InBroadcast - InShow Guide 2017 - 50

50

www.inbroadcast.com | IBC2017 InShow Guide | 15-19 September

Vidchecker
Automates PSE
Compliance
Avoid the negative effects of Photosensitive Epilepsy causing content - don't wait until
the regulations are upon you - learn the facts to put a testing program in place now...
Photosensitive Epilepsy Background
Epilepsy is a neurological condition
where there is a tendency to have
seizures that start in the brain.
Photosensitive Epilepsy (PSE) is when
the seizures are triggered by flashing
lights or contrasting light and dark
patterns. Individuals with PSE can
experience epileptic seizures upon
exposure to certain visual stimuli.
From research done in the UK
and Japan, flashing video, flashing
patterns and saturated red can trigger
PSE seizures in around 1 in 4,000
people.
PSE and Television
Television images can be a common
visual trigger for PSE seizures. The
most common of such likely visual
stimuli for PSE seizures are those that
include flash photography or other
strobing light effects, or very fast cuts
with high luminance changes.
In Japan in 1997, an episode of
the children's cartoon Pokemon
triggered over 750 admissions to the
hospital. In another incident in the
UK in 2012, a TV commercial for a car
manufacturer caused several viewers
to have epileptic seizures and resulted
in numerous complaints to regulators.
Due to this, some countries, most
notably the UK and Japan, place
a legal requirement on television
broadcasters to take steps to reduce
possible triggers for PSE in their video
by testing their content for possible
PSE triggers prior to transmission,
using specifically approved software.
Transmitting video that does not
pass the PSE legal requirements
can result in substantial penalties
(financial and otherwise) for the
broadcaster and severe repercussions
to the program producer.

Fig 1:

Checking for PSE Compliance
Trying to check manually for
compliance to the PSE specifications
is not realistically feasible due to the
detailed levels and thresholds which
must be measured.
As an example see the images below
where the difference between a pass
and fail can be very hard to detect
visually.
The two sets of images are part-only
of a sequence from a video showing a
few frames around a flash.
In the first set (Fig. 1), the luminance
of the central image is such that the
video does not comply with the UK
legal requirements.
The second set of images (Fig. 2)
have been corrected: the luminance
of the flash images has been reduced
fractionally by auto-correction in
Vidchecker. The resulting video
now complies with the UK legal
requirements. (This may be very hard
to see, particularly in printed images.)
The reality is that checking for PSE

compliance requires specific software,
and in the UK at least, video material
can only be delivered to broadcasters
if it has been tested with approved
software and the video is delivered
with a 'pass' test certificate from this
software.
Correcting PSE Testing Failures
In many cases if the video fails the
PSE test, it can be edited to reduce
the PSE-causing effects, but correcting
PSE failures requires highly skilled and
laborious manual work.
Correcting the most common
failures involves editing to reduce
luminance/contrast, re-rendering, rechecking the video for PSE triggers,
and then if it still fails, re-editing the
video again. This process may repeat
many times, is time consuming, costly,
and inexact. Additionally the video
can end up being over-corrected and
looking of lower quality than it needs
to be to meet requirements.

Conclusion
Although currently only the UK
and Japan have mandates in place,
more broadcasters worldwide are
considering requiring PSE testing for
content airing on their networks. As a
content producer or broadcaster, you
need to be prepared for your content
to be tested for PSE compliance. Don't
wait until the regulations are upon
you. Be proactive and start getting
your testing in place today.
Vidchecker
from
Telestream
includes PSE compliance testing as
standard in the product and has been
'an approved device' in the UK for PSE
testing for several years. Vidchecker
also offers automated correction of
flashing failures with corrections done
only to the extent needed to meet the
requirements.
Contact Telestream to learn more
about Vidchecker for PSE testing.
www.telestream.net/vidchecker

Fig 2:


http://www.inbroadcast.com http://www.telestream.net http://www.telestream.net/vidchecker

Table of Contents for the Digital Edition of InBroadcast - InShow Guide 2017

InBroadcast - InShow Guide 2017 - Intro
InBroadcast - InShow Guide 2017 - Cover1
InBroadcast - InShow Guide 2017 - Cover2
InBroadcast - InShow Guide 2017 - 3
InBroadcast - InShow Guide 2017 - 4
InBroadcast - InShow Guide 2017 - 5
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InBroadcast - InShow Guide 2017 - Cover3
InBroadcast - InShow Guide 2017 - Cover4
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