416 results about "Tennis ball" patented technology

The invention relates to the technical field of sports match analysis, and discloses a tennis real-time AI evaluation system based on multi-view visual feature fusion, which comprises the steps of acquiring multi-angle video stream data of a tennis match, fusing multi-view data by using a time sequence diagram convolutional network to generate spatial-temporal feature representation, and constructing a time sequence cause and effect diagram model based on the fused spatial-temporal features. Key turning points of a match are identified by utilizing graph structure analysis and event influence evaluation, the influence of the turning points is verified through an anti-factual reasoning technology, and personalized tactical suggestions are generated in combination with a player feature model. According to the method, mining and understanding of a deep causal mechanism of the competition are realized by constructing the time sequence causal graph model and identifying the key turning points, and more accurate technical and tactical analysis and decision support are provided for coaches and players.

An adhesive for a tennis ball includes base rubber. The base rubber contains, as a main component thereof, liquid rubber having a number average molecular weight of not less than 10,000. The adhesive has a shear viscosity of not greater than 2,000 Pa·s. A tennis ball includes a hollow core made of a rubber material. The core includes two hemispherical half cores. The two half cores are adhered to each other by using the adhesive for a tennis ball.

Provided is a system for robotic collaboration. A first robotic device executes a first action and a second robotic device executes a second action upon the first robotic device completing the first action. An application of a communication device is paired with the first robotic device and the second robotic device. The application is configured to receive at least one input designating, for example, a hitting speed of a tennis ball, a hitting direction of a tennis ball, a unique tag of a subarea in a map of an environment, a task schedule of the first robotic or second robotic device, a driving speed, a selection of a particular user profile, an instruction to drive to a user-identified location, an instruction to turn in a left or right direction, an instruction to drive forwards or backwards, an instruction to stop moving, etc.

A method, apparatus, and system are disclosed for a robot with tennis ball gathering capabilities. A robot is configured to collect, transport, and deposit for storage tennis balls and other light-mobile sports equipment such as are used in table tennis, badminton, squash, pickleball, golf, basketball, dodgeball, floor hockey, indoor soccer, etc., to assist a player in practice without need for additional support personnel or manual ball retrieval by the player.

The embodiment of the invention discloses a real-time tennis ball speed calculation method and system based on a sliding window, and the method comprises the steps: carrying out the data buffering through employing a 35-frame first-in first-out buffer region based on a three-dimensional track point, screening effective points, calculating the instantaneous speed according to a Euclidean distance formula and an inter-frame time interval, and obtaining the real-time tennis ball speed. And through a three-frame sliding window average smooth speed curve, abnormal values are filtered by using a 10-220km / h threshold value, and ball speed calculation is realized. Through three-dimensional track points, ball speed calculation is realized through the steps of data buffering, effective point screening, instantaneous speed calculation, sliding window averaging, threshold filtering and the like. Compared with traditional single-point speed measurement, the precision is improved by about 20% by means of three-frame sliding window and three-dimensional coordinate calculation, and single-frame errors are reduced; the robustness in a complex scene is enhanced through data screening, window averaging and threshold filtering; the process is simple, the calculated amount is small, and the real-time requirement of occupational competitions is met; a fixed 35-frame buffer area optimizes resources, and memory redundancy is avoided.

The embodiment of the invention discloses a three-dimensional tennis track real-time reconstruction method and system based on multiple cameras, internal and external parameters and calibration results of the multiple cameras are utilized, respective two-dimensional pixel coordinates are converted into three-dimensional rays, and nodes are positioned in combination with a minimum distance algorithm. According to the embodiment of the invention, the real-time reconstruction of the three-dimensional track of the tennis ball is realized by virtue of the synchronous multi-camera two-dimensional image through the steps of camera accurate calibration, two-dimensional to three-dimensional ray conversion, intersection point calculation and screening, data output and the like. Compared with the prior art, the reconstruction precision is improved through accurate calibration and ray intersection screening; by means of multi-camera data synchronization and simple calculation process, data delay is reduced, and real-time performance is prominent; by means of multi-camera data redundancy and a placeholder mechanism, the robustness in a complex environment is enhanced; the output three-dimensional point data can directly support the functions of ball speed calculation and the like, and the expansibility is good.

