On 3 Apr., "Terry Duell" <[email protected]> wrote: > Applying the psf to the blurred still doesn't give back a result even > close to the sharp, so there are probably other things not right with what > I am doing. A bit more homework to do.
Hang on, I don't think convolving the blurred image with the PSF will recover the original - it will worsen the blur. You have to revert the process (forgive me if I'm stating the obvious and you're doing just that), I just can't think of what you have to do to the kernel to use it to revert the convolution (maths buffs please come to the rescue!). Of course that bit may be easier in the frequency domain. And I still believe those sharp discontinuities and minimum-to-maximum jumps in your source image may be part of the problem, never mind you can recover the source image precisely. > All the thorny issues involved with 'real' images > are looking like more than I can handle. You have my sympathy. I feel like I've been in precisely your position quite often when the maths is getting heavy. This is why I prefer the convolution in the 'time' domain (btw. where is time in a 2D matrix ;-) - after all, convolution is nothing than taking a few copies of the original image, multiplying them with a factor, shifting them a bit in various directions and adding them up. I always found it miracoulous how you could achieve similar stuff in the frequency domain, and I never really got my head round complex exponentials either when I tried to understand the FT on an 'intuitive' level, even though complex exponentials do precisely the same as sines and cosines, and much cleaner and faster... Dabbling with real-world images and running up against my mathematical limits always made me respect the maths that actually did work on those images much more - stuff like SIFT and SURF, gaussians and laplacians and what not... Kay -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/hugin-ptx
