Invention Grant
- Patent Title: Drowsiness assessment device and program
- Patent Title (中): 嗜睡评估装置和程序
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Application No.: US13257182Application Date: 2010-03-17
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Publication No.: US08306271B2Publication Date: 2012-11-06
- Inventor: Takumi Yoda , Takuhiro Omi , Akira Kadoya , Isahiko Tanaka
- Applicant: Takumi Yoda , Takuhiro Omi , Akira Kadoya , Isahiko Tanaka
- Applicant Address: JP Aichi-ken JP Aichi-ken
- Assignee: Aisin Seiki Kabushiki Kaisha,Denso Corporation
- Current Assignee: Aisin Seiki Kabushiki Kaisha,Denso Corporation
- Current Assignee Address: JP Aichi-ken JP Aichi-ken
- Agency: Sughrue Mion, PLLC
- Priority: JP2009-068281 20090319
- International Application: PCT/JP2010/054563 WO 20100317
- International Announcement: WO2010/107066 WO 20100923
- Main IPC: G06K9/00
- IPC: G06K9/00

Abstract:
Local maxima values and local minima values are derived from eyelid openness time series data in a segment in which a continuous closed eye period of extracted blinks is a specific time duration (for example 1 second) or longer. When plural local minima values are present in the segment of continuous closed eye period of 1 second or longer, blinks are extracted passing over and back through each variable closed eye threshold value of a variable closed eye threshold that is slid in a direction from the derived local maxima value towards the local minima value in set steps to a low value, and a inter-blink interval derived. Determination is made that a blink burst has occurred when the derived inter-blink interval is 1 second or less, and say greater than 0.2 seconds, thereby detecting a blink burst. Blink bursts can be detected with good precision, and the state of drowsiness can be assessed with good precision.
Public/Granted literature
- US20120002843A1 DROWSINESS ASSESSMENT DEVICE AND PROGRAM Public/Granted day:2012-01-05
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