Getting straight and smooth horizons in navcam panoramas |
Getting straight and smooth horizons in navcam panoramas |
Oct 4 2006, 02:55 PM
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#1
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
Hi all,
I first thought that the problem of uneven horizons in navcam stitches must have been discussed a lot previously but to my surprise the forum search in the Tech&Imagery-board with key-word "horizon" did not yield that much relevant results ... So far, for autostich one "solution" seems to be to try-and-error estimate the correct "greek" orientation parameters (phi,psi,..) However I would like to know if there is a better and more deterministic way. I also played with PTGui/hugin and manual control points on the horizon but this seemed even more cumbersome than getting the right orientation in autostitch. The other problem ar the "edges"/"bumps" along the horizon exactly at the transition zones between individual panorama frames ... Now I am not that an expert in the stitching part of the image processing (jut use Autostitch which does a sufficiently good job, except for the horizon-problem ) so the question goes to the real "stitching Gurus (->Nico, Tman and others ??) how to cope with the horizon :-) Any recommendation for other pano programs that do better with flattening the horizon ? One idea qould be to use some JPL Metadata about the actual rover orientation. I understand that Micheal's MMB program does something like this but was unable to exploit this horizon-information for deriving orientation parameters for external panorama programs. Also, does anyone know if there is already a specification of the lens geometry of the MER navcam available in the form to be usable for a panorama program like hugin etc. ? this would certainly also help to yield undistorted horizons ... Maybe this thread could serve as a collection of useful tips & hints specifically with respect to the "horizon problem" |
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Oct 4 2006, 03:22 PM
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#2
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Senior Member Group: Members Posts: 1619 Joined: 12-February 06 From: Bergerac - FR Member No.: 678 |
I just post a part of answer in "Cabo Verde" topic
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Oct 4 2006, 03:41 PM
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#3
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Member Group: Members Posts: 713 Joined: 30-March 05 Member No.: 223 |
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Oct 4 2006, 07:42 PM
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#4
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Senior Member Group: Moderator Posts: 3431 Joined: 11-August 04 From: USA Member No.: 98 |
Ant, Thank you very much for the hint with the panorama export feature ... Do you think it's also possible to directly use the MMB metadata about rover orientation for the phi,psi... settings ? (Micheal ?) I've given up on Autostitch, so I'm not pursuing that direction. Of course what tool you use is up to you, but Autostitch just doesn't allow enough control for my taste - that's why I added the PTGui/Hugin export to the pan export feature in MMB. In MMB 1.5, the exported mmb.pts file has the camera pointings from tracking via the MMB metadata. Sometimes, as Indian 3000 has discovered, the rover quaternion is not perfect, so some manual tweaking of the pan may be needed; usually no more than a couple of degrees, though. Actually now that Indian 3000 is spitting out pans left and right, I probably won't bother so much. |
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