A low complexity alf based on inter-channel correlation between chroma and luma in HEVC

Wei Jing Chen, Lei Sun, Lei Gu, Zhen Yu Liu, Takeshi Ikenaga

研究成果: Conference contribution

抄録

The adaptive loop filter (ALF) is a Wiener algorithm based technology which is applied to the reconstructed frame to improve the image quality in high-efficiency video coding (HEVC). In the conventional ALF algorithm, filter coefficients are re-designed for 16 times to obtain the best sets in one frame and also to increase the external memory access and computational cost significantly. This contribution proposes an inter-channel transformation scheme based on the correlation between chroma and luma to alleviate both computing time and memory bandwidth. First, the proposed algorithm generates the cross-correlation matrix and auto-correlation matrix in chroma samples which only spends one-quarter computational costs due to the resolution difference. Then, it applies the inter-channel transformation to derive the filter coefficients. The proposed methods not only eliminate a large number of multiplication operations, but also reduce the run-time by 58.70% averagely during whole ALF encoding process, while a negligible loss 0.074 BD-PSNR in the Y component.

本文言語English
ホスト出版物のタイトルProceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012
ページ175-180
ページ数6
DOI
出版ステータスPublished - 2012 12 1
イベント14th IASTED International Conference on Signal and Image Processing, SIP 2012 - Honolulu, HI, United States
継続期間: 2012 8 202012 8 22

出版物シリーズ

名前Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012

Conference

Conference14th IASTED International Conference on Signal and Image Processing, SIP 2012
国/地域United States
CityHonolulu, HI
Period12/8/2012/8/22

ASJC Scopus subject areas

  • コンピュータ ビジョンおよびパターン認識
  • 信号処理

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