Science series. Computers are moving into the streets and leamingto recognise our gestures, facial expressions and spoken commands.
Quentin Cooper talks to Dr Stephen McKenna of the University of Dundee's Department of Applied Computing about computers that can recognise a person's face and track their movement. How does a machine learn to recognise normal patterns of activity? How will it know when things are not right? Producer Fiona Roberts. E-MAIL: material.world@bbc.co.uk