IP, 4K/UHD & HDR test & measurement challenges explained - - PowerPoint PPT Presentation

IP, 4K/UHD & HDR

test & measurement challenges explained

Phillip Adams, Managing Director

Challenges of SDR → HDR transition

What’s to be covered

• HDR – a quick overview
• Compliance & monitoring challenges
• Tools for test & measurement

HDR overview – more compelling, more realistic pictures

BRIGHTER IMAGES Outdoor scenes can be noticeably brighter than indoor scenes STRONGER HIGHLIGHTS Highlights, specular reflections can be increased x100 – increases realism GREATER CONTRAST Increased contrast Detail maintained in deep blacks WIDE COLOUR GAMUT Significantly increased colour volume (chromaticity) Saturated colours can be brighter

Evolving HDR/WCG Standards

HDR ARIB STD-B67 (HLG) Hybrid Log-Gamma (Origin BBC/NHK) ST2084:2014 (PQ) High Dynamic Range Electro-Optical Transfer Function of Mastering Reference Displays (origin: Dolby) Colour Gamut ITU-R BT.709 (Parameter values for HDTV systems) ITU-R BT.2020 (Parameter values for UHDTV systems) ITU-R BT. 2100 (07/2016) Image parameter values for high dynamic range television for use in production and international programme exchange Sony Formats S-Log3, S-Gamut3 S-Log3-live, BT.2020

NAB 2017 - Growing interest in HDR/WCG for HD applications

HDR scales comparison

Image credit: TV Technology

Colour gamuts are abstracted into mathematical colour models & defined for use as colour spaces with finite chromaticity values The CIE 1931 colour space compares physical pure colours (i.e. wavelengths) in the electromagnetic visible spectrum and physiological perceived colours in human colour vision In ‘full HD’ television systems, BT.709 defines the colour gamut WCG refers to the colour gamut defined in BT.2020

Wide Colour Gamut (WCG) overview

Image credit: CEPro

Contrasting SDR/709 & HDR/2020

Image credit: Dolby

HDR/WCG overview

Superior luminosity (Y-Axis) of HDR (PQ) in BT.2020, compared to SDR in BT.709

Image credit: Sony

A whole new set of test & measurement tools is needed to manage the wider range

• f brightness & broader colour space
• ffered by HDR and WCG

“ ”

Compliance & monitoring challenges

• Managing simultaneous SDR/HDR

production

• Ensuring HDR levels are right for key

skin & grass areas

• Monitoring signal colour space after

mapping to another colour space

• Evolving products & standards –

ensuring consistent settings across equipment

• Conversion between standards is

technically complex & not an exact science!

HDR / WCG

New test & measurement tools for High Dynamic Range / Wide Colour Gamut

HDR test pattern generation

• BT.709, BT.2020 colour space
• SDR, PQ, HLG* and S-log3*
• HDR patterns
• SDR patterns in HDR containers
• Pathological overlay
• Full range of HD to UHD

standards HDR enabled test pattern generator

* Feature in development

HDR Heat-map tool measures luminance

Programmable HDR Heat-map to highlight luminance zones

Ideal for adjusting brightness of picture

• 7 simultaneous and

programmable colour overlay bands

• Individual upper & lower
• verlay threshold controls
• User presets for SDR & HDR

modes

• Selectable background grey /

colour

• Identify shadows, mid-tones or

specular highlights

HDR Heat-map tool measures luminance

WCG: monitoring chromaticity with CIE chart

BT.2020 (WCG) BT.709 (HD)

• BT.709, BT.2020, DCI-P3 colour

gamut overlays

• x, y labelled axis*
• Tooltip co-ordinate display
• Picture linked cursor*
• Supports SDR, PQ, HLG* and S-

log3* CIE 1931 X Y chart

* Feature in development

Waveform with HDR / WCG support

• Graticules for SDR & HDR
• YCbCr/YRGB & single trace

modes

• Tooltip co-ordinate display
• 12-bit resolution
• Horizontal / vertical pan and

zoom

• Picture linked cursor*
• SDR, PQ, HLG* and S-log3*

Waveform Display

* Feature in development

Vectorscope with HDR / WCG support

• Graticules/Targets for SDR and

HDR*

• Tooltip co-ordinate display
• 12-bit resolution
• Zoom to targets
• User definable targets*
• Picture linked cursor*
• SDR, PQ, HLG* and S-log3*

Vectorscope

* Feature in development

Questions?