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 Information17.1 Field 13.001 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.17.2 Field 13.002 Image designation character / IDCThis mandatory field shall be the IDC of the Type-13 record as found in the filecontent (CNT) field of the Type-1 record.17.3 Field 13.003 Impression type / IMPThis mandatory field shall be a latent code selected from Table 8, describing themanner by which the friction ridge image information was obtained. The longname is reflective of the fact that originally this field only applied to Fingerprintimages.17.4 Field 13.004: Source agency / ORI / SRCThis mandatory ASCII field shall contain the identification of the administration ororganization that originally captured the latent 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.17.4.1 Field 13.005: Latent capture date / LCDThis mandatory ASCII field shall contain the date that the latent image containedin the 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.17.4.2 Field 13.006: Horizontal line length / HLLThis mandatory ASCII field shall contain the number of pixels contained on asingle horizontal line of the transmitted image.17.4.3 Field 13.007: Vertical line length / VLLThis mandatory ASCII field shall contain the number of horizontal lines containedin the transmitted image.17.4.4 Field 13.008: 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, or172DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationa "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.17.4.5 Field 13.009: 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.17.4.6 Field 13.010: 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.17.4.7 Field 13.011: Compression algorithm / CGAThis mandatory ASCII field shall specify the algorithm used to compress thetransmitted grayscale images. An entry of "NONE" in this field indicates that thedata contained in this record is uncompressed. For those images that are to belosslessly compressed, this field shall contain the code from Table 2 to indicatethe compression method used for the latent fingerprint images. See Section5.6.1. for additional information on the usage of JPEG 2000 for the compressionof fingerprint images. The domain registrar shall maintain a registry ofacceptable compression techniques and corresponding codes that may be usedas they become available. Note: The best practice for latent prints is nocompression or lossless compression.17.4.8 Field 13.012: 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 precision.17.4.9 Field 13.013: Friction ridge generalized position / FGPThis mandatory field shall contain one or more possible finger, plantar or palmpositions that may be the source of the latent image. The decimal code numbercorresponding to the known or most probable friction ridge position shall be takenfrom Table 9 and entered as a one- or two-character ASCII subfield. Additionalfriction ridge positions may be entered. The code "0", for "Unknown Finger", shallbe used to reference every finger position from one through ten. Code "19" shallbe used to reference one or more parts of an EJI or tip. The code “20”, for“Unknown Palm”, shall be used to reference every listed palmprint position. Thecode “60” for “Unknown Sole,” or code “63” for “Unknown Toe” shall be used toreference every listed plantar position.173DRAFT 2
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