Television – Responsive to nonvisible energy – Infrared
Reexamination Certificate
2000-01-10
2003-11-04
Kelley, Chris (Department: 2613)
Television
Responsive to nonvisible energy
Infrared
C348S014100
Reexamination Certificate
active
06642955
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to high-quality surveillance camera systems capable of capturing information from a scene under light conditions ranging from dark to well-lit.
OVERVIEW OF THE INVENTION
The invention provides a camera system that switches electronically between infrared radiation sensing and visible light sensing depending on ambient conditions. The camera is provided with a bandpass filter having a stop band between the infrared radiation spectrum and the visible light spectrum in order to provide high quality visible light images when not in the infrared mode and high quality mono infrared images when not in visible light mode. The bandpass filter assists in quantifying the ambient light for the switching control circuit.
PURPOSE OF THE SYSTEM
The purpose of the system is to provide 24 hour CCTV viewing capability of a scene irrespective of ambient lighting conditions. This is achieved by analyzing and quantifying the ambient light available. The system then chooses the appropriate mode of operation to produce optimized picture quality.
SUMMARY OF THE SYSTEM
The system comprises of the following components each of which will be further detailed below:
a) An electronic colour video CCD camera;
b) A specially designed optical bandpass filter to be used in the camera;
c) An infrared illuminator;
d) A photocell with an optical filter having a specific optical response;
e) an electronic control circuit.
The electronic control circuit integrates the functions of the component parts and enables the camera system that to switch electronically between infrared radiation sensing and visible light sensing depending on ambient conditions.
REFERENCES:
patent: 4755874 (1988-07-01), Esrig et al.
patent: 5133605 (1992-07-01), Nakamura
patent: 5732293 (1998-03-01), Nonaka et al.
patent: 5910816 (1999-06-01), Fontenot et al.
patent: 5923380 (1999-07-01), Yang et al.
patent: 5940139 (1999-08-01), Smoot
Hsu Dan
Midgley Brent
Extreme CCTV Inc.
Kelley Chris
Vo Tung
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