[ptx] automatch: another attempt at semi-automatic panorama stitching

[Pablo d'Angelo]

On Sun, 04 Jan 2004, JD Smith wrote:

> On Sun, 2004-01-04 at 14:45, Pablo d'Angelo wrote:
> > Hmm, why don't use a spherical coordinate system? instead of 3d positions on
> > a sphere. sqrt(theta^2+phi^2) would then measure the angular distance, I think.
> 
> Actually, I think it's more like:
> 
> sin(angular_sep/2)=sqrt[sin((phi_1-phi_2)/2)^2+cos(phi_1)*cos(phi_2)*sin((theta_1-theta_2)/2)^2]

Thanks for the correction, I was just guessing.

ciao
  Pablo
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