HDR Test Patterns - VideoQvideoq.com/Downloads/VideoQ HDR Test Patterns Training Presentation...VideoQ, Inc. Presentation HDR Test Patterns VideoQ, Inc. Training Presentation May 2017

VideoQ, Inc. Presentation

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HDR Test PatternsVideoQ, Inc. Training Presentation

May 2017www.videoq.com

2www.videoq.comwww.videoq.com

Part 1 – General HDR Info

The following 8 slides contain the background information,

helpful for the optimal selection and usage of VideoQ HDR Test Patterns

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SDR & HDR: Long-term Peaceful Coexistence ?• Currently there are 4 types of video data formats in use: the ubiquitous SDR format, widespread camera

RAW LOG format (de-facto it is the HDR format) and at least two new HDR formats partially defined in ITU BT.2100, SMPTE ST 2084/2086/2094 and other standards:

• HDR-LOG (Camera RAW Video), commonly “anchored” to 18% Gray Light LevelAbsolute Light Levels in nits can be retrieved via Exposure Index (ASA) metadata

• HDR-PQ (Perceptual Quantizer), covering a wide Light Levels Range from 0.001 nits to 10,000 nitsSome experts further split it into Dolby Vision, HDR10 and HDR10plus, though some others see it as one standard

• HDR-HLG (Hybrid Log Gamma), based on the SDR concept of Relative Light LevelsThe HDR-HLG format is promoted as backward compatible to SDR production and distribution, but this is debatable

• Rendition of HDR-PQ and HDR-HLG images by HDR displays depends on a number of factors; production of HDR content in a single format suitable for any HDR display is scarcely possible.

• The critically important Reference White (aka “Diffuse White”) level definition is still in discussion.

• The key tool for setup, calibration, and benchmarking of display devices, video processors, encoders and video production software is the VideoQ HDR Test Patterns Suite.


Dynamic Range Conversion: Essential for HDR Progress• Mixed SDR/HDR environment requires SW and HW engines for auto-enhancement, up-, down- and

cross- conversion within and/or between all four above-mentioned formats.

• All of these processes are related to the optimal choice of mezzanine DR format and architecture of vision mixers/switchers operating in such SDR/HDR environment.

LOG

PQ

HLGSDRSDR

LOG

PQ

HLG

DR Up-conversion DR Down-conversion

LOG

PQ

HLG

LOG

PQ

HLG

DR Cross-conversion







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Mixed Dynamic Range Workflow

Front-endAssignable DR Converters

Main Mixer Unit

Back-endAssignable DR Converters

SDR/HDR Vision Mixer

HDR-HLG PGM Out

HDR-PQ PGM Out

SDR PGM Out

HDR-PQ AUX Out

SDR PREVIEW Out

HDR-HLG PREVIEW Out

HDR-PQ PREVIEW Out

HDR-LOG Inputs

HDR-HLG Inputs

SDR Inputs

HDR-PQ Inputs Mezzanine DR Format:LOG, PQ, HLG or …?


Y, R, G, B Signals and Light Levels

Narrow (aka “Broadcast”) Video Data Range, e.g. 10 bit values 64 … 940

0

0 1

1

Relative

Light

Level

Ref. Black Ref. White

Full Video Data Range, e.g. 10 bit values 0 … 1023

Relative Signal Level: 0 …1

Relative Y, R, G or B Signal Levels (SL)

convert to Relative Light Levels (LL) via the

Electro-Optical Transfer Function (OETF).

For the Standard Dynamic Range (SDR) TV

system the OETF is quite simply: LL = SLDG ,

where DG (Ref. Display Gamma) = 2.4.

The Max Relative Light Level (LL = 1) refers

to the Light Level of any particular SDR

device producing the light output, which

corresponds to the specified value of

Target Device Max Brightness (TDMB),

typically expressed in cd/m2 (or nits).

Absolute Light Level values, e.g. LL in nits,

are easily calculated by multiplication of the

relative LL values by TDMB value in nits.Note: The numerical value of LL is equal to the

display screen Brightness in nits only on shades

of Gray.

