Sleepiness level determination device for driver
First Claim
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1. A sleepiness level determination apparatus comprising:
- a detecting device for performing a predetermined image processing on a face image, which is shot at predetermined shooting time intervals and shows a face of a driver, and for detecting an eye image based on the face image;
a characteristic value calculating device for calculating a plurality of different characteristic values of eye based on the eye image detected by the detecting device, the characteristic values of eye including a period of time from a start to an end of one blink, a time interval of closing an eye, a closing speed of an eyelid, and an opening speed of the eyelid;
a sleepiness level determining device for determining a sleepiness level among a plurality of sleepiness levels, based on a predetermined estimation function having the plurality of different characteristic values of eye as a plurality of explaining variables calculated by the characteristic value calculating device;
a representative characteristic value determining device for obtaining a distribution of each characteristic value of eye with respect to every sleepiness level when the sleepiness level determining device determines the sleepiness level and for determining a representative characteristic value with respect to each distribution; and
a reliability calculating device for calculating reliability of the sleepiness level determined by the sleepiness level determining device according to proximity between each characteristic value of eye at a time when the sleepiness level is determined and a corresponding representative characteristic value determined by the representative characteristic value determining device with respect to the sleepiness level determined by the sleepiness level determining device.
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Abstract
A sleepiness level determination device includes: a detector processing a face image of an user and for detecting an eye image of the user based on the face image; a characteristic value calculating unit calculating a characteristic value regarding the eye based on the eye image; a sleepiness level determining unit determining a sleepiness level based on the characteristic value; and a reliability calculating unit calculating reliability of the sleepiness level based on the characteristic value.
19 Citations
11 Claims
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1. A sleepiness level determination apparatus comprising:
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a detecting device for performing a predetermined image processing on a face image, which is shot at predetermined shooting time intervals and shows a face of a driver, and for detecting an eye image based on the face image; a characteristic value calculating device for calculating a plurality of different characteristic values of eye based on the eye image detected by the detecting device, the characteristic values of eye including a period of time from a start to an end of one blink, a time interval of closing an eye, a closing speed of an eyelid, and an opening speed of the eyelid; a sleepiness level determining device for determining a sleepiness level among a plurality of sleepiness levels, based on a predetermined estimation function having the plurality of different characteristic values of eye as a plurality of explaining variables calculated by the characteristic value calculating device; a representative characteristic value determining device for obtaining a distribution of each characteristic value of eye with respect to every sleepiness level when the sleepiness level determining device determines the sleepiness level and for determining a representative characteristic value with respect to each distribution; and a reliability calculating device for calculating reliability of the sleepiness level determined by the sleepiness level determining device according to proximity between each characteristic value of eye at a time when the sleepiness level is determined and a corresponding representative characteristic value determined by the representative characteristic value determining device with respect to the sleepiness level determined by the sleepiness level determining device. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification