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 Information20.4 Field 16.004: Source agency / ORI / SRCThis mandatory ASCII field shall contain the identification of the administration ororganization that originally captured the image contained in the record. Normally,the Originating Agency Identifier, ORI, of the agency that captured the image willbe contained in this field. The SRC shall be defined by the user and be inaccordance with the receiving agency.20.5 Field 16.005: User-defined testing date / UTDThis mandatory ASCII field shall contain the date that the image contained in therecord was captured. The YYYY characters shall represent the year the imagewas captured; the MM characters shall be the tens and units values of the month;and the DD characters shall be the tens and units values of the day in the month.For example, 20040229 represents February 29, 2004.20.6 Field 16.006: Horizontal line length / HLLThis mandatory field shall contain the number of pixels contained on a singlehorizontal line of the transmitted image.20.7 Field 16.007: Vertical line length / VLLThis mandatory field shall contain the number of horizontal lines contained in thetransmitted image.20.8 Field 16.008: Scale units / SLCThis mandatory field shall specify the units used to describe the image samplingfrequency (pixel density). A "1" in this field indicates pixels per inch, or a "2"indicates pixels per centimeter. A "0" in this field indicates no scale is given. Forthis case, the quotient of HPS/VPS gives the pixel aspect ratio.20.9 Field 16.009: Horizontal pixel scale / HPSThis mandatory field shall specify the integer pixel density used in the horizontaldirection of the transmitted image providing the SLC contains a "1" or a "2".Otherwise, it indicates the horizontal component of the pixel aspect ratio.20.10 Field 16.010: Vertical pixel scale / VPSThis mandatory field shall specify the integer pixel density used in the verticaldirection of the transmitted image providing the SLC contains a "1" or a "2".Otherwise, it indicates the vertical component of the pixel aspect ratio.20.11 Field 16.011: Compression algorithm / CGAThis mandatory field shall contain an entry from Table 2 to specify the algorithmused for compressing the image. An entry of "NONE" in this field indicates thatthe data contained in this record is uncompressed.200DRAFT 2
201ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information20.12 Field 16.012: Bits per pixel / BPXThis mandatory field shall contain the number of bits used to represent a pixel.This field shall contain an entry of “8” for normal grayscale values of “0” to “255”.Any entry in this field greater than “8” shall represent a grayscale pixel withincreased precision.20.13 Field 16.013: Color space / CSPThis optional field shall contain an entry from Table 1 to identify the color spaceused to exchange the image data. If the color space for an RGB image cannotbe determined, an entry of "RGB" shall be entered. The description for field10.012 contains additional information on the color space field.20.14 Field 16.016: Scanned horizontal pixel scale / SHPSThis optional ASCII field shall specify the horizontal pixel density used for thescanning of the original image providing the SLC field contains a "1" or a "2".Otherwise, it indicates the horizontal component of the pixel aspect ratio.20.15 Field 16.017: Scanned vertical pixel scale / SVPSThis optional ASCII field shall specify the vertical pixel density used for thescanning of the original image providing the SLC field contains a "1" or a "2".Otherwise, it indicates the vertical component of the pixel aspect ratio.20.16 Field 16.020: Comment / COMThis optional ASCII field may be used to insert comments or other ASCII textinformation with the image data.21.17 Field 16.024: User-defined testing image quality score/ UQSThis 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 toDRAFT 2
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