System for detecting an item within a specified zone
US8908024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 29, 2011 |
| Grant date | Dec 9, 2014 |
| Priority date | — |
| Expiry date | Nov 21, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08B13/19604
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
The disclosure reveals a system for detecting one or more persons in a specified zone. A determination is whether there is a person in the zone. A presence determination module may indicate from a current image of the zone compared with a reference image of the zone, whether there is a person in or not in the zone. An illumination controller may assure that the zone is sufficiently illuminated for a current image sufficient for comparison with the reference image to determine a possible presence of a person in the zone. The illumination may be infrared. The system may be used to assure appropriate and adequate face velocity at a fume hood having the presence of a person and having minimal face velocity in the absence of a person at the fume hood.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.