The training of Karhunen-Loève transform matrix and its application for H.264 intra coding

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review

2 Scopus Citations
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Author(s)

  • Yi Gao
  • Jiazhong Chen
  • Shengsheng Yu
  • Jingli Zhou
  • Lai-Man Po

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)111-123
Journal / PublicationMultimedia Tools and Applications
Volume41
Issue number1
Publication statusPublished - Jan 2009

Abstract

In H.264/AVC, 4 × 4 discrete cosine transform (DCT) is performed on the residual signals after intra prediction for decorrelation. Actually, residual blocks with different prediction modes exhibit different frequency characteristics. Therefore, the fixed transform matrix cannot match the energetic distribution of residual signals very well, which degrades the decorrelation performance. Fortunately, the energetic distributions of residual blocks with the same mode are relatively coincident, which makes it possible to train a universally good Karhunen-Loève transform (KLT) matrix for each mode. In this paper, an optimal frequency matching (OFM) algorithm is proposed to train KLT matrices for residual blocks and nine KLT matrices corresponding to nine prediction modes of 4 × 4 intra blocks are trained. Experimental results show that KLT with trained matrices yields a persistent gain over H.264 using 4 × 4 DCT with an average peak signal-to-noise ratio (PSNR) enhancement of 0.22dB and a maximum enhancement of 0.33dB. © 2008 Springer Science+Business Media, LLC.

Research Area(s)

  • Discrete cosine transform, H.264/AVC, Intra coding, Karhunen-Loève transform

Citation Format(s)

The training of Karhunen-Loève transform matrix and its application for H.264 intra coding. / Gao, Yi; Chen, Jiazhong; Yu, Shengsheng et al.

In: Multimedia Tools and Applications, Vol. 41, No. 1, 01.2009, p. 111-123.

Research output: Journal Publications and Reviews (RGC: 21, 22, 62)21_Publication in refereed journalpeer-review