[Hdri] correction for barrel distortion

[Martin Moeck]

Assume you have a barrel distortion image like the one shown at
 
http://www.dcresource.com/reviews/nikon/coolpix5400-review/
 
towards the bottom of the page. 
 
1) Are there software tools or algorithms available to correct these images before they are converted into an HDR image?
 
2) If not, is there a simple way to correct the HDR image for barrel distortion?
 
Martin Moeck
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