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486 results about "Tennis ball" patented technology

Tennis machine and control method thereof

The invention provides a tennis machine and a control method thereof.The tennis machine comprises a camera device, a control device, a goal device and a serving device, the tennis machine captures image data of a user in real time through the camera device and transmits the image data to the control device, so that the control device classifies the image data based on indication action information, and sends the classified image data to the control device; and further determining scoring parameters for controlling the scoring device to transmit the tennis balls and serving parameters for controlling the serving device to serve the tennis balls according to the image data. According to the scheme provided by the invention, the image data of the user can be captured in real time through the camera device, the action of the user can be accurately judged, and the goal parameter and the serving parameter are intelligently determined by the control device according to different image data, so that intelligent adjustment is performed based on the real-time demand of the user; the interactivity and personalization of training by using the tennis machine are improved, the training efficiency and quality can be effectively improved, and the training effect and the use experience of the user are greatly optimized.
Owner:SHENZHEN ENHANCED POWER TECH CO LTD

Tennis ball real-time AI evaluation system based on multi-view visual feature fusion

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.
Owner:SHENZHEN MINGSHI INTELLIGENT TECHNOLOGY CO LTD

Adhesive for tennis ball

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.
Owner:SUMITOMO RUBBER INDUSTRIES LTD

Tennis playing robotic device

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.
Owner:AI INC

Robot with tennis ball gathering capabilities

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.
Owner:CLUTTERBOT INC

Real-time tennis ball speed calculation method and system based on sliding window

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.
Owner:BEIJING GIVERNY SPORTS TECHNOLOGY CO LTD

Three-dimensional tennis track real-time reconstruction method and system based on multiple cameras

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.
Owner:BEIJING GIVERNY SPORTS TECHNOLOGY CO LTD

Adhesive for tennis ball

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.
Owner:SUMITOMO RUBBER INDUSTRIES LTD

Tennis racket ball hitting data monitoring system based on intelligent sensor

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.
Owner:BAODING YIWANG WUQIAN TECHNOLOGY CO LTD

Table tennis recognition system based on YOLOv8 and edge computing device deployment method

A table tennis recognition system based on YOLOv8 and an edge computing device deployment method belong to the technical field of computer vision, the table tennis recognition system comprises a camera, an edge computing device and a pitching machine, the camera and the pitching machine are connected with the edge computing device, and the edge computing device is connected with a main control center. The table tennis ball recognition system comprises the following steps: S1, image acquisition; s2, image preprocessing; s3, the YOLOv8 network is improved; s4, training a network model; s5, carrying out RKNN conversion on the model, and carrying out quantization processing; and S6, deploying to Orange Pi5Plus (Orange Pi5Plus), and carrying out multi-thread real-time detection on the table tennis ball. According to the system, a training mode instruction is received according to the specific requirement of a user, and the ball serving machine is controlled to serve balls according to a specified mode after the training mode instruction is processed by orange pie 5Plus; a personalized serving strategy can be customized according to the actual training performance of the user, and the coordinate position of the ball is displayed in real time; according to the invention, high-efficiency and low-cost real-time table tennis ball detection and analysis are realized.
Owner:DALIAN NATIONALITIES UNIVERSITY

Tennis ball recognition model based on adaptive illumination change

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.
Owner:GUANGDONG YUEYUN TECH CO LTD

Tennis ball launching device

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.
Owner:CHINA UNIV OF PETROLEUM (BEIJING)

Tennis ball serving robot and tennis ball serving system

PCT designated stageWO2026091528A1Racket sportsSimulationMechanical engineering
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.
Owner:SHANGHAI FUTURE MIND CO LTD

Ball core size detection device for tennis ball production and detection method thereof

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.
Owner:ANHUI SHENGDA SPORTING CO LTD

Tennis machine

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.
Owner:SHENZHEN ENHANCED POWER TECH CO LTD

Intelligent tennis ball collecting system

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.
Owner:BEIJING YINGBAIDI EMBODIED TECHNOLOGY DEVELOPMENT CO LTD

Rubber particle preparation method based on recycled tennis balls, environment-friendly runway construction method and environment-friendly runway

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.
Owner:BEIJING UNIV OF TECH

Tennis ball detection method applied to video stream and based on deep learning

The invention discloses a deep learning-based tennis ball detection method applied to a video stream. The method comprises the following steps: S10, a data preprocessing stage: performing data preprocessing on a time sequence video stream to obtain training data; s20, a model training stage: stacking a continuous picture sequence and a background frame image in the training data pair through a stacking module to form network training input, performing multi-layer down-sampling through an encoder structure to obtain a feature vector fused with time sequence information, performing processing through a time attention module to improve the enhancement of a small target object, and performing model training; restoring a corresponding thermodynamic diagram of the input time sequence through a decoder structure; through comparison with a thermodynamic diagram of a real label, a loss value is obtained in a weighted loss calculation module, so that model parameters are solved through back propagation; and S30, a model reasoning stage, wherein after network training is completed, video streams are input into the network for reasoning operation to detect the position of the tennis ball.
Owner:HANGZHOU ARCVIDEO TECHNOLOGY CO LTD

