
  • Lee, Yung-Lyul (DMS Lab. Dept. of Computer Engineering, Sejong University)
  • 곽재희 (세종대학교 컴퓨터공학과 DMS 연구실) ;
  • 이영렬 (세종대학교 컴퓨터공학과 DMS 연구실)
  • Received : 2012.07.16
  • Accepted : 2012.09.05
  • Published : 2012.09.30
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Abstract

A new lossless intra coding method based on residual transform is applied to the next generation video coding standard HEVC (High Efficiency Video Coding). HEVC includes a multi-directional spatial prediction method to reduce spatial redundancy by using neighboring samples as a prediction for the samples in a block of data to be encoded. In the new lossless intra coding method, the spatial prediction is performed as samplewise DPCM (Difference Pulse Code Modulation) but is implemented as block-based manner by using residual transform and secondary residual transform on the HEVC standard. Experimental results show that the new lossless intra coding method reduces the bit rate by approximately 6.45% in comparison with the lossless intra coding method previously included in the HEVC standard.

차세대 영상압축 표준인 HEVC (High Efficiency Video Coding)에 적용되는 새로운 인트라 코딩 기법은 잔차 변환을 기반으로 하고 있다. HEVC는 공간상의 중복성을 줄이기 위해 다양한 방향의 공간 예측 방식을 하도록 만들어졌으며, 이를 위해 부호화 하려는 블록의 주변 화소들을 활용하고 있다. 본 논문에서 제안하는 HEVC 표준에서의 새로운 무손실 인트라 코딩 방식은, 공간적 예측을 위해 화소 단위 DPCM (Difference Pulse Code Modulation)을 수행하면서도 잔차 변환과, 잔차 변환의 결과로 얻어지는 잔차 신호에 대해 잔차 변환을 재차 시행하는 제 2차 잔차 변환을 사용하여 블록 단위 처리 구조를 유지하고 있다. 결과에서 보여지는 대로, 새로운 무손실 인트라 코딩 방식은 기존의 HEVC 표준과 비교하였을때 비트레이트를 평균 약 6.45%정도 감소시킨다.

Keywords

References

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