ISO/IEC INTERNATIONAL STANDARD 19794-4 First edition 2005-06-01 Information technology Biometric data interchange formats - Part 4: Finger image data Technologies de I'information - Formats d'échange de données biometriques- Partie 4: Donnees d'image du doigt Reference number ISO/IEC 19794-4:2005(E) IEC Tso Copyright International Organization for Standardization @ISO/IEC2005 itted without license from IHS Not for Resale ISO/IEC 19794-4:2005(E) PDFdisclaimer This PDF file may contain embedded typefaces. In accordance with Adobe's licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In accepts no liability in this area. Adobe is a trademarkof AdobeSystems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters were optimized for printing. Every care has been taken to ensure that the file is suitable for use by IsO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below ?ISO/IEC2005 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, ISO's member body in the country of the requester. ISO copyright office Case postale 56 . CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail [email protected] Web www.iso.org Published in Switzerland CpyrighmatioalganzationfSdardizatio ISO/IEC2005-Allrightsreserved nittedwithout licensefromIHS Not for Resale ISO/IEC 19794-4:2005(E) Contents Page Foreword.. ..V Introduction 1 Scope. 2 Conformance. Normative references 4 Terms and definitions 5 Abbreviated terms 6 Data conventions. 6.1 Byte and bit ordering. 6.2 Scan sequence... 7 Image acquisition requirements 7.1 General ...... 7.2 Pixel aspect ratio 7.3 Pixel depth.... 7.4 Grayscaledata 7.5 Dynamicrange ..5 7.6 Scan resolution.. ..6 7.7 Image resolution... 7.8 Fingerprint image location, 8 Finger image record format. 8.1 Record structure. 8.2 General record header 8.2.1 Required fields 8.2.2 Format identifier. 8.2.3 Version number.. 8 8.2.4 Record length 8.2.5 CapturedeviceID 8.2.6 Imageacquisitionlevel 8.2.7 Number of finger/palm images. 8 8.2.8 Scale units 8.2.9 Scan resolution (horizontal) 8 8.2.10 Scan resolution (vertical) 8.2.11 Imageresolution (horizontal) 8.2.12 Imageresolution(vertical). ..9 8.2.13 Pixel depth.... ..9 8.2.14 Imagecompressionalgorithm ..9 8.2.15 Reserved.. 9 8.3 Finger record header. .10 8.3.1 Required fields... .10 8.3.2 Lengthoffinger/palmdatablock .10 8.3.3 Finger/palmposition... .10 8.3.4 Count of views . .11 8.3.5 View number.. .12 8.3.6 Finger/palmimage quality .12 8.3.7 Impressiontype 1 8.3.8 Horizontal line length. .12 8.3.9 Vertical line length. 8.3.10 Finger/palm image data Copyright Intemational Organization for Standardization 05 All rights reserved ii Not for Resale ISO/IEC 19794-4:2005(E) Annex A (normative) Image quality specifications A.1 Scope and purpose........... A.2 Fingerprint scanners ...13 A.2.1 Geometric image accuracy. A.2.2 Modulation transfer function.. A.2.3 Signal-to-noise ratio . ...14 A.2.4 Grayscale range of image data ...15 A.2.5 Grayscale linearity .. ...16 A.2.6 Output gray level uniformity ..16 A.3 Latent print scanners... A.3.1 Geometric image accuracy... A.3.2 Modulation transfer function... .17 Annex B (informative. Finger image data record example.......... Bibliography.. ..21 Copyright Intermationai Organization for Standardization @ISO/IEC2005—All rightsreserved No reprodu ense from IHS Not for Resale ISO/IEC 19794-4:2005(E) Foreword ISO (the International Organization for Standardization) and IEC (the International Electrotechnical Commission)formthespecializedsystemforworldwidestandardization.Nationalbodiesthataremembersof ISO or IEC participate in the deve