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A linear projection used in APG is stretching the panorama image too much, especially on the sides.
Please look at the first panorama at the link below:
http://www.bigano.com/index.php/en/pano-shooting.html
I was not yet able to create panorama with the same look using APG and photographing from a single point. What is a "linear stitching technique" mentioned on that web page?
Would it be a scanner-like shooting, basically photographing perpendicular to the panorama (the camera is never rotated), moving along the panorama for every shot?
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dont think so. the example "3elle" pano is a 180" turn and no horizontal movements...
rather some sort of manipulation of final pano (photoshop, ptlens etc.)
have a look at these examples:
http://epaperpress.com/ptlens/example.html (menu examples...)
Georg
Last edited by gkaefer (2010-06-17 16:26:16)
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Michael Ezra wrote:
Would it be a scanner-like shooting, basically photographing perpendicular to the panorama (the camera is never rotated), moving along the panorama for every shot?
Its called orthographic stitching where you move the camera parallel to the scene, for stitching these in APG you have to alter exif to 1000mm lens & detection set to normal, it should work then.
Its the a tough job to do orthographic panos, requires lot of patience.
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Michael Ezra wrote:
What is a "linear stitching technique" mentioned on that web page?
Using different projection modes for different parts of the final result (for example for the 3elle pano rectilinear projection on the left side building and cylindrical projection for remaining part) is a probable answer.
Manual adjustment between the different parts is possible but more sophisticated solutions are on the way, as in http://vis.berkeley.edu/papers/perspect … _sig10.pdf...
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GURL wrote:
... more sophisticated solutions are on the way, as in http://vis.berkeley.edu/papers/perspect … _sig10.pdf...
This is fantastic! Is this software already available?
This is also very interesting:
Optimizing Content-Preserving Projections for Wide-Angle Images
http://vis.berkeley.edu/papers/capp/
http://vis.berkeley.edu/papers/capp/pro … -sig09.pdf
Correction of geometric perceptual distortions in pictures
http://graphics.stanford.edu/~dzorin/pe … index.html
Alexandre, you should find a way to add this to APG!
Last edited by Michael Ezra (2010-06-18 17:59:11)
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Such a feature is ready here is a separate software. We need to finish the packaging and you will be able to play with a prototype.
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Great news Alex, when do we get it?
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Alexandre, this is really great news! If you need some help with testing, I'd be glad to help.
I have many panos of new york city which would benefit from this type of perspective correction.
Would it not be ideal to have this built into APG at some point in the future, to avoid another pass of image interpolation which will result in softening and local artifacts?
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Alexandre, do you have any estimate when this software will be available?
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No estimation yet because we are concentrated on autopano engine 2.5 for the moment.
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Alexandre, please take a look at this: http://local.wasp.uwa.edu.au/~pbourke/geometry/distort/
(there is math and source code)
http://www.dxo.com/us/photo/dxo_optics_ … amorphosis
you may find it useful!
Last edited by Michael Ezra (2010-08-21 19:56:45)
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