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 -~----------~----~----~----~------~----~------~--~---
