[gdal-dev] 4 point, projective warping

[Jeffrey Warren]

Thanks for all the input, Manuel - I've gone ahead with the
ImageMagick system and it works pretty well. That said, a projective
warp would be great as a native GDAL feature, so thanks for the offer.

If anyone else has interest, please pipe up! If it's just me then I
guess there's not too much demand.

Jeff

On 7/30/10, Manuel Massing <m.massing at warped-space.de> wrote:
> Hi Jeffrey,
>
>> I've thought about implementing a projective transform in the qgis
>> georeferencer, so if you're interested I'll let you know when I get around
>> to it.
>
> If this interest you, I have just commited an initial implementation of
> projective warping (see https://trac.osgeo.org/qgis/changeset/13987)
> to the qgis georeferencer, which is based on the gdalwarper.
>
> In principle, it should be relatively easy to integrate this transform into
> a
> custom version of gdalwarp.
>
> Maybe there's even interest to have such a transform in GDAL proper?
> I would be willing to contribute the code to GDAL, although the model
> fitting step uses a singular value decomposition, so this would require
> some dependency on  a linear algebra package (I wouldn't consider it wise to
> reimplement numerical algorithms from scratch, with their numerous caveats).
>
> cheers,
>
> 	Manuel
> 	
>