A special case of the projective camera is the perspective
(or central) projection, reducing to the familiar pin-hole
camera when the leftmost
sub-matrix of
is a
rotation matrix with its third row scaled by the inverse focal
length
. The simplest form is:
which gives the familiar equations
Each point is scaled by its individual depth, and all projection
rays converge to the optic center.
Subhashis Banerjee
2008-01-20