>> It's a basic premise of signal processing that you cannot recover data
>> that isn't there any more. Shannon's theorum and all that.
>>
>> Whether you can *fake* something that "looks" right is another matter.
>> But *recover*? No. Impossible.
> 
> At least as far as we know today.

Right. And the fact that a mathematical proof of its impossibility 
doesn't matter either, right?

How many years do you think it will be before somebody solves the 
halting problem, or develops a lossless compression algorithm with an 
infinite compression ratio?

> If you take a photo of something out of focus, you could never recover 
> the original picture again, right?
> 
> Wrong.  http://refocus-it.sourceforge.net/
> 
> Pretty cool plugin.  Even 5 years ago, something like this would have 
> been thought to be totally impossible.

I've always thought that, logically, this ought to be possible in 
principle. I mean, defocusing is basically a convolution, so it should 
be possible to deconvolute it to some degree... (Similarly with echo 
cancellation.)

-- 
http://blog.orphi.me.uk/
http://www.zazzle.com/MathematicalOrchid*

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