Hi Kay, I typically add as many CP as I can and after the first alignment I will delete those that are definitely bad. Usually, there will be many points with errors of several thousand pixels. You can usually see a distribution change between normal and outliers. After this, I will set the Nadir to a unique lens number and iteratively opimize everything and remove outliers. I will inspect a sample of the outliers to make sure they are really bad each time. In some situations, cloud movement will cause good points to have higher errors, so I am careful not to delete too many good points. I can usually get a defect free stitch with a 21mm lens using this technique, but I agree there are probably simpiler methods.
Regards, Rick On Dec 27, 7:48 pm, kfj <[email protected]> wrote: > On 27 Dez., 12:20, RueiKe <[email protected]> wrote: > > > > > The project did use a pano head, so all stacks will be aligned with > > the exception of the nadir, which may have some slight movement, so I > > add control points to align the Nadir and specify a different lens > > after the intial alignment. I am still using autopano-sift-c. Yes, I > > use a lot of control points then delete many during the processes of > > successive optimizations. I can usually acheive about 0.3 pixel mean > > error for a 16k wide pano. > > You may loose more than you gain by throwing out a great number of > CPs. Often the 'best' CPs are clustered in unproblematic areas, > particularly if you are using a fisheye and/or the lens isn't > perfectly calibrated. If you just throw out everything above a > threshold, you may end up with insufficient area coverage. Don't be > too keen on minimizing the mean error, it's not a measure for the > quality of your final panorama, just an indicator about the CPs. In my > experience it is useful to throw out only CPs which are obviously way > off or wrong (like, the worst 10%, or everything above 10). The > optimizer is a very clever thing and can well cope with outliers. > > 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 [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
