Today's surveillance cameras are pursuing high-definition picture quality, which requires not only high equipment configuration, but also high image processing capabilities. The most prominent function of surveillance cameras is wide dynamic or strong light suppression. What is the difference between surveillance camera glare suppression and wide dynamics?
The concept of the difference between strong light suppression and wide dynamics of surveillance cameras
Objectively speaking, the sensitivity of the surveillance camera to strong light suppression or wide dynamic response is sensitivity to light. Wide dynamic surveillance cameras, like night vision surveillance, are almost standard on surveillance equipment. However, from the application and principle, there are quite a few differences in the image quality. Simply put, a wide dynamic surveillance camera can handle the effects of complex light on surveillance images, but if you want to use it to capture night-time driving license plates, you may need to strengthen it.
Light changes are different from the main body. Two different monitoring techniques are easily confused when used. In principle, the difference between the two is quite obvious. It is customary to understand that the suppression of strong light is the suppression of the light source, highlighting the main object before the strong light source; that is, capturing the main object in a strong backlight environment. Wide dynamics are used where there is a large gap between light and dark, both to capture the subject and to preserve the background image.
Two different technology surveillance cameras have a very close approach to light processing. In order to highlight the main target or to reduce the effect of strong contrast of light, backlight compensation technology can be used. The former is to re-specify the metering area on the screen, and ensure accurate exposure through key metering to avoid silhouette phenomenon in the darker part. The latter divides the picture into several different areas, each of which is exposed separately.
The effect of monitoring camera's strong light suppression and wide dynamics
Although the same name is used, the principle and exposure are slightly different. In practical applications, strong light suppression is more suitable for road monitoring to identify the license plate number, and reduce the car light to see the license plate information. Usually, it will work better with white LED lights, such as high-speed toll stations and intersections. Wide dynamics are more suitable for underground parking lots or tunnels where indoor and outdoor lighting changes significantly.
Through the contrast effect of the actual image, let us look at the difference between the strong light suppression and the wide dynamic effect. The author used the flashlight to perform the glare test. It is not difficult to find that when a surveillance camera that supports the strong light suppression function turns on and off the strong light suppression, the image shows a significant change, and the digital representation is from nothing.
Compared with the wide dynamic measurement effect, before and after the function is turned on, it can display the face and detail of the main object without blurring the background into a piece of white. This function fully highlights the wide dynamic effect and preserves the subject and background.
Of course, in the surveillance camera configuration, the current wide dynamic and strong light suppression has not made a clear distinction. The surveillance cameras in the store support the strong light suppression function, and the wide dynamic effects are good. However, only the wide dynamic camera is supported, but the strong light suppression is not fully grasped. Even in the case of two similar surveillance cameras, there are still many differences in their use. Users should also clearly define the field of use when purchasing. Road monitoring is mostly for strong light suppression, and simple wide dynamic technology cannot achieve night photo capture.
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