I can see if I can provide some data, esp. since I see that none of my lenses are covered :) My question is: how much is a “significant amount” of straight-line data? Does a picture of an average building suffice? A bookcase?
On Jul 27, 1:11 am, Tom Sharpless <[email protected]> wrote: > HI All > > Tim Nugent's summer of code project, to develop a program for > calibrating lenses by the straight line method, has almost reached the > point where lots of test data are needed. So as his mentor, I am > issuing a call for pictures to test it with. > > We need photos taken with as many different lenses as possible -- 50 > different lenses, 10 pictures from each lens, would be ideal, so > please dig deep. Pictures with a significant amount of straight-line > content are most important, but we need some without, too, as we have > to be sure the program correctly rejects those. > > By straight line content we mean images of things that are straight in > the real world. The image itself can be curved, indeed it is that > curvature that gives us the lens characteristics. It is OK if there > are some smoothly curved edges in the picture too, so long as true > straight edges are in the majority -- again, to test that the program > can recognize that they are really curved. > > We need to know the lens focal length and the camera crop factor, or > sensor dimensions, or pixels-per-inch (or per-mm). Many camera files > will have that information in EXIF, but it won't hurt to tell us those > things if you know; if not, tell us the make and model of lens and > camera. > > File format should be jpeg or tiff, not raw, and the file should be as > the camera wrote it, not processed in any way. We could use your > digitized film images, too, if you are enough of a tech wizard to come > up with the equivalent pixel spacing at the focal plane (what we > really need to know is the focal length in pixels). > > Please submit photos by emailing me a download link, or by uploading > them to my ftp site. I can't give you one-click links because the > Google forum software mangles email addresses to protect (somebody's) > privacy. But if you replace <at> in the following with @, they will > work. > > email: tksharpless<at>gmail.com > ftp: ftp://tksftp:TKSpwd1<at>tksharpless.net/lenscal > > Windows users, note that putting the ftp:// URL into the location box > at the top of a File Explorer window will give you a nice ftp > connection (or should I say "experience"?) with the familiar Explorer > interface. If you want to use a real old fashioned ftp client, the > host is tksharpless.net, the username is tksftp, the password is > TKSpwd1. > > We promise not to publish your photos or use them for any nefarious > purpose, but be aware that neither email nor that ftp site is > particularly secure against evildoers. So don't send us your > masterpieces -- they probably wouldn't be any good for lens > calibration anyhow :-). > > Thanks in advance, Tom --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
