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 InformationVoice‘00000004'Fingerprint‘00000008'Iris‘00000010'Retina‘00000020'Hand Geometry‘00000040'Signature Dynamics‘00000080'Keystroke Dynamics‘00000100'Lip Movement‘00000200'Thermal Face Image‘00000400'Thermal Hand Image‘00000800'Gait‘00001000'Body Odor‘00002000'DNA‘00004000'Ear Shape‘00008000'Finger Geometry‘00010000'Palmprint‘00020000'Vein Pattern‘00040000'Foot Print ‘00080000’26.3.4 Field 99.102: Biometric data quality / BDQThis optional ASCII field is used to specify a quality score for the biometric datastored in the BDB in this record. This field may contain one or more subfields,each consisting of four information items. This subfield (Quality Metric Subfield/ QMS) is repeated for each plantar image and quality algorithm used.The first information item (image quality score / QVU) shall be a quantitativeexpression of the predicted matching performance of the biometric sample.This item contains the ASCII representation of the integer between 0 and 100assigned to the image data by a quality algorithm. Higher values indicatebetter quality. An entry of “255” shall indicate a failed attempt to calculate aquality score. An entry of “254” shall indicate that no attempt to calculate afingerprint image quality score was made. The use of additional values toconvey other information should be harmonized with ISO/IEC 19794standardsThe second 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 third 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 not256DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationrequired. 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 to65535.26.3.5 Field 99.103: BDB format owner / BFOThis mandatory ASCII field shall be used to denote the vendor, standards body,working group, or industry consortium that has defined the format of the biometricdata (in the BDB). In a CBEFF structure the BDB Format Owner and FormatType, when used in combination, uniquely identify the specific format of the BDBcontent. The format and content of the BDB is “owned” by the CBEFF Client(see Clause 6.1 of the CBEFF standard). This BDB format definition may bepublished (public) or unpublished (non-public).A CBEFF requirement is that format owners register with IBIA for an assignedidentifier of the format owner. The number is guaranteed to be unique. Refer tothe CBEFF standard, Clause 6, “CBEFF Patrons and Clients,” for registrationinformation.The four hex digits assigned by IBIA shall be represented by a string of fourASCII characters.26.3.6 Field 99.104: BDB format type / BFTThis mandatory ASCII field shall be used to identify the value assigned by theformat owner to represent the specific BDB Format as specified by the formatowner. This may be a non-standard, unpublished data format or a data formatthat has been standardized by an industry group, consortium, or standards body.The registration of the Format Type value is recommended but not required.Refer to the CBEFF standard, Clause 6, “CBEFF Patrons and Clients,” forregistration information.The four hex digits assigned by the format owner shall be represented by a stringof four ASCII characters.26.3.7 Field 99.200-990: User-defined fields / UDFThese fields are user-definable 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.26.4 Field 99.996: BDB hash / HASThe BDB hash value shall be calculated using SHA 256.257DRAFT 2
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