Consider what goes through your mind when you attempt to identify an apple's variety—Granny Smith, Golden Delicious, McIntosh or Fuji, for example.
Figure 1. In the 1968 Stanley Kubrick film 2001: A Space Odyssey, the spaceship's computer not only controls the ship and converses with the crew, but in a crucial plot twist also reads lips. Here (in a clip from the popular home-video version) HAL has begun to act strangely, and astronauts Dave and Frank plot to turn the computer off while ensconced in an escape pod. But HAL reads their conversation through the glass. Thirty years after the movie, computerized speech recognition is on the verge of becoming a reality. The authors find that similar algorithms explain how visual and auditory information may be integrated by the senses and how computers can use visual information in speechreading.
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