BULLSEYE is a flexible, computer input device that operates by generating and analyzing the image of known “props” at 60 Hz to determine position, orientation, and user-controlled internal state variables. The compact device, containing both the camera and processing engine, has been built and fielded. This paper provides an overview of the concept and hardware, then examines the problems and design strategies associated with the interrelated areas of the environment, prop design, and color detection.

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.