| 摘要 |
The device has a video camera and an evaluation circuit with a background image memory and a monitoring circuit with at least one object image memory that evaluates the camera image for whether part of the background image is modified by an object, compares detected objects with stored object images and generates an alarm signal if the detected object either corresponds to a stored object or does not correspond to any stored objects. The device has a video camera (34) and an evaluation circuit (50) with a background image memory (58) and a monitoring circuit (76) that generates an alarm signal if the camera image differs from the background image. The evaluation circuit has at least one object image memory and evaluates the camera image for whether part of the background image is modified by an object, compares detected objects (40,42,44,46) with stored object images and generates an alarm signal if the detected object either corresponds to a stored object or does not correspond to any stored objects.
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