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 Information17.4.10 Field 13.014: Search position descriptors / SPDThis shall be present if and only if the finger position code "19" appears in Field13.013. It is used to narrow the search of the latent image in this record againsta database. This field shall consist of two mandatory information items.The first information (probable decimal finger position code / FGP) (0-10)is taken from Table 9. A "0" indicates that all the fingers of a possiblecandidate should be searched.The second information item (Entire joint image - EJI or tip image / SLC) isthe code taken fromTable 67 to indicate the portion of the in the database to search. Latentimages of full-length fingers use codes FV1 through FV4 as defined inTable 67. Figure 31 is an illustration of the Entire Joint Image for a middlefinger with each of the full finger views and constituent parts identified. TheEJI code is used for the case where all four finger images are to beconsidered. For the case where the latent is to be compared to proximal,distal, or medial segments of a finger, this information item will contain theappropriate finger segment character. Multiple portions of the EJI can belisted.Table 67 EJI and tip codesTYPE OF IMAGEEntire Joint ImageRolled TipFull Finger Rolled ImageFull Finger Plain Image – left sideFull Finger Plain Image – centerFull Finger Plain Image – right sideProximal, Distal, or Medial SegmentsIMAGE CODEEJITIPFV1FV2FV3FV4PRX, DST, MEDNOTE: Fields 13.014 and 13.015 are included to make the standard flexibleenough to accommodate many different scenarios and applications. These twofields facilitate searching of latents formatted within Type-13 records againstType-14 records contained in the various databases. The search of a databaseby a latent can be narrowed with the use of additional information such as fingerposition, finger segment, or full finger view. It is unlikely that an entire EJI willever be left at the scene of a crime. But a latent can be searched against the174DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationEJIs based on a specific finger segment or full finger view. This can beaccomplished for a portion of the latent described by the X and Y coordinates.17.4.11 Field 13.015: Print position coordinates / PPCIf finger position code “19” appears in field 13.013, this field contains offsets tothe locations for the bounding box of the EJI, each of the full finger views, orsegments within the EJI. When used, this field shall consist of six (6) mandatoryinformation items to describe the type or portion of the latent image contained inthis record and its location within an entire joint image.This information will describe either the location of the entire joint image, one fullfinger view, or segment. Individual full finger or segment definitions may berepeated as subfieldsThe first information item is the number of the full finger view / FVC withvalues of "FV1" through "FV4". Values of “FV1” to “FV4” specify the boundingcoordinates for each full finger view. For the case of a fingertip, the firstinformation item shall be “TIP”The second information item is used to identify the location of a segment /SLC within a full finger view. It will contain the not applicable code “NA” if theimage portion refers to a full finger view, tip or to the entire joint imagelocations. It shall contain “PRX”, “DST”, “MED” for a proximal, distal, ormedial segmentThe third information item is the left horizontal coordinate value / LHC. It isthe horizontal offset in pixels to the right relative to the origin positioned in theupper left corner of the image.The fourth information item is the right horizontal coordinate value / RHC. It isthe horizontal offset in pixels to the right relative to the origin positioned in theupper left corner of the image.The fifth information item is the top vertical coordinate value / TVC is thevertical offset (pixel counts down) to the top of the bounding box.The sixth information item is the bottom vertical coordinate value / BVC. It isthe vertical offset from the upper left corner of the image down to the bottomof the bounding box. It is counted in pixelsBrad Wing 6/21/10 8:33 AMComment: Reorganized for clarity.175DRAFT 2
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