[ptx] New hugin tutorial - Stitching flat scanned images

[Bruno Postle]

On Fri 01-Apr-2005 at 17:15 +0800, Sebastian Nowozin wrote:
> 
> > Actually autopano-sift found lots of control points, but many of
> > them were near the edge of the scan where the image was
> > distorted.

> This is most likely a result of having the "area filtration"
> enabled.  If the area filter is enabled, the area covered by the
> control points is maximized (actually, the area of the convex hull
> of all points is) while knocking off control points to the maximum
> number specified.
> 
> This is useful for most images, as a larger covered image region
> can lead to better optimization.

When stitching two flat scans the area needs to be maximised in a
similar way, ideally all the control points would be spread out
evenly in a line along the length of the final seam.

This applies to many photographic situations too - Where most people
would prefer a clean seam to a mathematically accurate stitch.

This could be a neat hugin feature, it could sift control points by
calculating distances to the nearest seam and delete ones that are
furthest away.

-- 
Bruno