Methods for capturing fingerprint images using a moving platen
First Claim
Patent Images
1. A method for acquiring fingerprint images, comprising the steps of:
- (a) providing an optical platen having a transparent scanning area movable along a scanning direction;
(b) selecting one of at least two available operating modes, said available operating modes including a roll print capture mode and a four finger flat print capture mode;
(c) placing at least one fingertip on said optical platen and moving said optical platen in said scanning direction under said fingertip;
(d) imaging said fingertip through a prism to collect a plurality of fingertip image portions; and
(e) assembling said plurality of fingertip image portions using an electronic processor to form a composite fingerprint image.
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Abstract
A method and apparatus whereby a fingerprint verifier has a mechanism to slide a prism over an imaged area of a camera. The position of the prism being determined by a binary absolute linear code on a sliding mechanism imaged by the same camera at the side of the fingerprint wherein the images are knitted together to simulate a large CCD.
190 Citations
21 Claims
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1. A method for acquiring fingerprint images, comprising the steps of:
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(a) providing an optical platen having a transparent scanning area movable along a scanning direction;
(b) selecting one of at least two available operating modes, said available operating modes including a roll print capture mode and a four finger flat print capture mode;
(c) placing at least one fingertip on said optical platen and moving said optical platen in said scanning direction under said fingertip;
(d) imaging said fingertip through a prism to collect a plurality of fingertip image portions; and
(e) assembling said plurality of fingertip image portions using an electronic processor to form a composite fingerprint image. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for acquiring roll print fingerprint images, comprising the steps of:
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(a) providing an optical platen having a transparent scanning area movable in a linear motion along a scanning direction;
(b) placing at least one finger having a fingertip on said optical platen and rotating said finger about a rotational axis along the length of the finger with said optical platen moving in said scanning direction under said finger;
(c) imaging said fingertip to collect a plurality of fingertip image portions during rotation of said finger; and
(d) assembling said plurality of fingertip image portions using an electronic processor to form a composite roll print image. - View Dependent Claims (9, 10, 11, 12, 13, 14)
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15. A method for acquiring flat print fingerprint images, comprising the steps of:
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(a) providing an optical platen having a transparent scanning area movable in a linear motion along a scanning direction;
(b) placing a plurality of fingers having fingertips on said optical platen and moving said fingers linearly with said optical platen moving in said scanning direction under said fingers;
(c) imaging said fingertips to collect a plurality of fingertip image portions during movement of said fingers; and
(d) assembling said plurality of fingertip image portions using an electronic processor to form composite flat print images of said plurality of fingers. - View Dependent Claims (16, 17, 18, 19, 20, 21)
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Specification