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

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ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information• The fifth information item (Radius of position uncertainty / MRU) definesthe radius of a circle centered at the location (X,Y) of the minutia 35• The sixth information item (Direction uncertainty / MDU) contains aninteger value from “0” (default) to “180” indicating the precision in thedirection (theta) of the minutia, measured in degrees. The resultingdirection is Theta±Uncertainty°. 36Distinctive Features (DIS).•35 The circle is sized to include the area of other possible locations of the minutia, if the precise location cannotbe determined (such as due to poor consistencyof presentation). If the location is known precisely, the radius of positionuncertainty may be omitted or set to 0. The radius of uncertainty is measured in integer units of 10 micrometers (0.01mm),and may overlap the edge of the Region of Interest.36Examples of cases in which confidence in direction may be low include cases when the ridge stops or bends close tothe minutia so that a good angle measurement cannot be taken, or cases with three equally spaced legs.•98DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationTable 30: EFS Codes for minutia typesCodeEBXRidge endingRidge bifurcationDescriptionEither ridge ending or bifurcation, notclearly distinguishable13.9.36 EFS Field 9.332 Minutiae Ridge Count Algorithm / MRAThis optional field defines the algorithm used in determining how neighboringminutiae are selected for use in the ridge counts in the Minutiae Ridge Counts(MRC) field. The value for this field shall be selected from Table 19.Table 31: EFS Codes for minutiae ridge count algorithmsCodeOCTANTEFTS7DescriptionThe minutiae used for ridge counts are the nearestneighbors in eight octants, with the center of the0th octant defined by the current minutia’s theta,and the 1st through 7th octants proceedingcounter clockwise. Ridge count values are set tonumber of intervening ridges. (Default)Identical to OCTANT algorithm, except that ridgecount values are one more than the number ofintervening ridges. See [EFTS7] 37 for furtherdetails.5.37 Federal Bureau of Investigation, “Electronic Fingerprint Transmission Standard”, Version 7.1.99DRAFT 2
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