SLEEPINESS-ESTIMATING DEVICE AND SLEEPINESS-ESTIMATING METHOD
First Claim
1. A drowsiness estimating apparatus for estimating a drowsiness level of a subject of drowsiness estimation from among a plurality of drowsiness level candidates, the drowsiness estimating apparatus comprising:
- an acquisition section that acquires a drowsiness estimation parameter at each of a plurality of acquisition timings;
a detecting section that detects an action of the subject of drowsiness estimation;
a time-calculating section that calculates a recurrence required time which is the time it takes, from a detection timing at which the action is detected, for a value of the drowsiness estimation parameter acquired after the detection timing to return to a value of the drowsiness estimation parameter acquired before the detection timing; and
an estimating section that estimates a drowsiness level of the subject of drowsiness estimation based on the calculated recurrence required time.
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Accused Products
Abstract
A drowsiness-estimating device capable of improving the precision of drowsiness estimation by eliminating the effect of individual differences. In the device, a recurrence required time-calculating part (103) calculates the recurrence required time, which is the time needed, after a detection time when an action is detected, for a drowsiness estimation parameter value acquired after the detection time to return to the value of the drowsiness estimation parameter acquired before the detection time. A drowsiness-estimating part (104) estimates the level of drowsiness of the drowsiness-estimation subject on the basis of the calculated recurrence required time. To be specific, the drowsiness-estimating part (104) maintains a drowsiness level-estimating table in which each of multiple time ranges is correlated with a possible drowsiness level, and specifies a possible drowsiness level that corresponds to the time range, among the multiple time ranges, with which the recurrence required time is associated.
24 Citations
7 Claims
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1. A drowsiness estimating apparatus for estimating a drowsiness level of a subject of drowsiness estimation from among a plurality of drowsiness level candidates, the drowsiness estimating apparatus comprising:
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an acquisition section that acquires a drowsiness estimation parameter at each of a plurality of acquisition timings; a detecting section that detects an action of the subject of drowsiness estimation; a time-calculating section that calculates a recurrence required time which is the time it takes, from a detection timing at which the action is detected, for a value of the drowsiness estimation parameter acquired after the detection timing to return to a value of the drowsiness estimation parameter acquired before the detection timing; and an estimating section that estimates a drowsiness level of the subject of drowsiness estimation based on the calculated recurrence required time. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A drowsiness-estimating method that estimates a drowsiness level of a subject of drowsiness estimation from among a plurality of drowsiness level candidates, the drowsiness-estimating method comprising:
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acquiring a drowsiness estimation parameter at each of a plurality of acquisition timings; detecting an action of the subject of drowsiness estimation; calculating a recurrence required time which is the time it takes, from a detection timing at which the action is detected, for a value of the drowsiness estimation parameter acquired after the detection timing to return to a value of the drowsiness estimation parameter acquired before the direction timing; and estimating a drowsiness level of the subject of drowsiness estimation based on the calculated recurrence required time.
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Specification