[magick-users] RE: Barrel / pincushion distortion

[Fred Weinhaus]

Hello Wolfgang,

Your link

http://www.all-in-one.ee/~dersch/barrel/barrel.html.

redirects to http://360pano.eu/

and there is no sign of Helmut Dersch's work there that I can find. 
But he is well-known for his panorama work and camera distortion 
correction.

I think the correct link is

http://www.all-in-one.ee/~dersch/barrel/barrel.html

(without the ending period)

Fred




>Hello again,
>
>digging somewhat deeper, I have just fond out that there is a portation
>of PTlens to Linux called clens. The SourceForge project in which is is
>contained is called "Panorama Tools" and can be found at
>http://panotools.sourceforge.net. The source code of clens is GPL and
>can be found at http://sourceforge.net/project/showfiles.php?group_id=96188.
>
>Looking at the code, one gets a quite precise idea how PTlens performs
>its excellent barrel / pincussion correction. The code makes the PTlens
>database available so that you can readily look up the correction
>factors for certain camera models.
>
>Helmut Dersch's original thoughts on the subject (that seem to have laid
>the basis for PTlens) can be found at
>http://www.all-in-one.ee/~dersch/barrel/barrel.html.
>
>It seems like quite a lot of work is already done...
>
>Greetings from Germany
>Wolfgang Hugemann