For any other color the LL value in nits is greater,

e.g. for saturated Blue the LL value could be 13.8

times greater than Brightness – see next slides.

Y

0 64 940 1023

RGB

Sub-ranges providing

headroom for signals

under-shoots and over-

shoots

SDR

Ref. White Light Level







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Y, R, G, B Signals and HDR-PQ Light Levels


0 nt

0 1

10,000 nt

Absolute

Light

Level

Ref. Black



Unlike SDR TV, in the HDR-PQ format the

Electro-Optical Transfer Function (OETF)

set the conversion law of relative Y, R, G or B

Signal Levels to absolute Light Levels.

HDR-PQ OETF formula is quite complex,

it can be found in

the ITU-R BT.2100 standard (Table 4).

For HDR-PQ the Max Relative Light Level (LL

= 1) refers to the Light Level of an assumed

ideal device producing 10,000 nt output.

The max output of a typical HDR display is

significantly lower than 10,000 nt (10 knt).

This means that HDR-PQ content must be

produced and/or converted for a variety of

Target Device Max Brightness (TDMB) values.

Note that Ref. White (“Diffuse White”) level is

not yet defined – the issue is still pending.

For more details – see next slide.

Y

0 64 940 1023

RGB In practice, the sub-range

1…10 knt is often used only

for specular highlights – on

condition that they should

not take a significant share

of the screen area!

1,000 ntHDR-PQ

SDR

720

Absolute Max Light Level

Example:

TDMB = 1,000 nt


HDR-PQ Target Device Max Brightness


0 1

Absolute

Light

Level

Ref. Black



Target Device Max Brightness (TDMB) value

is the key parameter affecting the production,

conversion and metadata preparation for a

given piece of HDR-PQ content.

Currently, the most common TDMB value is

1,000 nt (1 knt). Such a light output limit is

present in both production monitors and

consumer displays.

The absolute 10,000 nt limit of the PQ format

for these devices is just an unreachable point,

or in more optimistic words – “reserved for

future use” headroom.

Y

0 64 940 1023

RGB

In TDMB = 1 knt mode the

sub-range 1…10 knt is not

used by the specified device

– all gradations are clipped

at 1 knt limit

1,000 nt

720

Example:TDMB = 1 knt

HDR-PQ Format Limit: TDMB = 10 knt 10,000 nt

0 nt

Clipped LL Range

rendered as 1 knt







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Y, R, G, B Signals and HDR-HLG Light Levels


0

0 1

1

Relative

Light

Level

Ref. Black



Similar to SDR TV, in HDR-HLG format

the relative Y, R, G or B Signal Levels (SL)

convert to the relative Light Levels via the

Electro-Optical Transfer Function (OETF).

The HDR-HLG OETF formula is a combination

of the SDR curve reduced to 75% of the signal

range and a “soft knee logarithmic function”,

occupying upper 25% of the signal range.

Full HDR-HLG EOTF formula can be found in

the ITU-R BT.2100 standard (Table 5).

For the HDR-HLG format, the Max Relative Light

Level (LL = 1) is 3.8 times higher than the

Reference White Light Level. In other words Ref.

White (“Diffuse White”) LL is defined as 26.3 %

of the max possible display light output.

Note that, unlike HDR-PQ, HDR-HLG signal can

be rendered by any display, even by any old-

fashioned SDR display, though, for best results

some contrast adjustment may be needed.

Y

0 64 940 1023

RGB This sub-range is used

mainly for specular

highlights – on condition

that they should not take a

significant share of the

screen area!

LL = 0.263

HDR-HLG

SDR

720

Ref. White

Ref. White

HDR-HLG Format Limit: LL = 1 (100%)


Light Level Models and Units of Measurement1. Classical CIE standard definitions of Luminance and related TV screen pixel Brightness parameter (in cd/m2)

should not be confused with de-facto parameter of SDR & HDR Light Level, which regretfully is often expressed in the same units, such as cd/m2.

2. Light Level values are useful only within the assumed mathematical model, created for a particular purpose:• By default, the purpose of the SDR/HDR model is to simulate a human observer estimation of color image intensity.

