Bruno, It cannot possibly be the case that I'm right and you're wrong. You know much more about this than I do. So please tell me where my understanding is wrong.
On Mon, Nov 21, 2011 at 10:59:46PM +0000, Bruno Postle wrote: > On Mon 21-Nov-2011 at 13:56 -0800, JohnPW wrote: > >Please clarify this for me as I want to make sure I understand (and it > >may be helpful to other newer Panorama makers like myself.) > >These are my assumptions: > > >1.) Only the actual horizon should be assigned as a "horizontal > >line" (unless you just want some line, or the average of some lines, > >to be straight and at the horizontal center (equator) of the panorama) > >because the horizon line is the only latitudinal line that lies upon a > >great circle line (the equator.) > > Yes, for spherical panoramas. Horizontal lines can also be useful > for removing perspective from façades of buildings, but only when > you are using rectilinear projection for the output. In that case, they should be called horizon-lines instead of horizontal lines. I thought that horizontal and vertical control points matter to the optimization step. Normally, I thought the control points are all transformed into the spherical coordinates, and for each pair both the longitude and lattitude are compared. In fact the distance is calculated and optimized. I thought that for a horizontal controlpoint pair, the lattitude simply doesn't count. So all that the optimization step cares about is the that they line up horizontally. Similarly for the vertical control lines. There the horizontal position, or longitude is not taken into account. I thought that all this was independent of the projection being used for the final result. Roger. -- ** r.e.wo...@bitwizard.nl ** http://www.BitWizard.nl/ ** +31-15-2600998 ** ** Delftechpark 26 2628 XH Delft, The Netherlands. KVK: 27239233 ** *-- BitWizard writes Linux device drivers for any device you may have! --* The plan was simple, like my brother-in-law Phil. But unlike Phil, this plan just might work. -- You received this message because you are subscribed to the Google Groups "Hugin and other free panoramic software" group. A list of frequently asked questions is available at: http://wiki.panotools.org/Hugin_FAQ To post to this group, send email to hugin-ptx@googlegroups.com To unsubscribe from this group, send email to hugin-ptx+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/hugin-ptx