An adhesive for a tennis ball of the present disclosure includes base rubber and a filler. The base rubber contains, as a main component thereof, liquid rubber having a number average molecular weight of not less than 10,000. The filler has an average nitrogen specific surface area of not less than 40 m2 / g. A tennis ball of the present disclosure includes a hollow core made of a rubber material. The core includes two hemispherical half cores. The two half cores are adhered to each other by using the adhesive for a tennis ball.

The invention discloses a tennis racket batting data monitoring system based on an intelligent sensor, and particularly relates to a training data monitoring technology, which comprises a four-layer collaborative architecture, an intelligent tennis racket, an intelligent bracelet and a communication module, the four-layer collaborative architecture is composed of a sensor layer, an unmanned aerial vehicle collaborative layer, an edge computing layer and a cloud / user layer; a first communication module is arranged in the unmanned aerial vehicle cooperation layer and used for receiving racket data and environment perception, and the unmanned aerial vehicle cooperation layer communicates with the sensor layer in real time. According to the tennis racket ball hitting data monitoring system based on the intelligent sensor, comprehensive monitoring and analysis of tennis ball hitting data are achieved, the system can capture detailed information at the ball hitting moment, and an accurate ball hitting quality score is generated in combination with physiological data and environmental factors of players; scientific training feedback and competition strategy support are provided for players; the self-adaptive feedback control function of the system can dynamically adjust the training intensity according to the physical state of the player, and the training effect is effectively improved.

The invention relates to the technical field of tennis recognition, in particular to a tennis recognition model based on adaptive illumination variation, which obtains an image brightness histogram by inputting an image, recognizes a region with uneven illumination distribution, and executes local contrast enhancement and global modeling, thereby effectively enhancing details of a target region, and improving the recognition accuracy. And the detectability of the tennis ball under weak light and complex light is improved. In combination with multi-scale feature extraction and classification identification, robust detection of tennis balls in different sizes and motion states is realized, and the method is suitable for multi-angle and light source interference scenes. And meanwhile, trajectory prediction and restoration are performed on detection results in continuous image frames by adopting a DeepSORT algorithm, so that the space-time continuity of target tracking is guaranteed, and target loss caused by detection interruption is avoided. The whole scheme integrates image enhancement, detection and tracking mechanisms, improves the accuracy and stability of tennis recognition under a dynamic illumination condition, and is suitable for a complex tennis outdoor competition environment.

The tennis ball launching device comprises a vehicle body, a transportation assembly and a launching assembly, the vehicle body is provided with a temporary storage bin, the temporary storage bin is used for storing tennis balls, the transportation assembly is arranged on the vehicle body, one end of the transportation assembly is communicated with the temporary storage bin, and therefore the tennis balls in the temporary storage bin can be transported through the transportation assembly; the launching assembly comprises a launching tube, a first launching part and a second launching part, the launching tube is arranged on the transportation assembly and communicates with the transportation assembly, and the launching tube can rotate around the width direction of the vehicle body relative to the vehicle body so as to adjust the launching angle of the launching tube; the first launching part and the second launching part are both arranged on the launching tube, at least parts of the first launching part and the second launching part are located in the launching tube, the first launching part is used for positioning a tennis ball, the second launching part is located on the side, away from the conveying assembly, of the first launching part, and the second launching part is used for accelerating the tennis ball. The tennis ball launching device has the advantages of being simple in structure, high in hit rate and the like.

A tennis ball serving robot and a tennis ball serving system. The tennis ball serving robot comprises a robot body (1), a ball collection basket (10), a controller (11), a ball feeding module (12), a ball launching module (13) and a direction module, wherein the controller (11) is configured to enter a customized ball serving mode in response to a customized ball serving instruction of a user; in the customized ball serving mode, the controller (11) controls, on the basis of received customized ball serving parameters, the ball feeding module (12), the ball launching module (13) and the direction module to work cooperatively, so as to realize the customized ball serving of tennis balls.