For this purpose the EOTF(max(R,G,B)) operator is applied to all pixels of the video frame, e.g. to get widely used Frame-Average Light Level (FALL) value in nits.In accordance with this model the LL value (perceived intensity) for the Color Bars Test Pattern Blue Bar is equal to the White Bar, whilst CIE Brightness value

for the Blue Bar is more than 13 time lower than for the White Bar.For RGB color spaces that use the ITU-R BT.709 primaries CIE Brightness function is 0.2126xEOTF(R) + 0.7152xEOTF(G) + 0.0722xEOTF(B).The formula reflects the luminosity function: green light contributes the most to the intensity perceived by humans, and blue light the least. But in accordance with the abovementioned max(R,G,B) alternative model they produce equal contributions!

• If the model’s purpose is the estimation of OLED display power consumption for various video content samples, then for each video clip the (EOTF(R) + EOTF(G) +EOTF(B))/3 operator is applied to all pixels of all frames. Obviously, in this case the LL numerical values (in nits) may differ significantly from the case above.

3. Thus, it is highly desirable to state the model used and state the unit – e.g. “DR model nits (mnt)”.If it is clear from the context that it is about LL values, then ubiquitous nt unit name may be used, but cd/m2 units should be avoided

whenever possible, because they are reserved by international standard for CIE Brightness.







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Part 2 – VideoQ HDR Test Patterns

The following slides contain

the detailed description

of VideoQ HDR Test Patterns Suite


VideoQ HDR Test Patterns ApplicationsPicture quality control and calibration tools for general public, video installers, hardware and software developers, video development labs, production, post-production and content distribution facilities in the fields of:

� Broadcast HD & UDH TV

� Consumer Electronics

� Video Transcoding

� Video Data Compression

� Digital Cinema

� Home Theatres

� IPTV, CDN

� Cloud video processing and transcoding







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VideoQ HDR Test Patterns Data FormatsAll test patterns are available in raw data YUV format and high bitrate MP4 format:

� Raw data format: 4:4:4 planar YUV, 10 bit per component, 30 bit per pixel

� Compressed MP4 format:

� Seamless loop duration: 30s (typical value),

� Pixel format: 444p10le (HEVC level 6.2) or 422p10le (HEVC level 5.1),

� IPPP… GOP size: 1s

� HDR-PQ or HDR-HLG metadata embedded – as appropriate

� Frame size: 3840x2160 (UHD)

� Frame rate:

� Raw YUV data: any frame rate,

� MP4: 23.976 fps = default, other frame rates available on request

� Audio data: N/A


VideoQ HDR Test Patterns Suite – Entry Level Set

Static Multi-Purpose Chart.A sophisticated test pattern for display setup, image quality visual assessment and processing chain performance check

VQMPC

N/ASuper PLUGE (Conical Grayscale) test pattern for the HDR-PQ displays performance check for very low light levels.The Light Level Range is 0.001 nt … 2 nt

VQSP

N/AAverage Picture Level dynamic sequence for testing display auto-brightness control performance. Featuring a static photo on a calibrated variable light level background. FALL range is 75 nt … 1000 nt

VQAPL

Static Display Setup test pattern for general light levels range and tone-mapping quality assessment. With a large “Butterfly” image inserted, suitable for demos and exhibitions

VQDS

Static Levels Alignment test pattern for metadata handling, displayed light levels range and tone-mapping performance check

VQLA

HLG versionPQ versionDescriptionCodename







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VQLA Test Chart: PQ version


VQLA Test Chart: HLG version







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VQLA Test Composition

Black PLUGE rectangles andBlack SPLUGE Conical Grayscaleon Reference Black backgroundaimed at testing Display Min Brightness

7 White SPLUGE Conical Grayscales aimed at testing Display Clipping Levels

Special HDR Color Barsaimed at testing Display Light Output Profile

Special HDR Grayscaleaimed at testing Display Light Output Profileand Clipping Level

10 Two-tones Patches aimed at testing Display Clipping Levels

Valid Range 10 bit Linear Rampwith critical levels markersaimed at testing Display Tone-mapping Uniformity (“Banding”)

