[GRASS-user] rectifying digital images

[Vincent BAIN]

Merci !
I'll try it soon...


Le samedi 05 janvier 2008 à 14:21 +0100, Markus Neteler a écrit :
> On Jan 5, 2008 1:56 PM, Vincent BAIN <bain at toraval.fr> wrote:
> >
> > 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 ?
> 
> OK, I have added my draft recipe here:
> http://grass.gdf-hannover.de/wiki/Orthorectification_digital_camera
> 
> Feel free to improve the page.
> 
> Markus
>