The invention discloses a ball core size detection device for tennis ball production, and relates to the technical field of sporting goods manufacturing, the ball core size detection device comprises a conveying mechanism, and the conveying mechanism comprises a conveying frame, a first conveying belt, a second conveying belt and a conveying motor. The contact type measuring probe is in contact with the surface of the ball core, corresponding thickness parameters are measured, relevant size parameters of the ball core are accurately measured, the ball core is shot and imaged through the visual camera, the ball core is annularly scanned in multiple directions through the laser scanning sensor, and position data of all points on the surface of the ball core can be collected. Through the synergistic effect of the contact type measuring probe, the visual camera and the laser scanning sensor, various size parameters of the tennis ball core can be comprehensively and accurately obtained, the detection precision is greatly improved, errors possibly caused by a single measuring mode are effectively reduced, accurate control over the size of the ball core is ensured, and the detection accuracy is improved. And the overall quality of the tennis ball core is guaranteed.

The utility model provides a tennis machine which comprises a tennis machine body, a goal module arranged on the upper side of the tennis machine body, a serving module arranged on the inner side of the tennis machine body, a camera shooting module and a processor, and the processor is in signal connection with the camera shooting module and is in driving connection with the goal module and the serving module. The first driving instruction is used for driving the goal module to execute the goal action, and the second driving instruction is used for driving the serving module to execute the serving action. According to the tennis machine, the processor is combined with the camera shooting module, instructions can be dynamically generated according to real-time image data, the requirement for manual operation is reduced, then the goal module and the serving module are accurately driven, the tennis machine can automatically adjust parameters such as the timing, the position and the angle of serving, and the service efficiency is improved. Automatic control of the tennis machine is achieved, and intelligence and interactivity of tennis training are greatly improved.

An intelligent tennis ball collecting system relates to the technical field of tennis court construction and comprises a ball sweeping device and a collecting device, the ball sweeping device comprises a first power mechanism and a ball sweeping rod, and the first power mechanism is used for being installed on a tennis court and is in transmission connection with the ball sweeping rod; the first power mechanism is used for driving the ball sweeping rod to slide in a first preset direction, so that a tennis ball on the tennis court is pushed to a preset area by the ball sweeping rod; the collecting device comprises a second power mechanism and a collecting vehicle, the second power mechanism is used for being installed on the tennis court, the second power mechanism is in transmission connection with the collecting vehicle, and the second power mechanism is used for driving the collecting vehicle to slide in the preset area in the second preset direction so that the collecting vehicle can automatically collect the tennis balls; the first preset direction is perpendicular to the second preset direction. Tennis balls can be collected in a preset area firstly, then the collecting device moves in the preset area to automatically collect the tennis balls, the area of a repeated movement area is reduced, and the tennis ball collecting efficiency is improved.

The invention discloses a rubber particle preparation method based on recycled tennis balls, an environment-friendly runway construction method and an environment-friendly runway, and belongs to the field of runway construction.The method comprises the following steps that Sa1, the recycled tennis balls with impurities removed are put into a smashing machine at a constant speed, and surface felt and a rubber inner core are smashed and separated through the smashing machine; sa2, disinfection and washing are carried out; sa3, separating the fibers from the rubber particles; sa4, naturally air-drying the fibers and the rubber particles; sa5, classifying and screening; and Sa6, classifying, sealing and storing. By the adoption of the rubber particle preparation method based on the recycled tennis balls, the environment-friendly runway construction method and the environment-friendly runway, vulcanized rubber resources in the waste tennis balls can be efficiently recycled, meanwhile, high-valued application of the resources is achieved through the following environment-friendly runway construction steps, and a complete technical closed loop of recycling, preparation and application is formed.

