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

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

biometrics.nist.gov
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12.07.2015 Views

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationmultiple data entries, with polygons to indicate the locations. This field containsthe following three information items:• The first information item (Position code / EPN) contains the codenumber corresponding to the known or most probable position shall betaken and entered as a one- or two-character ASCII subfieldThe second information item (Finger segment / FSM) is optional and onlyapplies to fingerprints in which all or part of the medial or proximal segments(lower joints) are present in the image, in which case the 3-character code fromTable 17 is used to indicate the finger segment position. This information itemdefaults to DST: if the Position Code indicates a fingerprint and the FingerSegment is not specified, the impression shall be regarded as including solelythe distal segment with no substantive portions of the medial or proximalsegments. See Figure 8 for more information, andFigure 9 for examples. This information item shall be omitted if the Position Codeindicates a palm or foot.The third information item (Off-center fingerprint / OCF) is optional and onlyapplies to fingerprints in which the impression does not contain the central areaof the fingerprint (i.e. the core or a center point of reference), in which case the 1-character code fromTable 18 is used to indicate the off-center position of the fingerprint image.Figure 11 shows examples of off-center fingerprint positions. Thisinformation item shall be omitted if the Position Code indicates a palm orfoot.The fourth information item (Polygon / PYG) is a closed path that delineates theportion of the region of interest corresponding to the Position Code/FingerSegment codes. See• Figure 9 and Figure 10 for examples. If the bounding box is not defined,the Position Code/Finger Segment codes are assumed to apply to theentire region of interest.Table 17:Finger segment codes68DRAFT 2

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationName Code DescriptionDistal Segment DST The segment of the finger or thumb farthest from the palm (default)Medial SegmentMEDThe middle segment of the finger (the thumb does not have a medialsegment)Proximal Segment PRX The segment of the finger or thumb closest to the palmUnknownSegmentUNKImage is an unknown segment of a finger or thumb.Table 18:Off-center fingerprint positionsName Code DescriptionTip T The plain or rolled tip of the imageRightSideRThe right side of the finger or thumbLeft Side L The left side of the finger or thumb69DRAFT 2

<strong>ANSI</strong>/<strong>NIST</strong>-<strong>ITL</strong> 1-<strong>2011</strong>Data Format for the Interchange of Biometric and Forensic InformationName Code DescriptionDistal Segment DST The segment of the finger or thumb farthest from the palm (default)Medial SegmentMEDThe middle segment of the finger (the thumb does not have a medialsegment)Proximal Segment PRX The segment of the finger or thumb closest to the palmUnknownSegmentUNK<strong>Image</strong> is an unknown segment of a finger or thumb.Table 18:Off-center fingerprint positionsName Code DescriptionTip T The plain or rolled tip of the imageRightSideRThe right side of the finger or thumbLeft Side L The left side of the finger or thumb69DRAFT 2

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