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 InformationThe second information item (image quality score / QVU) shall be aquantitative expression of the predicted matching performance of thebiometric sample. This item contains the ASCII representation of the integerbetween 0 and 100 assigned to the image data by a quality algorithm. Highervalues indicate better quality. An entry of “255” shall indicate a failed attemptto calculate a quality score. An entry of “254” shall indicate that no attempt tocalculate a fingerprint image quality score was made. The use of additionalvalues to convey other information should be harmonized with ISO/IEC 19794standardsThe third information item (algorithm vendor identification / QAV) shallspecify the ID of the vendor of the quality algorithm used to calculate thequality score. This 4-digit hex value is assigned by IBIA and expressed asfour ASCII characters. The IBIA shall maintain the Vendor Registry of CBEFFBiometric Organizations that will map the value in this field to a registeredorganization.The fourth information item (algorithm product identification / QAP) shallspecify a numeric product code assigned by the vendor of the qualityalgorithm, which may be registered with the IBIA, but registration is notrequired. QAP indicates which of the vendor’s algorithms was used in thecalculation of the fingerprint image quality score. This field contains the ASCIIrepresentation of the integer product code and should be within the range 1 to65535.23.19 Field 19.030: Device monitoring mode / DMMThis optional field provides information describing the level of human monitoringfor the image capture device. This field will contain an entry from Table 56 toindicate the monitoring mode of the biometric sample capture device.23.20 Fields 19.200-990: User-defined fields / UDFThese fields are user-defined fields. Their size and content shall be defined bythe user and be in accordance with the receiving agency. If present, they shallcontain ASCII textual information.23.21 Field 19.996: Image hash / HASThis optional field has the hash value of the image contained in the 999 field ofthis record, hash value shall be calculated using SHA 256.23.22 Field 19.997: Original image reference / OIVThis optional field refers to an image in Record Type-20 with the same OIR. Thisis an optional field and is used when the image transmitted in this record isderived from an original image. This field consists of two subfields.242DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationThe first subfield contains the reference code / OIR for a particular RecordType-20. This is mandatory for each OIV.The second subfield is optional. It specifies the reference to thesegmentation coordinates of the original image that is represented in thisrecord type, which is a reference type value / RTV.23.23 Field 19.998: Geographic sample location / GEOThis optional field is composed of three optional subfields; one of which must bechosen.The first subfield (geographic reference text / GRT) is free form textdescribing a street address or other physical location.The second sufield (degree value / DEG) has the format ±xxx.xxxx±yyy.yyyy,where x refers to latitude and y refers to longitude. For example, +039.1455-077.2057.The third subfield (degree minute second value / DMS) has the format±xxxDxxMxxS±yyyDyyMyyS, where x refers to latitude and y refers tolongitude. For example, +039D08M44S-077D12M20S.23.24 Field 19.999: Image data / DATAThis mandatory field shall contain all of the data from a captured plantar printimage.Each pixel of uncompressed grayscale data shall normally be quantized to eightbits (256 gray levels) contained in a single byte. If the entry in BPX Field 19.012is greater than 8, the number of bytes required to contain a pixel will be different.If compression is used, the pixel data shall be compressed in accordance withthe compression technique specified in the CGA field.24 Type-20 Original image recordThe Type-20 record contains the original image that has been processed topopulate the image Record Types. This record type also allows an organizationto record how original data was processed to provide the image or biometricsample cross-referenced by the OIR (Original Image Reference).MnemonicCondcode*FieldnumberCharacterTypeTable 88 Type-20 RecordField nameMinOccur countMaxBrad Wing 6/22/10 5:18 PMComment: Table now included in recorddescription; with subfields and information items243DRAFT 2
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