The invention provides an intelligent identification method and system for an air juggling action of a table tennis ball based on deep learning. The method comprises the following steps: step 1, collecting real-time video data and attitude sensor data of air juggling through a mobile terminal; 2, constructing a deep learning action recognition model; 3, optimizing the pre-trained YOLO model by adopting a transfer learning strategy; 4, according to the relative position relation between the racket and the table tennis ball, a multi-constraint-condition ball hitting judgment algorithm is designed; and 5, feeding back an identification result in real time through the mobile terminal, wherein the identification result comprises error action correction demonstration, training report generation and quantitative index display. According to the method, the computer vision technology and the recognition algorithm are utilized, real-time recognition and analysis of the air juggling actions of the teenagers at home are achieved through mobile clients such as mobile phone applets, professional training guidance and feedback are provided for the teenagers, the teenagers are helped to standardize the actions, and the training effect is improved.

The invention provides a table tennis flaw detection system and electronic equipment, which are characterized in that when a side light source is used for illuminating a table tennis ball at the same time, a high-resolution camera is used for collecting original images of the table tennis ball in parallel, a deep learning algorithm is combined for image capture and analysis, and the system preprocesses the images, extracts features and identifies and classifies flaws. Finally, results are output in parallel, automatic detection is achieved, the image contrast is remarkably enhanced and noisy points are reduced through image preprocessing, the detection precision under small flaws and complex backgrounds is improved, meanwhile, an extraction feature layer of the model is improved, flaws in imaging are accurately found out through a target detection algorithm in deep learning, and the detection accuracy is improved. According to the method, the sensitivity to tiny flaws is enhanced, the problem that feature extraction is insufficient when a traditional convolutional layer processes a complex background is solved, inference delay is reduced through non-NMS training, and therefore the detection precision and real-time performance of the whole system are improved.

The invention relates to a high-motion table tennis trajectory tracking method, which comprises the following steps of: performing motion blur correction on an original table tennis competition video, reducing motion blur, and enabling the edge and the texture of a table tennis to be clearer; then super-resolution reconstruction processing is carried out, the pixels of the table tennis balls in the frame images are increased, and the omission ratio is reduced when the improved YOLOv7 network model is adopted to carry out multi-scale small target detection on the frame images after super-resolution reconstruction subsequently; next, an improved DeepSORT algorithm is adopted to track the bounding box video frame sequence detected in the second step to generate continuous two-dimensional coordinates, tracking position errors are reduced, then a three-dimensional track is obtained through monocular depth estimation and table plane constraint reconstruction, the whole process is subjected to assembly line design, error accumulation of traditional staged processing is avoided, and the tracking accuracy is improved. Four difficulties of small targets, motion blur, shielding and complex backgrounds are jointly solved, and the average success rate gt of the whole process is obtained; 90%.

The invention discloses a real-time tennis serving score distinguishing method and device. The method comprises the steps that two-dimensional pixel coordinates of a tennis ball are recognized through synchronous frames of multiple cameras, three-dimensional coordinates of the tennis ball are constructed through a ray intersection method, a continuous three-dimensional coordinate sequence is analyzed, the frame interval is calculated according to the y-axis movement trend, and a serving starting point is determined; and then finding a height minimum value or an inflection point through a continuous three-dimensional coordinate sequence, and determining a ball serving drop point. And dynamically calculating the space coordinate range of the service area by combining the service starting point coordinate and the site reference point, distinguishing the service area boundary of a single-play mode or a double-play mode, determining the falling point state of the tennis ball according to the falling point and the service area boundary, and scoring the service party or the receiving party according to a scoring rule. According to the method, the y-axis change trend of the tennis motion is analyzed through the three-dimensional track data, and the serving starting point and the serving falling point can be accurately identified by utilizing the y-axis change trend, so that the accuracy and the efficiency of serving score judgment are greatly improved, and the fairness of a game is ensured.

