Am Mittwoch, 25. Juli 2018 23:09:40 UTC+2 schrieb Erik Krause: > > ... > The parallax is clearly visible. See the roof of the house move against > the background: http://erik-krause.de/parallax-foehl.gif >
Indeed. And I see that the shadow has moved as well. I have already looked into the 5 images of https://www.myairbridge.com/en/#!/link/DNe8WRQgF that should not suffer from parallax errors. Hugin tells me it is 171 degrees hfov, so no constraint by a full 360 degrees ring of images. And because the JPGs suffer from filtering and sharpening which could cause CP position jitter, I started from DNG using dcraw. Images are less sharp and suffer from colour noise. No CPs in the images top half where there is blue sky. Hence image misalignment in this top half would not be noticed. Using hugin CPfind, then fine-tuning all point and keeping only points with quality >= .80; also adding a few CPs manually near the horizon. Lens type full frame fisheye. Using v(hfov) and b only, alignment is awful. No improvement when adding d and e. Adding parameters a and c into the fit improves things drastically. Now I remove 5 CP outliers from the ~200 CPs. Looking at the vis images they look quite fine. But the situation is more benign here, in that the images have 60-70 percent overlap. Looking at the CP distances I find that they are smaller for adjacent images than non-adjacent images. This I think is some hint that the lens parametrisation is not yet optimum. Then I removed every other image from the project. On re-aligning I find that the d and e parameter values do change. Not much but noticeably. i ponder to think that e value of about 30 hints to some possible improvement which is possible because CPs are unevenly distributed in y. Looking at alignment in corners one sees some images moving by several pixels. Visible in the vis files, visible in the preview window. One also sees misalignments for horizontal features in the vis files. My conclusion for now, as a workaround, take image series with sizeable overlap. At least 50%, better something like 60% to 70%. Best regards Klaus -- A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ --- You received this message because you are subscribed to the Google Groups "hugin and other free panoramic software" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/df9f8538-cbc5-4e54-b20e-55385b9911f7%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
