acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONorientation. If one or more deltas are present and the features set is from a fingerprint, Field9.307: EFS pattern classification / PAT should be defined. Note that this does not mean thatthe classification has to be known definitively, but must at least be known to the extent ofexcluding plain arches.Figure 34: Palm with carpal delta and interdigital deltas 7-10 markedF.6.3.2 Field 9.323: EFS center point of reference / CPR instructionsThis field, described in Section 8.9.7.19, contains the location of a center point of reference of afingerprint, which can be used to define how centered a fingerprint is, as a feature, forregistration or orientation, and for quality measurements. While the core may serve some of thesame purposes, a center point of reference is defined for arches and provides a single centerlocation for complex whorls, unlike cores.The location of a center point of reference can bedetermined using different algorithms, as stored in the Method information item, in which casedifferent center points of reference may be stored in different subfields.The center point of reference is defined for fingerprints or toeprints, not for other types offriction ridge images. This field consists of the following information items:The first information item is the method / CPM of determining the X,Y location, selected fromTable 119. (This is an expanded version of Table 41).The second and third information items ('x' coordinate / PXC and 'y' coordinate / PYC) arethe location of the center point of reference, as defined in CPM, stated in units of 10micrometers (0.01mm)494