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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONsubjects between capture, such as in comparing an adult’s fingerprints with those taken asa child. In these cases the size of ridges and distances between ridges change to a greaterextent than would ordinarily be assumed in comparisons; this field acts as a flag toindicate that greater than ordinary dimensional variation should be expected inperforming subsequent comparisons.This field is to be omitted unless there is reason to believe that growth or shrinkage mayhave occurred. This field consists of two information items:• The first information item (type / TGS) is selected from the “Code” columnTable 38. It is one character.• The second information item (growth or shrinkage comment / CGS)contains optional text describing the rationale for believing that growth orshrinkage may have occurred.Table 38 Growth or shrinkage codesCodeGSBDescriptionGrowth: impression is believed to be dimensionallylarger than exemplars or other prints from the samesubject.Shrinkage: impression is believed to be dimensionallysmaller than exemplars or other prints from the samesubject.Both: impression may be dimensionally larger or smallerthan exemplars or other prints from the same subject.8.9.7.16 Field 9.320: EFS cores / CORA core is located at the focus of the innermost recurving ridge line of a ridge pattern: ifthe ridge is viewed as a section of a circle, the core is the center of that circle; if the ridgeis viewed as an ellipse or parabola, the core is the focal point of that curve. Note that thecore is not on the innermost recurving ridgeline itself.The direction of the core is away from the center of the curve. The core or cores of afingerprint are defined for all pattern classifications other than plain arches, as shown inTable 39. Cores may be marked on tented arches if an innermost recurving ridge ispresent above the delta, so that each side of the recurving ridge extends to either side ofthe delta. Plain or central pocket loop whorls will only have one core if the innermostrecurving ridge is circular, or two cores if elliptical. A circular whorl only has one coreand does not have a defined direction. Accidentals may have any number of cores.If one or more cores are present and the feature set is from a fingerprint, Field 9.307:EFS pattern classification / PAT should be defined. Note that this does not mean thatMay, 2013 DRAFT VERSION UPDATE 2013 Page 155