A new system combines on- and off-line computer vision with head tracking and image synthesis to form a “virtual batting cage” where a batter swings a real baseball bat at a synthetic recreation of an actual pitch, enabling postswing viewing and analysis. The system merges completely synthetic, completely real, and mixed-domain elements. Careful attention to timing is required to combine these elements. In addition to the obvious training application, the system suggests future model-based broadcast communication systems.

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