Dynamic thresholding for a fingerprint matching system
AssigneeMotorola, Inc.
InventorPeter Z. Lo
Life of this patent
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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.
Claims20
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.
A method for use in print matching apparatus comprising the steps of:
- 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.
Dependencies are inferred from the claim text.