Lower-Dimensional Subspace
•
(
a
4
,b
4
) =
affine invariant coordinates of
point 4 relative to first three.
•
Represent image: (
a
4
,b
4,
a
5
,b
5,
…
a
n
,b
n
)
–
This representation is complete.
–
The
a
or
b
coordinates of all images of an
object occupy a 1D linear subspace.