On Sun, 03 Apr 2011 09:43:52 +1000, Benjamin Schnieders
<[email protected]> wrote:
It might be necessary to execute the process iteratively, that is, find
a "smooth" PSF for non-exactly aligned pictures, apply it, then
reiterate and reposition the control points/the image with respect to
the new level of detail added from the first iteration.
Especially in this case, moving objects or parallax will lead to
horrible outcomes. I think someone wrote before that it will be hard to
find a correct PSF for the whole image, because of lens errors and so
on. Maybe the algorithm can (for example) work on a wavelet
decomposition of the image: The lowest frequency layer is processed
first, the result is applied, the wavelet decomposition repeated, and
the next level is processed. One can then reduce the size of the samples
to be corrected, so that lens errors, misplaced control points, moving
objects etc will just have a local influence. You can take regions with
most control points, or best-fitting control points, calculate the PSF
for these, and interpolate PSFs for regions with few control points.
You are way ahead of me...I haven't even been able to get reasonable
results from exactly aligned test images!
I probably won't be able to take this any further than experiments with
contrived test images. All the thorny issues involved with 'real' images
are looking like more than I can handle.
Cheers,
--
Regards,
Terry Duell
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