ISO IEC 25447 更少約束人臉捕捉.pdf

1、CONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 1ISO/IEC 25447Less constrained face captureAPRIL 1 2025Udo MahlmeisterDirector Applied ResearchIFPC 2025CONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 2ISO/IEC 25447Face image profile for less constrained capture conditions WD2expected publication

2、 end of 2026to be folded into Annex D of ISO/IEC 397945 after its adoption by ICAOEditor/Co-editors:Contributors from CN,DE,AU,GB,FR,JPUdo Mahlmeister USAndreas Wolf DEBill Perry AUMichael Matheson AULi Wei CNAmbika Suman GBOlaf Henninger DEMasahiro Hayashitani JPPierre Gacon FRJames Wayman GBothers

3、youCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 3CONFIDENTIAL PROPRIETARY|SECURE IDENTITY,LLC 2023 3OverviewISO/IEC 25447 Less constrained capture conditionsLess constrained than what?Which requirements will be more relaxed?Why?When to use this profileCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LL

4、C 2024 4CONFIDENTIAL PROPRIETARY|SECURE IDENTITY,LLC 2023 4Less Constrained Than What?ISO/IEC 25447 Less constrained capture conditionsAnnex D Application profilesAnnex D.1 Reference face image for MRTDs(to be adopted by ICAOAnnex D.2 General Purpose Face ImageAnnex D.3 3D Texture Face ImageISO/IEC

5、3979452019Extensible biometric data interchange formatsPart 5 Face image dataCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 5CONFIDENTIAL PROPRIETARY|SECURE IDENTITY,LLC 2023 5Less Constrained Than What?ISO/IEC 25447 Less constrained capture conditionsAnnex D.2 General Purpose Face Image1.JPEG ba

6、seline,JPEG2000 Part-1,mild compression or PNG(shall)2.Head pose:pitch5,yaw5,roll8(shall),pitch,yaw,roll 5(should)3.Illumination even,ratio between two patches shall be btw.0.5 and 2.0(shall)4.Hot spots and reflections on glasses absent,illumination diffuse or balanced(shall)5.Contrast:texture of fa

7、cial skin clearly visible(shall)6.Nose to ears and chin to crown in focus,features 1mm visible(shall)7.Expression neutral,eyes open,mouth closed(should)8.Head coverings absent,unless approved by regulation(should)9.Shoulder pose square to the camera(shall)10.Optimum height of camera at eye level(sho

8、uld)11.At least 180 pixels head width or approx.90pxl between the eyes(shall)12.Glasses either transparent or removed(should)13.Pupils and irises visible(shall)14.Fisheye effect not present(shall)15.Frames shall not obscure eyes;their thickness shall be at most 5%IED(shall)16.Gaze:subject should loo

9、k into the camera(should)17.Eye patches shall not be worn,unless for medical reasons(shall)18.Hair does not cover face(should)19.Landmarks to be determined,before compression(should)20.24-bit color images,after gray conversion,face region covers 7 bits(should)ISO/IEC 3979452019Extensible biometric d

10、ata interchange formatsPart 5 Face image dataCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 6Which requirements will be more relaxed?ISO/IEC 25447 Less constrained capture conditions1.Sampling rate from 90 to 60 pxls between eyes2.Pose angle tolerance from 5 in yaw,pitch,8 in roll to 15 in yaw,pi

11、tch,20 in roll3.Illumination evenness from 1 F-stop to 2 F-stops4.Graylevel range from 7 bits to 6 bitsAll other shalls and shoulds are adopted from ISO/IEC 3979452019 Annex D.2CONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 7Which requirements will be more relaxed?ISO/IEC 25447 Less constrained c

12、apture conditionsMinimum sampling rate:60 pxls between eyesCNN input layers are too small to use pixels 60 pxls IEDreduction in camera cost OR more light sensitivityCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 8Which requirements will be more relaxed?ISO/IEC 25447 Less constrained capture condi

13、tionsIllumination evenness:2 F-stopsFR models have long been trained on unevenly lit facessaves dedicated illuminatorsCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 9Which requirements will be more relaxed?ISO/IEC 25447 Less constrained capture conditionsGray level range:6 bitsFR models work well

14、 on imperfectly exposed faces as long as there is no black out or saturationallows simpler exposure control and covers more skin tonesCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 10Which requirements will be more relaxed?ISO/IEC 25447 Less constrained capture conditionsPose angle tolerances Yaw

15、 15Pitch 15Roll 20virtually all FR models were trained on pose angles much larger than 5easier on usersless expensive non-height-adjustable cameras can be usedCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 11Why?ISO/IEC 25447 Less constrained capture conditions1.Retail,medical providers,transport

16、ation,and finance wantlow-cost cameras and illuminationbetter user experience2.State-of-the-art face algorithms deliver nearly same accuracyaccording to four leading face vendors communicationsbased on CLEAR-internal tests3.Commercial and government system increasingly interoperatethey benefit from

17、a common denominator in image quality4.ISO/IEC 3979452019 Annex D requirements are a little outdatedCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 12CONFIDENTIAL PROPRIETARY|SECURE IDENTITY,LLC 2023 12When to use this profile?ISO/IEC 25447 Less constrained capture conditionsThis profile is a good

18、 fit if you needmachine face recognition onlyconvenient and fast face captureremote self-capturelow camera and system cost Use profiles in ISO/IEC 397945 instead if you need tomanually adjudicateproduce government ID documents,such as eMRTDs or visasCONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 13Questions,Input?CONFIDENTIAL PROPRIETARY SECURE IDENTITY,LLC 2024 14