The whole question of lens sharpness...

Started Jun 12, 2013 | Discussions thread
olliess
Contributing MemberPosts: 879
Like?
Re: The whole question of lens sharpness...
In reply to Alphoid, Jun 20, 2013

Alphoid wrote:

sjgcit wrote:

This isn't true. You can never fully reverse the many optical effects. You'd be breaking a number of well established physical laws if you could.

Please name one such law.

The law of entropy comes to mind.

Even if you attempted this to the limits of physics you'd probably be frustrated by sample variations in the lenses.

True. This is the difference between theory and practice. In theory, given a perfect model of the lens, I can completely undo any blur caused by the lens (although increase high-frequency noise in the process -- which matters a lot at ISO1600, but not so much at ISO100).

I am genuinely curious, what theory guarantees that you can determine a unique inverse for a diffusion-type process with noise?

Reply   Reply with quote   Complain
Post (hide subjects)Posted by
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
(unknown member)
Keyboard shortcuts:
FForum PPrevious NNext WNext unread UUpvote SSubscribe RReply QQuote BBookmark post MMy threads
Color scheme? Blue / Yellow