Hardware oriented enhanced category determination based on CTU boundary deblocking strength prediction for SAO in HEVC encoder

Gaoxing Chen, Zhenyu Pei, Zhenyu Liu, Takeshi Ikenaga

Research output: Contribution to journalArticle

Abstract

High efficiency video coding (HEVC) is a video compression standard that outperforms the predecessor H.264/AVC by doubling the compression efficiency. To enhance the coding accuracy, HEVC adopts sample adaptive offset (SAO), which reduces the distortion of reconstructed pixels using classification based non-linear filtering. In the traditional coding tree unit (CTU) grain based VLSI encoder implementation, during the pixel classification stage, SAO cannot use the raw samples in the boundary of the current CTU because these pixels have not been processed by deblocking filter (DF). This paper proposes a hardware-oriented category determination algorithm based on estimating the deblocking strengths on CTU boundaries and selectively adopting the promising samples in these areas during SAO classification. Compared with HEVC test mode (HM11.0), experimental results indicate that the proposed method achieves an average 0.13%, 0.14%, and 0.12% BD-bitrate reduction (equivalent to 0.0055 dB, 0.0058 dB, and 0.0097 dB increases in PSNR) in CTU sizes of 64 × 64, 32 × 32, and 16 × 16, respectively.

Original languageEnglish
Pages (from-to)788-797
Number of pages10
JournalIEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
VolumeE99A
Issue number4
DOIs
Publication statusPublished - 2016 Apr 1

Fingerprint

Video Coding
Encoder
Image coding
High Efficiency
Coding
Hardware
Unit
Prediction
Pixels
Pixel
Nonlinear filtering
Image compression
Video Compression
Nonlinear Filtering
Doubling
Compression
Filter
Experimental Results

Keywords

  • Category determination
  • Hardware oriented
  • HEVC
  • Sample adaptive offset

ASJC Scopus subject areas

  • Electrical and Electronic Engineering
  • Computer Graphics and Computer-Aided Design
  • Applied Mathematics
  • Signal Processing

Cite this

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abstract = "High efficiency video coding (HEVC) is a video compression standard that outperforms the predecessor H.264/AVC by doubling the compression efficiency. To enhance the coding accuracy, HEVC adopts sample adaptive offset (SAO), which reduces the distortion of reconstructed pixels using classification based non-linear filtering. In the traditional coding tree unit (CTU) grain based VLSI encoder implementation, during the pixel classification stage, SAO cannot use the raw samples in the boundary of the current CTU because these pixels have not been processed by deblocking filter (DF). This paper proposes a hardware-oriented category determination algorithm based on estimating the deblocking strengths on CTU boundaries and selectively adopting the promising samples in these areas during SAO classification. Compared with HEVC test mode (HM11.0), experimental results indicate that the proposed method achieves an average 0.13{\%}, 0.14{\%}, and 0.12{\%} BD-bitrate reduction (equivalent to 0.0055 dB, 0.0058 dB, and 0.0097 dB increases in PSNR) in CTU sizes of 64 × 64, 32 × 32, and 16 × 16, respectively.",
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