Hi Pierre, I would first check that both the pitch and yaw of all your input photos is set to zero and that the output projection is set to rectilinear (not equirectangular).
Some scanners can produce quite strong 'shear' distortion, like a parallelogram, if the head is not exactly perpendicular to the tracks. Panotools/Hugin has g & t lens optimisation parameters that will correct this. You only need one or the other depending if your shear is horizontal or vertical. I *think* g & t optimisation is hidden under a Hugin 'expert user' setting, I'm not at a computer at the moment so can't verify. -- Bruno On Fri, 5 Aug 2022, 19:42 Pierre Pierre, wrote: > Hi all, > > First, some background, I'm currently trying to digitize all my father's > paintings and drawings; For artworks somewhat larger than my scanner I > needed stitching, and have been using hugin for that purpose for a few > months now. > Using a script heavily inspired by the one referenced in the "stiching > scanned image" tutorial, or the script from Matthew Petroff ( > https://github.com/mpetroff/stitch-scanned-images) usually gives good > results. > The main issue I'm often facing is that the output image has some kind of > trapezoidal distortion, from mild to pronounced: usually the left end is > taller than the right end. > I don't know why this happens, images overlap correctly and I can stitch > the same images manually without too much effort (it's just a lot slower). > My current hypothesis is that output uses a rectilinear projection, but > I'd need a projection that's both rectilinear and conformal. I there a way > to request such optimization, or to postprocess control points mapping to > convert it to a conformal mapping? > Thank you for your attention, > > -- 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/CAJV99Zhn2iQNZ3wx-A0evZLpkqOirEwuB%3D_QTX%3DanVrYxnKDWQ%40mail.gmail.com.
