[ptx] hugin woes (help please!)

[Lonni J Friedman]

On 12/30/05, Bruno Postle <bruno at postle.net> wrote:
> On Fri 30-Dec-2005 at 14:05 -0800, Lonni J Friedman wrote:
> >
> > I just got back from a trip where I took alot of pictures of
> > landscapes, and I'd like to stitch some of the pictures together
> > to get the true landscape effect.  hugin works great if I attempt
> > to stitch any two pictures together.
> >
> > However, if I try to stitch more than two pictures at a time (3 or
> > more, and ideally between 6 and 9) I run into two problems:
>
> > 1) if I set te panorama projection as 'rectilnear' as soon as i
> > click 'Stitch' I get a popup error:
>
> 'Rectilinear' is a projection onto a plane, so it has a theoretical
> maximum 'field of view' angle of 180 degrees.  Though in practice,
> 150 degrees is about as wide as you can go.
>
> This means that 'rectilinear' isn't a suitable format for immersive
> panoramas, you need to use 'cylindrical' or 'equirectangular'.
>
> > 2) If I go with 'equirectangular' instead, then I end up with a
> > badly deformed image that looks like this:
> > http://netllama.linux-sxs.org/new0.jpg
>
> This looks to me like the field of view of the source photos is
> overestimated, perhaps by as much as 50%.  Hugin tries to calculate
> the field of view based on camera metadata, but doesn't always get
> it right.
>
> Try optimising "positions and view (y,p,r,v)" or even "positions
> view and barrel (y,p,r,v,b)".  The default is "positions" only and
> assumes that the lens parameters are already correct.

Thank you so much.  This was exactly what I needed to know, and I was
able to create several gorgeous panoramas with hugin:
http://netllama.linux-sxs.org/pix/landscapes/