Precise FALL & CLL readoutaimed at calibration & testing of Content Levels Analyzers

10 Two-tones Patches aimed at testing Display Clipping Levels


Black PLUGE & Black SPLUGE Usage

Clipped sector (with no shades of gray) is much more than 180 degrees

Clipped sector (with no shades of gray) is much less than 180 degrees

Conical grayscale is clipped exactly half-circle (180 degrees), no shades of gray on the left half

Fine Tuning (SPLUGE) Coarse Tuning (PLUGE)

Note that some versions do not contain fine tuning SPLUGE components

All rectangles on the right and some rectangles on the left are visible

Brightness is too high

Brightness is correct

Brightness is too low

Not all rectangles on the right are visible

All rectangles on the right are visibleand all rectangles on the left are not visible







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Rendered VQLA-PQ Example: TDMB = 5,000 nt

4 ... 5 knt and 5 … 6 knt Two-tones Patches: 5 knt Circle within 4 knt Square is visible,6 knt Circle within 5 knt Square is not visible,, i.e. Light Levels are clipped at about 5 knt

0.1 ...10 knt White SPLUGE: shows clipping boundary at 5 knt


Rendered VQLA-PQ Example: TDMB = 1,000 nt1 ... 2 knt Two-tones Patch: 2 knt Circle within 1 knt Square is not visible, i.e. clipped at 1knt level

0 ... 1 knt Grayscale: shows no clipped levels,i.e. the specified TDMB range is properly rendered

0.1 ...10 knt White SPLUGE: shows clipping boundary at 1 knt







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Rendered VQLA-HLG Example

10 steps Grayscale aimed at testing Display Gamma

(Gradations Mapping LUT)

RGB Max = Reference White = 720 (10 bit),RGB Min = Reference Black = 64 (10 bit)

RGB Max = Maximum White: 940 (10 bit)

RGB Max = Video Data Range Upper Limit: 1020 (10 bit)

Small circles at the top of each bar

represent specular highlights going

beyond the legal range.

Display shall exhibit correct response:

The highlighted circles should be

clipped to the same level as the main

body of the corresponding bar, without

any noticeable artifacts.


VQDS Test Chart: PQ version







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Rendered VQDS-PQ Examples

Target Device Max Brightness: 1,000 nt

Target Device Max Brightness: 5,000 ntTarget Device Max Brightness: 500 nt


VQDS Test Chart: HLG version







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Rendered VQDS-HLG Examples

Compatible SDR Image: 50% of HLG Light RangeFull HLG Light Range Image


VQMPC Test Chart: PQ version







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VQMPC Test Chart: HLG version


VQMPC Test FeaturesMulti-purpose test pattern to check at glance:

� Geometry: Aspect Ratio, Overscan and "Ultra-wide Mode" effects of the display

� Scaling Quality or proof of no-scaling, especially in case of DHCP conflict in STB

� Colors, Gradations and Light Levels:

� PLUGE, SPLUGE and special HDR Color Bars for display setup,

� Two Photo Inserts for general quality evaluation

� 2D Frequency Response

� Sharpness Correction settings & controls

� Display setup and Dynamic Range Mode settings & controls







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VQMPC Test CompositionFour Corner Radial Plates

aimed at testingGeometry & Sharpness

Vertical Ruler, Vertical Frequency Bursts

Four H & V Edge Markers

White line width = 1 pixel

Central “Katie” Photo 0.5*H Insertaimed at checking Color Rendition

Horizontal Ruler,Horizontal Frequency Bursts

Six Black PLUGE rectangles and SPLUGE Conical Grayscaleon Reference Black background

aimed at testing Display Min Brightness

“Butterfly” Photo 0.25*H Insertaimed at checking full HDR range

Color Rendition

Diamond Linesaimed at testing picture

Geometry

Special Color Barsaimed at testing

HDR Display Light Output Profile

Mid-gray background aimed at testing

Display Light Output Uniformity

Chroma Sampling Testaimed at testing

Encoded YUV Pixel Format

Chroma Gain Testaimed at testing

Chroma Saturation

OETF Curve Testaimed at testing

HDR Display Tone-mapping

White SPLUGE Conical Grayscale aimed at testing

Display Clipping Levels


VQMPC: Diamond Pattern and Crop Markers Usage

Example of correct settings (no cropping):All picture edges are not cropped and single pixel white markers are visible

