How to solve the explosion proof camera backlight problem?
In our usual use of surveillance cameras often encounter backlighting phenomenon, through the selection of surveillance cameras with the appropriate features to improve the backlighting phenomenon. When the camera is installed, especially when installed at the entrance of the network, the main problem encountered is the installation of improper location, you will see a backlight phenomenon. In fact, three ways can be used to improve.
1、By adjusting the installation position
By adjusting the installation location of the entrance and exit cameras, try to avoid direct sunlight from the outside world, can improve the backlight of the entrance and exit to a large extent, now there are many outlets, the business hall area is not large, some into the entrance and exit is the cash counter area, available for the installation of the camera is not much, so that we need to pay attention to solve the problem of the location of the installation, and try to avoid the camera to the entrance and exit! Installation, we talk about the entrance and exit to install the camera, and does not provide for the monitoring of the entrance and exit of the camera must be installed in which a position, it should be said that it is important to look at the effect, look at the quality of the physical.
2、By improving the indoor light source illumination
By improving the illumination of the indoor light source is also a way to improve the backlight phenomenon, the image of the backlight phenomenon, mainly field of view range of light illumination intensity contrast caused by too much. Installed at the entrance and exit of the surveillance camera, the monitoring range of the outdoor light is strong, indoor light is weak, the formation of the image black and white level contrast is too strong. In this way, if the indoor light is enhanced by increasing the illumination of the indoor light source. Reduce the contrast with the outside light, can also improve the backlight phenomenon.
Entrance and exit of the backlight phenomenon is a more prominent problem, and the solution to this problem, at present has not found a most thorough and effective way. Improve or reduce the backlighting phenomenon, there are some other auxiliary methods, such as laying some carpet on the ground to prevent the reflection of the ground light, in close proximity to the windows near the entrance, curtains to block the direct sunlight, etc., are auxiliary to improve the backlighting phenomenon of the method.
3、By selecting the appropriate function of the camera
Explosion-proof camera inside two kinds of cameras are able to better solve the problem of camera backlighting, a camera with backlight compensation, a wide dynamic camera. Backlight compensation, also known as backlight compensation, is the picture is divided into several different areas, each area is exposed separately. In some applications, the field of view may contain a very bright region, while the contained subject is surrounded by the bright field, the picture is dim and levelless. At this point, since the signal level detected by the AGC is not low, the amplifier gain is very low and cannot improve the brightness of the subject of the picture. When backlight compensation is introduced, the camera detects only a sub-region of the entire field of view, and determines the operating point of the AGC circuitry by averaging the signal level in this region.
