Am Montag, 16. Oktober 2017 14:38:36 UTC+2 schrieb Iacovlev Pavel:
>
> My challenge:
>
> Can someone point me into the right direction to figure out how to 
> properly calculate/convert `focal_pixels` and the `k1, k2, k3, k4` 
> parameters ?
>
> k1 - Most likely corresponds to `c` pto value. In Hugin this parameter is 
> called: Radial distortion (c).
>
> k2 - Most likely corresponds to `a` pto value. In Hugin this parameter is 
> called: Radial distortion (a). 
>
> k3 - 
>
> k4 - 
>

This was already discussed. Short answer: this is not easily possible (and 
there is no 1:1 correspondence). see 
https://groups.google.com/d/msg/hugin-ptx/-r-yk8zI6Gs/p-1BP-ihBQAJ

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