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 Information13.9.37 EFS Field 9.333 Minutiae Ridge Counts / MRCThis field contains the counts of intervening ridges between specified minutiae.Field 9.332 Minutia Ridge Count Algorithm / MRA governs how the minutiaeare selected for ridge counts, and the details of how the ridges are counted. Notethat if Field 9.382: Skeletonized image / SIM is used for ridge counts it can bederived from that field rather than included explicitly. This field consists of fiveinformation items:• The first information item (Minutia Index A / MIA) contains the index ofthe first minutia.• The second information item (Minutia Index B / MIB) contains the indexof the second minutia.• The third information item (Ridge count / MIR) contains the number ofintervening ridges between minutiae A and B. 38• The fourth information item (Reference number / MRN) is optional and, ifused, containsa reference number specific to the ridge count algorithm. 39• The fifth information item (Residual / MRS) is optional and is specific tothe OCTANT and EFTS7 ridge count algorithms, specifying the half of theoctant in which the neighboring minutia lies. The residual is 0 if theneighboring minutia lies in the clockwise half of the octant, or 1 if theminutia lies in the counterclockwise half of the octant.Brad Wing 6/29/10 3:49 PMComment: Rewritten for consistency ofpresentation13.9.38 EFS Field 9.334 No Minutiae Present / NMPThis optional field is used to indicate whether the analysis process hasdetermined that no minutiae (Field 9.331 Minutiae / MIN) could be discerned inthe image:If the analysis process has determined that no minutiae could be discerned inthe image, this field shall be set to Y.Otherwise, this field will be omitted.•38 Unknown ridge counts shall be omitted (left empty). Other details or special cases (if any) are governed bythe Minutiae Ridge Count Algorithm (MRA) field.•100DRAFT 239For the OCTANT and EFTS7 ridge count algorithms, this information item specifies the octant
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information13.9.39 EFS Field 9.335 Minutiae Ridge Count Confidence / RCCThis optional field is used to indicate confidence in intervening ridge countsbetween any two points. While primarily used to indicate ridge count confidencebetween minutiae, this confidence measure can also apply to other features suchas Core/Delta ridge counts. If this field not used, the default assumption is thatthe ridge counts were manually determined. This field provides a means to savestate when only a portion of ridge counts have been manually checked.This field consists of six information items:• The first information item (AX / AXC) contains the x coordinates for PointA, in units of 10 micrometers (0.01mm).• The second information item (AY / AYC) contains the y coordinates forPoint A, in units of 10 micrometers (0.01mm).• The third information item (BX / BXC) contains the x coordinates for PointB, in units of 10 micrometers (0.01mm).• The fourth information item (BY / BYC) contains the y coordinates forPoint B, in units of 10 micrometers (0.01mm).• The fifth information item (Method of Ridge Counting / MRC) states themethod by which ridge counts were determined and/or validated selectedfrom Table 32.• The sixth information item (Confidence value / MCV) contains theconfidence value for a ridge count from 0 to 99, with 0 indicating noconfidence.Table 32EFS Codes for methods of ridge countingValue DefinitionA AutoT Manual TracingM Manual Ridge CountDescriptionThe ridge count was automaticallyperformed without human reviewThe ridge count was automaticallydetermined, based on a skeletonised imagecreated by a human examiner.The ridge count was determined or validatedmanually by a human examiner.101DRAFT 2
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