ISO/IEC 17839-2:2024 情報技術 — 生体認証システムオンカード — Part 2:物理的特性 | ページ 6

3.1.1

minutiae-based comparison algorithm

fingerprint biometric feature comparison algorithm, which relies on evaluating fingerprint minutiae data

Note 1 to entry: The fingerprint minutiae data format used can be the one defined in ISO/IEC 19794-2 or ISO/IEC 39794-2.

3.1.2

hybrid comparison algorithm

fingerprint biometric comparison algorithm, which relies on evaluating fingerprint minutiae data and extended feature data, such as ridge count data, curvature, delta and core singular points or any other proprietary vendor-specific data

Note 1 to entry: The fingerprint minutiae data format used can be the one defined in ISO/IEC 19794-2 or ISO/IEC 39794-2.

3.1.3

pattern comparison algorithm

either fingerprint biometric sample or biometric feature comparison algorithm, or both, which focuses on biometric sample image level correlation

Note 1 to entry: This category of algorithm typically tries to find a small fraction of a probe fingerprint image in a larger reference image or in a plurality of reference images obtained during a multi-touch enrolment (3.1.4) process. The data structures used in a pattern comparison algorithm are usually proprietary. A pattern comparison algorithm can evaluate lower level three fingerprint features, i.e. “micro-features” such as sweat pores, incipient ridges or ridge shapes.

3.1.4

multi-touch enrolment

enrolment process of multiple reference biometric samples

Note 1 to entry: Multiple reference biometric samples or biometric templates can be stored, or combined into a larger reference biometric sample or biometric template using image stitching algorithm (Note 3) or template stitching algorithm (Note 4) respectively

Note 2 to entry: Multi-touch enrolment is common in many smartphones with a small scan area fingerprint sensor.

Note 3 to entry: An image stitching algorithm is an algorithm assembling multiple captured biometric samples of the fingerprint into a larger reference biometric sample image (as if it was captured using large scan area fingerprint sensor) using pattern comparison algorithm (3.1.3).

Note 4 to entry: A template stitching algorithm is an algorithm assembling biometric feature reference templates (e.g. ISO/IEC 19794-2 or ISO/IEC 39794-2 minutiae data) extracted from multiple captured biometric samples of the fingerprint into a larger reference biometric template (as if it was extracted from biometric sample captured using large scan area fingerprint sensor) using minutiae-based comparison algorithm (3.1.1) or hybrid comparison algorithm (3.1.2).

3.1.5

enrolment update

process of merging the current biometric probe’s biometric sample data or biometric feature data into a biometric reference, e.g. enrolled using multi-touch enrolment

Note 1 to entry: In a Biometric System-on-Card (BSoC) context, an enrolment update can happen after card issuance to update biometric reference data that can be stored in a secure element. An enrolment update helps when using features that are not consistent over a longer time period or capture environment dependent.

3.1.6

capture area

area of a biometric capture device that captures biometric data, e.g. a fingerprint or dynamic signature