Homographies of points and lines
Computed by 3x3 matrix multiplication
•To
transform a point: p’ = Hp
•To
transform a line: lp=0 ® l’p’=0
–0 = lp = lH-1Hp
= lH-1p’ Þ l’ =
lH-1
–lines are transformed
by postmultiplication of H-1