Generally, the ultra-low illumination camera adopts the ExviewHAD technology. The camera adopting the ExamHADCCD will greatly increase the sensitivity to external light. In the near-infrared region, the sensitivity can be increased to 4 times that of the ordinary camera, such as (Figure 1). Therefore, even in a very dark environment, this type of camera can usually see objects that are invisible to the human eye. The emergence of this technology has been welcomed by the surveillance market, and it can exhibit the best results under various lighting conditions. .
In particular, with dedicated infrared lighting equipment, high-resolution black-and-white images can be obtained, and monitoring of zero illuminance can be achieved (in the complete absence of light). In the near-infrared region of near-infrared 800mm-1100mm, clear black-and-white images can be achieved with infrared illumination at a suitable wavelength.
Similarly, a method for obtaining a low-light image is to increase a CCD's exposure to a single frame of image through a single-charge accumulation of charges, thereby improving the sensitivity of the camera to a single frame of image. This method can also obtain lower illuminance index, but it needs to reduce the degree of coherence of the image. Therefore, when selecting this kind of camera, it is necessary to pay attention not to use it together with the cradle as much as possible. Otherwise, the screen may be lost. There are other ways to obtain images with low illumination, but none of them can fundamentally solve the problem of illumination.
There are several points to note when choosing a low-light camera and infrared light.
First, you must choose the appropriate lens. In order to increase the sensitivity of the camera to the infrared light and the scene, a lens with a large amount of light should be used as much as possible, and attention should be paid to driving the drive level value of the large aperture as much as possible when using the auto iris or the electric two variable lens. Because generally with the lens focal length increases, the amount of light will be relatively reduced, in the selection of infrared lights to leave a certain margin, and pay attention to the infrared light indicator.
Second, the optional power supply for infrared lamps should meet the minimum electric power required by them as much as possible, and often the irradiation distance is not enough.
Third, to consider the degree of reflection of the scene being photographed, since infrared rays have the same characteristics as visible light such as reflection and refraction, therefore, if there is no good reflective environment (such as buildings, walls, signs) around the target scene, it should be considered The distance margin.
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