Thanks Thomas And to answer your private question publicly, yes, we will publish the results of our lens calibration tests.
But it may not be soon, as there is a lot of work to do, and we haven't yet even a clear idea of what form the results should take. Of course one way will be in terms of the "format, a, b, c" model that PT now uses; but that only allows two lens projections: rectilinear and equal-angle (spherical) fisheye. We are pretty sure that lens correction will work better if the equal-area fisheye type is added (indeed PTGui now uses that in place of the equal-angle); and there are a couple of new fisheyes that follow the stereographic curve, too. So we may try all three prototype fisheye functions, to see which gives the best fit (smallest a,b,c values). An even more ambitious goal is to fit the lens responses to an adjustable prototype that can match all 4 functions (yes, rectilinear and fisheye in one model) and anything in between; if successful, that should make the needed a,b,c very small indeed, which is how they must be for really stable optimization. If you, or anyone else, can suggest a good way of evaluating the "residual error" of a fitted lens projection, please let us know. Regards, Tom On Jul 28, 4:42 pm, Thomas Steiner <[email protected]> wrote: > > We need photos taken with as many different lenses as possible > > I uploaded some toftp://tksharpless.net/lenscal/thomas/ > Some info about the lenses is in this directory. > Let me know if you need/want more. All lenses are of course > demountable. Do you want the shots at differnt aperatures or just the > widest open or what? (I did them at f/8.0) > Thomas > > the textfile: > The Camera was always my Canon EOS 350D, the crop factor is something > like 1.6, but you see this in the exif data. > The following lenses were used: > * Canon EF 75-300mm 1:4-5.6 IS > * Canon EF 50mm 1.8 II > * Sigma 24-70mm F2.8 (not sure which one exactly - do you need this?) > > The zoom lenes I took with different focal lengths (3 steps), all are > taken with aperature f/8. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
