With the development of silicon technologies, consumer electronics (CE) devices (such as personal computers, HDTV, mobile phones, digital cameras and game consoles) have become ubiquitous in daily life. These devices can provide multimedia sources for entertainment, communication, and so on. To interact with this equipment, consumers currently rely on devices such as remote controls, keyboards or control panels, which are often inconvenient, ambiguous and non-interactive. The question of how to design user interfaces for CE products that enable natural, intuitive and fun interaction is one...