Photography and videography are common tools in implementing security. These measures can monitor and capture images of suspicious or criminal activity which could then be used to detain bad guys. They require light to work, and leaving the lights on or illuminating all areas are not options for reasons of cost-efficiency and practicality. Night vision cameras are used instead.
These devices are best known for their applications in secure environments. This is only natural, since night vision cameras work best when held still, for example when they are mounted on braces or some other mechanisms. They can capture images even when the lights are out, so places of business or banks can turn off the lights and close up shop without being worried about loss of security capabilities.
Many night vision cameras produce monochromatic images, that is, images with only shades of one color. Prime examples are black-and-white images and green photographs. This is the result of the technologies they use to capture images in darkness. They’re employed well for security cameras and similar devices since color isn’t an enormous issue while lucidity and resolution of the image is. Monochrome is the result of maximizing picture qualities outside of color factors.
One technology used in night vision cameras is image intensification. The camera takes in the view, and particles of energy strike sensitive layers in the camera. These signals are translated into something that humans can see, thus the use of monochrome where the brighter the color, the more photons or particles there were entering the camera from that point in the area of observation. Normally, photons within the spectrum of obvious light are used to operate these cameras, but other types of radiation from wavelengths outside the visible range for humans are used. Infrared is the hottest. Illuminating an area with high-infrared washes it in “invisible” light, which makes the scene clear and bright for the properly-equipped camera. This illumination can also be seen with night vision devices, and can serve as deterrents to any thieves who know of the security measures.
The other technology used in night vision cameras is thermal imaging. This is good for applications where you simply need to identify something by its silhouette and not by features like faces. Since they require no light and instead sense variations in temperature expressed in low-infrared, they are excellent for placement on perimeters. These are usually wired to alarm systems, which would trip when any “intruder” as defined by the programming would enter the field of view.
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