Have you ever been forced to abandon a photo picture due to out of focus?
If it had a good focus, how nice that picture would be!... Now the software
shown below can revive such photo from trash with sharp focus! The method
used there is based on traditional convolution method which is commom among
usual sharpening methods. And I did some improvement on it. You can enjoy
it with your own picture in your desktop.
http://www.users.bigpond.com/tiddler/focuscorrector.htm