On 20 Apr., 00:34, Rogier Wolff <[email protected]> wrote:
> Yes, I think this is useful. Every possibility to get away with an imperfect set of images is welcome indeed. Never mind the theory - at times you can use a spanner as a hammer and the result will be just as well. > The drawback of forcing ALL points to fit is that you force all > control points to be perfect: If there happens to be a rogue control > point in there, this will have a huge influence on the result. In a way, I have stopped looking at control points as individual entities. Instead I see them like a surface attribute with a low sampling rate compared to the pixels. Upping the cp coverage is simple - running cpfind or apsc with the right parameters (or woa :) will create hundreds or even thousands of cps, and just throwing away the worse half of them is easy enough, eliminating any rogue cps. > Also there might be "unfixable" parallax errors. One photo might have > much more between two images. This is the real issue. Morphing will do a great job on non- parallactic errors which have produced distortions which aren't covered by the the panotools optical model. Proper parallactic errors may in some cases be made invisible by morphing, but some of them just won't yield. There are other mechanisms to deal with them which try and identify coherent regions and shift and deform them to match in the result, and morphing just isn't powerful enough to do that sort of magic. > Consider > > 1 a b c d 2 > 3 e 4 > > The 1, 2, 3 and 4 are control points. 1-3 are a vertical line. 2-4 > too. And 1-a-b-c-d-2 are evenly spaced, as are 3-e-4 on a different > picture. I suppose this illustrates what I mean but I'm slow to get my head round it... > On the other hand, you seem to be getting pretty good results in > practise. I guess practise trumps theoretical drawbacks.. :-) Or, as they say, the proof is the pudding 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
