1788 results about "Tennis ball" patented technology

The invention relates to a cooperative construction method for enhancing a realistic table-tennis system based on real rackets. The method comprises the following steps of: detecting and tracking a real table-tennis racket by utilizing the color characteristics according to a video image acquired by the system; designing and realizing the virtual-real three-dimensional registration of a virtual scene and a real scene, mapping the virtual scene to a video image coordinate system of the real rackets, participator users and real environment; designing and realizing the collision detection between a virtual table-tennis ball and objects, such as the real rackets, a virtual table-tennis table, a virtual table-tennis net, and the like according to the motion information of the real rackets and confirming and representing the motion trajectory of the virtual table-tennis ball after collision; and providing a finite state machine and a message-processing mechanism, controlling the conversion of various states of the table-tennis system in the operation process and ensuring a plurality of users to have the same table-tennis motion experience. The cooperative construction method can be widely applied to the fields, such as interactive digital entertainment, sports research, training simulation, remote education and training, and the like.

The invention discloses a real-time processing system for accurately measuring and predicting the flight path of a table tennis ball at high speed which is composed of more than two cameras, a synchronization device controlling a plurality of cameras to synchronously acquire images, an image data acquisition transmission device, a main control computer, system environment and an external display screen; wherein, the synchronization device is used for controlling a plurality of cameras to synchronously acquire images, vision software operates in the system environment, the system can accurately measure the flight path of the table tennis ball at high speed and has the real-time processing function, and is applied to automation control systems, training of table tennis athletes, analysis of batting data, automatic referee system for table tennis game, network live broadcast and television relay.

A method and system to analyze sports motions using the motion sensors of a mobile device, such as a smart phone, is provided. This method uses the mobile device motion sensor output to define the impact point with a virtual object, such as a golf ball, baseball or tennis ball. The motion sensor signature of the sports motion is analyzed for characteristics, specific to each type of sports motion. A method is disclosed using multiple sensors outputs in a mobile device to compute the impact point with a virtual object, such as a golf ball, baseball, tennis ball. Further, a method is disclosed where moving virtual sports objects interact with virtual sports motions and the responsive outputs are displayed on the mobile device and/or any Web-enabled display device.

The invention relates to a movable tennis skill training simulator which comprises a support, a tennis net, an elastic wall, a net pulling ring, a photoelectric counter regulation groove, a photoelectric counter and a tennis ball collection mesh bag. Functions and instructions of the movable tennis skill training simulator are as follows: regulating the position of the photoelectric counter according to different ball hitting skills; during training, hitting tennis balls into a drop point area on the elastic wall according to actions required by a coach, hitting the tennis balls again when the hit tennis balls are rebound to the ball hitting position of a trainee, and continuously practicing the set ball hitting skills and actions in cycles; after training, reading hitting times of the elastic wall hit within the drop point area, and performing statistics and evaluation on the training result, wherein the hitting times are recorded by the photoelectric counter; during training, hitting the tennis balls to the tennis net to enable the tennis balls to enter the tennis ball collection mesh bag under the tennis net, wherein the tennis balls are intercepted by tennis ball interception nets arranged on two sides of the simulator if the tennis balls fly laterally without hitting the elastic wall. The movable tennis skill training simulator has the advantages of being complete in function, simple in structure, less in investment and capable of moving at will.

There is provided a method and a system for registration of real time position of tennis ball relatively to boundary lines on tennis court. The method and system comprise sensitive to near-infrared radiation at least one video camera, outputting video image of court and the method and system further include at least one point source of near-infrared radiation, illuminating tennis court and displaced relatively to the video camera. It is suggested a simple and inexpensive way of determining if a tennis ball bounces in or out of court by determining point of intersection of trajectories of the tennis ball and its shade from near-infrared radiation and comparing the position of the determined point of intersection with previously calibrated boundary lines of court.

