GoPro Lens Correction Parameters Using Imagemagick

<lens>

   <maker>GoPro</maker>
   <model>GoPro Hero3+ black & compatibles</model>
   <model lang="en">fixed lens</model>
   <model lang="de">festes Objektiv</model>
   <mount>goProHero3+</mount>
   <cropfactor>5.42</cropfactor>
   <aspect-ratio>4:3</aspect-ratio>
   <calibration>
       <distortion model="ptlens" focal="15" a="0.01049" b="0.01663" c="-0.40901"/>
   </calibration>

</lens>

 magick .\gopro-image.jpg -distort barrel "0.01049 0.01663 -0.40901" out.png

GoPro 3 Black parameters:

 magick GoPro.JPG -distort barrel "0.06335 -0.18432 0.13009" out2.png

 magick GoPro.JPG -distort barrel "0.010 -0.32 0" out.png

De-barrel distortion information:

https://im.snibgo.com/debarrel.htm

Parameters for various action cameras:

https://github.com/lensfun/lensfun/blob/master/data/db/actioncams.xml#L132