A day-and-night camera is a camera that can be used to record during the day and at night, because it adapts to the amount of ambient light in a given scene. As a result, users can easily make out the images in a scene, regardless of the amount of light that is present.
How it works
Infrared (IR) light is ideal for recording at night time or for conditions which require surveillance with minimal light. Day-and-night cameras use infrared light to automatically adapt to the ambient lighting of a given scene. To achieve this, a day-and-night camera camera uses an IR-cut filter, which prevents or allows infrared light to reach the camera's image sensor. The IR-cut filter can be turned on and off manually, or set to operate automatically based on the ambient light in a given scene. During the day, the IR-cut filter is on. As a result, infrared light is filtered out so as to not cause distortion, thus making it easier for the human eye to clearly see the scene. At night, the IR-cut filter is off, so that infrared light can produce quality black and white video of scenes and images which would otherwise be too dark to make out.
Day-and-night cameras typically have three modes: day mode, night mode, and automatic mode. The day-and-night functionality is an available feature in all types of cameras: fixed, fixed dome, PTZ, and PTZ dome.