On Sun, 23 Nov 2025, 20:17 Robert Grübler wrote: > Hi Bruno, thank you very much for looking at my data. > > I would try deleting control points that are not near the likely seam > position. This seems counter intuitive, but these pixels will not end up in > your final image. > > That sounds logical to me, even if I don't understand your reasoning. In > my words, I would have said that it's because the fish-eye distortion is > extreme at the edges, making reprojection very unreliable. Or am I missing > something? > Yes in part. Because your photos overlap, the extreme edges of the circle are not going to be used, so putting control points here isn't going to help and may make things worse.
> ... or create lots of vertical control points to properly calibrate the > lens distortion (I would create the vertical points). > > Should the vertical control points only be located in the overlap area or > also outside it? > They should be all over the scene, especially in areas that are not overlapped. > I would also delete any close control points, ie. The floor might look > like a great calibration source, but using it will amplify any parallax > problems caused by the slight offset between lenses. > > Good point, thank youu > > Also, these circular fisheye images are very unlikely to be central in > the frame, so you need to optimise d & e parameters separately for each > side. > > What do you mean by "separately for each side"? > This is advanced usage, only do this if you can't get good results. I assume you are cropping out each circle and saving them as separate files. Even if you crop carefully these are different lenses, so they will be aligned differently relative to the sensors. The d & e parameters tell Hugin where the centre of the lens is relative to the centre of the sensor. So this technique involves you optimising each of the two circles as a different lens altogether. (Note there is a further more advanced technique where you feed the image with two circles into the hugin project twice, this way you can do all the cropping in Hugin and use the file directly out of the camera, but this can be tricky to set up) -- Bruno -- 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 visit https://groups.google.com/d/msgid/hugin-ptx/CAJV99Zj7hSmWscdFWM5gdQhKCxasL7CsOyUL06FPdNmXO6i-Rw%40mail.gmail.com.
