Implementation method of human-computer interaction system with large screen
To avoid camera calibration in the implementation of human-computer interaction system with large screen based on binocular stereo vision,one approximate and easy method is proposed.The distance between two cameras,left camera and the left side of screen,cameras and floor,the bottom side of screen and floor are measured to find the point of floor which is imaged as the same point with fingertip based on perspective projection model.One camera is connected with the point of floor as one space line.Two lines are intersected at the three-dimension spatial coordinate of fingertip served to position two-dimensional coordinate in the large screen.Mouse click is simulated by bend and stretch of index finger achieved by fingertip detection algorithm.Users are not aware of error even if position pointed by finger is inaccurate because mouse is seen by users when they move the hand.The method proposed is easier and more convenient than calibration method due to inaccurate position not seen by users so that system can be rapidly accomplished.