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Interactive video mirrors for sports training

This paper studies gesture and speech controlled video for sports training. The goal is to combine the benefits of recording your performance with video equipment and training with a mirror. For example, a delayed camera view projected on a screen can be used to repeatedly perform and evaluate a spin kick, a move that is difficult to practice with a mirror.
 A video mirror can also be augmented with speech or gesture control for playback, recording and inspecting of individual frames. Three different interface design approaches are evaluated, based on testing with eight users that practice martial arts and acrobatics. The results suggest that an interactive video mirror can be highly useful in martial arts and other sports. The paper also introduces new kind of graphical controls that float around the user so that they can be manipulated with gestures regardless of the user's position.