[opendtv] Re: HDR upconversion
- From: "Manfredi, Albert E" <albert.e.manfredi@xxxxxxxxxx>
- To: "opendtv@xxxxxxxxxxxxx" <opendtv@xxxxxxxxxxxxx>
- Date: Sun, 12 Jun 2016 00:00:19 +0000
Jeroen Stessen wrote:
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.
Yes, that's what I was thinking too. In principle, we could change the TV
transmission standards entirely, and HDMI etc., e.g. as ATSC 3.0 is doing
anyway, always transmit using the HDR mapping, and then impose the HDR -> SDR
conversion on any SDR receiver individually. That would be a major hassle, for
the installed base, except in special cases like ATSC 3.0, which provide the
timely opportunity.
But, I think, that would actually require more channel bandwidth, than the
clever companding scheme that only requires a few bits of metadata per scene,
no? For instance, such a straight HDR transmission would not steal back
"wasted" bits from the bright whites, presumably. So perhaps your companding
scheme should also be marketed also as a "data compression technique."
Bert
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