What way does a motion detection spy cam work?

Does it only power up when motion is detected or what?What way does a motion detection spy cam work?I assume you are asking about a camera or webcam, likely connected to a computer. The system must always be up and running. The camera is acquiring images, and passing them to a software that does the motion detection. The software compares video frames, performs actions upon detection.



If the camera or computer goes into standby, the motion detection effectively stops.What way does a motion detection spy cam work?If by 'motion detector spy cam', you mean a motion detector, like those used on automatic doors (less exciting don't you think?), they work in several different ways. There are ultrasonic ones which work like sonar, bouncing out sound waves and monitoring the reflections to see if the environment is changing, and radar ones that work on a similar principle but with microwave pulses, like a police speed gun.

You might possible have meant infra-red although that's more commonly thought of as being used for night vision rather than motion detection.