Example of incorrect settings (with cropping):Picture edges are cropped







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VQMPC: Tri-band Combination Burst Patterns

There are two groups of bursts with frequencies proportional to luma pixels rate FY: full length horizontal bursts band and full height vertical bursts band.Maximum luminance frequency burst of exactly 0.5 FY is in the middle of each band. Two slightly oblique bands of 0.4 FY surrounds the middle burst.

Two central 0.5 FY sub-bands are especially sensitive to any errors in pixel clock, mapping or scaling. Four other sub-bands allow differentiation between horizontal and vertical distortions thru the whole picture area – from left picture edge to the right picture edge and from top to bottom.

Within the burst vertical and almost vertical lines test horizontal frequencies, whilst horizontal and almost horizontal lines test vertical frequencies.

0.4*FY Near Horizontal Burst

0.5*FY Vertical Burst

0.4*FY Near Vertical Burst0.4*FY Near Horizontal Burst 0.5*FY Horizontal Burst 0.4*FY Near Vertical Burst


VQMPC: Tri-band Combination Burst Pattern Usage

Example of correct settings (no scaling):There are no visible beat waves on both horizontal and vertical Tri-band Patterns

Example of scaling artifacts:Scaling causes beat waves on both horizontal and vertical Tri-band Patterns







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VQMPC: Radial Plates Usage

Original Size – dot-by-dot: Full contrast of fine details in all directions

Scaled (Up or Down) Picture, or Sharpness Correction sub-optimal settings:Loss and/or distortion of fine details


VQMPC: Chroma Sampling Test DetailsFSh: Original Horizontal Sampling Rate

FSv: Original Vertical Sampling Rate

Checkerboard FSh/2, FSv/2

H & V Scaling Detector Arealooks like checkerboard only in

absence of any conversion vs. pristine 4:4:4 YUV/RGB

FSh/2FSh/4FSh/8FSh/16 FSv/16FSv/8FSv/4FSv/2

4:2:2 and 4:1:1 (UV H sub-sampling) Detection Area 4:2:0 (UV V sub-sampling) Detection Area







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VQMPC: Chroma Sampling Test Usage Example

Pristine 4:4:4?No

4:2:0 (UV V sub-sampling)? Yes

4:2:2 or 4:2:0 (UV H sub-sampling)?Yes

Dedicated areas indicate different sub-sampling issues:

Sampling Conversion Test Result:4:2:0 sub-sampling mode detected

Test appearance after different codecs

4:2:2 or 4:2:0 (UV H sub-sampling)?Yes

Sampling Conversion Test Result:4:2:2 sub-sampling mode detected

Pristine 4:4:4?No

4:2:0 (UV V sub-sampling)? No

Case #1 Case #2


VQMPC: OETF Test Details and Usage ExampleFSh: Original Horizontal Sampling RateFSv: Original Vertical Sampling Rate

Checkerboard: FSh/2, FSv/2

For an average human observer the high frequency checkerboard textures are visible only from a very small viewing distance. From a normal UHD viewing distance the central squares look like solid gray.If the display OETF complies with the standard curve, then the average gray levels should match the background squares gray levels, i.e. the contrast of the central squares vs. the background is very low.

Case #1:The display EOTF at 400 nt level is close to the PQ standard (correct function curve)

Case # 2:The display EOTF at 400 nt level significantly differs from the standard curve







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VQMPC: Chroma Gain Test Details and Usage ExampleFSh: Original Horizontal Sampling RateFSv: Original Vertical Sampling Rate

Checkerboard: FSh/6, FSv/6

For an average human observer the high frequency checkerboard Green-Magenta texture is visible only from very small viewing distance. From normal viewing distance the central square looks like solid gray.If the display chroma gain (saturation) is close to the nominal value (nominal gain = 1.0), then the central square average gray color should match the background gray color, i.e. the contrast of the central square vs. the background is very low.Note that the actual shades of gray perceived by the observer are affected by the display EOTF, thus the Chroma Gain Test depends on the success of the EOTF Test shown on the previous slide.

