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 Informationrefers to images where the orientation is opposite from that described for“Base”.The second information item is the vertical orientation code / IVO. Valuesfor Vertical Orientation shall be one of: “0” for Undefined, “1” for Base, or “2”for Flipped. “Base” orientation refers to images where the superior (top) edgeof the eye is at the top of the image. “Flipped” orientation refers to imageswhere the orientation is opposite from that described for “Base”.The third information item is the specific scan type / IST. Values for ScanType shall be one of: “0” for Undefined, “1” for Progressive, “2” for InterlaceFrame, or “3” for Interlace Field. “Progressive” indicates that the image wascaptured using progressive scanning, in which case all image lines aregenerated sequentially. “Interlace Frame” indicates that the image wascaptured using interlaced scanning, in which two fields are generated insequence, the first composed of odd-numbered lines and the second of evennumberedlines. “Interlace Field” indicates that the image was captured usinginterlaced scanning, in which only one field is generated, and then each line isduplicated to produce a full size image.21.17 Field 17.017: Device unique identifier / DUIThis optional field shall contain a sixteen-byte string uniquely identifying thedevice or source of the data. This data can be one of: (1) Device Serial number,identified by the first character “D”, (2) Host PC Mac address, identified by thefirst character “M”, (3) Host PC processor ID, identified by the first character “P”,and (4) No serial number, identified by all zero’s.21.18 Field 17.018: Global unique identifier / GUIThis optional field shall contain a 16-byte string to indicate a GUID – a globallyunique identifier.21.19 Field 17.019: Make/Model/Serial Number / MAK / MOD / SERThis optional field contains the make, model and serial number for the iriscapture device. It shall consist of three information items. Each information itemshall be 1 to 50 characters. Any or all information items may indicate thatinformation is unknown with the value “0”.21.20 Field 17.020: Eye color / ECLThis optional field shall specify the subject's eye color. When used, this fieldshall contain an entry chosen from210DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationTable 51.21.21 Field 17.021: Comment / COMThis optional field may be used to insert comments or other ASCII textinformation with the iris image data.21.22 Field 17.022: Scanned horizontal pixel scale / SHPSThis optional ASCII field shall specify the horizontal pixel density used forscanning providing the SLC field contains a "1" or a "2". Otherwise, it indicatesthe horizontal component of the pixel aspect ratio.21.23 Field 17.023: Scanned vertical pixel scale / SVPSThis optional ASCII field shall specify the vertical pixel density used for scanningproviding the SLC field contains a "1" or a "2". Otherwise, it indicates the verticalcomponent of the pixel aspect ratio.21.24 Field 17.024: Image Quality Score / IQSThis optional ASCII field is used to specify one or more different metrics of imagequality score data for the image stored in this record. The meaning attributed tothis metric must be defined and interpreted by the producer of the scoringalgorithm or by the person or system used to assign the metric to the image. Themetric may be a predictor of AFIS matcher accuracy performance or a differentmetric to indicate a value associated with the quality of the image for a particularfunction.This field may contain one or more subfields, each consisting of three informationitems. This subfield (Quality Metric Subfield / QMS) is repeated for each imageand 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.211DRAFT 2
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