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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONF.6.7.1 Field 9.361: EFS corresponding points or features / CPF instructions .For each of the images being compared, specific points or features are marked in each ofthe Type-9 records, with correspondence indicated by the use of the same label, each in aseparate data entry (repeating subfield). Labels within a single Type-9 record shall beunique. For example, if a transaction contains one latent and multiple candidateexemplars, a feature labeled “A” in the latent’s Type-9 feature set corresponds with thefeature labeled “A” (if present) in all of the exemplar Type-9 feature sets.Corresponding Points or Features may refer to arbitrary points, or may refer to predefinedfeatures (as noted in Table 54). The features include point features (such as minutiae,dots, or pores), but also may refer to areas (such as distinctive characteristics), lines(incipient ridges or creases), or paths (ridge path segments). Arbitrary points may be usedto indicate characteristics that were not noted during analysis, or to indicate points in anexemplar that was not previously marked up.Figure 12: EFS areas and points of correspondence in rolled exemplar, latent, andplain exemplar imagesEach feature corresponds to a separate subfield, of up to seven information items.• The first information item (label / COL) is a mandatory 1-3 characteralphanumeric label is used to indicate correspondence between CPFs indifferent Type-9 records. The label names may be selected and assigned atthe discretion of the system or the examiner. Labels within a single Type-9record shall be unique. Note that the use of a given label in one Type-9record means that that point or feature corresponds with any or all otherfeatures with the same label in other Type-9 records in the transaction.• The second information item (type of correspondence / TOC) is amandatory 1- or 2-character information item (code) used to indicate the typeof correspondence or non-correspondence, set to the appropriate “Code”182