Fast and efficient intra mode decision for HEVC, based on dual-tree complex wavelet

The new video coding standard, High Efficiency Video Coding (HEVC) uses up to 33 angular intra modes to achieve better coding efficiency in intra coding. While larger number of modes results in a significant increase in coding efficiency than its predecessor H.264/AVC, it leads to much more complexi...

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Vydáno v:Multimedia tools and applications Ročník 76; číslo 7; s. 9891 - 9906
Hlavní autoři: Pakdaman, Farhad, Hashemi, Mahmoud-Reza, Ghanbari, Mohammad
Médium: Journal Article
Jazyk:angličtina
Vydáno: New York Springer US 01.04.2017
Springer Nature B.V
Témata:
Analysis
Coding
Coding standards
Complexity
Computer Communication Networks
Computer engineering
Computer Science
Data Structures and Information Theory
Efficiency
Encoders
Image coding
Image processing systems
Multimedia
Multimedia Information Systems
Searching
Side effects
Special Purpose and Application-Based Systems
Studies
Video compression
Wavelet transforms
Complex wavelet
HEVC
Complexity reduction
Mode decision
Intra coding
ISSN:1380-7501, 1573-7721
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Shrnutí:The new video coding standard, High Efficiency Video Coding (HEVC) uses up to 33 angular intra modes to achieve better coding efficiency in intra coding. While larger number of modes results in a significant increase in coding efficiency than its predecessor H.264/AVC, it leads to much more complexity. To reduce this complexity, this paper proposes a novel method based on the dual-tree complex wavelet Transform (CWT). As CWT is effectively capable of representing edges in various directions, it is used to estimate the best intra angular mode in each coding block. The encoder then only analyzes a few modes around the best estimated mode. The experimental results show that searching only six modes around the estimated mode (estimated mode ± 3) plus DC and planar can predict the best mode in almost 80 % of the times. In fact the remaining unpredicted blocks have such unspecified behavior that even their random selections do not have any side effects. With all-intra configuration, searching with this method among the estimated mode ± 3 and DC and planar can improve the intra frame coding time by up to 4–10 times faster and can save the total encoding time over 32 %, while causing less than 0.4 % increase in bitrate and preserving the quality.
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ISSN:1380-7501
1573-7721
DOI:10.1007/s11042-016-3584-y