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Building Blocks

Biometric systems consist of seven basic modules: user interface, quality check, enhancement, feature extractor, database, matcher, and decision module, which work sequentially for user recognition. The design of a biometric system involves selecting the architecture, hardware and software components, and defining administration policies. Biometric functionalities are categorized into verification, where the system confirms a claimed identity, and identification, where the system matches the input against all enrolled templates.

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10 views7 pages

Building Blocks

Biometric systems consist of seven basic modules: user interface, quality check, enhancement, feature extractor, database, matcher, and decision module, which work sequentially for user recognition. The design of a biometric system involves selecting the architecture, hardware and software components, and defining administration policies. Biometric functionalities are categorized into verification, where the system confirms a claimed identity, and identification, where the system matches the input against all enrolled templates.

Uploaded by

Deepa S
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
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18CSE357T – BIOMETRICS

Unit –1 : Session –2 : SLO -2

SRM Institute of Science and Technology 1


BUILDING BLOCKS OF BIOMETRIC SYSTEMS
• In general, biometric systems consist of seven
basic modules that operate sequentially .
• These building blocks or modules include (i) a
user interface incorporating the biometric
reader or sensor,
• (ii) a quality check module to determine
whether the acquired biometric sample is of
sufficient quality for further processing,
• (iii) an enhancement module to improve the
biometric signal quality,
•
• (iv) a feature extractor to glean only the useful
information from a biometric sample that is
pertinent for the person recognition task,
• (v) a database to store the extracted features
along with the biographic information of the
user,
• (vi) a matcher to compare two feature sets
during recognition and to determine their
degree of similarity and
• (vii) a decision module that determines the
user identity based on the similarity (match
scores) output by the matcher
• Though all biometric systems are composed of the
same basic modules, there are three main steps
involved in the design of a biometric system.
• Firstly, the designer needs to choose the appropriate
architecture for a biometric system.
• Secondly, the hardware and software components
required for the implementation of the architecture
must be selected.
• Finally, appropriate policies must be defined for the
effective administration of the biometric system
• The functionalities provided by a biometric
system can be broadly categorized as verification
and identification .

• In verification, the user claims an identity and the


system verifies whether the claim is genuine by
comparing the input biometric sample to the
template corresponding to the claimed identity.
• In identification, the user’s biometric input is
compared with the templates of all the persons
enrolled in the database and the system
returns either the identity (in some scenarios,
multiple identities whose templates have high
similarity to the user’s input may be returned
by the system.).
• Of the person whose template has the highest
degree of similarity with the user’s input or a
decision indicating that the user presenting the
input is not an enrolled user

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