[opendtv] Re: 20060117 Mark's (Almost) Monday Memo
- From: Tom Barry <trbarry@xxxxxxxxxxx>
- To: opendtv@xxxxxxxxxxxxx
- Date: Fri, 20 Jan 2006 20:56:18 -0500
Manfredi, Albert E wrote:
> Except that I *think* what John really wondered is whether
> there is a Shannon's Law equivalent for codecs. That is, a
> theoretical limit to how much a given image (or audio
> stream) can be compressed. This is independent of Moore's
> Law, other than the presumed requirement of more computing
> power needed as compresssion increases.
But we may still be in the stage where computing power dominates.
Imagine you were watching a football game up to a certain point in time.
You could carefully examine all frames (taken at a very high frame
rate) and were asked to draw a picture of the expected next frame.
There were no other rules. You could use any additional tools you wished.
On the average you would probably be able to make a fairly accurate
prediction, leaving very little residual information to be stored. This
process would likely involve some "artificial intelligence" and a
personal model of reality but would really not include much that could
not be machine computed given the power.
I think I once read somewhere that much of intelligence is just an
exercise in data compression. Maybe the reverse is also true.
- Tom
> Craig Birkmaier wrote:
>
>
>>>Is there a Moore's Law regarding codec efficiency, or
>>>is there a theoretical limit? I mean it seems to be
>>>impossible to represent an entire 1920x1080 frame with
>>>a single bit (unless the entire screen is monotone),
>>>so there must be a theoretical limit as to how much you
>>>can compress an image and still have it be a practical
>>>display.
>>
>>An excellent question John. With your permission, I may
>>incorporate it into my column on video compression for
>>the March issue of BE.
>>
>>And i am looking forward to other responses: this could
>>be an interesting thread!
>>
>>Moore's law is certainly a factor, as it provides some
>>indication of what we can expect in terms of
>>computational resources for video compression algorithms
>>in the future. Equally important, it can help us predict
>>the resources that will be available in low cost consumer
>>appliances in the future.
>
>
> Except that I *think* what John really wondered is whether
> there is a Shannon's Law equivalent for codecs. That is, a
> theoretical limit to how much a given image (or audio
> stream) can be compressed. This is independent of Moore's
> Law, other than the presumed requirement of more computing
> power needed as compresssion increases.
>
> Bert
>
>
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