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Adaptive quantization by soft thresholding in HEVC
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Prangnell, Lee, Sanchez Silva, Victor and Vanam, Rahul (2015) Adaptive quantization by soft thresholding in HEVC. In: IEEE Picture Coding Symposium, Queensland, Australia, 31 May – 03 Jun 2015. Published in: IEEE Picture Coding Symposium (PCS) pp. 35-39. doi:10.1109/PCS.2015.7170042
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Official URL: http://dx.doi.org/10.1109/PCS.2015.7170042
Abstract
The High Efficiency Video Coding (HEVC) reference encoder includes a Uniform Reconstruction Quantization (URQ) method. This block level quantization technique does not take into account the importance of transform coefficients in terms of signal reconstruction. In this paper, we present a transform coefficient level quantization technique based on soft thresholding, in which the quantization parameter (QP) of a transform coefficient is altered according to its importance in the signal reconstruction process and according to the overall energy of the corresponding Transform Block (TB). The proposed method attains important coding efficiency performance gains as measured by the Bjøntegaard Delta Bitrate metric (BD-Rate). In comparison with reference encoder HM 16, our technique produces both luma and chroma BD-Rate improvements in all recommended JCT-VC test sequences, particularly for sequences in Class E using the Low Delay B and Low Delay P configurations, with BD-Rate reductions of up to 5.5% (Y), 13.2% (Cb) and 11.7% (Cr).
Item Type: | Conference Item (Paper) | ||||||
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Subjects: | Q Science > QA Mathematics > QA76 Electronic computers. Computer science. Computer software | ||||||
Divisions: | Faculty of Science, Engineering and Medicine > Science > Computer Science | ||||||
Library of Congress Subject Headings (LCSH): | Digital video -- Standards | ||||||
Journal or Publication Title: | IEEE Picture Coding Symposium (PCS) | ||||||
Publisher: | IEEE | ||||||
Official Date: | 2015 | ||||||
Dates: |
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Page Range: | pp. 35-39 | ||||||
DOI: | 10.1109/PCS.2015.7170042 | ||||||
Status: | Peer Reviewed | ||||||
Publication Status: | Published | ||||||
Access rights to Published version: | Restricted or Subscription Access | ||||||
Date of first compliant deposit: | 18 December 2015 | ||||||
Date of first compliant Open Access: | 18 December 2015 | ||||||
Funder: | Engineering and Physical Sciences Research Council (EPSRC) | ||||||
Grant number: | P83801G (EPSRC) | ||||||
Conference Paper Type: | Paper | ||||||
Title of Event: | IEEE Picture Coding Symposium | ||||||
Type of Event: | Conference | ||||||
Location of Event: | Queensland, Australia | ||||||
Date(s) of Event: | 31 May – 03 Jun 2015 | ||||||
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