What is IR-CUT? The working principle and function of IR-CUT
Category： Industry News
Time：2023-09-21
IR-CUT: A filter that guarantees the imaging effect of the camera
IR-CUT double filter refers to a set of filters built into the camera lens group, when the infrared sensing point outside the lens detects the intensity of the light, the built-in IR-CUT automatic switching filter can automatically switch according to the strength of the external light, so that the image achieves the best effect. This means that the dual filter automatically switches filters day or night, so you can get the best possible image day or night.
IR = infrared = infrared, CUT = filter, subtract
Surveillance camera field: filter infrared light, let it cut off or pass, image call it: dual filter switcher.
The role of IR-CUT dual filter switcher for the camera: correct the problem of color cast during the day and improve the brightness at night.
The principle of IR-CUT dual filter switcher
The IR-CUT dual filter switcher is composed of: filter (one infrared cut-off or absorption filter and one full translucent filter) + power part (can be electromagnetic, motor or other power source).
There are various wavelengths of light in nature, the wavelength range of the human eye to identify light is between 320nm-760nm, and the lightbeyond 320nm-760nm cannot be seen by the human eye, such as infrared light, ultraviolet rays, etc.
The imaging component CCD or CMOS of the camera can see most of the wavelength of light, due to the participation of various lights, the color restored by the camera and the naked eye in the color deviation, in order to try to solve the color shift problem: the current scheme is to paste a single layer or multiple layers (both visible and infrared light through) bimodal filter in front of the CCD. During the day, due to infrared and other stray light entering the CCD, it will interfere with color reproduction, such as green plants becoming gray, red clothes becoming lighter, etc. (especially obvious outdoors with sunlight); At night, due to the filtering effect of the bimodal filter, the CCD cannot make full use of all light, and the noise and its low-light performance are unsatisfactory.
IR-CUT double filter switcher in the day when the light is full, the infrared cut filter works, CCDrestores the true color, when the night light is insufficient, the infrared cut-off / absorption filter automatically moves, the full spectrum filter starts to work, so that the CCD makes full use of all the light, thereby greatly improving the low illumination performance.
Keywords： What is IR-CUT? The working principle and function of IR-CUT
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