On 22 Dez., 04:16, Tom Sharpless <tksharpl...@gmail.com> wrote:
> Kay is right. There is no way software, just looking at an image, can > tell which way is up. That requires outside information, either from > a person, who can judge such things, or even better, from a sensor in > the camera. Maybe intelligent guesswork could get it right in a reasonable number of cases, though: - roll isn't excessive - pitch isn't either - there are vertical linear edges detectable in the image with these guesses assumed true (and specified as prerequisites for the method to work), try - any detectable linear edges roughly parallel to assumed vertical are candidates - if a good number of these candidates are near paralel or can be found to converge in a common point, they probably are vertical too The person who takes the photo doesn't just hold the camera out randomly, particularly if the intent is to later make it into a panorama, so the approach might work just like auto-levelling in hugin works well with it's statistical approach if the images are reasonable. Most photographers will make an effort to get their verticals right, so it would only be a matter of fine-tuning the result. If that fails or the prerequisites aren't met, it can still be done manually. 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 hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx
