An important achievement of MPEG-4 video standard is that it not only provides the tools and algorithms to improve the efficiency of MPEG-2 compression standard H.263 and the existing but also contributed key innovative solutions for new multimedia applications such as video real- time streaming to PC and phone via the Internet and wireless networks, interactive services, and multimedia access. In this book, we do not aim to provide a complete reference for MPEG-4 video as an excellent reference on existing topics. Instead, we focus on three topics that we believe form the key innovations of MPEG-4 video and that will continue to serve as an inspiration and a basis for new standards, appear, products, and technology.