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Device for judging degree of awakening and method for judging degree of awakening

A judging device and judging method technology, which is applied to the safety device, transportation and packaging of the power plant control mechanism, and instruments, etc., can solve the problems of low awakening degree and not quite strong awakening degree, and achieve the effect of reliable detection

Inactive Publication Date: 2009-09-30
TOYOTA JIDOSHA KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, in the above technique, since the state of arousal is judged based on the time and frequency of blinking, it cannot be detected that the degree of arousal has decreased unless the degree of arousal has decreased greatly (i.e., if the drowsiness is not quite strong).

Method used

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  • Device for judging degree of awakening and method for judging degree of awakening
  • Device for judging degree of awakening and method for judging degree of awakening
  • Device for judging degree of awakening and method for judging degree of awakening

Examples

Experimental program
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Effect test

no. 1 Embodiment approach

[0073] First, use figure 1 The overall configuration of the awakening degree determination device 1 according to the first embodiment will be described. figure 1 It is a block diagram showing the overall configuration of the awakening degree judging device 1 . Next, a case where the awakening degree determination device 1 is mounted on a vehicle and detects a decrease in the awakening degree of the driver of the vehicle will be described as an example.

[0074] The awakening degree determination device 1 detects whether the driver's awakening degree has decreased based on the heart rate signal obtained from the driver, presents the detection result to the driver, and gives a stimulus to increase the awakening degree. Therefore, the awakening degree determination device 1 includes a heart rate sensor 10 and an electronic control unit (hereinafter referred to as "ECU") 20, and the ECU 20 is composed of a heart rate signal preprocessing unit 21, a feature extraction unit 22, a d...

Embodiment 1

[0112] A wakefulness reduction detection test was performed as a function evaluation test of the above-mentioned wakefulness determination device 1 . Here, the evaluation test was performed by comparing the sleepiness detection result based on the heart rate fluctuation low-frequency component power of the test subject (driver) and the sleepiness level sensory evaluation result obtained from the face image. The test method and test results will be described. The test was carried out as follows.

[0113] 1. Obtain the subject's face image time series while measuring the heart rate signal.

[0114] 2. Evaluate the facial image time series based on the following levels 1 to 5, and classify the subject's sleepiness into five levels (sensory evaluation). In addition, two evaluators for the sensory evaluation were used.

[0115] Level 1: No drowsiness at all (fast and frequent eye movement, steady cycle of blinking 2 times in 2 seconds, active movements accompanied by physical ac...

Embodiment 2

[0126] The arousal reduction detection test was performed on the subjects different from Example 1. The test method is the same as that of the above-mentioned Example 1, so the description is omitted here.

[0127] Figure 17 Indicates the experimental results of this arousal reduction detection test. Also in this test result, when the drowsiness level according to the sensory evaluation is rank D1 (slightly drowsy), it is judged to be weakly drowsy by the wakefulness judging device 1 . In addition, when the sleepiness level according to the sensory evaluation is the sleepiness level D2 (drowsiness), it is judged by the awakening degree judging device 1 that the drowsiness is strong. That is, the sleepiness detection of the subject was successfully performed by the awakening degree judging device 1 , and the effectiveness of the awakening degree judging device 1 was confirmed.

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Abstract

The present invention provides a device for judging a degree of awakening comprises a heartbeat signal preprocessing section (21) having a heartbeat sensor (10) for acquiring a heartbeat signal from a driver and an ECU (20) for detecting sleepiness of the driver by processing the heartbeat signal wherein the ECU acquires a heartbeat period time series from the heartbeat signal, a feature amount extracting section (22) for acquiring heartbeat fluctuation low frequency component power from a heartbeat period signal, a sleepiness detecting section (23) for judging whether sleepiness of the driver has occurred or not based on the heartbeat fluctuation low frequency component power, a stimulus timing setting section for setting a timing at which to impart stimulus for removing sleepiness to the driver based on the heartbeat fluctuation low frequency component power, and a sleepiness removing stimulus output section (26) for imparting stimulus to the driver at a timing thus set.

Description

technical field [0001] The present invention relates to an awakening degree judging device and an awakening degree judging method. Background technique [0002] Historically, techniques have been devised to detect a person's level of awakening. As such a technology, the technology described in Patent Document 1 is to capture a person's eyeball and extract the pupil area of ​​the eyeball from the captured image, and based on the shape change of the extracted pupil, the When the time and frequency of the time are equal to or greater than a predetermined value, it is determined that the degree of awakening has decreased (Patent Document 1, Japanese Patent Laid-Open No. 6-270711). [0003] However, in the above technique, since the state of awakening is judged based on the time and frequency of blinking, it cannot be detected that the degree of awakening has decreased if the degree of awakening is not greatly reduced (that is, if the sleepiness is not quite strong). For this r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61B5/18G08G1/16G08B21/06
CPCG08B21/06A61B5/04012A61B5/7257A61B5/0456A61B5/18B60K28/06A61B5/4035A61B5/165A61B5/024A61B5/4809A61B5/316A61B5/352G08G1/16A61B5/347
Inventor 畠山善幸
Owner TOYOTA JIDOSHA KK