A company has installed a new fingerprint clocking system to control the time attendance of its employees. One day, three fingerprints of three different employees are presented to the system: FP1, FP2 and FP3. Minutia pair = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15. FP1: Difference (%) = 10, 2, 5, 6, 4, 1, 3, 2, 1, 2, 1, 5, 4, 3, 5. FP2: Difference (%) = 8, 9, 1, 10, 6, 4, 2, 7, 5, 1, 9, 6, 8, 10, 3. FP3: Difference (%) = 1, 5, 4, 8, 3, 2, 10, 5, 2, 2, 4, 5, 1, 3, 6. During the authentication process, assume that a minutiae based matching is used and that after the live image and the stored one are translated and superimposed, 15 minutiae pairs are identified and their differences are evaluated. a. The similarity value is defined as the percentage of minutiae pairs for which the differences are strictly less than 5%. Find the similarity value for each fingerprint image (FP1, FP2 and FP3). Show your calculations. b. The threshold is set to 65%, identify which fingerprint(s) is/are considered as match and which one(s) is/are considered as not match. Explain. c. Though the three fingerprints correspond to three legitimate employees, we still have “not match(s)”. Give three reasons for such a false non match.
A company has installed a new fingerprint clocking system to control the time attendance of its employees. One day, three fingerprints of three different employees are presented to the system: FP1, FP2 and FP3.
Minutia pair = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.
FP1: Difference (%) = 10, 2, 5, 6, 4, 1, 3, 2, 1, 2, 1, 5, 4, 3, 5.
FP2: Difference (%) = 8, 9, 1, 10, 6, 4, 2, 7, 5, 1, 9, 6, 8, 10, 3.
FP3: Difference (%) = 1, 5, 4, 8, 3, 2, 10, 5, 2, 2, 4, 5, 1, 3, 6.
During the authentication process, assume that a minutiae based matching is used and that after the live image and the stored one are translated and superimposed, 15 minutiae pairs are identified and their differences are evaluated.
a. The similarity value is defined as the percentage of minutiae pairs for which the differences
are strictly less than 5%. Find the similarity value for each fingerprint image (FP1, FP2 and FP3). Show your calculations.
b. The threshold is set to 65%, identify which fingerprint(s) is/are considered as match and which one(s) is/are considered as not match. Explain.
c. Though the three fingerprints correspond to three legitimate employees, we still have “not match(s)”. Give three reasons for such a false non match.
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