[ptx] autopano: first attempt at semi-automatic panorama stitching

[Pablo d'Angelo]

On Sun, 28 Dec 2003, Ed Wildgoose wrote:

> Perhaps this last step could make use of the hugin registration point 
> optimiser.  This seems to be pretty robust on the images I tried it on, 
> despite small changes in rotation (what are you using anyway?  Just 
> standard image correlation?).  So do something like this:

its a simple normalized cross correlation. Probably I should add subpixel
estimation sometime :)

ciao
  Pablo
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