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

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208ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationrecord is the subject’s right eye. An entry of “2” in this field indicates that theimage in this record is the subject’s left eye.21.4 Field 17.004: Source agency / ORI / SRCThis mandatory ASCII field shall contain the identification of the administration ororganization that originally captured the iris image contained in the record.Normally, the Originating Agency Identifier, ORI, of the agency that captured theimage will be contained in this field. The SRC shall be defined by the user andbe in accordance with the receiving agency.21.5 Field 17.005: Iris capture date / ICDThis mandatory ASCII field shall contain the date that the iris image contained inthe record was captured. See the relevant Annex in this standard for the exactencoding format for this data. The YYYY characters shall represent the year theimage was captured; the MM characters shall be the tens and units values of themonth; and the DD characters shall be the tens and units values of the day in themonth.21.6 Field 17.006: Horizontal line length / HLLThis mandatory ASCII field shall contain the number of pixels contained on asingle horizontal line of the transmitted image.21.7 Field 17.007: Vertical line length / VLLThis mandatory ASCII field shall contain the number of horizontal lines containedin the transmitted image.21.8 Field 17.008: Scale units / SLCThis mandatory 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.21.9 Field 17.009: Horizontal pixel scale / HPSThis mandatory 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.21.10 Field 17.010: Vertical pixel scale / VPSThis mandatory ASCII field shall specify the integer pixel density used in thevertical direction of the transmitted image providing the SLC contains a "1" or a"2". Otherwise, it indicates the vertical component of the pixel aspect ratio.21.11 Field 17.011: Compression algorithm / CGAThis mandatory ASCII field shall specify the algorithm used to compress thetransmitted color or grayscale images. Table 2 contains the codes for theDRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationcompression methods. An entry of “NONE” in this field indicates that the datacontained in this record is uncompressed. The image shall be represented as anarray of n rows by m columns by at least 8-bit pixels. Each pixel in amonochrome image shall be represented by eight or more bits. Color imagesshall be represented as a sequential sample of a red, green, and blue intensityfor each pixel. The image shall be organized in row-major order, with the lowestaddress corresponding to the upper left corner of the image.For those images that are to be compressed, the method of compression of irisimages is specified by the baseline mode of the JPEG algorithm or JPEG 2000.21.12 Field 17.012: Bits per pixel / BPXThis mandatory ASCII field shall contain the number of bits used to represent apixel. 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 pixelwith increased quantization.21.13 Field 17.013: Color space / CSPThis mandatory ASCII field shall contain an entry from Table 1 to identify thecolor space used to exchange the image data. If the color space for an RGBimage cannot be determined, an entry of "RGB" shall be entered in field 17.013.The description for field 10.012 contains additional information on the color spacefield.21.14 Field 17.014: Rotation angle of eye / RAEThis optional field shall indicate the rotation angle of the eye. For rectilinearimages, rotation angle = round (65536 * angle / 360) modulo 65536. The angle ismeasured in degrees from horizontal to the inter-pupillary line. The value “FFFF”indicates rotation angle of eye is undefined.21.15 Field 17.015: Rotation uncertainty / RAUThis optional field shall indicate the rotation uncertainty. The rotation uncertaintyis equal to [round (65536 * uncertainty / 180)]. The uncertainty is measured indegrees and is the absolute value of maximum error. The value “FFFF” indicatesuncertainty is undefined.21.16 Field 17.016: Image property code / IPCThis optional field shall contain the image property code. It shall contain threeinformation items.The first information item is the horizontal orientation code / IHO. Values forHorizontal Orientation shall be one of: “0” for Undefined, “1” for Base, or “2”for Flipped. “Base” orientation refers to images corresponding to the viewfacing the subject, where the nasal side of subject’s left eye or outer edge ofthe subject’s right eye is on the left side the of image. “Flipped” orientationBrad Wing 6/21/10 1:35 PMComment: Reorganized for clarity209DRAFT 2
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