A robot for collecting table tennis balls on the ground includes a body, a rotor mounted at a front of the body, a driving module mounted on the body, and a control device. The body is configured for receiving the picked table tennis balls therein. The driving module drives the body to travel and drives the rotor to rotate for picking up the table tennis balls. The control device is configured for controlling the driving module to drive the robot to travel on the ground along a predetermined route.

A table tennis ball service machine includes a ball-collecting unit, a control valve and a ball service mechanism. The ball-collecting unit has a ball-collecting groove connected with ping pong table and having its rear side provided with a blocking net and its lower side connected with a ball-collecting tube and a ball-feeding tube. The control valve is positioned at the lower end of the ball-collecting tube for controlling dropping of balls. The ball service mechanism connected with the upper side of the ball-feeding tube includes a ball service tube, a blower, a support frame, a universal joint, a cam and a motor. The ball serving tube has its outer end extending through the blocking net and formed with an outlet and its rear side formed with an inlet communicating with the ball-feeding tube. Thus, the ball serving speed and the angle can be controlled.

The invention discloses an automatic tennis ball transceiver, which comprises a frame with front and rear wheels, and a ball receiving mechanism, a ball driving mechanism and a ball serving mechanism sequentially arranged on the frame. The ball serving mechanism comprises a first ball receiving belt pulley, a second ball receiving belt pulley and a ball guiding partition board, wherein the first ball receiving belt pulley is coaxial with the front wheel of the frame, the first ball receiving belt pulley is connected with the second ball receiving belt pulley through a belt, and the second ball receiving belt pulley is provided with three ball flicking blades in 120-degree angles; the ball driving mechanism comprises a first ball driving belt pulley, a second ball driving belt pulley and a conveyor belt, wherein the ball driving belt pulleys are connected with the second ball receiving belt pulley; and one end of the ball guiding partition board at the second ball receiving belt pulley is a sliding tackle end, and the ball guiding partition board is provided with an arc surface for guiding a tennis ball to the underside of the first ball driving belt pulley. The automatic tennis ball transceiver has simple structure, is convenient to use, energy-saving and environment-friendly, realizes integration of ball receiving, ball driving and ball serving, effectively saves the ball transceiving time of a tennis ball sportsman, and improves the efficiency of sports exercise.

Devices, systems, and methods for adding a coupling system onto the existing accessory thread on a rifle barrel, which allows for existing terminal muzzle devices (such as but not limited to muzzle brakes, flash hiders, muzzle suppressors, and the like) to remain on the barrel and not be removed when accessory devices, such as but not limited to silencers, percussion shrouds, golf ball launchers, tennis ball launchers, cartridge oil filters, and the like, are used with threaded gun barrels.

The invention is directed on the one hand to a celluloid-free table-tennis ball, preferably having a diameter of 38.5 to 48 mm, a weight of between 2.0 and 4.5 grams and a shell thickness (approximately) of between 0.20 mm and 1.30 mm, the shell being composed of plastic whose principal constituent is an organic, non-crosslinked polymer which in its main chain has not only carbon atoms but also heteroatoms; and on the other hand also to a method of manufacturing a table-tennis ball of this kind, where mostly in a first step two or more shell parts are manufactured, these shell parts being assembled in a subsequent step.

A tennis ball collection, dispensing, and transporting apparatus is disclosed. The apparatus includes a ball collection hopper for collecting tennis balls by a wheel-mounted sweeping apparatus. The ball collection hopper includes a forward facing opening for receiving tennis balls collected by the sweeping apparatus, for directing tennis balls over a one-way deflection panel and into the interior of the ball collection hopper. The deflection panel prevents collected tennis balls from accessing the sweeping apparatus and jamming the collection device during use, as well as retaining collected tennis balls during transport on and off the tennis court, as well as for securing the balls within the hopper when being dispensed.

