Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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Motion Estimation and Coding Technique using Adaptive Motion Vector Resolution in HEVC

HEVC에서의 적응적 움직임 벡터 해상도를 이용한 움직임 추정 및 부호화 기법

  • Lim, Sung-Won (Sejong University, Information and Telecommunication Research Institute, Dept. of Information and Communications Engineering) ;
  • Lee, Ju Ock (Sejong University, Information and Telecommunication Research Institute, Dept. of Information and Communications Engineering) ;
  • Moon, Joo-Hee (Sejong University, Information and Telecommunication Research Institute, Dept. of Information and Communications Engineering)
  • 임성원 (세종대학교 정보통신연구소 정보통신공학과) ;
  • 이주옥 (세종대학교 정보통신연구소 정보통신공학과) ;
  • 문주희 (세종대학교 정보통신연구소 정보통신공학과)
  • Received : 2012.07.20
  • Accepted : 2012.11.23
  • Published : 2012.11.30
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Abstract

In this papar, we propose a new motion estimation and coding technique using adaptive motion vector resolution. Currently, HEVC encodes a video using 1/4 motion vector resolution. If there are high texture regions in a picture, HEVC can't get a performance enough. So, we insert additional 1-bit flag meaning whether motion vector resolution is 1/4 or 1/8 in PU syntax. Therefore, decoder can recognize the transmitted motion vector resolution. Experimental results show that maximum coding efficiency gain of the proposed method is up to 5.3% in luminance and 7.9% in chrominance. Average computional time complexity is increased about 33% in encoder and up to 5% in decoder.

본 논문에서는, 인터 예측시 움직임 벡터의 해상도를 나타내는 1비트 플래그를 두어 적응적으로 1/4 해상도의 움직임 벡터와 1/8 해상도의 움직임 벡터를 선택하고 부호화하는 방법을 제안한다. 현재 HEVC에서는 1/4 해상도의 움직임 벡터만을 이용하여 부호화하는데, 영상 신호의 변화가 복잡한 영역에서 1/4 해상도의 움직임 벡터만으로는 충분한 효율을 얻어내지 못한다. 따라서 본 논문에서는 PU마다 해상도 플래그를 1비트 추가하여 적응적으로 움직임 벡터의 해상도를 결정할 수 있도록 한다. 제안한 방법의 실험 결과로서, 인코더의 복잡도는 30%~33% 증가하고 디코더의 복잡도는 1%~5% 증가하였지만, 휘도신호의 압축효율은 최대 5.3% 좋아졌으며, 색차신호의 압축효율은 최대 7.9% 좋아졌다.

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References

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