ISO/IEC INTERNATIONAL STANDARD 39794-4 Firstedition 2019-12 Information technology - Extensible biometricdatainterchangeformats- Part 4: Finger image data Referencenumber IEC IS0/IEC39794-4:2019(E) ISO IS0/IEC2019 IS0/IEC39794-4:2019(E) COPYRIGHTPROTECTEDDOCUMENT ISO/IEC2019 All rights reserved.Unless otherwise specified,orrequired in thecontext ofits implementation,no partofthispublication may bereproducedorutilizedotherwiseinanyformorbyanymeans,electronicormechanical,includingphotocopying,orposting on the internetor an intranet, without prior written permission.Permission can be requested from eitherIsO at the address beloworIso'smemberbodyinthecountryoftherequester. ISocopyrightoffice CP401:Ch.de Blandonnet8 CH-1214Vernier,Geneva Phone:+41227490111 Fax: +41 22749 0947 Email:[email protected] Website:www.iso.org Published in Switzerland ii IS0/IEC2019-Allrightsreserved IS0/IEC39794-4:2019(E) Contents Page Foreword .v Introduction ..vi 1 Scope.. .1 2 Normativereferences 1 3 Terms and definitions .1 4 Abbreviatedterms .5 5 Conformance. .6 6 Modalityspecificinformation .6 6.1 Capturerecommendations 6 6.1.1 Fingerprintimage 6.1.2 Palmimage 6.2 Image coordinate system considerations 7 6.3 Imagerepresentationrequirements 7 6.3.1 General. .7 6.3.2 Colorspace. .7 6.3.3 Pixel aspect ratio 7 6.3.4 Bit-depth 8 6.3.5 Imagespatial samplingrate .8 7 Abstractdataelements .8 7.1 Purposeand overall structure 8 7.2 Finger imagedata block 9 7.3 Versionblock 9 7.4 Representationblocks 10 7.5 Position.. .10 7.6 Impression 10 7.7 Imagedataformat .11 7.7.1 Supported data format 11 7.7.2 PGMencoding definition 11 7.8 Imagedata. 12 7.9 Capturedate/timeblock 12 7.10 Capturedeviceblock.. .12 7.10.1 Model identifierblock 12 7.10.2 Capturedevicetechnologyidentifier 12 7.10.3 Certificationidentifierblocks 13 7.11 Qualityblocks. .14 7.12 Spatial samplingrateblock. 14 7.13 Position computedbycapturedevice .14 7.14 Original rotation .14 7.15 Image rotated tovertical. .14 7.16 Imagehasbeenlossilycompressed .14 7.17 Segmentationblocks .15 7.18 Annotation blocks 15 7.19 PADdatablock 15 7.20 Commentblocks 16 7.21 Vendorspecificdatablocks 16 8 Encoding. .16 8.1 Tagged binary encoding .16 8.2 XMLencoding 16 9 RegisteredBDBformatidentifiers .16 AnnexA(normative)Formal specifications .17 IS0/IEC2019-All rightsreserved ili IS0/IEC39794-4:2019(E) AnnexB(informative)Encodingexamples .29 AnnexC(normative)Conformancetestingmethodology AnnexD (normative)Capturedevicecertifications .38 AnnexE(informative)Conditionsforcapturingfingerprintimagedata .62 AnnexF(normative)WsQgreyscalefingerimagecompressionspecification .71 Bibliography .97 iv IS0/IEC2019-Allrightsreserved IS0/IEC39794-4:2019(E) Foreword ISo(the International Organizationfor Standardization)and IEC (the InternationalElectrotechnical Commission)form the specialized systemfor worldwide standardization.Nationalbodies that are members of Iso orIECparticipate inthedevelopment of InternationalStandards through technical committees established bytherespectiveorganization todeal with particularfieldsof technical activity.IsO andIEC technical committees collaborate in fields of mutual interest.Other international organizations,governmental and non-governmental,in liaison with Iso and IEC,also take part in the work. The procedures used to develop this document and those intended for its further maintenance are described in theISo/IEc Directives, Part 1.In particular, the different approval criteria needed for the different types of document should be noted.This document was drafted in accordance with the editorial rules oftheISo/IECDirectives,Part2 (seewww.iso.org/directives). Attention is drawntothepossibilitythat some oftheelements of thisdocument maybethe subject of patentrights.IsoandIEC shall notbeheldresponsibleforidentifyinganyorall suchpatent rights.Details of any patent rights identified during the development of the document will be in the Introductionand/orontheIsolistofpatentdeclarationsreceived (seewww.iso.o