With higher resolution, wider colour gamut and extended dynamic range, the new Ultra High Definition TV (UHD) standards define a container which allows content creators to offer the consumer a much more immersive visual experience. However there are some artefacts noted within the container particularly around HDR material. Olie Bauman outlines why YCrCb are used and the human vision systems response to changes in chroma / luminance and the Correlation between R, G and B
As HDR and WCG expand the Colour Volumes he will show why thse increased from SD (601) to HD (709) to UHD (2020) and show the difference between PQ (Display Referred) and HLG (Scene Referred ) workflows
From this background he will show examples of artefacts due to Chroma down sampling and show the different characteristics – depending on work flow
He highlights that the problems will become greater as more content exploiting the full UHD container becomes available, requiring additional care and processing in content production and delivery
Although very little content exploiting the full range of the container is yet available some artefacts associated with the compression of high dynamic range (HDR) content have already been identified and reported in the literature. Specifically, the Chroma down-sampling process has been shown to cause disturbing artefacts for image regions of certain colour and luminance. The distortion and identified regions of the extended colour volume where artefacts ssociated with standard image processing techniques are more likely to occur will be discussed and means of minimising the visual effect mentioned. .
This is a revised presentation based on the paper presented and published at IBC 17
by Olie Baumann Alex Okell and Jacob Ström
Olie Baumann is Senior Technical Specialist, Video Processing, Media Solutions at Ericsson. In this role, Olie is responsible for leading research into video compression
and associated technologies. He has delivered several proof of concept demonstrations in high dynamic range and 360º (VR) video.
Olie joined Ericsson in 2013 and has held roles as Senior Algorithms Research Engineer and Principal Engineer. Prior to this, he spent five years working as a research fellow
in thefield of active vibration control and a further five years working in biomedical signal processing.
Olie received his Master of Engineering degree in 2000 and his Ph.D. in image processing in 2004,both from the University of Southampton, UK.
His work has been published in a number of journals by leading industry bodies including SMPTE and EBU, on topics such as the delivery of high dynamic range, ultra high definition television and HEVC.
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