If you can find a scene with objects far away to place control points, you could use a normal head with a planning base to take the 360 cylindrical photo, this should reduce the effect of parallel on the stitch and optimisation.
It looked as if you had a few bad control points leading to misplaced images and the distorted output. Try manually placing them instead, a few per overlapping pair, just to get a reasonable alignment at first. Refine by adding more control points. On Monday, 4 April 2022 at 22:47:23 UTC+1 Fotis K wrote: > thanks dkloi! that's an interesting idea, thought I don't have a panohead > to do the experiment! > I'd assume since iphone 13 is a quite popular smartphone there would be > already information on this, but now that you mention it, I wonder if > there is some simple way for me to calculate the values for hfov/focal > length/distortion once and for all! > As for rectilinear, I indeed was referring to the output projection and > trully they are being grossly misplaced! > > On Tuesday, April 5, 2022 at 12:17:37 AM UTC+3 dkloi wrote: > >> Might be better to use a panohead to take a 360 cylindrical pano with >> lots of overlap, create many spread out control points, optimise, and then >> save the lens parameters. This will give an accurate horizontal field of >> view, (equivalent) focal length, and the distortion values. >> >> When you say, switching to rectilinear projection, you mean the output >> projection, not the lens mapping (should be a rectilinear lens anyway)? >> Looks like it's a problem with the field of view of the output causing the >> rectilinear projection to stretch the periphery. Some of your images are >> badly places causing this, it would seem. >> >> On Saturday, 2 April 2022 at 18:26:54 UTC+1 Fotis K wrote: >> >>> I've been using hugin to successfully stitch 100mpx mosaic >>> reconstructions of larger artworks using my mirrorless camera and a 50mm >>> lens but I can't seem to be able to use my iphone photos for it; On loading >>> the photos it auto-selects a 5.1mm focal length with a 5.098 multiplier - >>> switching to rectilinear projection messes it up even more. >>> >>> Does anybody know the actual values for the lens or what might be wrong? >>> >>> [image: Screenshot 2022-04-02 at 7.39.10 PM.png] >>> >>> >>> -- 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 hugin-ptx+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/hugin-ptx/9bef7365-b0d9-4d74-9149-778b91034ff6n%40googlegroups.com.