The invention discloses a tennis serving recognition method and device based on a time interval, and the method comprises the steps: collecting video frames in parallel through a plurality of cameras, and carrying out the time alignment of the video frames, thereby obtaining a plurality of synchronous frames; recognizing two-dimensional pixel coordinates of the tennis ball in the multiple paths of synchronous frames, and constructing three-dimensional coordinates of the tennis ball in the space through a ray intersection method; analyzing the continuous three-dimensional coordinates of the tennis ball in the sliding window in the space, and judging the movement trend of the tennis ball on the y axis; if the motion trend on the y axis is continuous rising or falling, calculating the frame interval between the current frame and the last effective motion; finally, judging whether the frame interval is greater than an effective motion interval threshold value or not; if yes, new serving is judged, and the coordinates of the serving starting point are recorded. According to the method, the y-axis change trend of the tennis movement is analyzed through the multi-frame sliding window, the serving movement characteristics are accurately recognized in combination with the frame interval threshold value, serving and common hitting can be accurately distinguished according to the serving movement characteristics, and the misjudgment rate is effectively reduced.

Device for returning tennis balls to a ball throwing machine, with • a pipe system (20, 220) serving to collect tennis balls (4, 204) ejected by the ball throwing machine (5, 205) and returned by a player (3) over a net (2) consisting of at least one outer pipe (21) provided with at least one opening (23) and at least one inner pipe (22) rotatably mounted relative to it and provided with at least one opening (24); • a threshold ramp (10, 210) which has an ascending slope (11) and a slope (12) descending towards the pipe system (20, 220); • at least one rotary drive (25, 225) by which the pipe system (20, 220) can be converted, at least section by section, by rotating the respective inner pipe (22) from an open state enabling the receipt of tennis balls (4, 204) rolling over the threshold ramp (10, 210) to the pipe system (20, 220) into a closed state enclosing the received tennis balls (4, 204); and • a transport system (40, 240) via which the tennis balls (4, 204) collected in the pipe system (20, 220) can be transported to the ball throwing machine (5, 205).

The invention relates to the technical field of training equipment transfer, in particular to a convenient physical training equipment transfer device with a lifting function. The convenient physical training equipment transfer device with the lifting function comprises a bottom frame, a handle, a bottom frame, a lifting frame, moving wheels, a threaded rod, a return spring, a wire spool, a wire wheel, a pull rope and a driving assembly, the handle is rotationally connected to the front side of the bottom frame, the bottom frame is installed at the top of the bottom frame, a sliding groove is formed in the bottom frame, and the lifting frame is arranged in the sliding groove. The lifting frame is in sliding connection with a sliding groove in the bottom frame. The interiors of the bottom frame and the lifting frame are reasonably partitioned, basketballs, footballs and volleyballs are stored in a front side cavity according to the sizes of balls, table tennis balls are stored in a rear right side cavity, a feeding hopper and a sliding cover are designed correspondingly, storage and taking are convenient, meanwhile, badminton rackets and table tennis rackets are stored in a large-size racket frame and a small-size racket frame respectively, sports equipment is clearly classified, mutual collision and damage are avoided, and the service life of the sports equipment is prolonged. And the equipment management and taking efficiency is greatly improved.

The utility model discloses a tennis rubber mixing machine, which relates to the technical field of tennis ball production and comprises a rubber mixing machine main body, a first roller and a second roller are arranged in the rubber mixing machine main body, and a first transmission rod and a second transmission rod are arranged at one end of the second roller far away from the first roller. The cleaning cloth is arranged on the side, away from the first roller, of the second roller, the first transmission rod and the second transmission rod drive the cleaning cloth to rotate, then the cleaning cloth cleans the second roller, meanwhile, when the second roller is used, the hydraulic cylinder is started, the hydraulic cylinder drives the movable plate to move, and therefore the cleaning cloth can clean the second roller. The movable plate drives the first transmission rod and the second transmission rod to be far away from the second roller, so that the cleaning cloth is prevented from influencing normal use of the second roller, and the problems that a worker inconveniently cleans the round roller close to the inner side, and when the round roller close to the inner side is not thoroughly cleaned, the rubber mixing quality in subsequent use of the rubber mixing machine is influenced are solved.

