Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
65 words
A method for locating a target image in an image plane comprising the steps of: providing a target having a particular symmetry such that the target is invariant under a particular symmetry transformation; projecting the target onto the image plane to define a target image; performing a correlation operation between the target image and a version thereof that has been subjected to the symmetry transformation.
Claim 2
Independent Claim
65 words
A method for locating a target image in an image plane comprising the steps of: providing a target having a particular symmetry such that the target is invariant under a particular symmetry transformation; projecting the target onto the image plane to define a target image; performing a correlation operation between the target image and a version thereof that has been subjected to the symmetry transformation.
Claim 3
Dependent Claim
45 words
The method of claim 1, and further comprising the step, carried out before said step of performing a correlation operation, of filtering the target image to remove at least some higher spatial frequencies while leaving at least some lower spatial frequencies in the target image.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein said filtering step includes as well high pass filtering;
Claim 5
Dependent Claim
22 words
The method of claim 3 wherein said filtering step comprises applying a Laplacian operator and a Gaussian convolution to the target image.
Claim 6
Dependent Claim
25 words
The method of claim 4 wherein said correlation operation is carried out on images having binary values corresponding to the sign of the convolution values.
Claim 7
Dependent Claim
19 words
The method of claim 1 wherein the particular symmetry is a symmetry about a symmetry point on the target.
Claim 8
Dependent Claim
12 words
The method of claim 6 wherein the symmetry is point reflection symmetry.
Claim 9
Dependent Claim
17 words
The method of claim 1 wherein the target comprises a random dot pattern having the particular symmetry.
Claim 10
Independent Claim
95 words
A method for locating a target image in an image plane comprising the steps of: providing a random dot pattern having a point reflection symmetry through a symmetry point on the target; projecting the target unto the image plane to define a target image having an image symmetry point; subjecting the target image to a binarized Laplacian of Gaussian convolution to provide a filtered target image; and correlating the filtered target image and a point reflected version thereof to determine a point of maximum correlation, which corresponds to the location of the image symmetry point.
Claim 11
Independent Claim
95 words
A method for locating a target image in an image plane comprising the steps of: providing a random dot pattern having a point reflection symmetry through a symmetry point on the target; projecting the target unto the image plane to define a target image having an image symmetry point; subjecting the target image to a binarized Laplacian of Gaussian convolution to provide a filtered target image; and correlating the filtered target image and a point reflected version thereof to determine a point of maximum correlation, which corresponds to the location of the image symmetry point.