Survey on vision-based human action understanding

Human movement analysis from video sequences is an active research area in computer vision and human motion understanding is a future direction of prospective study as it has many potential application domains such as smart surveillance,human computer interface,virtual reality contend-based video indexing,etc.Human action understanding is generally divided into three fundamental sub-processes:feature extraction and motion representation,activity recognition and higher level activity and scene understanding.This paper analyzed the state-of-the-art in human action understanding in detail from three fundamental processes.At the end,provided and analyzed some detailed discussions on vital problems and future directions in human action understanding.