What is a day and night dual pass filter? Manufacturer of spherical lens introduce to you
Infrared light is a kind of stray light for color image in visible light environment such as daytime, which will reduce the clarity and color recovery of camera, and even cause ghost, erythema and other problems. There are two ways to solve the problem.
1) Switching mechanism ICR is adopted ——Manufacturer of spherical lens introduce to you
This method needs to use an infrared cut-off filter and ordinary white glass, infrared cut-off in the daytime and ordinary white glass at night. This scheme needs a motor switch, which not only has high cost, but also has a high failure rate of switching mechanism. The camera also needs a motor drive control chip, so the overall cost is very high and the workload is heavy.
2) Day night dual pass filter——Manufacturer of spherical lens introduce to you
Open a specific infrared channel on the filter to allow the infrared with the same wavelength as the infrared channel to enter. This is the day and night dual pass filter. The filter is composed of the optical glass substrate and the filter film deposited on the optical glass substrate, which can block the ultraviolet and infrared light in the mixed light source, so that the CMOS or CCD chip can be protected from the influence of ultraviolet and infrared signals, and get more distinct influence. At the same time, the filter can selectively pass through part of the infrared spectrum according to the different wavelength characteristics of the infrared lamp, and resist strong light It has strong stray light ability and less color distortion, which makes it possible to achieve high-definition picture without visible light.
