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 InformationFor JPEG 2000 images stored using the JP2 format, the available enumeratedcolor spaces are sRGB, sYCC, and grayscale, to be entered, respectively, as“SRGB”, “SYCC”, and “GRAY”. The preferred (external) color space for colorimages is sRGB. If a photo acquisition device uses another ICC 65 color profile,the acquisition system must convert the image data to one of these enumeratedcolor spaces before the JP2 file may be embedded in a Type 10 record.For uncompressed color images containing non-interleaved red, green, and bluepixels in that order, the preferred color space is sRGB and an entry of “SRGB”shall be used.Note that the field codes do not determine if the image data is JPEG, JPEG2000, or uncompressed color images.24.14 Field 20.014: Sample log / LOGThis field has a subfield (Sample log operation grouping/ SHG) that containsfour information items. The subfield is repeated for each operation. The Log inthis field only applies to the data contained in field 20.999 of this instance of thisrecord type.• The first information item is date / DAT, indicating the date of theparticular operation See the rules for the encoding being used for theexact format of this information item.• The second information item is Description / DSC. This informationitem shall contain a description of the operation. 66Brad Wing 6/22/10 5:15 PMComment: This field has been revised from thefirst draft.24.15 Field 20.016: Original image segment position(s) / SEGThis optional ASCII field is an alternate approach to describing the locations forof images within the original image. This field uses an n-vertex polygon toencompass each finger image segment, where “n” is between 3 and 99. Theorder of the vertices must be in their consecutive order around the perimeter ofthe polygon, either clockwise or counterclockwise. No two vertices may occupythe same location. The polygon side defined by the last subfield and the firstsubfield shall complete the polygon. The polygon must be a simple, plane figurewith no sides crossing and no interior holes.This field shall consist of up three subfields. The field is repeated for eachseparate segmentation.* The first subfield is the reference type value / RTV. This provides aunique index to a segmentation image. When using the OIV field in other recordBrad Wing 6/22/10 5:15 PMComment: This field has been reworked.•65 International Color Consortium (ICC), http://www.color.org/•66 Examples include (but are not limited to) cropping, morphing, re-sampling, lighting enhancement, ageprogression, color adjustment, super-resolution, (re)compression and scanning and transmission log.248DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Informationtypes, this information item value may comprise the second (optional) subfield ofthe OIV field.* The second subfield is (internal file reference pointer text / IPT) it is setto 0 if the original image is a single image file. If the original file in Field 20.999 isa PDF, video, or presentation file, or has multiple locations where an image maybe located, this information item is the reference to the particular instance, suchas page, video frame, or slide number, (contained in the original such as imagedata) used to derive the image transmitted in other record types. If a particularframe is chosen and there is no segmentation needed, the following informationitems are not used.The optional third subfield (Position polygon vertex quantity / VNV) isthe number of vertices encompassing the segmented finger (between 3 and99)The optional fourth subfield is the vertex information (Position polygonvertex / PPV). It is comprised of two information items:The first information item is the (Position horizontal coordinate value /PHV). It is the horizontal pixel offset (x- across) relative to the originpositioned in the upper left corner of the image.The second information item is the (Position vertical coordinate value /PVV). It is the vertical pixel offset (y - down) relative to the origin positionedin the upper left corner of the image.24.16 Field 20.017: Scanned horizontal pixel scale / SHPSThis optional ASCII field shall specify the horizontal pixel density used for thescanning of the original image providing the SLC field contains a "1" or a "2".Otherwise, it indicates the horizontal component of the pixel aspect ratio.24.17 Field 20.018: Scanned vertical pixel scale / SVPSThis optional ASCII field shall specify the vertical pixel density used for thescanning of the original image providing the SLC field contains a "1" or a "2".Otherwise, it indicates the vertical component of the pixel aspect ratio.24.18 Field 20.020: Comment / COMThis optional ASCII field may be used to insert comments or other ASCII textinformation with the image data.24.19 Fields 21.200-990: User-defined fields / UDFThese fields are user-defined fields. Their size and content shall be defined bythe user and be in accordance with the receiving agency. If present they shallcontain ASCII information.249DRAFT 2
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