[GRASS-user] rectifying digital images

[Vincent BAIN]

Le samedi 05 janvier 2008 à 13:44 +0100, Markus Neteler a écrit :
> On Jan 5, 2008 1:35 PM, Markus Metz <markus_metz at gmx.de> wrote:
> ...
> > Anyway, digital cameras are apparently not supported in i.ortho.photo.
> 
> Why this? I did so, using a handheld digital camera:
> 
>   M. Neteler, D. Grasso, I. Michelazzi, L. Miori, S. Merler, and
>   C. Furlanello, 2005. An integrated toolbox for image registration, fusion
>   and classification. International Journal of Geoinformatics. Special Issue
>   on FOSS/GRASS 2004 & GIS-IDEAS 2004, 1(1), pp. 51-61, March 2005.
>   PDF: http://ojs.info.gscc.osaka-cu.ac.jp/IJG/index.php/IJG/article/view/103/42
> 
> > I heard of some tools that can add fiducial marks to digital photographs
> 
> You can use the photo corners and calculate things yourself using
> "jhead" or other tools.

You mean pointing corners of the image as four fiducials, then assigning
them the dimensions of the sensor, in a coordinate system centered on
the estimated principal point ? If you do that with i.ortho.photo what
value would you give to the focal length, the one provided by the exif ?

Vincent

> 
> Markus
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