For the past few years, there has been a lot of advancement in security technology. Some security systems take images even when there is little to no light. Advanced security systems with such features are available for an affordable price. Let’s get to understand how these security cameras work at night.
Infrared Night Vision
Most of the security cameras use Infrared night vision that relies on infrared light. If you clearly observe the front end of the security cameras, they are filled with plenty of small LED bulbs. As it gets dark, these LED bulbs act as IR light. This helps to enhance the cameras field view at night. This IR light is not visible to naked eyes.
The night footage of these security cameras are mostly in monochrome colours. This is because human eyes can easily differentiate between white and black colours and this helps us to see the image better. During the night time, the IR filter gets removed automatically. But, in day light, the IR filter activates and blocks the IR light to see all the colours accurately.
Night vision cameras have intensifier tubes. They convert the light entering the security cameras into electronic signals. These electrons are multiplied by photomultipliers present in the cameras. The multiplied electrons enter the phosphor screen and result in brighter images. All the colours entering the goggles are converted to green colour once they enter the phosphor screen.
Surprisingly, the night vision goggles amplify the light taken from streetlights and moon. But, most of the security cameras designed now is dependent on IR lights, which help to capture better image quality. If you are looking for this kind of cameras, Hikvision offers some security cameras made for outdoor use.
Cameras with Infrared Illumination technology capture the images by combining with motion detection technology. Infrared illumination lights up when it detects any movement and then captures the images. They work with multiple LED lights to transmit the images in monochrome colour. Infrared Illumination, when combined with motion detectors, can give the best results and monitor a wider area.
This is how security cameras work during night. They either depend on Infrared light or work with motion detection. Some cameras also use intensifier tubes to capture the best image quality.