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

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationCodeLUDescriptionImage is known to be laterally reversed.Image may be laterally reversed13.7.22 EFS Field 9.316 Friction Ridge Quality Metric / FQMThis optional field is used to specify one or more different metrics of friction ridgequality for the friction ridge impression corresponding to this record, as delimitedby the region of interest. The meaning attributed to this metric must be definedand interpreted by the producer of the scoring algorithm or by the person orsystem used to assign the metric to the image. The metric may be a predictor ofAFIS matcher accuracy performance or a different metric to indicate a valueassociated with the quality of the image for a particular function.If the corresponding image is present in the file with this Type-9 record, this fieldcorresponds to fields 13.024, 14.024, and 15.024, but differs in that the qualitymetric is limited to the area in the image delimited by the region of interest.This field identifies a quality score and the algorithm used to create the qualityscore. This information is useful to enable the recipient of the quality score todifferentiate between quality scores generated by different algorithms and adjustfor any differences in processing or analysis as necessary.This field consists of three information items:83• The first information item (Quality metric value / QMV) shall be aquantitative expression of the quality of the biometric sample. This itemcontains the ASCII representation of the integer friction ridge quality scorebetween 0 and 100 assigned to the data by a quality algorithm. Highervalues indicate better quality. An entry of “255” shall indicate a failedattempt to calculate a quality score. An entry of “254” shall indicate that noattempt to calculate a quality score was made. The use of additionalvalues to convey other information should be harmonized with ISO/IEC19794 standards.• The second information item (Quality algorithm vendor code / QAV)shall specify the integer value that is the ID of the vendor of the qualityalgorithm used to calculate the quality score. The IBIA shall maintain theVendor Registry of CBEFF Biometric Organizations that will map the valuein this field to a registered organization.• The third information item (Quality algorithm product code / QPC) shallspecify a numeric product code assigned by the vendor of the qualityalgorithm, which may be registered with the IBIA, but registration is notrequired. It indicates which of the vendor’s algorithms was used in theDRAFT 2