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 ...
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information• The third information item (‘y’ coordinate / MYC) isexpressed in pixel units.• The fourth information item (minutia angle / MAV) isrecorded in units of two degrees. This value shall be nonnegativebetween 0 and 179.• The fifth information (minutia type / MTY) has a value of “0”to represent a minutiae of type “OTHER”, a value of “1” for a ridgeending and a value of “2” for a ridge bifurcation.• The sixth information item (quality of minutia / QOM) shallrange from 1 as a minimum to 100 as a maximum. A value of “0”indicates that no quality value is available.13.6.13 Field 9.138: 19794-2 Ridge count information / RCIThis field shall consist of a series of subfields.The first subfield (ridge count method / RCM) has three information items:• The first information item (ridge count extractionmethod / REM) may have a value of 0,1 or 2. A “0” indicates thatno assumption shall be made about the method used to extractridge counts, nor their order in the record. A “1” indicates that foreach center minutiae, ridge count data was extracted to the nearestneighboring minutiae in four quadrants, and ridge counts for eachcenter minutia are listed together. A “2” indicates that for eachcenter minutiae, ridge count data was extracted to the nearestneighboring minutiae in eight octants, and ridge counts for eachcenter minutia are listed together.• The remaining two information items (Filler 1 / FI1and Filler 2 / FI2) of this first subfield shall each contain “0”.Subsequent subfields (ridge count data / RCD) have three information itemseach.• The first information item (center minutia index /CMI) is a number• The second information item (neighboring minutiaindex / NMN) is a number, and• The third information (number of ridges crossed /NRC) is a number.48DRAFT 2
ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic Information13.6.14 Field 9.139: 19794-2 Core information / CINThis field will consist of one subfield (core data / COD) for each core present inthe original image. Each subfield consists of three information items.• The first item (‘x’ coordinate / XCO) is in pixel units.• The second item (‘y’ coordinate / YCO) is in pixel units.• The third information item (angle of the core / AOC) isrecorded in units of 2 degrees. The value shall be a nonnegativevalue between 0 and 179.13.6.15 Field 9.140: 19794-2 Delta information / DINThis field will consist of one subfield (delta data / DED) for each delta present inthe original image. Each subfield consists of three information items.• The first item (‘x’ coordinate / XCD) is in pixel units.• The second item (‘y’ coordinate / YCD) is in pixel units.• The third information item (angle of the delta / AOD) isrecorded in units of 2 degrees. The value shall be a nonnegativevalue between 0 and 179.13.6.16 Fields 9.151 – 9.175 Registered vendor minutiae fieldsSee Table 12 for the vendor names. The vendors define these fields.13.7 Fields 9.300 – 9.398 Extended feature set fieldsThis data block defines the content, format, and units of measurement for thedefinition and/or exchange of friction ridge feature information that may be usedin the identification of a subject based on fingerprint or palmprint imageinformation. This information is intended for an individual examiner to define thecontent of a single impression or comparison of two impressions, as well as forinterchange between criminal justice administrations or organizations that usefingerprints or palmprints for identification purposes.The purpose of this specification is to define a quantifiable, repeatable, and clearmethod of characterizing the information content of a fingerprint or other frictionridge image.13.7.1 Field 9139: EFS Coordinate systemThe relative position of all Extended Friction Ridge Features shall be expressedas positive integers in units of 10 micrometers (0.01 mm or 0.00039 in), with the49DRAFT 2
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<strong>ANSI</strong>/<strong>NIST</strong>-<strong>ITL</strong> 1-<strong>2011</strong>Data Format for the Interchange of Biometric and Forensic Information13.6.14 Field 9.139: 19794-2 Core information / CINThis field will consist of one subfield (core data / COD) for each core present inthe original image. Each subfield consists of three information items.• The first item (‘x’ coordinate / XCO) is in pixel units.• The second item (‘y’ coordinate / YCO) is in pixel units.• The third information item (angle of the core / AOC) isrecorded in units of 2 degrees. The value shall be a nonnegativevalue between 0 and 179.13.6.15 Field 9.140: 19794-2 Delta information / DINThis field will consist of one subfield (delta data / DED) for each delta present inthe original image. Each subfield consists of three information items.• The first item (‘x’ coordinate / XCD) is in pixel units.• The second item (‘y’ coordinate / YCD) is in pixel units.• The third information item (angle of the delta / AOD) isrecorded in units of 2 degrees. The value shall be a nonnegativevalue between 0 and 179.13.6.16 Fields 9.151 – 9.175 Registered vendor minutiae fieldsSee Table 12 for the vendor names. The vendors define these fields.13.7 Fields 9.300 – 9.398 Extended feature set fieldsThis data block defines the content, format, and units of measurement for thedefinition and/or exchange of friction ridge feature information that may be usedin the identification of a subject based on fingerprint or palmprint imageinformation. This information is intended for an individual examiner to define thecontent of a single impression or comparison of two impressions, as well as forinterchange between criminal justice administrations or organizations that usefingerprints or palmprints for identification purposes.The purpose of this specification is to define a quantifiable, repeatable, and clearmethod of characterizing the information content of a fingerprint or other frictionridge image.13.7.1 Field 9139: EFS Coordinate systemThe relative position of all Extended Friction Ridge Features shall be expressedas positive integers in units of 10 micrometers (0.01 mm or 0.00039 in), with the49DRAFT 2
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