The invention relates to the technical field of carts, and particularly discloses a folding tennis cart which comprises a bottom frame, mounting frames are fixedly mounted at the corners of the bottom frame, movable wheels are rotatably arranged on the mounting frames, an electric shear fork is arranged on the bottom frame, a transverse plate is arranged at the top of the electric shear fork, a tennis frame is arranged on the transverse plate, and the tennis frame is arranged on the tennis frame. A driving wheel is rotationally arranged on the side edge of the mounting frame, the rotating shaft end of the driving wheel and the rotating shaft end of the movable wheel are fixedly mounted, a driven wheel is rotationally arranged on the side edge of the tennis ball frame, and the driving wheel and the driven wheel are jointly sleeved with a belt in meshing transmission connection with the driving wheel and the driven wheel; according to the folding tennis cart, in the moving process of the cart, by means of linkage of a mechanical structure, tennis balls placed in the ball placing frame can be automatically arranged in order, the tedious step of manually arranging the tennis balls is omitted, the tennis balls are prevented from being stacked in a mess in the frame, the space of the ball placing frame is more reasonably utilized, and the loading capacity is guaranteed.

The present invention discloses a cloud-based intelligent table tennis training system based on YOLOv5, which relates to the field of artificial intelligence technology and is targeted at enterprise-level users. The enterprise-level users include a host computer module, a ball feeder module, a client module, a cloud-based table tennis landing point detection and scoring module, a function module for displaying detection results, an audio prompt interaction module, and a control module. The present invention uses an improved YOLO v5 model, combines the coordinate detection of table tennis balls, training scoring with multi-threaded timing signal interaction, and performs detection based on Jetson nano and a single industrial camera, saving a large amount of costs and being able to successfully complete closed-loop intelligent training. And aiming at the problem of low precision in small object detection, an exponential mean brightness equalization algorithm capable of automatically adjusting brightness and an improved YOLO v5 anchor generation mechanism are proposed, which not only improve the accuracy of model detection, but also can improve the accuracy of table tennis landing point detection, giving users a better experience.

1. The name of this design product: Tennis Ball Collector (A). 2. Purpose of this design product: used to pick up and collect tennis balls and pickleballs. 3. The key point of the design of this product lies in its shape. 4. The picture or photo that best illustrates the design points: Stereoscopic drawing 1.

1. Name of the product in this design: Ping Pong Ball Retriever Net Frame. 2. Purpose of this design: For picking up balls, such as ping-pong balls. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The invention discloses a tennis ball collecting robot and a control method, system and equipment thereof, and the method comprises the steps: obtaining a coordinate data set of scattered tennis balls in a target area in response to a received ball collecting instruction; according to the coordinate data set, coordinates of a starting tennis ball are obtained, and the starting tennis ball is configured to be a tennis ball located at the edge of the scattered tennis ball; obtaining an initial path based on an improved nearest neighbor algorithm according to the coordinates of the initial tennis ball and the coordinate data set; and according to the initial path, eliminating path intersection by a local optimization algorithm to obtain an optimal path. According to the scheme, through an innovative mixed path planning algorithm, scattered tennis balls are collected within the shortest time, the collection efficiency is remarkably improved, and the energy consumption of the robot is reduced.

The invention belongs to the technical field of sports equipment, and discloses a net bag type ball picker and a preparation method thereof.The ball picker comprises a net frame, a handheld rod and a wire pipe connector between the net frame and the handheld rod, the main body part of the net frame is formed by bending a main body steel wire, the front end of the main body steel wire is provided with a horizontal section, and the two ends of the horizontal section are provided with bending sections which are obliquely bent backwards; the bent section is backwards connected with arc-shaped sections, the two arc-shaped sections are respectively connected with a vertical section after being drawn close behind, and the two vertical sections are connected with a threaded pipe joint; auxiliary steel wires parallel to and coplanar with the main steel wires are arranged at the front ends of the arc-shaped sections, the horizontal sections and the inner sides of the bent sections, the two ends of the auxiliary steel wires are connected with the main steel wires, the arc-shaped sections and the auxiliary steel wires are connected and support a net opening of the net bag, and gaps exist between the horizontal sections and the auxiliary steel wires. The device is simple in structure, light in weight, capable of improving the ball picking efficiency, low in requirement for the environment and high in applicability; the device is firm, not easy to damage and low in maintenance cost; abrasion to the table tennis ball can be ignored; the method is simple and easy to use and low in learning cost.