Hi, Matthew,
Quote:
Originally Posted by MathewLodge  That said, I still get surprised in an "information-theory" sense by image processing stuff, without causing Claude Shannon to spin in his grave. The last time was with Focus Magic, which uses de-convolution to extract (new) information about a pixel from its neighbors, thus improving image sharpness. |
That's not paradoxical, if we realize that the result is misfocus is just the application of a "spreading" function, which we may be able to reverse (at least partially) by the application of the inverse transform (in this case, done in the "discrete" domain).
Fifty years ago, we transmitted very high bandwidth video over ordinary telephone pairs directly (well beyond the supposed "bandwidth limit" of the pair medium), by applying an equalizer with a gigantic slope at its upper end. The loss of the cable at the higher frequencies in the video signal was not infinite, just very large.
This used to be how the video usually got from the baseball park to the TV studio.
So, as in the case you mention, "the information was there all along", it just needed (quite) a bit of a boost.
Best regards,
Doug
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