Abstract
The image cognition methodology has been applied to investigate the tennis stroke form. The eigen pattern of an image is obtained by projecting the pixel information in x-y screen coordinate to a red, green and blue coordinate systems. Tennis player worn a white shirts and pants with red, green and blue longitudinal lines. The forehand ground stroke slightly before the onset of the forwardswing was captured by digital camera and analyzed by a computer. According to our analysis, the advanced player's form has been revealed to take his racket back with more prominent upper body twisting than the beginners do. Our proposed approach is the first objective method for tennis stroke investigation, and has considerable potential for extracting the proper tennis stroke.
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