red ->X (In Camera coordinates [deg])
green ->Y (In Camera coordinates [deg])
pink ->X (Head movement [pixel])
SpringGreen ->Y (Head movement [pixel])

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method -> Pupil-RotationCenter

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method -> Pupil-Reflection

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Eye movements are mesured by two methods. Under method is allow small head movement, so eye movements are not influenced by head movements
+ mark shows reflection center measured by image processing, X mark shows calculated reflection center by using pupil center and eye rotation center. When head is fixed,+ mark overlaps wiht X mark.