Doze detection method and apparatus thereof
US9286515B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 4, 2012 |
| Grant date | Mar 15, 2016 |
| Priority date | — |
| Expiry date | Oct 6, 2032 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61B5/0077
- WIPO fieldMedical technology
- WIPO sectorInstruments
Abstract
A doze detection method, which accurately detects a blink burst and improves speed and accuracy of doze detection, includes measuring a state where the eye is substantially open as an open eye time and another state as a closed eye time, defining a time shorter than an average blink interval of a healthy adult in an alert state as a first threshold time; defining a time longer than an average closed eye time of a healthy adult in an alert state as a second threshold time; and defining blinks as a blink burst when detecting an eye opening equal to or shorter than the first threshold time. A doze state is determined when the closed eye time of a blink among the blinks during the blink burst reaches at least the second threshold time, the blink occurring after an open eye time equal to at most the first threshold time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.