What is AGC? Automatic gain control (AGC) is the function which actually increases the strength in the cameras when placed in low light conditions. AGC actually amplifies the image, increasing the video signal. As AGC is activated image static or noise increases. Eventually AGC will over compensate for the lack of light and result in a grainy or static-covered image. Another unfortunately result of AGC is increased bit rate. These rates can often use more bandwidth than the same image during daytime capture.
The solution, disable the AGC. Although this would reduce the bandwidth used, be aware that without the proper IR illumination, this feature will result in an even lower quality image. In most applications, frame rates and resolution are altered to suit the application requirements. When a security system has limited storage space, often the frame rate is reduced to allow more footage to be recorded. Modifications like these enable the user to get the most out of their equipment and by adding additional IR illuminators you can make your low-light cameras go the extra mile.
IR is a field proven answer for night time surveillance. Even though the requirements for bandwidth and resolution standards may be surprising it’s always smart to carry sufficient space in your network and drive space. This encourages risk managers to consider IR as an effective strategy for reducing storage demands.