After the facial recognition system is connected to the video surveillance system, the recognition software will search for facial information in the camera's field of view. If there is a face in the field of vision, it will detect it within a fraction of a second. It uses multi-scale algorithms to search for facial images at low resolution. An algorithm is a program that provides a set of instructions to complete a specific task. The system only switches to high-resolution search after detecting a shape similar to a head.