ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information• The third information item (‘y’ coordinate / MYC) isexpressed in pixel units.• The fourth information item (minutia angle / MAV) isrecorded in units of two degrees. This value shall be nonnegativebetween 0 and 179.• The fifth information (minutia type / MTY) has a value of “0”to represent a minutiae of type “OTHER”, a value of “1” for a ridgeending and a value of “2” for a ridge bifurcation.• The sixth information item (quality of minutia / QOM) shallrange from 1 as a minimum to 100 as a maximum. A value of “0”indicates that no quality value is available.13.6.13 Field 9.138: 19794-2 Ridge count information / RCIThis field shall consist of a series of subfields.The first subfield (ridge count method / RCM) has three information items:• The first information item (ridge count extractionmethod / REM) may have a value of 0,1 or 2. A “0” indicates thatno assumption shall be made about the method used to extractridge counts, nor their order in the record. A “1” indicates that foreach center minutiae, ridge count data was extracted to the nearestneighboring minutiae in four quadrants, and ridge counts for eachcenter minutia are listed together. A “2” indicates that for eachcenter minutiae, ridge count data was extracted to the nearestneighboring minutiae in eight octants, and ridge counts for eachcenter minutia are listed together.• The remaining two information items (Filler 1 / FI1and Filler 2 / FI2) of this first subfield shall each contain “0”.Subsequent subfields (ridge count data / RCD) have three information itemseach.• The first information item (center minutia index /CMI) is a number• The second information item (neighboring minutiaindex / NMN) is a number, and• The third information (number of ridges crossed /NRC) is a number.48DRAFT 2