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- W6956903 abstract "Publisher Summary This chapter illustrates a non-invasive instrument for eye orientation measurements in natural environments. Techniques for real-time pattern recognition and feature analysis from standard video signals have been applied to monitor eye movements and pupillary size during visual field and electrophysiological examinations in routine ophthalmological practice. The eye of the patient is illuminated with near infrared radiation. Part of the incident light beam is reflected by the cornea and it produces corneal reflection. The transmitted rays are reflected from the retina and back to light the pupil. The eye orientation is determined from the relative position of the corneal reflection with respect to the bright pupil image. The video signal is analyzed in real time by a shape detector circuit to detect the beginning and the end of the pupil and the corneal reflection on each video line. Using shape detection instead of amplitude level or amplitude variation detection improves performance significantly with low-contrast images. It eliminates the problems associated with variations of the detection thresholds with pupil size fluctuations. The pupil boundary is identified by several algorithms making use of contour continuity and curvature consistency." @default.
- W6956903 created "2016-06-24" @default.
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- W6956903 date "1987-01-01" @default.
- W6956903 modified "2023-09-23" @default.
- W6956903 title "A NON INVASIVE INSTRUMENT FOR EYE ORIENTATION MEASUREMENTS IN NATURAL ENVIRONMENTS" @default.
- W6956903 doi "https://doi.org/10.1016/b978-0-444-70113-8.50089-8" @default.
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