I have implemented a script, pinbarrel, to apply or correct
pincushion and/or barrel distortion. This script was implemented
according the formula given by Dersch on his page at
http://www.all-in-one.ee/~dersch/barrel/barrel.html
Unfotunately, this had to be implemented using -fx. Therefore it is
rather slow.
I have made some improvements to the algorithm such that one can
apply the distortion/correction in either x or y direction or both
and can apply pincushion in one direction and barrel in the other
direction.
I changed the order of the coefficients to reverse the assignment of
a,b,c,d from Dersch, so that the most important coefficients are
first, ie. a then b then c, then d. In otherwords, the ones that are
not likely to be zero are first.
The script and examples can be found on my IM script page at
http://www.fmwconcepts.com/imagemagick/index.html
Fred
P.S. Anthony, this is implemented as an inverse transformation and I
should be able to generate the equations for the derivatives as well.
I will communicate with you later on this.
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