In Broadcast - July 2016 - 72


72

www.inbroadcast.com | Vol: 6 - Issue 7 | July 2016

InTech

Evaluating The Quality
Of HDR Video Content
UHD / 4K video offers a more immersive viewing experience, the next level of picture realism
is provided by high dynamic range imagery, Video Clarity has the tools to test this content
throughout the delivery chain, writes Adam Schadle...

T

hanks to pixel density about four
times that of HD, 4K technology
delivers a more immersive viewing
experience with never-before-seen
levels of clarity. And if 4K provides
the crisp picture, high dynamic range
(HDR) provides the detail. Applying
HDR colour technology to 4K images
enhances the picture by delivering
greater contrast, increased luminance,
and an expanded colour gamut - and
the result is unprecedented realism.
HDR provides a compelling reason
for people to make the switch
from HD televisions to UHD TVs,
and it's a compelling reason for
broadcasters and delivery-equipment
manufacturers to perfect the process
of applying a wider colour gamut to
UHD television. (Sooner or later it will
likely become a requirement, probably
based on the BT.2020 colour space
recommendation.)
For 4K HDR content to make it from
the camera to the television today, it
has to go through a colour-conversion
process during encoding. There are
various proposed ways to do that, such
as PQ with BT.2020, HLG with BT.2020,
and an approach that uses ICtCp colour
components. The industry is studying
all of those formats and techniques
right now, but at the moment there is
no standard.
Meanwhile, viewers (and advertisers)
expect to see accurate HDR content -
an expectation that will only increase

with time. Therefore, we must be able
to study the visual and perceptual
differences that result from enhanced
colour space and HDR.
Fortunately, it is possible to do
a side-by-side, visual comparison
between an HDR source and the
downstream version that appears
on the viewer's end. Video Clarity
has some unique tools to make the
most of this subjective approach, and
importantly, it works with any means
of colour conversion available today.
Subjective Interactive Comparison
The best way to subjectively analyse
and compare two different sequences
is to look at them on the same video
display. Using two different displays,
even of the same type, requires
vigilant calibration, which can slow
down the process and leave room for
error. Video Clarity's ClearView 4K
video quality analyser now provides
an effective way to judge HDR video
sequences on the same monitor, which
was not possible before.
The latest version of ClearView
4K ensures that the HDR source is
properly converted to YCbCr upon
import in compliance with ITU-R
BT.2020, and it checks that the signals
are aligned at output. It also supports
high dynamic range by allowing
interactive, side-by-side comparison
of HDR video clips in the Rec. BT.2020
colour space.
Meanwhile MultiPlayer,
an optional application
for ClearView 4K systems,
can automatically and
interactively
select
sequences for side-byside playback in multiple
video formats on up to
eight screens at once -
the only such product
that can do that.
Together these products
provide
a
powerful
way to perform visual
comparisons at different
resolutions and screen

sizes to see results and subjectively
rate the imagery. They can also
perform JND and DMOS calculations,
which give engineers a numerical
benchmark for quality.
The defining characteristic of the
ClearView products is their interactive
comparison function. They are the only
tools on the market that can rearrange
data on the fly so that any viewing
mode is available instantaneously. You
simply select a comparison view, and
playback starts immediately, with no
pre-rendering required.
ClearView viewing modes are:
* Side-by-side;
* Split mirror;
* Seamless split;
* A minus B with threshold
command;
* A minus B with addback
command.
Side-by-side and split-mirror modes
show only half of the image so that you
can pan the sequences. In seamless
split mode, part of the image comes
from the reference and the rest comes
from a processed version. In any case,

MultiPlayer, for ClearView 4K
systems, can select sequences
for side-by-side comparison

ClearView lets you move the split
point on the fly. Meanwhile, A minus
B mode provides an easy way to view
pixel-intensity differences between
two images. All of these views get
fed simultaneously to the ClearView
GUI and to each of ClearView's fullresolution video outputs. You also
have the option to feed them to a
separate desktop window.
Besides those exclusive subjectiveviewing capabilities, with a simple
button push ClearView can measure
any piece of HDR video regardless
of the HDR colour format at play. As
a result, you can switch seamlessly
between
colour
spaces
(and
between SDR and HDR measurement
workflows). Best of all, no matter what
the requirements are in the future,
you'll be able to rely on ClearView to
cover all of them simply by upgrading
the software.

