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Proceedings Paper

Recent improvements to Thor with emphasis on perceptual coding tools
Author(s): Thomas Davies; Gisle Bjøntegaard; Arild Fuldseth; Steinar Midtskogen
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Paper Abstract

Thor supports a number of coding tools that have the potential to improve perceptual as well as objective quality. Synthetic reference frames may be used to support high frame rate applications in circumstances where encoders might typically transmit reduced frame rate content. Quantization matrices can be used to give improved visual quality by allocating bits more closely according to perceptual significance. Thor’s Constrained Low Pass Loop Filter provides significant subjective benefit in removing coding artefacts such as ringing. Improved colour fidelity can also be obtained by leveraging luma information. This paper discusses developments in these tools and their objective and subjective performance.

Paper Details

Date Published: 27 September 2016
PDF: 14 pages
Proc. SPIE 9971, Applications of Digital Image Processing XXXIX, 997118 (27 September 2016); doi: 10.1117/12.2238836
Show Author Affiliations
Thomas Davies, Cisco Systems, Inc. (United Kingdom)
Gisle Bjøntegaard, Philip Pedersens vei 1 (Norway)
Arild Fuldseth, Philip Pedersens vei 1 (Norway)
Steinar Midtskogen, Philip Pedersens vei 1 (Norway)

Published in SPIE Proceedings Vol. 9971:
Applications of Digital Image Processing XXXIX
Andrew G. Tescher, Editor(s)

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