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

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information9.1 Fields for Type-2 recordsThe first two data fields of the Type-2 record are mandatory and defined by thisstandard. The remaining fields of the record(s) shall conform to the format,content, and requirements of the subscribed Domain Name (DOM) used by theagency to which the transmission is being sent.9.1.1 Field 2.001: Record headerThe content of this field depends upon the encoding chosen. Seewww.biometrics.nist.gov/standard for the content of this field for the encodingused. In Traditional encoding, the content is the length of the record. In NIEMconformantencoding it is the record type-number.9.1.2 Field 2.002: Image designation character / IDCThis mandatory field shall be the IDC of the Type-2 record as found in the filecontent (CNT) field of the Type-1 record.9.1.3 Field 2.003 and above: User-defined fieldsIndividual fields required for given transaction types, including field size andcontent, shall conform to the specifications set forth by the agency to which thetransmission is being sent.10 Type-4 fingerprint image recordsThe Type-4 record is based on the use of a captured fingerprint image obtainedusing a scanning resolution that is at least as great as the minimal scanningresolution of 19.69 ppmm (500 ppi) and transmitted between 500 ppi and 520ppi. Users are encouraged not to utilize Type-4 records, and are encouraged toutilize Type-14 records.Record Type-4 does not contain fields for image hash, original image referencevalue, or geographic collection reference since the Traditional encoding for thisrecord type is fixed in length and order.Brad Wing 6/19/10 5:07 PMComment: See section on transmissionresolutionMnemonic Condcode*Field Characternumber TypeTable 7 Type 4 record dataField nameOccur countMinMaxM 4.001 RECORD HEADER 1 1IDC M 4.002 N IMAGE DESIGNATION CHARACTER 1 1IMP M 4.003 N IMPRESSION TYPE 1 128DRAFT 2