| 摘要 |
A camera system switches electronically between infrared radiation sensing and visible light sensing depending on ambient conditions, to optimize visible picture quality for surveillance. An electronic CCD camera has an optical bandpass filter having a stop band between the infrared radiation spectrum and the visible light spectrum 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. A control circuit compares the camera signal with a photocell signal and controls the camera's sensing mode and an if illuminator's operation in accordance with the ambient conditions.
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