Developer Guide - Revised June 14, 2017 (Version 3.0.1) - Specifications subject to change

Nov 2, 2026

Developer Guide introduces Crossmatch’s developer documentation for U.are.U-related manuals, including what’s new, how the guides are organized, how to obtain updated documentation, and how the book is arranged. It defines data formats and standards, then covers biometric technology background: features, fingerprint identification basics, and issues in recognition. It also explains how fingerprint recognition works, data flow, enrollment and identify/verify workflows, distributed processing, compression methods (WSQ, PNG), and NFIQ-based quality and error threshold guidance, plus reader support and SDK upgrading.

LanguageEnglish

CategoryTechnology

FormatPDF

Pages88

Reading Time3 h 42 min

AccessFree to download

Introduction

What’s New?

How the U.are.U Manuals are Organized

Getting Updated Documentation

Target Audience

How this book is arranged

Data Formats and Standards

Background

Biometrics

Features of Biometric Technology

The Basics of Fingerprint Identification

Issues in Fingerprint Recognition Technology

Developing Applications

How Fingerprint Recognition Works

Understanding the Data Flow

Workflow-Enrollment Application

Workflow-Identifying/Verifying

Design Issues for your Application

Distributed Processing and Data Flow

Data Compression

WSQ Compression

PNG Compression

NIST Fingerprint Image Quality (NFIQ)

Determining an Acceptable Level of Error

Setting the Error Threshold when Identifying a Fingerprint in a Collection

Defining the Data Retention Policy

Specifying the Fingers to Be Scanned

Optimizing Fingerprint Applications

Working with Fingerprint Readers

Upgrading from Previous SDKs

Overview of Support for Previous SDKs

Working with Existing Data Created with Previous SDKs

Exchanging Data with Applications Using Previous SDKs

Upgrading Applications from Previous SDKs

Converting Applications from the One Touch S

Developer Guide Copyright © 2006-2017 Crossmatch. All rights reserved. Specifications are subject to change without prior notice. The Crossmatch logo, Crossmatch™, Cross Match®, DigitalPersona®, TouchChip®, Eikon®, U.are.U® and FingerJet™ are trademarks or registered trademarks of Cross Match Technologies, [Inc. in](Inc. in) the United States and other countries. All other brand and product names are trademarks or registered trademarks of their respective owners. Revised: June 14, 2017 (version 3.0. 1) Contents INTRODUCTION 7 What’s New? ................................................................................................................................................. 7 How the U.are.U Manuals are Organized ...................................................................................................... 7 Getting Updated Documentation .................................................................................................................. 8 Target Audience ............................................................................................................................................ 8 How this book is arranged............................................................................................................................. 8 Data Formats and Standards ........................................................................................................................ 8 BACKGROUND 9 Biometrics ...................................................................................................................................................... 9 Features of Biometric Technology................................................................................................................. 9 The Basics of Fingerprint Identification ......................................................................................................... 9 Issues in Fingerprint Recognition Technology ............................................................................................ 10 DEVELOPING APPLICATIONS 11 How Fingerprint Recognition Works............................................................................................................ 11 Understanding the Data Flow ...................................................................................................................... 11 Workflow-Enrollment Application .............................................................................................................. 12 Step One-Initialization ........................................................................................................................... 12 Step Two-Capture, Extract and Enroll .................................................................................................. 12 Step Three-Store Data .......................................................................................................................... 13 Notes on Enrollment ............................................................................................................................... 13 Workflow-Identifying/Verifying................................................................................................................... 13 Step One-Initialization ........................................................................................................................... 13 Step Two-Capture and Extract ............................................................................................................. 13 Step Three-Identify/Verify ..................................................................................................................... 13 Design Issues for your Application .............................................................................................................. 13 Distributed Processing and Data Flow ..................................................

FAQs

What does the Developer Guide cover at a high level?

It explains how U.are.U manuals are organized, introduces biometric and fingerprint recognition concepts, and provides developer workflows for enrollment and identification/verification. It also covers data formats, compression options, image quality (NFIQ), error thresholds, data retention, and SDK upgrade considerations.

How does the guide describe the data flow in fingerprint recognition?

It presents the recognition process as a data flow that supports enrollment and identify/verify workflows. The guide includes steps such as initialization, capture/extract/enroll, and storing data or performing identify/verify actions.

What compression and quality topics are included?

The guide covers data compression approaches including WSQ compression and PNG compression. It also discusses NIST Fingerprint Image Quality (NFIQ) and how to determine acceptable error levels and set error thresholds when identifying fingerprints in a collection.

Nov 2, 2026

Uploaded by Rainbow Cat