From Thu, 10 Jan 2008 14:01:35 +0100 Pablo dAngelo <[EMAIL PROTECTED]> wrote:
> Actually, my suggestion would be to just ignore this issue, That's what I'm going to do so far :) But the approach with calibration focal distance deviation with distance-to-subject can be added later without invalidating any of the data previously collected. > Hmm, does the vignetting really change noticeably with > varying focus? I haven't made any analysis in that direction > yet. It does, and for example for my Pentax 18-55mm it is very noticeable. Perhaps that's due to mechanical vignetting, optical vignetting shouldn't change that much imho. > The Zhang algorithm, for example as implemented in Bouguet's > matlab toolbox or the CamChecker program are suitable for this, > and will likely provide higher quality estimates as a 360°deg > panorama. Zhang distortion model seems pretty simplistic to me... as far as I understand it was targeted at webcams (e.g. pinhole lenses). I haven't even included it in lensfun so far, but it's easy to add it as soon as somebody needs it. Besides, it does not evaluate chromatic aberrations and vignetting. Calibrating TCA should give a good increase in image sharpness towards the edges... and this would be pretty neat for panoramas, especially if you don't overlap the images too much. > > For vignetting we have PTLens anyway ;-) > PTLens is not open source and when I last looked, > PTLens only offered an interactive vignetting correction. Sorry, it's my error - I was meaning Hugin. In most of my experiments it computed vignetting parameters quite well. > Btw. how is progress on the ufraw integration? I've finished the draft UI and now I'm implementing a system where arbitrary filters can be inserted into the de-bayering chain. I'd say, 50% complete. -- Andrew
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