[GRASS-user] help on imge registration

[Markus Neteler]

Luigi Calori wrote:
> 
> Now the questions:
> 
> 1) are i.rectify and i.point able to handle homographies?
> 

No, they don't.


Luigi Calori wrote:
> 
> I' ve found a nice reference paper on 
> http://gisws.media.osaka-cu.ac.jp/grass04/viewpaper.php?id=37
> but I did not fund anything in grass62 neither browsing thru CVS.
> Are these modules needed to handle homographies transforms ?
> 

Yes. They have been integrated into i.points.auto:
http://grass.gdf-hannover.de/wiki/Image_processing
-> download link

Note that the code needs an update to GRASS 6 (most is
based on 2 master theses at ITC-irst).


Luigi Calori wrote:
> 
> 2) there are also other modules like photo.camera photo.2image 
> photo.2target photo.rectify  I did not used them because they reqired 
> camera parameters I do not have.
> Are they able to handle homographies?
> 

No, they handle central projection (as needed for ortho-rectification
of aerial images).

Best
Markus
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