Adam Schadle is the Vice President
of Video Clarity.


http://www.inbroadcast.com http://videoclarity.com/PDF/ClearViewDataSheet.pdf http://videoclarity.com/PDF/ClearViewDataSheet.pdf

Table of Contents for the Digital Edition of In Broadcast - July 2016

In Broadcast - July 2016 - Intro
In Broadcast - July 2016 - Cover1
In Broadcast - July 2016 - Cover2
In Broadcast - July 2016 - 3
In Broadcast - July 2016 - 4
In Broadcast - July 2016 - 5
In Broadcast - July 2016 - 6
In Broadcast - July 2016 - 7
In Broadcast - July 2016 - 8
In Broadcast - July 2016 - 9
In Broadcast - July 2016 - 10
In Broadcast - July 2016 - 11
In Broadcast - July 2016 - 12
In Broadcast - July 2016 - 13
In Broadcast - July 2016 - 14
In Broadcast - July 2016 - 15
In Broadcast - July 2016 - 16
In Broadcast - July 2016 - 17
In Broadcast - July 2016 - 18
In Broadcast - July 2016 - 19
In Broadcast - July 2016 - 20
In Broadcast - July 2016 - 21
In Broadcast - July 2016 - 22
In Broadcast - July 2016 - 23
In Broadcast - July 2016 - 24
In Broadcast - July 2016 - 25
In Broadcast - July 2016 - 26
In Broadcast - July 2016 - 27
In Broadcast - July 2016 - 28
In Broadcast - July 2016 - 29
In Broadcast - July 2016 - 30
In Broadcast - July 2016 - 31
In Broadcast - July 2016 - 32
In Broadcast - July 2016 - 33
In Broadcast - July 2016 - 34
In Broadcast - July 2016 - 35
In Broadcast - July 2016 - 36
In Broadcast - July 2016 - 37
In Broadcast - July 2016 - 38
In Broadcast - July 2016 - 39
In Broadcast - July 2016 - 40
In Broadcast - July 2016 - 41
In Broadcast - July 2016 - 42
In Broadcast - July 2016 - 43
In Broadcast - July 2016 - 44
In Broadcast - July 2016 - 45
In Broadcast - July 2016 - 46
In Broadcast - July 2016 - 47
In Broadcast - July 2016 - 48
In Broadcast - July 2016 - 49
In Broadcast - July 2016 - 50
In Broadcast - July 2016 - 51
In Broadcast - July 2016 - 52
In Broadcast - July 2016 - 53
In Broadcast - July 2016 - 54
In Broadcast - July 2016 - 55
In Broadcast - July 2016 - 56
In Broadcast - July 2016 - 57
In Broadcast - July 2016 - 58
In Broadcast - July 2016 - 59
In Broadcast - July 2016 - 60
In Broadcast - July 2016 - 61
In Broadcast - July 2016 - 62
In Broadcast - July 2016 - 63
In Broadcast - July 2016 - 64
In Broadcast - July 2016 - 65
In Broadcast - July 2016 - 66
In Broadcast - July 2016 - 67
In Broadcast - July 2016 - 68
In Broadcast - July 2016 - 69
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In Broadcast - July 2016 - 71
In Broadcast - July 2016 - 72
In Broadcast - July 2016 - 73
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In Broadcast - July 2016 - 76
In Broadcast - July 2016 - 77
In Broadcast - July 2016 - 78
In Broadcast - July 2016 - 79
In Broadcast - July 2016 - 80
In Broadcast - July 2016 - S1
In Broadcast - July 2016 - S2
In Broadcast - July 2016 - S3
In Broadcast - July 2016 - S4
In Broadcast - July 2016 - S5
In Broadcast - July 2016 - S6
In Broadcast - July 2016 - S7
In Broadcast - July 2016 - S8
In Broadcast - July 2016 - S9
In Broadcast - July 2016 - S10
In Broadcast - July 2016 - S11
In Broadcast - July 2016 - S12
In Broadcast - July 2016 - S13
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http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201701
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_INREVIEW2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201612
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201611
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOWNYexpo
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_20110708_DEMO
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201610
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_inshowguide2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201609
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201608
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201607
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201606
http://europe.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC03
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201605
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2016
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201604
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201603
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2016
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201602
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201601
http://www.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC02
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201512
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201511
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_CCW15expo
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201510
http://www.nxtbook.com/nxtbooks/lesommet/inbroadcast_APAC01
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201509
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_IBC2015
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http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_BROADCASTASIA2015
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http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201504
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_NABSHOW2015
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201503
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_cabsat2015
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http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201501
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201412
http://www.nxtbook.com/nxteu/lesommet/inbroadcast_201411
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201410
http://europe.nxtbook.com/nxteu/lesommet/inbroadcast_201409
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