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The figure above shows an actual image captured by
one of the cameras. After the image is acquired, image processing is used
to automatically detect the eyes and specific eye features in the image. Particularly,
pupils are detected (pupil centers are marked with small crosses). Also
note the small bright spots that appear in the pupil. These are reflections
of the light sources off the cornea surface. These reflections, or glints,
are also detected (a small box is drawn around each reflection in the above
image) and matched with corresponding light source.
After image processing is complete, detected eye
features (pupil centers and glints) are used in the estimation of the optical axis of the
eye.
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