control point matching in image registration

which algorithm is used in matlab to match several selected control points in case of image registration?

Answer 1

[Image Analyst]

cpselect()

[Mahua Nandy(Pal)]

I know that cpselect is used for control point selection, but what is the underlying algorithm used ?

[Image Analyst]

I would guess just an affine transform, like from imtransform() or tformfwd().