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

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ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information13.6.2 Field 9.127: 19794-2 Capture equipment identification / CEI.This mandatory field shall contain two information items.• The first (Appendix F status / AFS) shall contain “APPF” if the equipmentused originally to acquire the image was certified to conform with Appendix F(IAFIS Image Quality Specification, January 29, 1999) of CJIS-RS-0010, theFederal Bureau of Investigation’s Electronic Fingerprint TransmissionSpecification. If the equipment did not conform it will contain the value of“NONE”.o The second information item (Capture Equipment ID / CEI) shall containthe, which is a vendor-assigned product number of the capture equipment. Avalue of “0” indicates that the capture equipment ID is unreported.13.6.3 Field 9.128: 19794-2 Horizontal line length /HLLThis mandatory ASCII field shall contain the number of pixels contained on asingle horizontal line of the transmitted image. The maximum horizontal size islimited to 65,534 pixels.13.6.4 Field 9.129: 19794-2 Vertical line length / VLLThis mandatory ASCII field shall contain the number of horizontal lines containedin the transmitted image. The maximum vertical size is limited to 65,534 pixels.13.6.5 Field 9.130: 19794-2 Scale units / SLCThis mandatory ASCII field shall specify the units used to describe the imagesampling frequency (pixel density). A “1” in this field indicates pixels per inch, ora “2” indicates pixels per centimeter. A “0” in this field indicates no scale is given.For this case, the quotient of HPS/VPS gives the pixel aspect ratio.13.6.6 Field 9.131: 19794-2 Horizontal pixel scale / HPSThis mandatory ASCII field shall specify the integer pixel density used in thehorizontal direction providing the SLC contains a “1” or a “2”. Otherwise, itindicates the horizontal component of the pixel aspect ratio.13.6.7 Field 9.132: 19794-2 Vertical pixel scale / VPSThis mandatory ASCII field shall specify the integer pixel density used in thevertical direction providing the SLC contains a “1” or a “2”. Otherwise, it indicatesthe vertical component of the pixel aspect ratio.13.6.8 Field 9.133: 19794-2 Finger view / FVWThis mandatory field contains the view number of the finger associated with thisrecord’s data. The view number begins with “0” and increments by one to “15”.46DRAFT 2
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.
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