Google| Subject | Re: Lenses and sharpening |
| From | Alfred Molon |
| Date | 09/13/2014 22:23 (09/13/2014 22:23) |
| Message-ID | <MPG.2e7ec63176d1d7d998cc0a@news.supernews.com> |
| Client | |
| Newsgroups | rec.photo.digital |
| Follows | Floyd L. Davidson |
| Followups | Floyd L. Davidson (1h & 23m) > Alfred Molon |
In article <87k35720r3.fld@barrow.com>, Floyd L. Davidson says...
Floyd L. DavidsonIf the softness is caused by a particular camera-lens combination, is there a way to determine this point spread function with for instance some calibration steps, and then apply the right sharpening/ deconvolution?
But probably the most useful would be Richardson-Lucy Deconvolutional sharpening. Using just standard default filters (Gaussian and perhaps exponantial) for the point spread function should work better than other sharpen tools, but it would also be possible to develop a very accurate point spread function for any given specific lens (think of the Hubble Telescope), and that would be very significantly better than other methods.
I'm even wondering if this point spread function could be determined from an image (without any previous camera/lens calibration), so that the image processing software can choose the right sharpening algorithm and parameters. -- Alfred Molon
Olympus E-series DSLRs and micro 4/3 forum at http://tech.groups.yahoo.com/group/MyOlympus/ http://myolympus.org/ photo sharing site
09/13/2014-
