A demo tape supplied by PVI bolsters the point in the prosaic setting of a suburban parking lot. The scene appears ordinary except for a disturbing feature: Amidst the SUVs and minivans are several parked tanks and one armored behemoth rolling incongruously along. Imagine a tape of virtual Pakistani tanks rolling over the border into India pitched to news outlets as authentic, and you get a feel for the kind of trouble that deceptive imagery could stir up.
Suddenly those large stretches of programming between commercials-the actual show, that is-become available for billions of dollars worth of primetime advertising. PVI's demo tape, for instance, includes a scene in which a Microsoft Windows box appears-virtually, of course-on the shelf of Frasier Crane's studio. This kind of product placement could become more and more important as new video recording technologies such as TiVo and RePlayTV give viewers more power to edit out commercials.
With just a few minutes of video of someone talking, their system captures and stores a set of video snapshots of the way that a person's mouth-area looks and moves when saying different sets of sounds. Drawing from the resulting library of "visemes" makes it possible to depict the person seeming to say anything the producers dream up-including utterances that the subject wouldn't be caught dead saying. In one test application, computer scientist Christoph Bregler, now of Stanford University, and colleagues digitized two minutes of public-domain footage of President John F. Kennedy speaking during the Cuban missile crisis in 1962. Using the resulting viseme library, the researchers created "animations" of Kennedy's mouth saying things he never said, among them, "I never met Forrest Gump."
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