A perimeter security system based on video analytics operates by “seeing” targets that move into a camera’s detection area. Unfortunately the practical real-life detection range of a camera doesn’t always match the manufacturer’s published specifications.
This means it’s up to the integrator to test and determine the camera’s true detection distances. Knowing the camera’s true range lets you then design a dependable system with no coverage gaps. Otherwise, you will end up with a perimeter security system with gaping holes that allow intruders to pass through undetected.
The best practice is to measure the distance at which the camera can automatically detect a person walking “inbound” or directly toward the camera. A person walking toward the camera produces very little motion (compared with a person walking across the field of view), which makes the target harder for a smart camera to detect at longer ranges. This is the most difficult detection task for a smart camera, but measuring the detection range in this manner avoids any gaps in coverage.
It’s just as likely that an intruder will enter a secure area walking towards the camera as across the camera’s field of view. A solid design must be prepared for both situations. For this reason, inbound measurement should be the only method used when determining the range of a smart perimeter camera.