Method and device for recognizing non-unrolled fingerprints
First Claim
1. Method for the identification of not-enrolled fingerprint images, wherein images are recorded of skin lines of at least two juxtaposed fingers (1, 2) of a hand, orientations of finger longitudinal axes (L1, L2) are determined, and a rotation (W1) of the fingers about their longitudinal axis is largely prevented by a guidance means (13), so that during each identification process clearly defined, almost identical partial fingerprint image quantities (B3, B4) of skin lines of the two juxtaposed fingers of whole, enrolled fingerprints are detected, therefrom digital grey value images are determined and transferred by evaluation algorithms into a digital biometric pattern with a reduced data quantity.
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Accused Products
Abstract
For the better identification of not-enrolled fingerprint images, images of skin lines of two juxtaposed fingers (1, 2) of a hand are recorded. The orientations of the finger longitudinal axes (L1, L2) with respect to the normal direction (N) are determined and by means of a guidance means (13) a rotation or twisting (W1) of the fingers about their longitudinal axis is largely avoided, so that virtually coinciding, defined partial image quantities (B3, B4) of the complete enrolled fingerprint (A) are detected and transferred by evaluation algorithms into a reduced data quantity. This allows a much greater identification reliability with a smaller storage requirement and simpler evaluation algorithms.
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Citations
19 Claims
- 1. Method for the identification of not-enrolled fingerprint images, wherein images are recorded of skin lines of at least two juxtaposed fingers (1, 2) of a hand, orientations of finger longitudinal axes (L1, L2) are determined, and a rotation (W1) of the fingers about their longitudinal axis is largely prevented by a guidance means (13), so that during each identification process clearly defined, almost identical partial fingerprint image quantities (B3, B4) of skin lines of the two juxtaposed fingers of whole, enrolled fingerprints are detected, therefrom digital grey value images are determined and transferred by evaluation algorithms into a digital biometric pattern with a reduced data quantity.
- 9. Apparatus for the identification of not-enrolled fingerprint images comprising an image recording device (10) for recording of skin lines of at least two juxtaposed fingers (1, 2) of a hand with a support plate (12) on which the two recording fingers (1, 2) are positioned in unturned manner relative to their longitudinal axes (L1, L2) by guidance means (13) and where orientations of finger longitudinal axes (L1, L2) are determined and an evaluating electronics (14) for determining digital grey value images, and with evaluation algorithms (15) for defining and evaluating features of the at least two digital fingerprint images and for reduction into a biometric pattern with a reduced data quantity and an associated data bank (19) with comparison patterns.
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17. Method for the identification of not-enrolled fingerprint images, wherein images are recorded of skin lines of at least two juxtaposed fingers (1,2) of a hand, orientations of finger longitudinal axes (L1, L2) are determined by establishing centroid lines of each fingerprint image and from said longitudinal axes are determined their orientation angles (α
- 1, α
2) and their aperture angle δ
=α
1−
α
2, and a rotation (W1) of the fingers about their longitudinal axis is largely prevented by a guidance means (13), so that during each identification process clearly defined, almost identical partial image quantities (B3, B4) of whole, enrolled fingerprints are detected therefrom digital grey value images are determined and transferred by evaluation algorithms into a digital biometric pattern with a reduced data quantity.
- 1, α
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18. Method for the identification of not-enrolled fingerprint images, wherein images are recorded of skin lines of at least two juxtaposed fingers (1,2) of a hand, orientations of finger longitudinal axes (L1, L2) are determined or will be determined and a rotation (W1) of the fingers about their longitudinal axis is largely prevented by a guidance means (13), so that during each identification process clearly defined, almost identical partial inage quantities (B3, B4) of whole, enrolled fingerprints are detected therefrom digital grey value images are determined and transferred by evaluation algorithms into a digital biometric pattern with a reduced data quantity, wherein restricted image section quantities (S, S3) are used for evaluating with evaluation algorithms (15).
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19. Method for the identification of not-enrolled fingerprint images, wherein images are recorded of skin lines of at least two juxtaposed fingers (1, 2) of a hand, orientations of finger longitudinal axes (L1, L2) are determined and a rotation (W1) of the fingers about their longitudinal axis is largely prevented by a guidance means (13), so that during each identification process clearly defined, almost identical partial fingerprint image quantities (B3, B4) of skin lines of the two juxtaposed lingers of whole, enrolled fingerprints are detected and transferred by evaluation algorithms into a digital biometric pattern with a reduced data quantity, said pattern including core positions (C1, C2) of the two juxtaposed fingers and a spacing (R) and a direction (β
- ) of the core positions.
Specification