Dynamic thresholding for a fingerprint matching system
First Claim
1. A method for use in print matching apparatus comprising the steps of:
- enrolling a print of a user;
extracting a set of matching features from the enrolled print;
comparing the extracted features of the enrolled print to extracted features of each print in a set of reference prints, wherein each reference print in the set is from a person other than the user, and determining a highest non-matching score;
determining at least two minimum and maximum matched score threshold pairs based on characteristics of the print matching apparatus; and
storing the matching features of the enrolled print, the highest non-matching score, and the at least two maximum and minimum matched score threshold pairs for use in verifying a subsequently captured print of the user, wherein the highest non-matching score and a selected one of the minimum and maximum matched score threshold pairs are used in determining a verification threshold used in verifying the subsequently captured print of the user.
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Abstract
A method for use in print matching apparatus that includes the steps of: enrolling (200) a print of a user; extracting (210) a set of matching features from the enrolled print; comparing (220) the extracted features of the enrolled print to extracted features of each print in a set of reference prints, wherein each reference print in the set is from a person other than the user, and determining a highest non-matching score; determining (230) at least two minimum and maximum threshold pairs based on characteristics of the print matching apparatus; and storing (240) the matching features of the enrolled print, the highest non-matching score, and the at least two maximum and minimum threshold pairs for use in verifying a subsequently captured print of the user.
40 Citations
20 Claims
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1. A method for use in print matching apparatus comprising the steps of:
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enrolling a print of a user; extracting a set of matching features from the enrolled print; comparing the extracted features of the enrolled print to extracted features of each print in a set of reference prints, wherein each reference print in the set is from a person other than the user, and determining a highest non-matching score; determining at least two minimum and maximum matched score threshold pairs based on characteristics of the print matching apparatus; and storing the matching features of the enrolled print, the highest non-matching score, and the at least two maximum and minimum matched score threshold pairs for use in verifying a subsequently captured print of the user, wherein the highest non-matching score and a selected one of the minimum and maximum matched score threshold pairs are used in determining a verification threshold used in verifying the subsequently captured print of the user. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 19)
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10. A method for use in print matching apparatus comprising the steps of:
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capturing a print; extracting a set of matching features from the captured print; retrieving matching features of a previously enrolled print of a user and a highest non-matching score for the user; selecting one minimum and maximum matched score threshold pair from a set of at least two pre-determined minimum and maximum matched score threshold pairs, wherein each minimum and maximum matched score threshold pair is based on characteristics of the print matcher apparatus; determining a verification threshold based at least on the highest non-matching score and the selected one minimum and maximum matched score threshold pair; and comparing the matching features of the captured print to the retrieved matching features based on the verification threshold to determine whether the captured print is that of the user. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 20)
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Specification