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OSTECK’s Intelligent Security System is programmed to spot the upright shape of a human.
This outline analysis system uses real-time computer vision techniques. It separates a person from the visible background, creates an outline of their body shape, and models this shape into 3 separate boxed sections (head, torso, and legs). By monitoring the ratio of width to height of each of these three boxes, the system detects whether the shape it sees looks like an upright person or some other animal or object.
Scientists are currently working on a wide rage of tools that can analyze the way people walk. Sensors have been placed in carpets to pick up the characteristic way people walk, and intelligent surveillance cameras can analyze video footage to identify people by their gait, or spot someone carrying a hidden weapon.
The Science of Spying, an exhibition from 
scienceof.com