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Detection of the open/closed state of eyes based on analysis of relation between eye and eyebrow images in input face images

  • US 5,878,156 A
  • Filed: 02/12/1996
  • Issued: 03/02/1999
  • Est. Priority Date: 07/28/1995
  • Status: Expired due to Term
First Claim
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1. A face image processing system operable to detect when a target person is in the process of falling asleep, said system comprising:

  • input means for acquiring an input image representing at least a portion of a face of said target person;

    eye extraction region setter means for determining an eye extraction region within the input face image;

    extractor means for extracting first and second image portions from the eye extraction region, said first and second image portions corresponding to an eyebrow image and an eye image respectively;

    first detector means for detecting relative positions of said first and second image portions extracted; and

    second detector means for detecting when said target person is in the process of falling asleep by determining an open and closed state of the eye image through analysis of variations in the relative positions detected.

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