With a current snapshot this happens as well. Occurs with portait images of 2920x4386 when going from 199 degrees to 200 degrees fov. I have spend a bit of time trying to hunt this bug down. Preliminary result:
1. During image remapping in saRemap.c, saRemap_new(...) x[i] in this line y[i] = CamLens_RofA( pd, CamLens_AofR( ps, x[i] ) ) becomes > Pi. 2. Therefore the calls to CamLens_RofA( pd, CamLens_AofR( ps, x[i] ) ) (itself calling a2r_ster which calculates tan(0.5 * x[i] ) returns a negative value for y[i]. 3. The negative value for y[i] makes the monoticity test of the following spline evaluation fail, making the whole saRemap_new return 0 and autopano-sift-c segfault when saRemap_inv tries to dereference the null pointer. Questions: A comment in CamLens.c indicates that A (or x[i] in the above) should be < Pi for stereographic projection. Does this make sense? How did we end up with it being greater? Why does this trigger at fov > 199 in portrait and >225 in landscape? Should we just remap all x > pi to x = pi to get rid of the problem? Sorry for the chaotic braindump above, I need to go to sleep now and need to write the stuff down, otherwise a start from scratch is needed when I'm looking at the problem again. Regards Felix -- You received this bug notification because you are a member of Hugin Bug Hunters, which is subscribed to Hugin. https://bugs.launchpad.net/bugs/679398 Title: autopano-sift-c crashes with very wide photos Status in Hugin - Panorama Tools GUI: Triaged Bug description: With autopano-sift-C 2.5.1 An 8mm fisheye on a full size sensor produces a landscape orientation photo with an angle of view of 260 degrees, calling apsc like this results in no features identified and a segfault: autopano-sift-c --projection 2,260 output.pto *.JPG The transition is sudden: 223, 224, 225 degrees are fine and hundreds of features are detected. 226 degrees and above and 0 features are detected and matching produces a segfault. _______________________________________________ Mailing list: https://launchpad.net/~hugin-bug-hunters Post to : [email protected] Unsubscribe : https://launchpad.net/~hugin-bug-hunters More help : https://help.launchpad.net/ListHelp
