Patent ID: 6642955
Filing Date: 2003-11-04
Classification: G08B,H04N

Abstract:
A surveillance camera system having a control circuit that switches a camera between an infrared radiation imaging mode and a visible light imaging mode, based on an ambient light infrared sensing system having an infrared radiation and visible light bandpass filter that essentially blocks all of the infrared radiation and the visible light in a stop band comprising both infrared radiation and visible light wavelengths, the stop band spectrum covering a range of approximately 100 nanometers between approximately 680 nanometers of wavelength and approximately 790 nanometers of wavelength, the stop band thereby significantly differentiating by approximately 100 nanometers passed bandwidths of infrared radiation on a longer wavelength side of the stop band from passed bandwidths of visible light on a shorter wavelength side of the stop band, the significantly differentiated passed bandwidths of infrared and visible light respectively being allowed to proceed toward the camera for further processing.