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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

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.

Original languageEnglish
Title of host publicationProceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012
Pages175-180
Number of pages6
DOIs
Publication statusPublished - 2012
Event14th IASTED International Conference on Signal and Image Processing, SIP 2012 - Honolulu, HI
Duration: 2012 Aug 202012 Aug 22

Other

Other14th IASTED International Conference on Signal and Image Processing, SIP 2012
CityHonolulu, HI
Period12/8/2012/8/22

Fingerprint

Image coding
Data storage equipment
Autocorrelation
Image quality
Costs
Bandwidth

Keywords

  • ALF
  • Hevç
  • Inter-Channel Correlation

ASJC Scopus subject areas

  • Computer Vision and Pattern Recognition
  • Signal Processing

Cite this

Chen, W. J., Sun, L., Gu, L., Liu, Z. Y., & Ikenaga, T. (2012). A low complexity alf based on inter-channel correlation between chroma and luma in HEVC. In Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012 (pp. 175-180) https://doi.org/10.2316/P.2012.786-069

A low complexity alf based on inter-channel correlation between chroma and luma in HEVC. / Chen, Wei Jing; Sun, Lei; Gu, Lei; Liu, Zhen Yu; Ikenaga, Takeshi.

Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012. 2012. p. 175-180.

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Chen, WJ, Sun, L, Gu, L, Liu, ZY & Ikenaga, T 2012, A low complexity alf based on inter-channel correlation between chroma and luma in HEVC. in Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012. pp. 175-180, 14th IASTED International Conference on Signal and Image Processing, SIP 2012, Honolulu, HI, 12/8/20. https://doi.org/10.2316/P.2012.786-069
Chen WJ, Sun L, Gu L, Liu ZY, Ikenaga T. A low complexity alf based on inter-channel correlation between chroma and luma in HEVC. In Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012. 2012. p. 175-180 https://doi.org/10.2316/P.2012.786-069
Chen, Wei Jing ; Sun, Lei ; Gu, Lei ; Liu, Zhen Yu ; Ikenaga, Takeshi. / A low complexity alf based on inter-channel correlation between chroma and luma in HEVC. Proceedings of the IASTED International Conference on Signal and Image Processing, SIP 2012. 2012. pp. 175-180
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