Method and a device for determining the number of people present in a determined space by processing the grey levels of points in an image
US4922093A · kind A · utility
2Cited by
4References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 2, 1989 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Feb 2, 2009 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04H60/45
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method and to a device for determining the number of people to be found in a determined space, by means of a strip (14) of photodetectors (16) on which an objective lens (10) forms a linear image of a space including objects or people (12). The signals successively produced by the photodetectors (16) are compared by a microprocessor (22) in order to show up movement of people and to deduce the number of people present therefrom. The invention is applicable to performing surveillance of premises and to performing automatic television audience surveys.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.