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Re: Registration: still looking (dis-similar images, local variation)
| Re: Registration: still looking (dis-similar images, local variation) [message #8531] |
Wed, 19 March 1997 00:00 |
Achim Hein
Messages: 42
Registered: February 1996
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Member |
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Mitchell R Grunes wrote:
>
> I am still looking for software or algorithms to do a good job of
> image registration (warping one of the images so equivalent features
> overlay each other) for those cases where the two images are not
> all that similar (different sensors or from much different points
> of view), and/or where there is a LOT of elevation-induced small
> scale local variation, due to different projection-to-ground or
> layover geometries.
> Any ideas?
We are working on an automatic registration module too. We have modules
for detecting layover and shadow areas, for converting slant range
heights, distances and amplitudes to ground geometry, for precision
phase unwrapping and last but least a precision processing algorithm.
The simplest registration (airplane geometry) works like this:
-evaluate range displacements
-design a linear function in Range
-get a constant azimuth value
-registrated pixel=rg_constant+range_linear*pixel_number
-look for a threshold i.e. 0.1 pixel
evaluate it iterativ range by range
>
> This has surely got to be one of the oldest problems in remote
> sensing, and good solutions MUST exist by now. I promise to
> post useful responses to the news groups.
But think of David Fannings post:
"Perhaps you should offer a monetary reward."
That's the point - or are there any precise SAR-algorithms for free?
Regards
Achim
--
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Dipl.-Ing. A. Hein
PB2 / ZESS - Uni-GH-Siegen
Paul-Bonatz Str. 9-11
57068 Siegen
Phone: 0271/740-3362
Fax: 0271/740-2336
Mail: Hein@nv.et-inf.uni-siegen.de
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