You might have come across night vision cameras many times and might have thought about how it functions. If explained in lay man’s language, the black and green or black and white footage that you might have seen in various TV shows showing paranormal activities or ghost hunting. The cameras having night vision technology which enables them to capture in dark are called night vision cameras.
Night vision technology works with three different methods those are low light imaging, thermal imaging and infrared illumination method.
Low Light Imaging
Low light imaging cameras functions on image intensifiers. An amplified image is produced by the intensifiers by enlarging the available light. When the light object focuses on photocathode then the light intensifying effect is produced. The image is created when electrons strike on the phosphor screen. During low light situations a clear image is created by intensified cameras systems using intensifiers. This creates a broader image of the scene present in low light area and enables us to view it. To capture the footage or image these cameras need some available light. However the images produced by these cameras in low light are excellent, these are able to identify the people in low light scenes. These are available in the affordable prices and are a popular choice as home security cameras.
This technology works on the principle that infrared energy is produced by the object because of its temperature. Such type of cameras does not need any light to record an image. The more the temperature is, the more the emission of infrared radiations it will be. Thermal image is produced by Infrared energy. The produced thermal images look black when emitted by a cold object and are white when the hot object is there. There are certain thermal cameras which can produce the colour images. These cameras are capable of capturing the objects at a great distance. These cameras have higher level of thermal sensitivity. They do not require any light source.
Infrared illumination along with the motion detection technology produces image for these cameras. It functions by detecting the movement of the object then the infrared illumination lit up the scene and records the images. Infrared illumination functions with LED lights and produces images in black and white, which are high quality images. In addition with motion detectors and no requirement for any light source they highly efficient and produces excellent monitoring.