BS ISO/IEC BRITISH STANDARD 19794-3:2006 Information technologyBiometric data interchange formats - Part 3: Finger pattern spectral data ICS 35.040 BSi NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards BSISO/IEC19794-3:2006 National foreword This British Standard was published by BSI. It is the UK implementation of ISO/IEC19794-3:2006. The UK participation in its preparation was entrusted to Technical Committee IST/44, Biometrics. A list of organizations represented on IST/44 can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was Amendmentsissuedsincepublication published under the authority of the Standards Policy and Date Amd. No. Comments Strategy Committee on 29 September 2006 BSI 2006 ISBN0580492001 BSIS0/IEC 19794-3:2006 INTERNATIONAL ISO/IEC 19794-3 STANDARD First edition 2006-08-15 Information technology Biometric data interchange formats - Part 3: Finger pattern spectral data Technologiesde I'information-Formats d'echangede donnees biometriques Partie3:Donnéesspectrales de laformedudoigt Reference number ISO/IEC19794-3:2006(E) IEC TSO ii BSISO/IEC 19794-3:2006 Contents Page Foreword. Introduction.. vi 1 Scope 2 Conformance... 3 Normative references ... 4 Terms and definition... 5 Symbolsandabbreviatedterms Data conventions... 6.1 Byte and bit ordering... 5 6.2 Coordinate system..... 5 6.3 Greyscale precision.... 6.4 Image polarity... 6 6.5 Angle direction of rotation..... 6.6 Phase and propagation angles..... 7 Determination of finger pattern spectral data.......... 7.1 7.2 Step 0) [Optional] Image pre-processing.. 7.3 Step 1) Cellular partitioning.... 7.4 Step2)Spectralcomponentselection........ 7.4.1 Quantized co-sinusoidal triplets ... 7.4.2 Discrete Fourier Transform .. 7.4.3 Gabor filters.... 7.5 13 8 Fingerpatternspectral data record 8.1 Record header.. 14 8.1.1 Format identifier.. 8.1.2 Version number.. 5 8.1.3 Length of record .... 15 8.1.4 Number of single finger records. 8.1.5 x (horizontal) resolution ... 15 8.1.6 y (vertical) resolution.... 15 8.1.7 Number of cells in x-direction 15 8.1.8 Number of cells in y-direction.. 15 8.1.9 Number of pixels in cells in x-direction.... 5 8.1.10 Number of pixels in cells in y..direction....... 5 8.1.11 Numberofpixelsbetween cellcentres inx-direction... 15 8.1.12 Number of pixels between cell centres in y-direction... 16 8.1.13 Spectral component selection method... 6 8.1.14 Type of window..... 16 8.1.15 Standard deviation 16 8.1.16 Number of frequencies. 8.1.17 Frequencies......... 8.1.18 Numberoforientations 8.1.19 Number of spectral components to be retained per cell... 8.1.20 Bit-depth of propagation angle of co-sinusoidal function . 8.1.21 Bit-depth of wavelength of co-sinusoidal function.... 8.1.22 Bitdepth of phase.... 18 8.1.23 Bit-depth of magnitude.. 18 ii BSISO/IEC19794-3:2006 8.1.24 Bit-depth ofqualityscore. 18 8.1.25 Cellquality group granularity 19 8.1.26 Reservedbytes........ 19 8.2 Single finger record 8.2.1 8.2.2 Finger pattern spectral data block ... .20 8.2.3 Extended data block .... 8.3 Summaryoffingerpatternspectral datarecord. 28 9 Fingerpatternspectraldatacardformat... .31 Annex A(informative)Finger pattern spectral data record examples-quantized co-sinusoidal tripletspectral componentselectionmethod... ..33 A.1 Example 1. .33 A.2 Example2. A.3 Sizecomparisons .36 AnnexB(informative)Fingerpattern spectraldata record examples-DiscreteFourierTransform spectral componentselectionmethod... .37 B.1 Example1. .37 B.2 Example 2. ...38 Annex C (informative)Fingerpattern spectral data recordexample-Gaborfilterspectral componentselectionmethod. .40 Bibliography .42 iv BSISO/IEC19794-3:2006 Foreword Commission)form the specialized system for worldwide standardization. National Bodies t