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

ANSI/NIST-ITL 1-2011 - UPDATE 2013 DRAFT VERSION8.17.34 Field 17.036: Lower eyelid boundary / LEBThis optional field defines the boundary between the lower eyelid and the eye. SeeSection 7.7.12 for a description of encoding paths. This is an open path.8.17.35 Field 17.037: Non-eyelid occlusions / NEOThis optional field defines the outline and contents of any non-eyelid occlusions thatpartially or totally blocks the image of the iris. It is a polygon. (See Section 7.7.12 for adescription of a polygon). For details on entering data for this Field, see Section7.7.12.2 . Each point on the polygon is represented by a pair of information items. Inaddition to the information items for the points on the polygon:• The first information item contains the alphabetic code from Table 20: Occlusionopacity• The second information item contains the alphabetic code from Table 21:Occlusion type8.17.36 Field 17.040: Range / RANThis optional field contains the estimated distance from the lens of the camera to the iris.It shall be measured in centimeters.8.17.37 Field 17.041: Frontal gaze / GAZThis optional field describes the metric that estimates the degree of eye(s) sight-anglerelative to the camera. The angle shall be reported in degrees and defined as between:• The optical axis of the eye, and• A line connecting the optical center of the eye and the optical center of thecamera.This measure is inclusive of both head angular orientation and eye-gaze angle relative tothe head. The inclusive approach for gaze direction is not intended to be representativeof the possible difficulty with iris segmentation due to non-frontal head orientation.Hence, two images with the same frontal gaze, but significantly different frontal headorientation may perform differently with different segmentation and matching algorithms.Note that iris image recognition systems typically rely upon having a small gaze angle inthe image. While not prohibited in this standard, it is strongly discouraged that gazeangles greater than 15 degrees be used for enrollment or matching.8.17.38 Fields 17.200-900: User-defined fields / UDFThese fields are user-defined fields. Their size and content shall be defined by the userMay, 2013 DRAFT VERSION UPDATE 2013 Page 359