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