System and methods for transforming biometric image data to a consistent angle of inclination
First Claim
1. A method for spatially transforming biometric data for invariant feature extraction comprising the steps of:
- selecting a statistical relationship between pixels of a transformed biometric data image;
pixelating the biometric data to form a biometric image thereof, said image including a plurality of pixels at a corresponding plurality of pixel coordinates, said biometric data oriented in said image at a submission angle with respect to a predetermined axis of said image; and
applying a transform to said biometric image to form said transformed biometric image, said biometric data being thereby rotated to an angle of inclination corresponding to said statistical relationship regardless of said submission angle.
0 Assignments
0 Petitions
Accused Products
Abstract
Biometric data are obtained through a biometric input device (120) and subsequently pixelated via a pixelator (130). The pixelator (130) creates an image of the biometric data. Via a processing unit (110), a relationship between pixels of a transformed version of the image is asserted. Thus, the biometric data is rotated to a consistent inclination based on the relationship between pixels regardless of an orientation in which the biometric data were captured in the original image. Once the image has been transformed, features of the biometric data may be extracted and either stored in a data storage unit (140) or compared with previously stored feature values for validation of the biometric data.
-
Citations
20 Claims
-
1. A method for spatially transforming biometric data for invariant feature extraction comprising the steps of:
-
selecting a statistical relationship between pixels of a transformed biometric data image;
pixelating the biometric data to form a biometric image thereof, said image including a plurality of pixels at a corresponding plurality of pixel coordinates, said biometric data oriented in said image at a submission angle with respect to a predetermined axis of said image; and
applying a transform to said biometric image to form said transformed biometric image, said biometric data being thereby rotated to an angle of inclination corresponding to said statistical relationship regardless of said submission angle. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for verifying the validity of biometric data by invariant feature extraction, the method comprising the steps of:
-
selecting a statistical relationship between pixels of a transformed biometric data image;
providing an input device for obtaining biometric data from a user;
providing a storage unit for storing features of said biometric data;
receiving a first sample of said biometric data from said user;
pixelating said first sample to form a first sample image, said first sample image including a plurality of pixels at a corresponding plurality of pixel coordinates, said first sample being oriented in said first sample image at a first submission angle with respect to a predetermined axis of said first sample image;
applying a transform to said first sample image to produce a first transformed biometric data image, said first sample being oriented in said first transformed biometric data image at an angle of inclination corresponding to said statistical relationship;
extracting biometric features from said first transformed biometric image and storing said features in said storage unit;
receiving a second sample of said biometric data from said user;
pixelating said second sample to form a second sample image, said second sample image including a plurality of pixels at a corresponding plurality of pixel coordinates, said second sample being oriented in said second sample image at a second submission angle with respect to a predetermined axis of said second sample image;
applying said transform to said second sample image to produce a second transformed biometric data image, said second sample being oriented in said second transformed biometric data image at said angle of inclination;
extracting said biometric features from said second transformed biometric data image; and
comparing said biometric features of said second transformed biometric data image to corresponding ones of said features stored in said storage unit. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18)
-
-
19. A system for spatially transforming biometric data for invariant feature extraction, the system comprising:
-
an input device operable to obtain biometric data from a user;
a pixelator operable to pixelate said biometric data into an image thereof, said image including a plurality of pixels at a corresponding plurality of pixel coordinates, said biometric data oriented in said image at a submission angle with respect to a predetermined axis of said image;
a storage unit operable to store sequences of program instructions that, when executed by a processing unit, cause said processor to execute a transformation process for transforming said image into a transformed image such that said biometric data are rotated to an angle of inclination in said transformed image corresponding to a predetermined statistical relationship between pixels thereof regardless of said submission angle; and
a processing unit coupled to said input device and said storage unit, said processing unit operable to execute said transformation process. - View Dependent Claims (20)
-
Specification