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

47ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information13.6.9 Field 9.134: 19794-2 Finger position / FPZThis mandatory field shall contain the code designating the finger position thatproduced the information in this Type-9 record. A code between 1 and 10 takenfrom Table 9 shall be used to indicate the finger position.13.6.10 Field 9.135: 19794-2 Finger Quality Data / FQDThis mandatory field shall contain the quality of the overall finger minutiae data.There may be multiple subfields (Finger Quality Value / FQV) for each algorithmand predictive performance measure. Each subfield shall contain threeinformation items.* The first information item (predicted matching performance /PMP) of the biometric sample contains the ASCII representation of the integerimage quality score between 0 and 100 assigned to the image data by a qualityalgorithm. Higher values indicate better quality. An entry of “255” shall indicate afailed attempt to calculate a quality score. An entry of “254” shall indicate that noattempt to calculate a quality score was made. The use of additional values toconvey other information should be harmonized with ISO/IEC 19794 standards.* The second information item (vendor ID / QVI) is a 4-digit hexvalue is assigned by IBIA and expressed as four ASCII characters. The IBIAshall maintain the Vendor Registry of CBEFF Biometric Organizations that willmap the value in this field to a registered organization.* The third information item (numeric product code / NPC) isassigned by the vendor of the quality algorithm, which may be registered with theIBIA, but it is not required to be registered. It indicates which of the vendor’salgorithms was used in the calculation of the quality score. This field contains theASCII representation of the integer product code and should be within the range1 to 65535.13.6.11 Field 9.136: 19794-2 Number of Minutiae / NOMThe mandatory field shall contain a count of the number of minutiae recorded inthis data block.13.6.12 Field 9.137: 19794-2 Finger minutiae data / FMDThis mandatory field has six information items, each containing the details for asingle minutia. The total number of minutiae subfields (Finger minutia values /FMV) must agree with the count found in field 136.DRAFT 2• The first information item (minutia index number / MAN),shall be initialized to “1” and incremented by “1” for each additionalminutia in the fingerprint.• The second information item (‘x’ coordinate / MXC) isexpressed in pixel units.