virtual reality and computer vision

One method for human to computer interaction is "computer vision" wherein high-order analysis of camera images of human motion via computer enables the computer system to distinguish key configurations and patterns of body movement. Nonetheless, this technology has limitations. The parts of interest of the human body must all be visible by the camera. They should not be obscured by things in the world or by other portions of the body. Some gestures are overlapping in themselves. This method is also limited by lighting conditions. You may also see 3D Visual Data Mining for more VR-related material.

Virtual Reality is a three-dimensional computer-generated world within which a human participant can sense and manipulate things three dimensionally, right away, and in a similar way to human communication with elements in a genuine environment. Interaction with things in virtual reality can vary by scope. Scope considers the number of sensory methods (vision, hearing, touch, etc) and control modalities (e.g. body movement, voice recognition, etc.) that are involved. This communication can also vary concerning completeness (e.g. extent of sight, sound range, range of haptic engagement, etc.) and resolution (precision of sight, hearing, body movement, etc.). The site on Virtual Tours Lowell, Massachusetts for more on this topic.

Virtual Reality TVs discusses this material from another angle.