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(1) Improve the backlight by adjusting the installation position. By adjusting the installation position of the entrance camera and avoid direct sunlight from the outside, it can greatly improve the back light of the entrance and exit, such as the Shanghai Huating Hotel on the entrance and exit sides of the hall. A camera was installed to monitor people entering and exiting; ICBC Shanghai Branch inverted the cameras that monitored the entrances and exits, so that the camera's lens was facing the person walking out of the network. (In the case of serious backlighting, the installation method is better than the camera facing the entrance. The installation is better, but it should be noted that if the above flipping method is adopted, for a network with more than two entrances and exits, the installation direction of the cameras should be the same, otherwise a loophole will appear. Both of them can solve the back light problem better. There are many outlets now. The size of business halls is not large. Some entrances and exits are cash counters. There are not many locations available for installing cameras. In this case, we need to pay attention to solving the problem of installation locations and try to avoid The camera is installed facing the entrance and exit. We say that the entrance should be equipped with a camera. There is no provision on which position the camera for monitoring the entrance and exit must be installed. It should be said that it is important to see the effect and to see the quality of the object.
(2) Improve backlighting by selecting cameras with corresponding functions. Using a hyperdynamic camera or a camera with background compensation is also a way to improve the backlight phenomenon at the entrance and exit. General camera has AGC (automatic gain control) function, that is, strong and weak signals automatically improve the camera's internal amplification gain, the strong signal automatically reduces the camera's internal amplifier gain, so that the final output signal does not change with the input signal changes, the output The signal amplitude remains basically the same function, but this camera's automatic adjustment function is limited. Once a strong signal (such as a strong backlight phenomenon) exceeds the normal camera automatic adjustment range, the amplifier is saturated, Without automatic adjustment, a blurry white spot (back light phenomenon) appears on the monitor screen. The dynamic range of the hyperdynamic camera is larger than that of a normal camera. We can feel through practice that when a target object with rich picture levels appears in the scene, when the target object is captured by an ordinary camera, there are many picture levels obtained, so the problem of backlit light with high contrast between the pictures is selected. Can also play a role in improving. The backlighting phenomenon at entrances and exits is often a very bright background and a very dark foreground target in the scene, and the background and target position remain basically unchanged. Only cameras with BLC function (backlight compensation function) can be used. The AGC operating point is determined by averaging a certain area of ​​the site. If the foreground target is located in this area, the clarity of the foreground target is expected to increase.
(3) By improving the illumination of the indoor light source, the phenomenon of back light is improved; by improving the illumination of the indoor light source, it is also a way to improve the phenomenon of back light. The phenomenon of back light appears in the image, which is mainly caused by the strong contrast of light intensity in the field of view. The cameras installed at the entrance and exit have strong outdoor light in the monitored area and weak indoor lighting, resulting in a strong contrast between the black and white levels of the image. In this way, if the illuminance of the indoor light source is increased, the indoor light is enhanced. Reducing the contrast with the outside light can also improve the backlight phenomenon. Improve or reduce the entrance to the back light phenomenon, there are some other auxiliary methods, such as laying some carpet on the ground to prevent the reflection of light on the ground, in the window near the entrance and exit, blinds to block direct sunlight, etc., are to help improve the phenomenon of backlight Methods. The backlighting phenomenon at the entrances and exits is a prominent issue, and the solution to this problem has not yet found a most thorough and effective method. The three methods described above have a certain effect on improving the phenomenon of backlighting and need to be Comprehensive application.
Some Ways to Improve Camera Backlighting
When installing video cameras at outlets and outlets, the biggest problem is that due to improper installation of the camera, backlighting will occur on the monitoring screen. In this regard, I believe that there are three ways to improve: First, avoid direct sunlight at the installation location. The second is to use a camera with a corresponding improvement function; third is to improve the indoor light source illumination to reduce the contrast with the outdoor light.