CCTV cameras can work at night by utilizing different technologies and features that enable them to capture clear video footage in low-light or dark conditions.

Here are some key aspects of how CCTV cameras work at night: Infrared (IR) Illumination: Many CCTV cameras are equipped with infrared LEDs (Light-Emitting Diodes) that emit infrared light.

                                                    


Although infrared light is not visible to the human eye, CCTV cameras with IR illumination can detect and capture images in the infrared spectrum.

This allows the camera to illuminate the scene and capture clear video footage even in complete darkness or low-light conditions.

Day/Night (ICR) Functionality: CCTV cameras often employ a Day/Night function that automatically adjusts the camera settings to optimize image quality based on the lighting conditions.

During the day, the camera captures color video, and as the lighting conditions worsen, it switches to black and white mode for better sensitivity to low-light levels.

This functionality ensures that the camera can still capture usable footage in challenging lighting environments.

Low-Light Sensors and Wide Aperture: Some CCTV cameras are equipped with low-light sensors (e.g., Starlight sensors) that offer enhanced sensitivity to light.

Digital Noise Reduction (DNR): CCTV cameras with DNR technology reduce noise and graininess in video footage captured in low-light conditions.

This helps to produce clearer and more detailed images, even in low-light environments.

Thermal Imaging: Thermal CCTV cameras utilize thermal imaging technology, which detects heat signatures rather than visible light.

Supplementary Lighting: In some cases, additional lighting sources may be used in conjunction with CCTV cameras to improve visibility at night.

It's important to note that the performance of CCTV cameras at night can vary depending on factors such as camera quality, sensor technology, IR range, and environmental conditions.

When selecting CCTV cameras for nighttime surveillance, it is advisable to consider cameras with dedicated low-light capabilities, infrared illumination, or thermal imaging, depending on the specific requirements of your surveillance needs.

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