Image detection and processing for building control
US9082202B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 31, 2013 |
| Grant date | Jul 14, 2015 |
| Priority date | — |
| Expiry date | Jan 29, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06T2207/30232
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Occupancy detection for building environmental control is disclosed. One apparatus includes at least one image sensor and a controller, wherein the controller is operative to obtain a plurality of images from the at least one image sensor, determine a color difference image of a color difference between consecutive images of the plurality of images, determining an area of the color difference image wherein the color difference is greater than a threshold, create an occupancy candidate based on filtering of the determined area if the determined area is less than light change threshold, generate one or more centroids that represent areas of the occupancy candidate that are greater than a second threshold, track the one or more centroids over a period of time, detect occupancy if one or more of the centroids is detected to have moved more than a movement threshold over the period of time.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.