Sport ball training devices and methods for releasably holding a tennis ball or other sport ball at an appropriate height for the practice of striking the ball, either directly or indirectly with a racket or the like. An embodiment may have a support device with a base and an adjustable vertical tubular assembly for the support of a transverse arm from which a ball sling is suspended. A retainer member of the ball sling circumferentially holds a sport ball. An embodiment of the retainer member may be made from an elastometric material that lightly squeezes the ball with sufficient force to restrain it, but releases easily when the ball is hit so that the trajectory of the ball is not affected by the presence of the retainer member nor is the racquet significantly affected by the presence of the ball sling generally.

An improved ball rebound device which will deliver a playground type ball such as a soccer ball, basketball, or kick ball which is propelled against the device, back to the user with surprising speed and distance. This ball rebound device utilizes a series of monofilament nylon elastic cords which are independently stung back and forth in a basket-weave fashion within a rectangular frame as a tennis racket is strung. This enables the device to more efficiently convert the kinetic energy of the ball into a powerful rebound back to the user. One embodiment of the device has within its frame the capability for adjustment of the tension of the cords to keep them operating at the desired tension. Another embodiment of the device has the capability for its frame to be adjustably oriented at various angles to the user to better suit the individual practice needs of the user.

The invention relates to an intelligent integrated tennis ball picking robot which comprises an information acquisition system, a control system, an execution system, a moving carrier and a picking device, wherein the information acquisition system comprises a camera, an infrared detector and an ultrasonic distance measurer; the control system comprises an image processing module and a master control module; the execution system comprises a speed regulating module, a motor driving module, a wheel motor, a ball picking motor, a ball deflecting motor and a wireless receiving/transmitting module; the camera is connected with the master control module through the image processing module and transmits the continuously-shot site image data signals to the control system; the infrared detector and the ultrasonic distance measurer are connected with the master control module respectively and transmit the data signals including positions of balls in the moving carrier and barriers information to the control system; and the control system processes and analyzes the data and then outputs respective control signals to the motor driving module in the execution system to drive the wheel motor, the ball picking motor and the ball deflecting motor respectively to complete the carrier moving operation and the picking operation.

The invention discloses an intelligent tennis training system, wherein a sensor is arranged on a ball hitting wall, a monitoring frame is arranged on a playground, and a control machine cabinet is used for controlling data information, in this way, personal exercises, entertainments and technical level trainings can be provided, returned balls can be automatically collected to be circularly used by a pitching machine, a ball can be intelligently served according to a mode selected by a host machine; and the ball returning line of a trainer, the ball speed and the dropping point data acquisition can be controlled, so that the targeted trainings of multiple ball catching technologies are achieved, the targeted competing training of an athlete and a professional intelligent system can be achieved, and the analysis and evaluation of the training result of the athlete can be achieved.

The invention discloses a virtual simulation system and method of an antagonistic event with a net based on three-dimensional multi-image display. The system comprises a network connection module, a game logic module, an interaction control module, a physical engine module, a three-dimensional rendering module and a dual-image projection display module, wherein the network connection module comprises a server sub-module and a client sub-module and is used for network communication and data transmission; the game logic module is used for storing game rules, controlling the play of character animation and performing mapping by position; the interaction control module is used for controlling corresponding game characters in a virtual tennis game scene to move and shooting three-dimensional images of different sight points; the physical engine module is used for efficiently and vividly simulating the physical effects of a tennis ball, such as rebound and collision through a physical engine and enabling the game scene to be relatively real and vivid. According to the system, the three-dimensional multi-image display operation can be performed on a same display screen, and the same game scene can be rendered in real time based on different sight angles.

A swing analyzing apparatus 2 includes:

a three-axis acceleration sensor 28 attached to a tennis racket, for measuring accelerations in the directions of three axes when a swing for hitting a tennis ball is taken with the tennis racket;

a three-axis gyro sensor 30 attached to the tennis racket, for measuring angular speeds about the three axes; and

an analyzing device 8. The analyzing device 8 has a receiving function to receive data regarding the accelerations and the angular speeds from the three-axis acceleration sensor 28 and the three-axis gyro sensor 30; a coordinate axis conversion function to convert relative coordinate axes that are the three axes for the accelerations into absolute coordinate axes on the basis of the angular speeds; and a calculation function to calculate an index of the swing on the basis of accelerations resulting from the coordinate axis conversion.

