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Drowsiness detection method and system for determining the degree of eye opening and closure

  • US 10,123,686 B2
  • Filed: 10/27/2015
  • Issued: 11/13/2018
  • Est. Priority Date: 04/22/2015
  • Status: Active Grant
First Claim
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1. An eye detection method for detecting a degree of eye opening and closure of a testee, comprising:

  • detecting a location of an eye pupil, a location of an inner eye corner and a location of an outer eye corner of an eye of the testee;

    calculating an eye width according to the location of the inner eye corner and the location of the outer eye corner;

    multiplying the eye width by a specific ratio smaller than 1 to obtain an eye height;

    generating a rectangular region of interest with a center on the location of the eye pupil, a length equal to the eye width, and a width equal to the eye height; and

    determining a ratio of the eye occupying a detection area in the region of interest, and determining the degree of eye opening and closure of the testee accordingly;

    wherein the step of determining the ratio of the eye occupying the detection area in the region of interest and determining the degree of eye opening and closure of the testee accordingly comprises;

    performing an image binarization on an eye image within the region of interest, to generate a binarized image having an eye region and a non-eye region;

    performing a filling process on the binarized image to eliminate a noise in the eye region determined to be the non-eye region;

    detecting an area of the eye region within the detection area after the filling process is accomplished; and

    determining that the eye of the testee is closed when a number of times the ratio of the eye region occupying the detection area smaller than a threshold value is detected in a specific period of time reaches a specific number.

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