Case # 1:The display color saturation (chroma gain) is close to the nominal value

Case # 3:The display color saturation (chroma gain) is much higher than the nominal value

Case #2:The display color saturation (chroma gain) is much lower than the nominal value


Rendered VQMPC-PQ Examples

Target Device Max Brightness: 1,000 nt

Target Device Max Brightness: 5,000 ntTarget Device Max Brightness: 500 nt







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Rendered VQMPC-HLG Examples

Full HLG Light Range Image

Compatible SDR Image: Max LL = 50% of HLG Range Compatible SDR Image: Max LL = Ref.White (26% of HLG Range)


VQMPC: HDR Color Bars Test Details and Usage Example

The special HDR-PQ “shallow” Grayscalefeatures uniform light levels steps up to 100 nt

8 White PLUGE components (nested squares)

Case 2:Clipping at 10 bit value of 940 as required by HDR standard:- It is normal for all HLG displays, - It is also normal for the PQ displays capable of rendering

the full valid range, i.e. if TDMB = 10,000 nit

Case 1:The HDR display renders the full 10 bit video data range without clipping at the level 940; this is not allowed by any HDR standard (PQ or HLG)

White PLUGE 10 bit levels:860

940 = upper limit of valid (“Narrow”) 10 bit video data range

1020 = upper limit of full 10 bit video data range

Case 3:The display is not rendering full valid range; the clipping is at a video level much lower than 940:- It is not normal for any HLG display,- It is normal for the PQ displays with a TDMB < 10,000 nit

Special HDR-PQ 100 nt Color Bars

Special HDR-HLG Ref. White Color Bars

The special HDR-HLG “shallow” Grayscalefeatures uniform light levels steps up to Ref. White







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VQSP-PQ – Very Low Light Levels TestRaw YUV Data Image Target Device Max Brightness: 200 nt

If the processing chain preserves the full 10 bit resolution and the display black level cut-off point setup is correct (i.e. the display under test OETF complies with the standard PQ curve), then all the gray levels, even the very low, e.g. 0.001 nt, should be visible.

This test is for viewing in a dark room (i.e. very low ambient light levels), and the observer should be given enough time for the visual system adaptation to these conditions. Rendering of low light levels is relatively easy for not so bright displays, for brighter displays this test would be much more challenging.


VQAPL-PQ Dynamic TestFirst frame – lowest FALL value Last Frame – highest FALL value

TimeThis dynamic sequence serves to test the display’s auto-brightness control system.

The HDR display can include eye safety and power consumption protective measures, e.g. automatic reduction of the light output, when the content variable light level (FALL value) goes above some threshold. However, such protection should not be accompanied by a significant distortion of the central insert image, and the recovery time (recovery here means full return to normal mode after FALL value drop-down) should not be too long.







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Part 3 – Additional VideoQ UHD Test Patterns

The following slides contain

the description

of VideoQ UHD Test Patterns

recommended for pre-testingprior to the full HDR test procedures


VQV“Visualizer”

Workflow

Test Pattern Fileselected by User

CaptureCardProcessor,

EncoderCapturedYUV Data

=.YUV File

VQMAAnalyzer

VQMA Test Reports

DevicesUnder Test

Reference Decoder

SW Video Encoder

Video Player

Test Patterns Library

MasterPlayer

Main QC Monitor

HDMI / SDI

Test Setup

HDMI / SDI

WaveformScope

More QC Tools







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MPCAVS – UHD Dynamic Test Pattern with AV Sync ComponentsFour Corner Radial Plates

aimed at testingGeometry & Sharpness

Vertical Ruler, Vertical Frequency Bursts

Four H & V Edge Markers

line width = 1 pixel

Central Photo 0.5*H Insertaimed at checking Color Rendition

AV Sync Error Circular Graticule:coarse +/-3000 ms scale = “red” range

&fine +/- 500 ms scale = “green-and-brown” range,

Horizontal Ruler,Horizontal Frequency Bursts

AV Sync Test:Orbiting Ball (2 speeds), Flashing Green Marker

Four Tri-levelWhite PLUGE boxes

aimed at testing YRGB max levels

Four Tri-level Black PLUGE boxes

aimed at testing YRGB min levels

Frames CounterVideo Continuity Test Large 0.7*H Circle and Diamond Lines

aimed at testing picture GeometryAudio component “Beep-bop” burst: both L&R of 2.0 stereo or Center Channel of 5.1 surround sound, period = 6 s


