[OSM-dev] Geometry help
richard at systemeD.net
Wed Oct 17 10:07:56 BST 2007
I'm doing a bit of rectification work on the New Popular Edition
scans. The aim is to make them suitable for use as a Potlatch
background without the user having to compensate much for warps/folds
in the paper.
If I have a quadrilateral with corners
(not a perfect square, but x1 and x2<x3 and x4, y1 and y2<y3 and y4, etc.)
then what maths do I need to apply to warp it into a square?
I'm using the Perl Imager module (so much nicer than ImageMagick)
which has an programmable pixel remapping routine that works like this:
Any help greatly appreciated.
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