Abstract: The present invention is a system for pitching of baseball or softball to enjoy virtual game, the system includes a pitching room having a 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; a video camera for photographing the pitching room along the longitudinal direction thereof from the back of the mound by using a two-dimensional image sensor included therein; a stripe pattern arranged at a predetermined area including the home plate on the floor, wherein the stripe pattern indicates different positions in the longitudinal direction of the area; a mirror obliquely mounted on the ceiling right above the home plate for reflecting the optical image of the home plate and stripe pattern toward the video camera; and a computer for detecting three-dimensional position of the thrown ball based on the image signal output from the video camera photographing both of the thrown ball and the optical image of the stripe pattern above w

Abstract: The present invention is a system for pitching of baseball or softball to enjoy virtual game, the system includes a pitching room having a 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; a video camera for photographing the pitching room along the longitudinal direction thereof from the back of the mound by using a two-dimensional image sensor included therein; a stripe pattern arranged at a predetermined area including the home plate on the floor, wherein the stripe pattern indicates different positions in the longitudinal direction of the area; a mirror obliquely mounted on the ceiling right above the home plate for reflecting the optical image of the home plate and stripe pattern toward the video camera; and a computer for detecting three-dimensional position of the thrown ball based on the image signal output from the video camera photographing both of the thrown ball and the optical image of the stripe pattern above w

Abstract: A digital comparator includes a plurality of bit comparators. Each bit comparator generates a matching signal when the values between a first 1 bit data and a second 1 bit data are equal, while a mismatch signal when the values between the first 1 bit data and the second 1 bit data are unequal; receives a matching signal or a mismatch signal transmitted from an upper bit comparator or a fixed signal generated by an electronics component; transmits a mismatch signal to a lower bit comparator when generating the mismatch signal or the receiving the mismatch signal, while a matching signal to the lower bit comparator when generating the matching signal and receiving the matching signal or the fixed signal; and outputs the first 1 bit data being input to the input circuit when generating the mismatch signal and receiving the matching signal or the fixed signal.

Abstract: The present invention is a system for pitching of baseball to enjoy virtual game, throwing a ball from a mound plate in a pitching room. The system includes a fiber net member placed in the back of the home plate and held a tension by the ceiling, floor, and right and left walls, for flexibly catching the thrown ball and for dropping it on the floor; a plurality of narrow light sources arranged on the ceiling, floor, right wall, or left wall at different positions between the mound and home plate, wherein each light source emits slit light to the opposite side; a video camera arranged on the front wall, for photographing optical images reflected by the thrown ball which in turn passes through the positions corresponding to each light source and for outputting image signal; and a computer for detecting three-dimensional positions of the thrown ball based on the image signal output from the video camera and for outputting detecting signal.