Understanding IR cut and m12 board lens

Understanding IR cut and m12 board lens

AS The advent of the era of high-definition network monitoring coming, so the analog signal devices in the past tends to digital signal devices.However, no matter how the technology progress, the basic principle of camera imaging is still the same, the first contact to the key components of the light is still the m12 board lens, and then is the sensor and DSP.

In the analog signal era, the sensor is mainly CCD,In high-definition digital signal era, CMOS sensor has become the mainstream, not only can break one million pixels, as compared to CCD, CMOS have the unique advantage such as cost.BUT cmos also has some disadvantages comparing to ccd,it is for the infrared light.if we can not filter the infrared light,the image will cause serious partial color.if we filter all the infrared light,it is difficult for the coms to have enough light to image.So IR CUT double filter has become an important component in the era of high-definition digital signal for the m12 board lens.

The selection of m12 lens and IR CUT is one of the keys to influence the quality of the camera.IR CUT is the key factor for the quality of the light.

Usually the camera sensor can receive the most wavelengths, including infrared light.The sensor can be interferenced by the infrared light.infrared light will be turned into a signal and will produce noise. the noise will be transmitted to the back-end monitor,making the image color distortion,it is not the same with the reality of the environment,the monitor may be green to blue, will to change the background color of the image.In order to solve the problem of color distortion, usually stick to a low pass filter on CCD or CMOS, the filter has hindered the infrared , so the color distortion will not happpen during the day , but at night, the camra will not have night vision function.In order to solve the problem , the day and night camera will use a infrared light, when opening the light, letting the infrared light go in,so it is  a solution for the night vision function.But it is also have a problem about  partial color.so the ir cut for the m12 board lens appear.

IR-CUT, there are two different ir cut filters: low-pass filter and high pass filter, by switching to filter, in the daytime only allow 650NM or 780NM below the wavelength of the light, prevent the interference of stray light, so the distortion of the image color will not appear.At night, letting more than 760NM of infrared to enter, so that the camera has a night vision function, so the camera installed IR-CUT, whether in the day or at night, it can have the best image effect.

M12 borard Lens and IRCUT to make the quality of the camera image to achieve the best visual effect.