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

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ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONTable 34 Ridge quality map data representation format optionsType Code DescriptionUncompressed(concatenateddecimal)UNCThe values for each grid cell in the Ridge Quality Map field are single-character integers as definedin Table 33, with one character per cell. All quality values for one row are concatenated left to right,with one repeating subfield of Field 9.308: EFS ridge quality/confidence map / RQM for each row.The number of characters in one repeating subfield of Field 9.308 is the same as the number of cellsin one row: the Region of Interest’s width divided by the Grid Size, rounded up to the nearest integer.Run-LengthEncodedRLEThe unencoded values for each entry are identical to those used in UNC format. The numeric valuesfor each grid cell (0-5) are then replaced with alphabetic equivalents (A-F), and then any sequentialruns of the same character are prefixed by the decimal count of repeated characters. Individualcharacters are not preceded by a count.For example:00000000000000000000000000000000000000000000000000 (50 characters)Is saved as “50A”0000000000001122334555555444442210000000000000000 (50 characters)Is saved as “12A2B2C2DE6F5E2CB16A” (20 characters)8.9.7.8 Field 9.310: EFS ridge flow map / RFMThis optional field contains the direction of friction ridges at sampling points throughoutthe region of interest. The sampling frequency is optionally defined in Field 9.311: EFSridge flow map format / RFF, and otherwise defaults to 0.41 mm in uncompressedformat. The first sampling point in the image is the top left-most point in the region ofinterest. The same sampling frequency is used both horizontally and vertically. Valuesshall be included for all sampling points in the region of interest, even if the samplingpoints are at the edge of the region of interest. For each sampling point, angles shall bereported in integer degrees, with 0 degrees to the right (horizontal), increasingcounterclockwise to a maximum value of 179° (since 180°=0°). Undefined angles arerecorded in Field 9.311: EFS ridge flow map format / RFF. Each subfield correspondsto one row of the map in order from top to bottom.The area used for determining direction (window size) may be larger or smaller than thesampling frequency. Different window sizes may be used within a single image, at thediscretion of the implementer. For example, an implementer may choose to use a uniformwindow size except in areas of high curvature, in which a smaller window size may be used.May, 2013 DRAFT VERSION UPDATE 2013 Page 151
ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION8.9.7.9 Field 9.311: EFS ridge flow map format / RFFThis optional field permits setting the sampling frequency or data representation formatused in the Field 9.310: EFS ridge flow map / RFM to values other than the defaults. Itsuse is conditional on the presence of Field 9.310. This field consists of two informationitems:• The first information item (sampling frequency / SFQ) is set by default to0.41mm (0.016”). This information item may be used to define higherresolution sampling frequencies than the default: valid settings range from“1” (0.01mm) through “41” (0.41mm).• The second information item (data format / RDF) defines the format usedin the Ridge Flow Map field, as defined in Table 35. The default is theuncompressed (“UNC”) format.Table 35 Ridge flow map data representation format optionsType Code DescriptionUncompressed(concatenatedhexadecimal)base-64UNCB64Each ridge flow value is a 2-character hexadecimal value. The angles are stored in 2-character hexadecimal representation with leading zeros, so valid values range from “00”(0dec) to “B3” (179dec). Undefined angles: If the direction cannot be determined at a givenlocation, the location at that point shall be marked as “XX”. All of the ridge flow values for agiven row shall be concatenated in order left to right and saved as a separate instance /repeating subfield of Field 9.310: EFS ridge flow map / RFM.The number of characters in one repeating subfield of Field 9.310 is twice the number ofcells in one row.Each ridge flow value is a 1-character base-64 value. The angles are divided by three toenable storing in a single base-64 character, which has the effect of quantizing to threedegrees. Undefined angles: If the direction cannot be determined at a given location, thelocation at that point shall be marked as “*” (asterisk). All of the ridge flow values for agiven row shall be concatenated in order left to right and saved as a separate instance /repeating subfield of Field 9.310.The number of characters in one instance of Field 9.310: EFS ridge flow map / RFM is thenumber of cells in one row.8.9.7.10Field 9.312: EFS ridge wavelength map / RWMThis optional field contains the peak-to-peak distance between ridges at various samplingpoints throughout the region of interest. The sampling frequency is optionally defined inField 9.313: EFS ridge wavelength map format / RWF, and otherwise defaults to 0.41mm in uncompressed format. The first sampling point in the image is the top left-mostpoint. The same sampling frequency is used both horizontally and vertically. Values shallbe included for all sampling points in the image, even if the sampling points are at theedge of the image.152
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NIST Special Publication 500-xxxANS
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5.3.18 Type-18 records ............
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8.1.4 Field 1.004 Type of transacti
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8.9.7.18 Field 9.322: EFS core delt
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8.11 Record Type-11: Forensic and i
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8.14.2 Field 14.002: Information de
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8.17 Record Type-17: Iris image rec
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8.19.24 Field 19.902: Annotation in
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8.24.6 Field 99.101: Biometric type
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F.6.3 Reference points.............
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Figure 34: Palm with carpal delta a
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Table 31 Off-center fingerprint pos
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Table 95 DNA sample cellular types.
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Type-11:A new record type introduce
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ACKNOWLEDGEMENTS FOR ANSI/NIST-ITL
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Will Graves, Rob Mungovan, Catherin
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John ManzoFBI/BIOMETRICS Center ofE
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General Editor: Brad Wing[2013a>]AC
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CANVASSEES For the 2013 UpdateTO BE
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ANSI/NIST-ITL 1-2011 - UPDATE 2013
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