Patent ID: 8333670

Claim:
A system for pitching of baseball or softball comprising: a pitching room having a space which is enclosed with right and left walls, front and back walls, a ceiling, and a floor having a pitcher's mound from which a player will throw a ball and a home plate by which the thrown ball will be determined depending upon its trajectory, wherein a distance between the pitcher's mound and home plate is adaptable for a baseball or softball rule; one video camera for electronically photographing the pitching room along a longitudinal direction thereof from behind the mound by using a two-dimensional image sensor included therein; a specific-colored stripe pattern including a plurality of bars arranged at a predetermined area on and around the home plate on the floor, wherein each of the bars indicates different positions in the longitudinal direction of the area; a mirror obliquely mounted on the ceiling right above the home plate for reflecting an optical image of the home plate and stripe pattern toward the video camera, wherein a first image area of the sensor generates a first image signal which indicates a horizontal position and a vertical position of the thrown ball by directly photographing the ball, and a second image area of the sensor generates a second image signal which indicates a longitudinal position of the thrown ball by photographing the reflected optical image of the stripe pattern above which the thrown ball passes and shields the bars thereof in turn; and a computer for detecting three-dimensional position of the thrown ball based on the first and second image signals output from the video camera, and for outputting a detected signal.