[GRASSLIST:9559] Re: rectifying images

[Michael Barton]

Markus,

How timely. We are just about to get a large batch of aerials that we need
to rectify. I'd be happy to beta test :-)

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: Markus Neteler <neteler at itc.it>
> Date: Fri, 16 Dec 2005 21:11:16 +0100
> To: Wolfgang Zillig <wolfgang.zillig at web.de>
> Cc: grasslist-en <GRASSLIST at baylor.edu>
> Subject: [GRASSLIST:9548] Re: rectifying images
> 
> hi,
> 
> a student of us has implemented improved versions of
> i.points and i.rectify based on previous work as published
> in our last year's Bangkok paper.
> 
> The new version
> - use FFT correlation to automatically search for ground
>   control points in a user given window pair (so, just zoom
>   more or less the same zone in the master and the slave
>   image)
> - do this for the entire stripe of images
> - bad GCPs are identified and eliminated
> - run the modified i.rectify to rectify the entire stripe.
> 
> We are using this to geocode historical images. I still
> have to cleanup the code to the current coding standards,
> then I need a beta tester :-)
> 
> If course you can also work with just 2 overlapping images
> and enjoy the automated GCP search.
> 
> Interested?
> 
> Markus
> 
> On Fri, Dec 16, 2005 at 03:13:03PM +0100, Wolfgang Zillig wrote:
>> I'm not sure if this helps for my problem (perhaps I was not clear
>> enough in my description). The problem is, that I have one original
>> images which I want to use as reference and all others are more or less
>> deformed but no one at the same level. So I think I will have mark my
>> reference points in all deformed images. When I understand right
>> grouping is good, when you have many images whith the same deformation,
>> or am I wrong?
>> 
>> Wolfgang
>> 
>> Hamish schrieb:
>> 
>>>> I need to rectify several images in the next time. Is there a way to
>>>> automatize this procedure a little bit? I have the "original" image and
>>>> then about 10 to 20 images which needs to be corrected that they refer
>>>> to the original one. I thought of something like saving the correction
>>>> points of the original image to an file, so that I don't need to mark
>>>> again (the reference points will be the same for all images) and I only
>>>> need to specify them in the images which needs to be rectified.
>>>>   
>>>> 
>>> 
>>> 
>>> Add all the images to a group, then rectify the lot.
>>> 
>>> i.group input=name[,name,...]
>>> 
>>> i.rectify -a
>>> 
>>> 
>>> 
>>> Hamish
>>> 
>>> 
>>> 
>>> 
>> 
> 
> -- 
> Markus Neteler     <neteler itc it>       http://mpa.itc.it
> ITC-irst -  Centro per la Ricerca Scientifica e Tecnologica
> MPBA - Predictive Models for Biol. & Environ. Data Analysis
> Via Sommarive, 18        -       38050 Povo (Trento), Italy