I have a night of low illumination and camera, but camera at night can't see anything! "Such complaints is the experts often hear, but this kind of situation should be rare. Originally the dark scene at night need to be even close to 0 lux camera. Most of the camera sensitivity can reach 0.05 lux, 20 times more dark than general moonlight. However, why 0.05 lux levels of camera under the moonlight even street lamp, but unable to get a good night video?

Most camera manufacturers claim that their dual-use cameras day and night still can get the video in the dark, the other day and dual camera manufacturers also claim under 0 lux can provide video quality assured. These show that the camera can be in complete darkness, but the reality is not said. If there is no light, there may be no images, it is a physical fact.

Here not talking about street lighting. Street lighting and other forms of environmental lighting may be make streets more bright, but usually is not good for important target area; May even make the situation worse. When the end user request high quality video at night, you need to monitor and control system for specific lighting design, and not for the street environment and buildings.

The camera itself cannot be observed objects in total darkness. The fact is that dual cameras day and night can't without any form of lighting grab the image in the dark. Dual cameras day and night to form good night video, must be with an infrared function, and must have the invisible infrared lamp.

Lux illumination

Lux degree of accurate meaning is what? Lux can measure the eye of the visible light. Lux degree only limit in human eyes narrow range, of course, it can't measure active infrared light, under this kind of lighting can be effectively monitored at night. For example, a 0 lux scene (not visible) for the human eye is complete darkness; But if the same after 0 lux scene is good infrared lighting, it remains zero lux illumination, the human eye is completely dark, but for the infrared camera, it provides similar to normal black and white images during the day.

In order to state the fact that in another way, it is day and night and the camera only when it has is highly sensitive to the infrared light, as well as in the case of have infrared illumination in the scene to operate. Have a number of low illumination itself, low illumination and dual-use cameras day and night almost never provide good night vision effect. If need to monitor the dark scene, then no matter how much is the intensity of illumination for the camera, you need to use the infrared lamp. This condition is rarely mentioned, and often misunderstood by unskilled security staff.

As clarified that dual camera error, day and night, leading security vendors learned how to take the initiative to infrared lighting provide for the customer not to imagine the night vision effect. The good news is that now the dual camera is sensitive to infrared light, day and night, with the best infrared lighting equipment, can be produced under long-distance excellent video monitoring results.

Infrared lighting for dual-use cameras day and night in the dark to work effectively, but the real infrared lighting is what? Active infrared lighting equipment for the CCTV system provided by the human eye can't see in the light of 700 nm to 700 nm wavelength; The human eye can see all the light fell in a small area of electromagnetic spectrum. Radio waves, microwave, and X are part of the same spectrum of light, the only difference in the long wavelengths, different, but the problem is that the human eye cannot see most of the commonly these wavelengths.

However, the infrared camera can see the human eye can't see the wavelength range. Special CCD technology for infrared wavelength light. If plenty of infrared light in the scene, for the human eye is completely dark scene, the infrared camera is a excellent image brightness.

Active infrared

In active infrared night vision system, the infrared camera is just one part of it. Active infrared night vision system is different from other night vision technology, such as passive infrared thermal imaging and enhanced the CCD camera, etc. Thermal imaging cameras, for example, by detecting temperature nuances to generate the image, such as a warm body in a cold environment, the result can meet the detection purposes, usually image resolution is significantly lower, but the resolution of 320 x 240 pixels in general. Low resolution are usually unable to distinguish between friend or foe, and the demand for high resolution video surveillance technology, the image quality is not satisfactory.

Active infrared system is fundamentally different, it through active infrared light, can produce high-resolution images. In the UK, where more than a decade ago began to widely used active infrared system, CCTV experts recently begun to North America to realize the advantage of the active infrared technology.

Active infrared night vision system can be reliable, and economical effectively achieve high-resolution images. In practice, the system design and installation of becomes simple and intuitive, and easy to master.

System integrators in accordance with the American UF500 Derwent patent products to install infrared illuminator for engineering projects, these projects including monitoring from the common areas, to the use of intelligent software such as VMD (video motion detection) 24/7 hour video analysis. Through professional security adviser, people have generally accepted active infrared night vision system can be in various lighting environments provide 24/7 hour high resolution video.

In the growth of demand for night vision surveillance, security vendors are main integrated dual cameras, day and night under an architecture integrated infrared CCD chip and lamp.

These cameras including prison in the United States EX36 patent camera and high-end monitoring field EX82 patent camera, they provide a "plug and play" solution, to ensure that can offer excellent image in day and night. Security vendors for their customers with 24/7 hour in excellent performance camera at night, and these products are two good examples.