MPCAVS: AV Sync Test Audio Component Time-line

Lf

Rf

Cf

Lr

Rr

LFE

Loop duration: 6,000 ms (6,006 ms for 23.976, 29.97 and 59.94 fps)

AV Sync Reference Position = 3000 ms (3003 ms for 23.976, 29.97 and 59.94 fps)

Beep:1250 Hz, 400 ms

Bop:1000 Hz, 200 ms

AV Sync Reference: “Beep-bop” burst







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VQCXS – Color Space Explorer TM Dynamic Test

In 50 seconds this sophisticated dynamic source tests more than one billion (10243) colors of the 10 bit YUV color space. Thus it covers all combinations of Y, U and V values – from 0 to 1023, including all “illegal” colors.

VQCSX is equally suitable for SDR, HDR-PQ and HDR-HLG systems, checking processors, codecs and display performance. VQCSX is also suitable for both visual and instrumental tests, the results are visible on regular video monitors, waveform monitors and/or vectorscopes. VQCSX is especially efficient in combination with the VideoQ VQV Viewer-Analyzer tool.

Time


VQCSX Usage Examples: HDR-PQ & HDR-HLG

VQCSX is equally suitable for testing HDR-PQ and HDR-HLG. Screenshots above are the examples of VQCSX usage in combination with VideoQ VQV Viewer-Analyzer.The rendered UV color palettes and vertical grayscales on the test pattern edges are very different due to the significant difference between PQ and HLG EOTFs. In the PQ 1000 nit rendering mode the PQ 1000 nit grayscale (on the right edge) shows the full light range without clipping, whilst the HLG grayscale (on the right edge) is clipped. This is reversed on the right screenshot (HLG rendering mode).







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VQPL – Packet Loss and Frame Continuity UHD Test


VQMATM – UHD Test Pattern for Automated Analysis

Color BarsYUV/RGB Levels,Color Space Matrix

Multi-Burst

Geometry (Scale/Position/Tilt/Keystone) Markers x4

Multi-pulses Needle pulse K-rating

Frequency Response,Aliasing Levels

Y vs. UV Gain,

All-In-One: Single pattern allows automatic measurement of multiple video signal parameters

Parameters:Test Signals:Radial Plates x4 for visual estimation, camera shading and sharpness measurement

0

1

2

3

4

5

Grayscales x2,Near-Whites, Near-Blacks

Black & White Levels, RGB Balance,Y Gamma, Y Range Overload

Visual EstimationH Wedges V Wedges

Original Frame Size Code, 4 bitSpinning Frame ClockChroma Sampling

Test

Frames Cadence Test







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About VideoQCompany History• Founded in 2005

• Formed by an Engineering Awards winning team sharing between them decades of global video technology.

• VideoQ is a renown player in calibration and benchmarking of Video Processors, Transcoders and Displays, providing tools and technologies instantly revealing artifacts, problems and deficiencies, thus raising the bar in productivity and video quality experience.

• VideoQ products and services cover all aspects of video processing and quality assurance - from visual picture quality estimation and quality control to fully automated processing, utilizing advanced VideoQ algorithms and robotic video quality analyzers, including latest UHD and HDR developments.

Operations• Headquarters in Sunnyvale, CA, USA

• Software developers in Silicon Valley and worldwide

• Distributors and partners in several countries

• Sales & support offices in USA, UK




Documents

HDR Test Patterns - VideoQvideoq.com/Downloads/VideoQ HDR Test Patterns Training Presentation...VideoQ, Inc. Presentation HDR Test Patterns VideoQ, Inc. Training Presentation May 2017