Hallöchen!

Bruno Postle writes:

> On 3 March 2014 10:25, Torsten Bronger <[email protected]> wrote:
>
>> How is the FOV lens parameter in Hugin defined?  Always the
>> horizontal axis, always the longer axis, always the shorter axis?
>
> Always horizontal, this is inherited from the panotools lens model.

Then, I'd like to define the FOV on the *shorter* axis for the
Lensfun project.  Lensfun needs a clearer definition than Hugin
because it doesn't have the image size but only crop factor and
aspect ratio >= 1.  By using the shorter axis, we can re-use the
scaling parameters calculated for the distortion coordinate system,
and needn't introduce yet another coordinate system.

However, Hugin must then re-calculate the FOV value returned by the
Lensfun database for the particular projection and image
orientation.  For the general case, it must do so anyway because
users may feed images in any orientation into Hugin.

I'm about to implement this in Lensfun today, but it is not much
code, and I can wait with it if someone on this list wants to talk
about it.

Tschö,
Torsten.

-- 
Torsten Bronger    Jabber ID: [email protected]
                                  or http://bronger-jmp.appspot.com

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