[opendtv] Re: Precision
- From: Craig Birkmaier <craig@xxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Mon, 28 May 2007 13:39:44 -0400
At 12:41 PM -0400 5/28/07, Tom Barry wrote:
All this is good but it would seem there would also be a point where
you don't need any noise or dithering because you were storing and
displaying sufficient colors/bits such that the HVS could not see
the difference anyway. Just on principle I'd like to get to that
point.
And I worry that once you add (or keep) noise it becomes
information, subtracting from the available bit budget. We already
live with this in the various film grain debates that pop up
periodically.
In theory this sounds wonderful. But in practice it is difficult to achieve.
The whole point of using digital video compression is to:
1. Remove redundancy - this is why temporal coding typically
contributes significantly more coding gain than spatial coding. If
done well this can be virtually lossless.
2. Substitute correlated noise for picture information - this is what
we do when we quantize away high frequency image details. This is
ALWAYS lossy.
Bottom line, the better we can do at predicting what adjacent frames
look like, the more bits we have to preserve the high frequency
details.
Regards
Craig
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