Patent ID: 6346887
Filing Date: 2002-02-12
Classification: A61B,G08B

Abstract:
An eye activity monitor for alerting a task operator, the monitor comprising:a signal processing module comprising input means for receiving eye activity data representing the eye activity of the task operator, an eye tracking module coupled to the input means for measuring the eye activity of the task operator and for producing a signal representing the eye activity data including pupil diameter and pupil position, update means for updating the eye activity data at least 60 times per second, memory means for storing a sample history representing at least ninety seconds of the eye activity data, processing means for calculating eye activity parameters representing a moving average of pupil diameter, a history of blink frequency and duration, and a history of visual fixation frequency and duration, and output means for producing a signal representing the calculated eye activity parameters for use in generating an alertness estimate; and a fatigue countermeasures module for generating alarms to alert the task operator responsive to the alertness estimate.