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Subjectif tests requirements for HDR

Subjectif tests requirements for HDR. Jean-Charles Gicquel, Jérôme Fournier, Orange Labs VQEG, July 2014. Introduction : Context. High sensitivity of CMOS sensors Up to 16 f-stops (Sony F65) More and more video cameras Availability of displays with high dynamic range of luminance

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Subjectif tests requirements for HDR

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  1. Subjectif tests requirements for HDR Jean-Charles Gicquel, Jérôme Fournier, Orange Labs VQEG, July 2014

  2. Introduction : Context • High sensitivity of CMOS sensors • Up to 16 f-stops (Sony F65) • More and more video cameras • Availability of displays with high dynamic range of luminance • Up to 5000 Cd/m2 • Just 2 references at the moment: Dolby and Sim2 • Several demonstrations of such technologies • Philips, Technicolor, BBC, Dolby,… • Workshop DVB-EBU in London 2013 and Munich 2014 Subjectif tests requirements for HDR

  3. Introduction : Context • HDR and EDR under consideration for upcoming video standards • UHD-phase2 • DVB, ITU, SMPTE • MPEG and EBU: need to have a common subjective method to evaluate fairly HDR technology Subjectif tests requirements for HDR

  4. Introduction : Orange position • Acquisition of a SIM2 display 2 months ago • Characterization a the display • Preparation of HDR, EDR contents and their SDR version in a format adapted to the HDR display • Visualization of these HDR and EDR contents and their SDR versions on it (viewing session with experts and non-experts) • First conclusions • Various opinions • Experts have mixed feelings regarding the type of contents: sceptical especially for movies contents • Globally non-experts appreciate the improvements Subjectif tests requirements for HDR

  5. Introduction : Orange position • To evaluate the added value of HDR technology in terms of QoE • To compare HDR and SDR references • New perceptual dimensions to be assessed? • realness, presence, visual discomfort/annoyance… • To have a fair comparison of existing and ongoing technologies • Impact on current end-to-end video architectures • HDR video formats • Components • Bandwidth and associated video interfaces • Transfer function and tone mapping issues • Compression schemes • SDR backward compatibility  Development of a new subjective test method required Subjectif tests requirements for HDR

  6. Introduction : HDR assessment main issues • Classification of test sources • Mean, peak and minimum luminance of test material • … • Test bed definition for subjective assessment of HDR contents • To display sources test material reducing potential degradations • Format conversion: bit depth, color components, EOTF, TMO • Video player • To propose a method to adjust HDR screen features • Specific to each HDR display? • Test charts dedicated to HDR rendering? • New subjective test method • Viewing conditions  use case relationship (cinema, TV, mobile) • Test protocol, subjective scales… Subjectif tests requirements for HDR

  7. Technical architecture new requirements • How to present HDR contents on HDR displays with different properties regarding the dynamic of luminance? • Exchange file format: OpenEXR? • Input file format (components, bit depth): display dependant? • Max and min luminance (contrast) • Psychophysical senstivity function in accordance with the use case (cinema, TV)? Weber, Barten, Moon & Spencer, …? • Transfer function (luminance and color quantization) • From 16 bits to 8, 10, 12 bits? • What is the position of VQEG considering these issues? • File format, conversion tools, selection of psychophysical function… Subjectif tests requirements for HDR

  8. Technical architecture new requirements • Additional keys issues • How to present SDR content on HDR displays? • SDR is the reference at the moment. It is needed to evaluate the added value of HDR compared to SDR • How to present REC. 709 contents on HDR display? • How to present HDR content on SDR displays? • Evaluation of backward compatibility • Tone Mapping Operator (Direct and inverse) for content generation Subjectif tests requirements for HDR

  9. Test method (1/3) Subjectif tests requirements for HDR

  10. Test method (2/3) Subjectif tests requirements for HDR

  11. Test method (3/3) Subjectif tests requirements for HDR

  12. Orange proposal • To design a subjective test method to answer the following question: What is the added value of HDR in comparison with SDR for TV services in terms of QoE? • Technical architecture based on a Sim2 display • Test method • Based on the Philips test method • Different room illuminations • EOTF adapted to HDR Contents • Preference scale • Tests material with various luminance levels (mean values?) • Additional tests using others perceptual scales • Questionnaires to understand viewers criteria to assess HDR contents • Realness, visual comfort/annoyance, perceived video quality… Subjectif tests requirements for HDR

  13. Thank you!

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