Recent improvements to Thor with emphasis on perceptual coding tools

Thomas Davies; Gisle Bjøntegaard; Arild Fuldseth; Steinar Midtskogen

doi:10.1117/12.2238836

27 September 2016 Recent improvements to Thor with emphasis on perceptual coding tools

Thomas Davies, Gisle Bjøntegaard, Arild Fuldseth, Steinar Midtskogen

Proceedings Volume 9971, Applications of Digital Image Processing XXXIX; 997118 (2016) https://doi.org/10.1117/12.2238836
Event: SPIE Optical Engineering + Applications, 2016, San Diego, California, United States

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.

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Thomas Davies, Gisle Bjøntegaard, Arild Fuldseth, and Steinar Midtskogen "Recent improvements to Thor with emphasis on perceptual coding tools", Proc. SPIE 9971, Applications of Digital Image Processing XXXIX, 997118 (27 September 2016); https://doi.org/10.1117/12.2238836

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