Metadata is by definition minimal, but for HDR here it is negligable
that is true, but I kept seeing two different things, so I asked when I
saw the chance. Please book me in for both your latest developments
demo, aswell as the Technicolor (taking the commercial/marketing lead)
demo;-).
Of course for 4K or 8K there is no real legacy installed base, the first
commercially available displays since 2009/10 to 2014/5 are not
compatible, but where acquired by early adopters that accepted there was
no real 4K content.
We see this being extended by a staggered deployment strategy with phase
1 and phase 2 UHD (4K), with both EBU and distributors like SES.
See you at IBC,
Donald
Jeroen Stessen schreef op 11-06-2016 16:59:
Hi,
On 2016-06-11 09:18, cooleman@xxxxxx wrote:
Perhaps Jeroen can clarify this, as Mark keeps saying in his presentations that there is a fixed 35KB of metadata per scene, but in on of your materials I read there was a variable amount starting at 7KB/b?
Mark said "35 bytes per scene", not kilobytes !
If we describe our tone mapping function with parameters then it is
only a handful of bytes. In an alternate payload mode we can send
whole tone mapping LUTs[65] and then it is a bit more. We have
recently submitted this to ETSI (EBU) for standardisation. We can send
this data once per scene, or if we choose to vary the tone mapping
during a scene, send it once per frame. I could try to get an exact
number for you but your conclusion would be the same: it is almost
nothing. The actual challenge is to not lose this metadata, and to
apply it synchronously to the image data. Once you have the metadata
in the HDR decoder then you can do wonderful things with it.
Like I wrote, our proposal is backward compatible to legacy SDR, our
signal looks like decent SDR. This compatibility does not harm the
coding efficiency. There seems to be no good reason to drop the
compatibility requirement, except maybe that if you transmit the HDR
and put a decoder in every SDR receiver then the tone mapping does not
have to be invertible anymore, so it may be more aggressive, clipping
harder.
So the question boils down to: who is not afraid of dynamic metadata ?
Please visit us at the next IBC exhibition.
Best,
-- Jeroen
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