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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSIONin degrees counterclockwise from the right 87 .• The fourth information item (direction left / DLF) is optional and isexpressed in degrees counterclockwise from the right 87 .• The fifth information item (direction right / DRT) is optional and isexpressed in degrees counterclockwise from the right 87 .• The sixth information item (type / DTP) is optional and contains the type ofdelta, as defined in Table 40.• The seventh information item (radius of position uncertainty / RPU) isoptional. It defines the radius of a circle centered at the location (X,Y) of thedelta; the circle is sized to include the area of other possible locations of thedelta, if the precise location cannot be determined (such as due to poorclarity). If the location is known precisely, the radius of position uncertaintymay be omitted or set to 0. The radius of uncertainty is measured in integerunits of 10 micrometers (0.01mm), and may overlap the edge of the image.• The eighth information item (direction uncertainty up / DUU) isoptional. It contains the uncertainty of the delta angle up. Valid valuesrange from “0” to “180”: a value of “0” (default) indicates a certaindirection, while a value of “180” indicates an unknown orientation.• The ninth information item (direction uncertainty left / DUL) is optional.It contains the uncertainty of the delta angle up. Valid values range from“0” to “180”: a value of “0” (default) indicates a certain direction, while avalue of “180” indicates an unknown orientation.• The tenth information item (direction uncertainty right / DUR) isoptional. It contains the uncertainty of the delta angle up. Valid valuesrange from “0” to “180”: a value of “0” (default) indicates a certaindirection, while a value of “180” indicates an unknown orientation.Table 40 EFS delta codes87. The three angles shall be reported in order by increasing angle, which for fingerprint deltas with knownorientation will result in the order up, left, then right. These three information items may be omitted (leftempty).158