On 20/08/2013 16:52, Richard Gaskin wrote:
This is why I love this community:
...
Collectively, there's nothing we can't solve. :)
--
Richard Gaskin
I've often thought that if I had *any* technical question, I could ask
this list and there would be someone who knew (or at least had a very
good idea of) the answer. So here goes ... :-)
Every night when I watch the news on TV, they say something like "Here's
(John Smith) at the news conference held this afternoon. Warning - this
report contains some flash photography".
Now I know why they give this warning - that repeated rapid flashing
from still cameras can cause problems for nystagmus, epilepsy and
various other disease sufferers.
What I don't know is why they don't just digitally edit out the
flashing. Surely this must be (relatively) easy Digital Video Processing
- you detect a non-trivial part (10% threshold??) of the frame which
increases in light level for a single frame (assuming anything between
20 and 60 fps) and then returns to its original levels.
OK - I know almost nothing about DVP, but if they can overlay a
touchdown line on a football field, or change a Coke to Pepsi can, or
all those other marvels, surely it can't be that hard to eliminate 95%
of the flashing - and wouldn't that would be enough to reduce it below
the trigger point for most vulnerable viewers. It needn't even be done
in real time - it could be left as a warning for any live showing, and
then automatically removed by program and checked by a human editor
before subsequent showings.
-- Alex.
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