The invention discloses an intelligent ball picking, serving and cleaning device with a photovoltaic power. The intelligent ball picking, serving and cleaning device with the photovoltaic power comprises a trolley, wherein a control module, a photovoltaic tracing device, a storage cabin, a mechanical arm, a camera module and a ball serving device are mounted on the trolley; the control module is connected with the photovoltaic tracing device for controlling the strongest light intensity of the photovoltaic tracing device; the control module is connected with the mechanical arm for controlling the mechanical arm to place the picked garbage and balls in the storage cabin; the control module is connected with the camera module for controlling the camera module to automatically classify and identify the scanned balls and garbage; the control module is connected with the ball serving device for controlling the serving device to serve different balls. The intelligent ball picking, serving and cleaning device with the photovoltaic power is capable of picking the garbage and balls at playgrounds and other fields and also capable of classifying the balls and serving tennis balls, baseballs, golf balls and other balls for a sportsman in training.

A tennis racket including a vibration damping member located in the vicinity of a position of a racket frame at which a large amplitude is generated when the tennis racket hits a tennis ball. The vibration damping member includes a mass adding part, such as a bracket assembly, having a portion extending in a widthwise direction of the tennis racket and a portion extending in a thickness direction thereof such that both portions are either integral or unintegral with each other; a viscoelastic material; a spring; or/and a damper each for connecting the mass adding part to the racket frame. The vibration damping member absorbs a vibration in an in-plane and an out-of-plane direction of the racket frame, and longitudinal and rotational impacts to be applied to a handle portion of the tennis racket.

The invention discloses a service device for tennis ball hitting training. The service device comprises a bearing plate, wherein a vertical fixed plate is vertically fixedly arranged on the bearing plate; a storage groove is vertically fixedly arranged in a horizontal plate; a vertical conveying pipe, which penetrates the horizontal plate, is arranged at the lower end of the storage groove in a vertical communicating mode; a horizontal conveying pipe is horizontally fixedly arranged on the bearing plate via a supporting pillar; an incomplete gear, which gets into meshed connection to a gear rack II, is rotatably arranged at the lower side of the gear rack II; a reset spring I is horizontally fixedly arranged between a sleeve plate and the vertical fixed plate; a screw lead gets into horizontal threaded connection to the sleeve plate in a penetrating mode; the left end of the screw lead is rotatably connected to a limiting plate; and a twisting block is fixedly arranged at the right endof the screw lead. According to the service device provided by the invention, impact throwing of tennis ball is achieved by rapid sliding of a push plate leftwards in the horizontal conveying pipe, so that workload of manual ball throwing is greatly reduced; and meanwhile, throwing force of the tennis ball can be adjusted, so that operations become simple and convenient, and athletes are facilitated in tennis ball hitting training to a great extent.

The present invention pertains generally to a ball throwing apparatus. More specifically, the present invention pertains to a tennis ball throwing apparatus with an elongated shaft that may be folded in half. The shaft of the throwing apparatus has a claw-like structure with a plurality of elongate members attached or formed at one end for releasing the ball when throwing and picking up a ball without the user making direct contact with the ball and a partial spherical structure attached to or formed at the opposite end of the shaft for storing an extra ball.

The invention relates to an omnidirectional mobile tennis ball serving robot and a use method thereof, which comprises a four-wheel drive mobile chassis, a ball storage device for storing tennis balls is installed on the top of the four-wheel drive mobile chassis, and a ball storage device is installed on the bottom of the ball storage device. The ball sending device, the outlet of the ball sending device is connected with the ball sending pipe, the outlet of the ball sending pipe is connected with the ball-serving mechanism, and it also includes electric control hardware and electric control software. It can simulate a real person's serve to meet the training needs of athletes and tennis fans.