Well, by "rotated 45 degrees" I just mean rotated by tilting the
camera. And why would it need a lot of code change? Maybe I'm
overlooking lots of problems here, but isn't it just a matter of
discarding the EXIF rotation (or applying a rotation to the image data
before exposing it to the Hugin core) and replacing it with a roll of
90 or 270 degrees upon loading the image (which would also happen when
loading images without EXIF information)? Of course the HFOV field
will then sometimes be a VFOV really, but the same is true when
holding the camera at a 45 degree roll: strictly the HFOV won't be
"horizontal" then.

On 16 jul, 13:38, Seb Perez-D <[email protected]> wrote:
> On Thu, Jul 16, 2009 at 13:18, Bart van Andel<[email protected]> wrote:
> > I've always wondered why this is necessary. I would rather have Hugin
> > treat them as the same lens (which it basically is), with the same
> > parameters. Everything should be the same, except the image is rolled
> > 90 degrees. Why isn't this implemented this way? Images rotated "just"
> > 45 degrees can share the same lens, whereas images rotated 90 degrees
> > cannot?
>
> I thought that Nicolas meant that the input images were rotated, not
> with the roll parameter in Hugin (I don't know how you can have an
> input image rotated 45ยบ). Images with different roll parameters can
> share the same lens (I do that all the time).
>
> As for the reason, if I were pressed to answer: Hugin calculates the
> horizontal field of view based on the width of the image. Whether the
> image is horizontal or vertical changes this width, and the code would
> need to change a lot for this to work.
>
> Cheers,
>
> Seb
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