Surveillance camera
US9774796B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 2015 |
| Grant date | Sep 26, 2017 |
| Priority date | — |
| Expiry date | Sep 12, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/74
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is a surveillance camera including an optical system, an irradiator; an illuminance sensor, a photoelectric converter, an analog-digital converter, and a main controller. The optical system includes a lens. The irradiator irradiates a wave, different from a visible light ray, in a night mode. The illuminance sensor is installed in a light receiving direction different from a light receiving direction of the optical system. The photoelectric converter is configured to convert light from the optical system into an electrical analog image signal. The analog-digital converter is configured to convert the analog image signal from the photoelectric converter into a digital image signal. The main controller is configured to control the surveillance camera to switch between a day mode and the night mode according to gradation of the digital image signal and illuminance sensed by the illuminance sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.