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Fast Thumbnail Extraction Algorithm with Partial Decoding for HEVC

HEVC에서 부분복호화를 통한 썸네일 추출 알고리듬

  • Lee, Wonjin (Department of Electronic and Computer Engineering, Hanyang University) ;
  • Jeong, Jechang (Department of Electronic and Computer Engineering, Hanyang University)
  • 이원진 (한양대학교 전자컴퓨터통신공학과) ;
  • 정제창 (한양대학교 전자컴퓨터통신공학과)
  • Received : 2018.03.19
  • Accepted : 2018.04.23
  • Published : 2018.05.30

Abstract

In this paper, a simple but effective algorithm to reduce the computational complexity of thumbnail generation and to improve image quality without aliasing artifacts is proposed. For the high speed decoding, the proposed algorithm performs partial decoding per $4{\times}4$ boundary in TU(Transform Unit), and preforms TU boundary in PU(Prediction Unit). The proposed method defines the weights based on intra prediction directions and estimates the thumbnail pixel by using that weights. this method remains thumbnail extraction time and improves thumbnail image quality compared with conventional algorithms.

본 논문에서는 aliasing artifact 없이 영상 품질을 유지하고, 썸네일 생성에 필요한 계산 복잡도를 줄이는 알고리듬을 제안한다. 제안하는 알고리듬은 고속으로 복호화를 진행하기 위해서 TU(Transform Unit)에서는 $4{\times}4$크기마다 경계부분만을 부분 복호화를 수행하고, PU(Prediction Unit)에서는 TU경계부분만을 부분 복호화 한다. 그리고 화면내 예측 모드 방향에 따른 가중치 값을 구하고, 그 값을 이용해서 실제 썸네일 화소를 예측한다. 제안하는 방법은 기존 방법들과 썸네일 추출시간을 비슷하게 유지하면서 썸네일의 품질을 향상시킨다.

Keywords

References

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