Hi,
attached you'll find distortion parameters for the
GoPro Hero3+ Black Edition in 4:3 mode.
N.b I've found an additional attempt to do this on the
ImageMagick documentation site:
https://www.imagemagick.org/Usage/lens/#examples
The author chose a crop-factor of 5.62, by virtue of
GoPros sensor size beeing 1:2.3"
(c.f the sensor datasheet at
http://www.sony.net/Products/SC-HP/cx_news_archives/img/pdf/vol_70/imx117cqt.pdf
)
I am not entirely sure, what's the correct value to choose,
so I stuck to the crop-factor value of 5.42 shipped in
GoPros EXIF information.
Cheers,
Christian
<lensdatabase>
<lens>
<maker>GoPro</maker>
<model>Gopro Hero3+ black</model>
<mount>goProHero</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>
</lensdatabase>
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