Re: Image Newbie Question

Wow, thanks everyone, I had no idea
it was so difficult.

Yes, I have the original B&W print
and it was I that scanned it
into a JPEG.

If it is OK to post a binary in
this newsgroup I will post it
tommorow.

Should I UUencode it
and then just paste in here
as text??

Thanks
M.



Martin Brown wrote:
> Musashi wrote:
>
> > I have a JPG of some books in a bookcase
> > (from a b&w picture taken in the 50's)
> > and I'd like to be able to recover the
> > names on the books.
>
> I hope you have the original print. If you cannot read them on there
> with an eye glass then there isn't a lot of hope for the JPEG.
>
> > When I zoom in on the jpg, the letters are too blurred
> > to read.
> >
> > Could someone point me to the correct image
> > processing algorithm to try and recover the
> > titles on the books in this jpg.
> >
> > Would it be some sort of low pass filter.
>
> Almost the opposite. The closest consumer software to doing what you
> want is an unsharp mask high pass filter. But it will amplify all the
> JPEG artefacts as well probably rendering it completely illegible.
>
> The only remote chance you have of getting some resolution back is if
> the image has very good signal to noise and is already within a factor
> of 3 of being legible. Then maximum entropy deconvolution might help if
> you can set the problem up exactly right from JPEG coefficient space.
>
> > I am a software person, so once the
> > correct algorithm is suggested,
> > I can implement it.
>
> Post the image and it may be possible to say whether there is anything
> that can be done with it. I hope you have original high resolution scan
> data rather than a JPEG - but even then you cannot expect miracles.
>
> Deconvolving blurred images is a notoriously ill-posed problem. Even
> using published algorithms it will take you a very long time to get a
> working code that makes a passable job of it on real data.
>
> Google "regularised deconvolution" and/or "maximum entropy"
>
> Regards,
> Martin Brown

.

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