Hullo All, After a lot of experiments and reading many learned papers...much of which flew way overhead...I am becoming easy to convince that there may not be a general (and relatively easy to implement) solution to the problem posed. I have to say that there are still many aspects of the problem that I find inscrutable. A few things don't make sense to me. To recap, I can carefully align the full blurred and sharp test images (working with a test set of the trees/woods provided by JohnG), find the exact same pixel in each and extract a pair of sub-images (256x256), and then derive a PSF which can be used to generate an (almost) exact replication of the sharp from the blur. All the theory stuff works perfectly up to this point. If I then extract a larger (512x512) image from the aligned blur and apply the PSF to the 256x256 tiles making up this larger test image, the resulting derived 'sharp' is poor (more like dreadful!). Some of the stuff I have read about this implies that because real images are of the 3D world the varying depth of each pixel will mean that there isn't a constant PSF across the image and that additional (very inscrutable) stuff has to be done to arrive a reasonable correction. If this were true for the case I have been spending most of my time on, then the result recreating the 256x256 sharp image might be a bit of fluke, but that result can be reproduced for a few different 256x256 sub-images. What is more confusing is that if I take a 512x512 blurred image which includes the 256x256 image used to derive the PSF in one corner (maybe not exactly, but to within 1 or 2 pixels), applying the PSF to each 256x256 tile produces a rubbish result for each tile! Why is so (as Julius Sumner Miller would have growled)? Blowed if I know. Either the derived PSF can only be applied to the exact same image it was derived from; I am doing things incorrectly; something else, or all of the above!
Cheers, Terry -- 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
