NEN-ISO/IEC 20027 : 2018 en

Foreword........................................................................................................................................................................................................................................iv
Introduction..................................................................................................................................................................................................................................v
1 Scope.................................................................................................................................................................................................................................1
2 Normative references......................................................................................................................................................................................1
3 Terms and definitions.....................................................................................................................................................................................1
4 Sensor hardware requirement..............................................................................................................................................................2
5 Acquisition software.........................................................................................................................................................................................2
5.1 Acquisition process............................................................................................................................................................................. 2
5.2 User feedback........................................................................................................................................................................................... 2
5.3 Acquisition check.................................................................................................................................................................................. 3
5.4 Image processing.................................................................................................................................................................................. 3
5.4.1 Resolution.............................................................................................................................................................................. 3
5.4.2 Segmentation...................................................................................................................................................................... 3
5.4.3 Compression........................................................................................................................................................................ 4
6 Logging and evaluation of data..............................................................................................................................................................4
6.1 Logging data.............................................................................................................................................................................................. 4
6.2 Useful statistical evaluations ...................................................................................................................................................... 5
7 Operational process..........................................................................................................................................................................................5
7.1 General user guidance...................................................................................................................................................................... 5
7.2 Acquisition process recommendations.............................................................................................................................. 8
8 Operational issues ...........................................................................................................................................................................................10
8.1 Placement recommendations..................................................................................................................................................10
8.2 Calibration recommendations................................................................................................................................................10
8.3 Cleaning recommendations......................................................................................................................................................11
8.4 Operator recommendations .....................................................................................................................................................11
Annex A (informative) Example of an acquisition process.........................................................................................................12
Annex B (informative) Example of an acquisition process based on composite records ...........................13
Annex C (informative) Example of a quality assurance process for the build of a composite
record............................................................................................................................................................................................................................15
Bibliography.............................................................................................................................................................................................................................16

This document provides guidelines to follow during the acquisition process of slap tenprints in order to obtain fingerprints of the best quality possible within acceptable time constraints. Non-cooperative users are out of the scope of this document. When using ten-fingerprint sensors, it is fundamental to know how to use them and how to proceed
with the acquisition. This document describes how to capture fingerprints correctly by specifying best practices for slap tenprint captures. It gives recommendations on the following topics: 1) hardware of the fingerprint sensor and its deployment; 2) user guidance; 3) enrolment process including a sample workflow; 4) application software for developers and system integrators; 5) processing, compression and coding of the acquired fingerprint images; 6) operational issues and data logging; 7) evaluation of a solution and its components. Although this document primarily focuses on reaching optimal data quality for enrolment purposes, the recommendations given here are applicable for other purposes. All processes which rely on good quality tenprint slaps can take advantage of the best practices.