Re: Photo Image out of focus

[brian whatcott <inet@INTELLISYS.NET>]

Ludwik (and possibly Jeff Weitz) may find the Beeb's R&D Report on
video signal sharpening useful.
 The second URL points to a description of the Lucy-Richardson
algorithm for sharpening images, offered by Mathworks.
It demonstrates an image, a blurred version, and a reprocessed sharpened
version of the blurry image.

<http://www.bbc.co.uk/rd/pubs/reports/1995-12.pdf>

<http://www.mathworks.com/access/helpdesk/help/toolbox/images/deblurr7.shtml>

Brian

At 21:57 6/19/01 -0400, you wrote:
> In my opinion the lost information can not be recovered
> objectively but a sharp image can be created subjectively.
>
> Consider two nearly identical photos of black squares on
> a white wall. The photo edges are not sharp. In one case
> this is due to wrong focusing in another it is due to real
> lack of sharpness (in the object). I would say that there is
> no way to say which of the two pictures is the photo of
> a sharp square.
>
> On the other hand, if I already know what should be in
> the picture, for example, the face of my teacher, then
> I can can recreate this face, perhaps using another photo.
> A defocused photo can still be very useful, especially to
> those who know what to expect, up to a limit.
> Ludwik Kowalski
>
> Jeff Weitz wrote:
>
> > A parent of one of my students sent me the following question:
> > At Lower School graduation, I took a great photo of a friend of
> > mine and his son. But it's somewhat out of focus. I want to
> > print it, but in focus. ....
brian whatcott <inet@intellisys.net>  Altus OK
                Eureka!