| 摘要 |
<p>A motion detector system which is insensitive to environmental changes is disclosed. The invention is premised on the observation that environmental changes produce changes to the entire scene, whereas movement within a scene is localised to a sub-area within the scene. By assessing the images for changes affecting the entire scene, environmental changes can be distinguished from motion induced changes. Changes affecting the entire scene can be inhibited from generating alarms, thereby reducing false alarms. In a further embodiment, the local changes are compared to the global scene change to determine if the local change is consistent with the global change. Local changes which are inconsistent with the global change are subsequently assessed for motion detection.</p> |
