This website presents the project of Zidong Li, Chen Fu and Chuxi Wei in the course EECS 351 (digital signal processing and analysis) in the University of Michigan. As human-computer interaction has been a main topic in signal processing and computer science, our team tries to realize some basic hand gestures via mathematical algorithms. In this project, we realize the recognition of hand gestures of paper, scissors and stone. The content of the website consists of introduction & background, framework, components, MATLAB function, algorithms, demo, applications and conclusion.