Real Batting in an Immersive and Interactive Virtual Reality Baseball Game

• Main Authors: Hsieh, Ning, 謝寧
• Other Authors: Zen Chen
• Format: Others
• Language: zh-TW
• Published: 1997
• Online Access: http://ndltd.ncl.edu.tw/handle/20249894117637667533

碩士 === 國立交通大學 === 資訊工程學系 === 85 === The thesis is concerned with a virtual reality baseball system in which a real person can swing a real bat to hit the virtual baseball seen on the worn HMD(Head-Mounted Display). The main purpose is to bring in both the theory and technique of computer vision into virtual reality and, with the help of basic image processing skills, to design and implement a game. The game aims at emphasizing the real person, and real bat immersed in virtual world and the interaction between them.Our method uses two properly mounted TV cameras and carries out camera calibration. A user enters in the common view field of the two cameras, then judges how the baseball, generated by virtual reality skills and seen from the stereo HMD worn, is flying and decides how to swing the bat in his hands. Through two frame grabbers, we store the image data of the real person''s swinging from the two respective TV cameras into the memory instantly.By means of simple and fast image processing techniques, we pick up the feature points of the bat, and calculate the bat position in 3D world coordinate system. Then we send the bat position from the image processing platform to the VR platform via network, and test its collision with the 3D virtual baseball at all instants. If hit, we estimate whether the ball is a fly ball, a line drive, or a ground ball? A fair or a foul? All these judgements are based on the striking force and position.The thesis not only describes the theory of the whole system and its implementation, but also reports the experiments about the user* s play in the actual game.