Mailinglist: | PanoTools |

Sender: | JD Smith |

Date/Time: | Thu, 13 May 2004 10:30:49 -0700 |

Subject: | Re: {HTML} New tutorial - running the optimizer |

On Wed, 2004-05-12 at 23:36, John Houghton wrote: > Thanks for your comments. I deliberately did not go into details > about projections because this is generally covered in beginners' > tutorials already. I did consider that having a table listing their > straight line preservation characteristics might be helpful. I think > I will probably do that. Thanks for the interesting observation that > straight lines in rectilinear images are projections of great > circles. This is obvious when you realise that the lines correspond > to the intersection of two planes, but I had not thought of it in > those terms. Thanks for the comments. For the *real* scoop on these projections (and others) see Mathworld: Used by PanoTools: ================== Rectilinear Projection (aka Gnomonic, aka Gnomic, aka Tangent Plane): http://mathworld.wolfram.com/GnomonicProjection.html Cylindrical Projection (aka Cylindric): http://mathworld.wolfram.com/CylindricalProjection.html Equirectangular Projection (aka Rectangular, aka Plane Chart, aka "Unprojected", aka "PSphere" (by Helmut only?)): http://mathworld.wolfram.com/EquirectangularProjection.html Fisheye Projection (aka Azimuthal Equidistant Projection): http://mathworld.wolfram.com/AzimuthalEquidistantProjection.html Other interesting projections for Panoramas or source material: =============================================================== Fisheye "OP" Projection (aka Orthographic Projection): http://mathworld.wolfram.com/OrthographicProjection.html The general class of cylindrical equidistant projections (of which Equirectangular is one): http://mathworld.wolfram.com/CylindricalEquidistantProjection.html e.g. the Miller equidistant with phi_1=37.5 deg is said to offer the least distortion overall. The cylindrical Equal area projections: http://mathworld.wolfram.com/CylindricalEqual-AreaProjection.html of which the Lambert variations would be interesting for prints of full 360deg panos. I do have a bit of trouble understanding the projection names in the libpano code. Does anyone know what the difference between sphere_cp and sphere_tp is, and what "mirror" is? JD Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/PanoTools/ <*> To unsubscribe from this group, send an email to: #removed# <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/