With the massive number of cameras have been widely deployed in past few years, human activity analysis has attracted great interest from computer vision researchers and become a hot research area due to its promising applications in many areas such as automated visual surveillance, computer-human interactions, and motion-based identification and diagnosis. However, to detect, categorize and recognize human activity from video is a complicate and difficult problem. This book presents techniques in two topics: general human activity recognition and human activity analysis for the purpose of...