METHOD AND COMPUTATIONS FOR CALCULATING AN OPTICAL AXIS VECTOR OF AN IMAGED EYE

METHOD AND COMPUTATIONS FOR CALCULATING AN OPTICAL AXIS VECTOR OF AN IMAGED EYE

Systems and methods for determining an optical axis vector of an eye in a three-axis coordinate system. An ellipse equation defining an iris disc corresponding to the eye, is determined on an XY plane of the three-axis coordinate system. A set of equations is derived based on the ellipse equation co...

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Hauptverfasser: BHAMIDIPATI PHANIKUMAR K, DAHL STEN JORGEN LUDVIG, RAGLAND RICHARD R
Format: Patent
Sprache:eng
Schlagworte:
CALCULATING
COMPUTING
COUNTING
HANDLING RECORD CARRIERS
IMAGE DATA PROCESSING OR GENERATION, IN GENERAL
PHYSICS
PRESENTATION OF DATA
RECOGNITION OF DATA
RECORD CARRIERS
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Zusammenfassung:Systems and methods for determining an optical axis vector of an eye in a three-axis coordinate system. An ellipse equation defining an iris disc corresponding to the eye, is determined on an XY plane of the three-axis coordinate system. A set of equations is derived based on the ellipse equation corresponding to a plurality of edge points of the iris disc in the three-axis coordinate system. An estimated iris diameter is iteratively calculated until a difference between the estimated iris diameter and a predetermined iris diameter is less than a threshold. The iterative calculation includes calculating a composite optical axis vector of the eye in the three-axis coordinate system based on solutions for the iris diameter.