ARLA/CLUSTER: Novos sistemas para compressão de video em testes

[João Costa > CT1FBF]

H.265/HEVC vs H.264/AVC: 50% bit rate savings verified

BBC Research & Development reports on the formal subjective
verification tests of the H.265/HEVC video compression standard

The BBC R&D video coding research team focused on evaluations of UHD
content and definition of analytics as part of standardisation
process.

The High Efficiency Video Coding (HEVC) standard has been developed
jointly by the two standardisation bodies ITU and ISO (as has been the
practice with all major video coding standards in the past 3 decades);
in this instance as the Joint Collaborative Team on Video Coding
(JCT-VC). The main goal of the process was to provide significantly
improved video compression compared with its predecessors; H.264/AVC
being the most recent. HEVC standard was ratified in 2013 as H.265 by
the ITU-T and as MPEG-H Part 2 by ISO/IEC.

The purpose of the subjective tests was to verify using human viewers
the compression gains of the new video coding standard that had
previously been estimated using objective metrics (e.g. Peak Signal to
Noise Ratio – PSNR). The PSNR based computations had shown up to about
50% bit rate savings in HEVC compared to the previous standard of
H.264/AVC, for similar video quality. The subjective tests used a
carefully selected set of coded video sequences at four different
picture sizes: UHD (3840x2160 and 4096x2048), 1080p (1920x1080), 720p
(1280x720) and 480p (832x480), at frame rates of 30Hz, 50Hz, or 60Hz.
The video content was chosen to represent diverse spatial and temporal
characteristics, and then coded using HEVC and AVC standards at a wide
span of bit rates producing a variety of quality levels.

Read the BBC story and download the paper from
http://www.bbc.co.uk/rd/blog/2016/01/h-dot-265-slash-hevc-vs-h-dot-264-slash-avc-50-percent-bit-rate-savings-verified

BBC Reasearch & Development
http://www.bbc.co.uk/rd
https://twitter.com/BBCRD