acknowledgements for ansi/nist-itl 1-2011 - NIST Visual Image ...

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION8.4.1 Field 4.001: Record headerThe content of this mandatory field is dependent upon the encoding used. See therelevant annex of this standard for details. See Section 7.1.8.4.2 Field 4.002: Information designation character / IDCThis mandatory field shall contain the IDC assigned to this Type-4 record as listed in theinformation item IDC for this record in Field 1.003 Transaction content / CNT. SeeSection 7.3.1.8.4.3 Field 4.003: Impression type / IMPThis mandatory field shall indicate the manner by which the fingerprint was obtained.See Section 7.7.4.1 for details.8.4.4 Field 4.004: Friction ridge generalized position / FGPThis mandatory field shall contain the decimal code number corresponding to the fingerposition and shall be taken from Table 8. Only finger numbers 0-15 apply to Type-4 52 .Up to five additional finger positions shall be referenced by entering the alternate fingerpositions using the same format. If fewer than five finger position references are to beused, the unused position references shall be filled with 255 for Traditional format. Sixvalues shall be entered in each record for Traditional format. See Section 7.7.4.2 formore information.If Record Type-4 is used and images are scanned at a step in the migration path greaterthan the class of 500 ppi (effectively 510 ppi) , they shall be subsampled, scaled down, orinterpolated down to produce a class resolution of 500 ppi for transmission. RecordType-4 shall not be used to transmit a fingerprint image at greater than 20.08 ppmm (510ppi) 53 . See Section 7.7.6.2.8.4.5 Field 4.005: Image scanning resolution / ISRThe mandatory ISR field relates to the scanning resolution of this image. Previousversions of this standard stated that 0 in this field represents the 'minimum scanningresolution.' The minimum scanning resolution was defined in ANSI/NIST-ITL 1-2007 as“19.69 ppmm plus or minus 0.20 ppmm (500 ppi plus or minus 5 ppi).” Therefore, if theimage scanning resolution corresponds to the Appendix F certification level (See Table14 Class resolution with defined tolerance), a 0 shall be entered in this field.A value of 1 is entered if the actual scanning resolution (outside of the Appendix Fcertification range) is specified in Field 1.011 Native scanning resolution / NSR.52The 2007 and 2008 versions of this standard restricted the FGP to a range of 0 to 14. Code 15 is includedin this version.53[2013a>] Sentence reworded for clarity. [