7.3. Feature Tracking
Digital artists use one computer vision technique more often than all others: pattern tracking, or template matching. Digital artists who specialize in 2D effects (rotoscoping, wire removal, compositing) use pattern tracking nearly constantly. Being able to accurately follow a feature in an image is vital for quick, accurate effects.
As an example of how this is used, consider the film Interview with the Vampire, released in 1994. In that film, the vampire Lestat, played by Tom Cruise, is cut with scissors by another vampire. These cuts are on both cheeks. The director wanted the cuts to appear on the cheeks, bleed slightly, then fade as the vampire's healing power took hold. All within one continuous shot.
Of course, one ...
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