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Natural human-computer interaction, which helps to improve the sense of reality and immersive, is an important research issue of augmented reality. Therefore, a technique of virtual mouse based on monocular vision is presented. Bare hand gestures can be recognized only with a single camera. Firstly, chromatic information is used to segment hand area. Subsequently, according to morphological feature of fingers, fingertips are located using curvature, and error detection points are ruled out. Finally, cursor can be controlled to simulate mouse action. Experiment shows that all of the mouse actions can be simulate accurately. This method has advantages such as high precision, simple and cheap equipment, and so on.