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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONComplete Scar (SR) and Dissociated Ridges/Dysplasia (DR) should only be noted if thefingerprint cannot be classified. If the print can be classified and scar(s), dissociated ridges,and/or dysplasia are present, this field should note the classification(s) and the scar(s),dissociated ridges, and/or dysplasia should be noted in Field 9.324: EFS distinctive features /DIS. The use of Field 9.322: EFS core delta ridge counts / CDR can be used to furthersubcategorize pattern classification.F.6.3Reference pointsF.6.3.1 Field 9.321: EFS deltas / DEL instructionsThis field is described in Section 8.9.7.17.For fingerprints, one or more deltas are defined for all pattern classifications other than plainarches, as shown in Table 40 EFS delta codes. Note that tented arches should have deltasmarked if such a structure is present. Accidentals may have any number of deltas. Mostpalmprints contain four interdigital deltas and one carpal delta. Other delta-like patterns may bedefined using this field if such structures are present in friction ridge images.This field consists of the following information items:The first two information items are mandatory. ('x' coordinate / DXC and 'y' coordinate /DYC). They define the location of the delta, in units of 10 micrometers (0.01mm).The next three optional information items (direction up / DUP, direction left / DLF, anddirection right / DRT) define the three directions of the delta, in degrees counterclockwisefrom the right. The three angles shall be reported in order by increasing angle, which forfingerprint deltas with known orientation will result in the order up, left, then right. These threeinformation items may be omitted (left empty).The sixth information item, type / DTP, is optional. It defines the type of delta, as defined inTable 40 EFS delta codes.The seventh information item, radius of position uncertainty / RPU, is optional. It defines theradius of a circle centered at the location (X,Y) of the delta; the circle is sized to include the areaof other possible locations of the delta, if the precise location cannot be determined (such as dueto poor clarity). If the location is known precisely, the radius of position uncertainty may beomitted 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 image.The eighth through tenth information items (direction uncertainty up / DUU, directionuncertainty left / DUL, and direction uncertainty right / DUR ) contain the uncertainty ofthe three delta angles, in non-negative integer degrees. Valid values range from “0” to “180”: avalue of “0” (default) indicates a certain direction, while a value of “180” indicates an unknownMay, 2013 DRAFT VERSION UPDATE 2013 Page 493