PanoTools:
Re: {HTML} New tutorial - running the optimizer
JD Smith 2004-May-13 19:30:49
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
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