Homographies
Perspective projection of a plane
•Lots of names for this:
–homography, texture-map, colineation, planar projective map
•Modeled as a 2D warp using homogeneous coordinates
H
p
p’ 
To apply a homography H
•Compute     p’ = Hp       (regular matrix multiply)
•Convert p’ from homogeneous to image coordinates
–divide by w (third) coordinate