ISO/IEC 29794-1:2016 情報技術—生体認証サンプル品質—パート1：フレームワーク | ページ 6

4.1

acquisition fidelity

fidelity (4.6) of a sample attributed to the acquisition process

4.2

character

contributor to quality (4.11) of a sample attributable to inherent properties of the source (4.17)

4.3

environment

physical surroundings and conditions where biometric capture occurs, including operational factors such as operator (4.9) skill and enrolee cooperation level

4.4

extraction fidelity

component of the fidelity (4.6) of a sample attributed to the biometric feature extraction process

4.5

extrinsic

when used to describe a quality score (4.12) , requiring reference to an external source (4.17) , such as a standard, register, or technical specifications for full interpretation (4.8) and normalisation

4.6

fidelity

expression of how accurately a biometric sample represents its source (4.17) biometric characteristic

Note 1 to entry: The fidelity of a sample comprises components attributable to one or more of the processing steps: acquisition, extraction, signal processing.

4.7

intrinsic

when used to describe a quality score (4.12) , conveying fully interpreted (4.8) , normalised data without the requirement for additional extrinsic (4.5) information for quality score normalisation (4.13)

4.8

interpretation

process of analysing a quality score (4.12) along with other data in order to give that score contextual, relative meaning

4.9

operator

individual who processes a capture subject in a biometric system, performing or supervising capture and recapture

4.10

performance

assessment of false match rate, false non-match rate, failure to enrol rate and failure to acquire rate of a biometric system

4.11

quality

degree to which a biometric sample fulfils specified requirements for a targeted application

Note 1 to entry: Specified quality requirements may address aspects of quality such as focus, resolution, etc. Implicit quality requirements address the likelihood of achieving a correct comparison result.

4.12

quality score

quantitative expression of quality (4.11)

4.13

quality score normalisation

rescaling of quality scores (4.12) to improve consistency in scale and interpretation (4.8)

4.14

quality score normalisation dataset

QSND

dataset of biometric samples annotated with quality scores (4.12) for use in quality score normalisation (4.13)

Note 1 to entry: Target quality scores may be assigned on the basis of performance (4.10) outcomes using the sample in question, or may be based on quality factors recorded in acquisition of the dataset.

4.15

quality score percentile rank

QSPR

percentile rank of the quality score (4.12) of a biometric sample, derived from its own utility score and those of other samples in an identified control dataset

Note 1 to entry: See QSND (4.14) .

4.16

raw quality score

quality score (4.12) that has not been interpreted (4.8) , either by the creator or recipient of the score, and alone may not intrinsically provide contextual information

4.17

source

physical body part or function represented by a biometric sample

4.18

utility

observed performance (4.10) of a biometric sample or set of samples in one or more biometric systems

Note 1 to entry: The character (4.2) of the sample source (4.17) and the fidelity (4.6) of the processed samples contribute to, or similarly detract from, the utility of the sample.

Note 2 to entry: Utility may combine performance measures such as false match rate, false non-match rate, failure to enrol rate, and failure to acquire rate.