KEYWORDS: High dynamic range imaging, Televisions, Video, Standards development, Image processing, Video processing, Molybdenum, Computer programming, Signal processing, Image resolution
This paper describes of a set of subjective tests that the authors have carried out to assess the end user perception of
video encoded with High Dynamic Range technology when viewed in a typical home environment.
Viewers scored individual single clips of content, presented in High Definition (HD) and Ultra High Definition (UHD),
in Standard Dynamic Range (SDR), and in High Dynamic Range (HDR) using both the Perceptual Quantizer (PQ) and
Hybrid Log Gamma (HLG) transfer characteristics, and presented in SDR as the backwards compatible rendering of the
HLG representation.
The quality of SDR HD was improved by approximately equal amounts by either increasing the dynamic range or
increasing the resolution to UHD. A further smaller increase in quality was observed in the Mean Opinion Scores of the
viewers by increasing both the dynamic range and the resolution, but this was not quite statistically significant.
KEYWORDS: Video, Video compression, Digital video discs, Wavelets, Correlation function, Quantization, Video coding, Video processing, Fourier transforms, Statistical analysis
This paper presents the results of measuring the Hurst parameter for a wide selection of video sequences encoded with H.264 compression with constant quantization index. Six techniques for measuring the Hurst parameter are compared and used on the source data. The Hurst parameter was found to have an average value of 0.9, with a minimum of about 0.8, over the whole set of sequences, indicating the presence of a significant degree of long range dependence in the statistics of the coded data. It is known that traffic with long range dependence causes increased queue length and more packet loss than traffic with only short range dependence. We conclude that if video is to be transmitted at near constant quality, the fact that the resulting data has a significant degree of long range dependence must be taken into account when provisioning the traffic in a network in order to meet quality of service guarantees.
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