[opendtv] Re: Precision

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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