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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONWhen different images of a single finger/palm/plantar are captured, each is given aseparate IDC, to ensure that the minutiae records correspond to a specific imagerecord.• Two or more image records may share a single IDC only when they areenhancements of a single image; such transformations shall have identicaldimensions, and shall not be distorted with respect to each other (i.e., a feature at agiven position in one image shall be in the same position in the other image). Thismeans that if a friction-ridge image is captured at 1000 ppi (saved in Type 13, 14, 15,or 19) and down-sampled to 500 ppi (for transmission in a Type-4 record), then eachwould have different IDCs. Multiple images of a face, encoded in Record Type-10,shall each have a unique IDC. SMT images also each have a unique IDC. In thecase when one is a different image of the same SMT, Field 10.039: Type-10reference number / T10 is used to link those SMT images.Some examples of the use of IDC are:• A criminal arrest transaction that might, for some agencies, include fingerprints,palmprints, and a mugshot would include distinct records with IDCs ranging from“0” to “21”: a Type-1 record, a Type-2 record (IDC 0), 14 Type-14 fingerprintimage records (IDCs 1-14), six Type-15 palmprint records (IDCs 15-20), and aType-10 facial image (IDC 21).• A latent print search transaction, which for some agencies could include two latentimages with minutiae markup, the original source image from which the latent printswere derived, and a crime scene image would include distinct records with IDCsranging from “0” to “4”: a Type-1 record, a Type-2 record (IDC 0), 2 Type-13latent image records (IDCs 1-2), two Type-9 minutiae records (IDCs 1-2, referringto the Type-13 latent image records), a Type-20 source representation image record(IDC 3), and a Type-21 associated context record (IDC 4).• A 'raw' image and the same image stored with WSQ compression would have thesame IDC. Both share the same image dimension and the features would occur atthe same location.New to the 2011 version of the standard, three fields ( Field 9.360: EFS area ofcorrespondence / AOC, Field 9.362: EFS examiner comparison determination / ECDand Field 9.362: EFS examiner comparison determination / ECD ) use IDCs asreferences to define the relationship between two different prints.7.3.1.1 Type-2 Record Cross reference / T2C[2013n>] A new field has been added to Record Types 10, 11, 12, 17 and 22. This is usedto link an instance of a record type to a particular Type-2 record when multiple Type-2records for different individuals may be contained in a single transaction. This is useful,for instance, with a Type-11 record, which may segment out the portions of a recording forMay, 2013 DRAFT VERSION UPDATE 2013 Page 47