Patent ID: 6904151

Claim:
A method for the robust determination and recovering from general affine transformations, or any other defined parametric class of geometrical transformations, applied to data Y wherein said data contains a set of points or structured pattern supposed to follow an underlying regular grid, comprising the steps of: (a) detecting these points in some domain; (b) representing the detected points by their Cartesian coordinates and possibly keeping also their values; (c) calculating the parametric or the projective transform matched with the defined geometry of the points resulting in the corresponding maxima, for the specified geometry of points, and exploiting the redundancy in points, to extract the needed significant features from these maxima; (d) estimating the parameters of the possibly applied transformation from the class of affine transformations, or any other defined class, using information from (b) and (c); (e) recovering of the applied transformation using the parameters estimated in (d); whereby said estimating of geometrical transformation assists in the recovering from global image alterations whereby said Y containing a hidden set of points can be visually undistinguishable from the original data X.