The rotation angle is the angle between the line joining the left and right pupil centers and the horizontal axis of the iris camera system. Counterclockwise rotation of the head about the optical axis of the camera is considered positive and clockwise rotation is considered negative.
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(2009). Rotation Angle. In: Li, S.Z., Jain, A. (eds) Encyclopedia of Biometrics. Springer, Boston, MA. https://doi.org/10.1007/978-0-387-73003-5_633
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DOI: https://doi.org/10.1007/978-0-387-73003-5_633
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