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

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ANSI/<strong>NIST</strong>-ITL 1-<strong>2011</strong> - UPDATE 2013 DRAFT VERSIONis encoded as a hexadecimal value. As an (unrealistic) example of a 90 degree value:round(65535 * 90 / 360) modulo 65535 equals 16384.This is 4000 when converted to hexadecimal.For encoding angular orientation of an eye not directed toward the camera, see Field17.041: Frontal gaze / GAZ. It may be difficult to estimate rotation using a monocularcamera. In such cases, the rotation uncertainty encoded in Field 17.015: Rotationuncertainty / RAU will be appropriately larger.Figure 18: Coordinate system <strong>for</strong> eye rotation angleRight eye Left eye8.17.15 Field 17.015: Rotation uncertainty / RAUThis optional field shall indicate the uncertainty in the in-plane eye rotation given in Field17.014: Rotation angle of eye / RAE. This field is mandatory if Field 17.014: Rotationangle of eye / RAE is present. The rotation uncertainty is non-negative and equal to[round (65535 * uncertainty / 180)] 170 . The uncertainty is measured in degrees and is theabsolute value of maximum error. The value “FFFF” indicates that uncertainty isundefined. Note that this is encoded as a hexadecimal value.8.17.16 Field 17.016: <strong>Image</strong> property code / IPCThis optional field shall contain the image property code. It shall contain threein<strong>for</strong>mation items.• The first in<strong>for</strong>mation item is the horizontal orientation code / IHO. Values <strong>for</strong>Horizontal Orientation shall be one of: “0” <strong>for</strong> Undefined, “1” <strong>for</strong> Base, or “2” <strong>for</strong>Flipped. “Base” orientation refers to images corresponding to the view facing thesubject, where the nasal side of subject’s left eye or outer edge of the subject’sright eye is on the left side of the image. “Flipped” orientation refers to imageswhere the orientation is opposite from that described <strong>for</strong> “Base”.May, 2013 DRAFT VERSION UPDATE 2013 Page 353

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