Device and method for detecting drowsiness using eyelid movement
US9220454B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 20, 2012 |
| Grant date | Dec 29, 2015 |
| Priority date | — |
| Expiry date | Aug 20, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30201
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A drowsiness detection device and method for a person (4), having a digital camera device (2) and a control unit (5). The digital camera device (2) includes a video processor (6). The digital camera device (2) is arranged to detect the eyes (3) of the person (4) in a series of images. The video processor (6) is arranged to detect eyelid movements in the images and convert images of the eyelid movements to an electric signal (s(t)) which is transferred to the control unit (5) The control unit (5) is arranged to fit a modeled signal (y(t)) against the electric signal (s(t)) and to determine whether the modeled signal (y(t)) constitutes an eyelid blink. The control unit (5) uses a number of modeled signals (y(t)) determined to constitute an eyelid blink to determine whether the level of alertness has fallen below a certain threshold.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.