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 Information3. Note that when this field is set to 2 or 3, all of the Record Type-20 instances inthat group shall have the same IDC in Field 20.002.24.4 Field 20.004: Source agency / ORI / SRCThis optional 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.24.5 Field 20.005: Image date / IMDThis optional 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.24.6 Field 20.006: Horizontal line length / HLLThis optional ASCII field shall contain the number of pixels contained on a singlehorizontal line of the transmitted image.24.7 Field 20.007: Vertical line length / VLLThis optional ASCII field shall contain the number of horizontal lines contained inthe transmitted image.24.8 Field 20.008: Scale units / SLCThis optional ASCII field shall specify the units used to describe the imagesampling frequency (pixel density). A "1" in this field indicates pixels per inch, ora "2" indicates pixels per centimeter. A "0" in this field indicates no scale isgiven. For this case, the quotient of HPS/VPS gives the pixel aspect ratio.24.9 Field 20.009: Horizontal pixel scale / HPSThis optional ASCII field shall specify the integer pixel density used in thehorizontal direction of the transmitted image providing the SLC contains a "1" ora "2". Otherwise, it indicates the horizontal component of the pixel aspect ratio.24.10 Field 20.010: Vertical pixel scale / VPSThis optional ASCII 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.24.11 Field 20.011: Image format / IFTThis mandatory ASCII field shall contain an entry from Table 2 to specify thealgorithm used for compressing the color or grayscale single-frame image. Anentry of "NONE" in this field indicates that the data contained in this record isuncompressed.Brad Wing 6/22/10 4:51 PMComment: Revised246DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationFor video inputs, the format of the video is entered using codes from Table 89.If the video type is not in the table below, enter the video type specified in theuser manual of the device that was used to capture the image.Table 89 Video CodesVideo TypeMPEG-1MPEG-2MPEG-4VC-1VHSVHS-CDVDBlu-rayOgg-TheoraUnknownASCII CodeMPEG1MPEG2MPEG4VC1VHSVHSCDVDBLUOGGUNKFor other types of inputs (such as presentation formats), enter the standard suffixto the file type name that indicates the file type (e.g. PDF).24.12 Field 20.012: Bits per pixel / BPXThis optional ASCII field shall contain the number of bits used to represent apixel for a non-video image. This field shall contain an entry of “8” for normalgrayscale values of “0” to “255”. Any entry in this field greater than “8” shallrepresent a grayscale pixel with increased precision.24.13 Field 20.013: Color space / CSPThis optional ASCII field shall contain an entry from Table 1 to identify the colorspace used to exchange the image data. If the color space for an RGB imagecannot be determined, an entry of "RGB" shall be entered.For JPEG-compressed color images (stored using the JFIF format), the preferred(external) color space is sRGB and an entry of “SRGB” shall be used. For allgrayscale (monochrome) images, an entry of "GRAY" shall be used.247DRAFT 2
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