ANSI/NIST-ITL 1-2011 - NIST Visual Image Processing Group ...

ANSI/NIST-ITL 1-2011Data Format for the Interchange of Biometric and Forensic InformationIf this field is omitted, the direction shall default to 0 (upright) and uncertaintyshall default to 15, indicating that the image is rotated 0±15°.If orientation cannot be determined, the uncertainty subfield shall be set to 180.This field contains the following information items:• The first information item (Direction / EOD) contains the deviation of theregion of interest from upright (fingertip up) in integer degrees. Positiveangles are counterclockwise, negative angles are clockwise. A value of “0”indicates an upright direction. Valid values range from “-179” through“180”.• The second information item (Uncertainty / EUC) contains the uncertaintyof the orientation direction, in non-negative integer degrees, so that theresulting orientation is Direction± Uncertainty°. Valid values range from “0”to “180”: a value of “0” indicates a certain direction, while a value of “180”indicates an unknown orientation. If this information item is omitted, theuncertainty shall default to “15” (±15°).Figure 7: Example of orientation: -25 ± 20 degrees13.7.12 EFS Field 9.302 Finger/Palm/Plantar Position / FPPThis mandatory field shall contain one or more of the possible physical positionsthat correspond to the region of interest. Multiple data entries may be used tonote the presence of more than one position in the image: polygons are requiredin this case to delineate the locations of the positions. For example, a region ofinterest that includes a finger’s medial and proximal segment can note those as67DRAFT 2