Fingerprint scanner auto-capture system and method
First Claim
1. A method of capturing an acceptable fingerprint image comprising the steps of:
- (a) capturing with a scanner an initial fingerprint image at a nominal image integration time;
(b) capturing with the scanner a first intermediate fingerprint image at a first intermediate image integration time;
(c) performing with a processor an image darkness test on the first intermediate fingerprint image to determine if the first intermediate fingerprint image results in an acceptable image darkness level;
(d) performing with the processor an image definition test on the first intermediate fingerprint image to determine if the first intermediate fingerprint image results in an acceptable image definition level; and
(e) determining with the processor that the first intermediate fingerprint image is acceptable if the image darkness test results in an acceptable image darkness level and if the image definition test results in an acceptable image definition level.
5 Assignments
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Accused Products
Abstract
A system and method of capturing an acceptable fingerprint image is disclosed herein. The method includes a step of capturing an initial fingerprint image at a nominal image integration time. Once this initial fingerprint image is captured, a first intermediate fingerprint image at a first intermediate image integration time is captured. Next, an image darkness test is performed followed by an image definition test. If one or more of these tests indicates that the first intermediate fingerprint image is unacceptable, a subsequent intermediate fingerprint image at a subsequent intermediate image integration time is captured. This subsequent intermediate fingerprint image can be captured before the image definition test is performed. Additional intermediate fingerprint images can be captured until an image that has an acceptable darkness level as a well as an acceptable definition level is captured. Also disclosed is a fingerprint scanner that performs this method.
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Citations
26 Claims
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1. A method of capturing an acceptable fingerprint image comprising the steps of:
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(a) capturing with a scanner an initial fingerprint image at a nominal image integration time; (b) capturing with the scanner a first intermediate fingerprint image at a first intermediate image integration time; (c) performing with a processor an image darkness test on the first intermediate fingerprint image to determine if the first intermediate fingerprint image results in an acceptable image darkness level; (d) performing with the processor an image definition test on the first intermediate fingerprint image to determine if the first intermediate fingerprint image results in an acceptable image definition level; and (e) determining with the processor that the first intermediate fingerprint image is acceptable if the image darkness test results in an acceptable image darkness level and if the image definition test results in an acceptable image definition level.
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2. A method of capturing an acceptable biometric image comprising the steps of:
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(a) automatically capturing with a scanner an initial biometric image at a nominal image integration time; (b) automatically capturing with the scanner a first intermediate biometric image at a first intermediate image integration time; (c) performing with a processor an image darkness test on the first intermediate biometric image to determine if the first intermediate biometric image results in an acceptable image darkness level; (d) performing with the processor an image definition test on the first intermediate biometric image to determine if the first intermediate biometric image results in an acceptable image definition level; and (e) determining with the processor that the first intermediate biometric image is acceptable if the image darkness test results in an acceptable image darkness level and if the image definition test results in an acceptable image definition level. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A biometric scanner for capturing an acceptable image, comprising:
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a camera configured to automatically capture an initial biometric image at a nominal image integration time and a first intermediate biometric image at a first intermediate image integration time; and a processor configured to; perform an image darkness test on the first intermediate biometric image to determine if the first intermediate biometric image results in an acceptable image darkness level; perform an image definition test on the first intermediate biometric image to determine if the first intermediate biometric image results in an acceptable image definition level; and determine that the first intermediate biometric image is acceptable if the image darkness test results in an acceptable image darkness level and if the image definition test results in an acceptable image definition level. - View Dependent Claims (16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A system controller for use in a biometric scanner,
wherein said system controller performs an image darkness test on a biometric image to determine if the biometric image results in an acceptable image darkness level, and wherein said system controller performs an image definition test on a biometric image to determine if the biometric image results in an acceptable image definition level.
Specification