An electronic device, mainly used in security installations, where several video cameras positioned in different locations on the premises, scan automatically, and are viewed one after the other on one monitor. When an intrusion occurs in the field-of-view of one of the cameras, a special alarm signal is sent to the scanner instantly activating the particular camera in question. It usually triggers an additional alarm device drawing attention to the event. Sophisticated scanners have internal microprocessor control, allowing them to skip or analyze every scanned source, as well as activating, when necessary, a special device, which relays a suspicious camera image to a remote location for monitoring via a telephone line.
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