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

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationcalculation of the quality score. This field contains the ASCIIrepresentation of the integer product code and should be within the range1 to 65535.13.7.23 EFS Field 9.317 Possible growth or shrinkage / PGSThis optional field is only used in the unusual circumstance that the friction ridgeimpression is believed to have changed size or scale from potential comparisons.This provides for handling of images from deceased subjects with desiccatedskin, or with swollen skin due to water exposure. This also provides for handlingof overall growth of subjects between capture, such as in comparing an adult’sfingerprints with those taken as a child. In these cases the size of ridges anddistances between ridges change to a greater extent than would ordinarily beassumed in comparisons; this field acts as a flag to indicate that greater thanordinary dimensional variation should be expected in performing subsequentcomparisons.This field is to be omitted unless there is reason to believe that growth orshrinkage may have occurred. This field consists of two information items:• The first information item (Type / TGS) is selected from Table 25.• The second information item (Comment / COM) contains optional textdescribing the rationale for believing that growth or shrinkage may haveoccurred.Table 25: Growth or shrinkage codesCodeGSBDescriptionGrowth: impression is believed to be dimensionallylarger than exemplars or other prints from the samesubject.Shrinkage: impression is believed to bedimensionally smaller than exemplars or otherprints from the same subject.Both: impression may be dimensionally larger orsmaller than exemplars or other prints from thesame subject.84DRAFT 2