Hallöchen! klaus.fo...@gmail.com writes:
> [...] > > In these old days I did detail that from the lens parameter set > abc only the br^3 term is useful. Non-zero parameters a and c > introduce singularities at r=0, something a real lens does not > have. Could you elaborate on this? Possibly by a link to the old discussion? While I don't want to assert that using even exponents makes sense, I've never read a valid argument against them. There may be one, I simply never read it. In particular, the assumption that the underlying physics yield an odd function is a) not justified to me so far and b) does not mean that approximating its positive branch may not contain even components. Again: It may be true that a and c are superfluous or even harmful. But I'm looking for proof of that. > My query then was to also introduce r^5 and r^7 parameters. FWIW, I once patched the Pano library to use the exponents 3, 5, and 7 for a, b, c. It did not help for the (albeit single) pano that I used for testing. This is not a proof, it was only discouragement for me to follow this path further. Tschö, Torsten. -- Torsten Bronger -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to hugin-ptx+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/87k1pl19ow.fsf%40wilson.bronger.org. For more options, visit https://groups.google.com/d/optout.
