Early detection of all-zero 4 × 4 blocks in High Efficiency Video Coding

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

18 Scopus Citations
View graph of relations

Author(s)

  • Hanli Wang
  • Han Du
  • Weiyao Lin
  • Oscar C. Au
  • Jun Wu
  • Zhihua Wei

Related Research Unit(s)

Detail(s)

Original languageEnglish
Pages (from-to)1784-1790
Journal / PublicationJournal of Visual Communication and Image Representation
Volume25
Issue number7
Online published3 Sep 2014
Publication statusPublished - Oct 2014

Abstract

Similar to previous video coding standards, transform and quantization are employed in the most recent video coding standard High Efficiency Video Coding (HEVC), and there exist a large number of transform coefficients being quantized to zeros. In order to reduce the computations in transform and quantization, a novel prediction algorithm is designed to early detect all-zero 4×4 blocks prior to transform and quantization. A theoretical analysis is performed on the 4×4 Discrete Cosine Transform (DCT) and the related quantization functions in HEVC; consequently, two sufficient conditions to early detect all-zero 4×4 blocks are derived and the proposed prediction algorithm is developed while balancing the detection efficiency and computational overheads. Experimental results demonstrate that the proposed algorithm is able to efficiently predict all-zero 4×4 blocks and reduce redundant DCT and quantization computations while maintaining the same coding performance in terms of video quality and bit rates.

Research Area(s)

  • Compression efficiency, DCT, Early detection, Fast encoding, HEVC, Quantization, Video quality, Zero coefficients

Citation Format(s)

Early detection of all-zero 4 × 4 blocks in High Efficiency Video Coding. / Wang, Hanli; Du, Han; Lin, Weiyao; Kwong, Sam; Au, Oscar C.; Wu, Jun; Wei, Zhihua.

In: Journal of Visual Communication and Image Representation, Vol. 25, No. 7, 10.2014, p. 1784-1790.

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