Deep learning-based intelligent identification method and system for air juggling action of table tennis

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.
Owner:SHANGHAI UNIV OF SPORT +1

Self-walking trolley for picking up and serving table tennis balls and tennis balls

The invention discloses a self-walking trolley, and particularly relates to a table tennis and tennis ball picking and serving self-walking trolley which comprises a trolley body forming a storage cavity, a ball picking device is arranged on the trolley body and comprises a first baffle forming a V-shaped groove and a rolling brush motor assembly, and a notch coinciding with a first opening of the storage cavity is formed in the bottom of the V-shaped groove. The rolling brush motor assembly stirs the balls in the V-shaped groove area to move towards the notch of the V-shaped groove, an air channel is formed in the vehicle body and communicated with the storage cavity, and an air channel motor is arranged in the air channel and sucks air in the storage cavity to drive the balls in the notch of the V-shaped groove to overcome the blocking acting force of the blocking piece to enter the storage cavity through the first opening. The technical problem of optimal design of the structure of the ball picking and serving self-walking trolley is solved. The ball picking and serving device has the advantages that the ground trafficability is relatively better, the serving angle can be automatically adjusted, and the ball picking and serving device can adapt to balls with different diameters (including table tennis balls, tennis balls and the like) to pick and serve the balls.
Owner:NINGBO INST OF TECH ZHEJIANG UNIV ZHEJIANG

Table tennis flaw detection system and electronic equipment

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.
Owner:GUANGZHOU DOUBLE FISH SPORTS GOODS GRP +1

Track tracking method for table tennis ball moving at high speed

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%.
Owner:NINGBO UNIV

Real-time tennis serving score distinguishing method and device

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.
Owner:BEIJING GIVERNY SPORTS TECHNOLOGY CO LTD

Multi-angle tennis track analysis method applied to tennis training

The invention discloses a multi-angle tennis track analysis method applied to tennis training, and relates to the technical field of tennis training, a training field is divided into a plurality of sub-regions, opposite high-speed cameras are arranged in each sub-region, and image data of each sub-region are acquired through the arranged high-speed cameras; constructing a corresponding training field model, obtaining a tennis flight path and a flight attitude according to the obtained image data of each sub-region, mapping the obtained tennis flight path and flight attitude into the training field model, and obtaining a tennis flight simulation image; according to the obtained tennis ball flight simulation image, the flight path and the flight attitude of the tennis ball are evaluated, and the serving quality of a trainee is judged according to the evaluation result, so that the serving quality of an athlete is effectively evaluated, and the athlete is assisted in correspondingly adjusting the serving mode of the athlete according to the evaluation result.
Owner:LIANGJIA SPORTS TECH (GUANGZHOU) CO LTD

Ball picking split robot capable of intelligently recognizing quality of table tennis balls and working method

The invention belongs to the technical field of intelligent robots, and discloses a ball picking split robot capable of intelligently recognizing whether table tennis balls are good or not and a working method thereof.The ball picking split robot comprises a base and a ball picking robot, the base is divided into three layers, and the three layers are a ball storage box, a storage box and a charging bin in sequence from top to bottom; the base is provided with a vertically arranged pipeline; the ball picking robot comprises a battery, universal wheels, a shell, a driving motor, a microcomputer, a collecting barrel, a collector, a transition part arranged between the collecting barrel and the shell, two crawler belts arranged in the shell and perpendicular to each other, and a laser radar sensor. A first storage area and a second storage area are further arranged in the shell, and the second storage area is arranged close to the transition part; piston push rods are arranged on one side of the crawler in the width direction; and a fan system is arranged on the same side of the piston push rod. The ball picking split robot solves the problems that in table tennis training, manual table tennis picking efficiency is low, and time and labor are consumed.
Owner:YANCHENG INST OF TECH

Live-action auxiliary penalty method and system

The invention provides a live-action auxiliary penalty method and system. The method comprises the following steps: acquiring video data of a tennis court and tennis balls and human bodies in the tennis court acquired by a camera device in real time; monitoring a tennis ball landing event in the video data, and recording an occurrence time point of the tennis ball landing event; acquiring a plurality of target image frames in the video data within a preset duration before and after the occurrence time point; tennis ball contours of the sports tennis balls are extracted from the multiple target image frames; drawing a tennis ball contour extracted from the plurality of target image frames on a site live-action picture so as to form a live-action dynamic video and / or a live-action static image which correspond to the tennis ball landing event and comprise a tennis ball motion trail; and performing auxiliary penalty according to the live-action dynamic video and / or the live-action static image to generate a penalty result, wherein the penalty result comprises a judgment result of whether the tennis ball is out of the bound and the live-action dynamic video and / or the live-action static image. According to the invention, the accuracy and authenticity of motion analysis by using a common camera are effectively improved.
Owner:ORANGE LION SPORTS (ZHEJIANG) CO LTD

Tennis service recognition method and device based on time interval

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.
Owner:BEIJING GIVERNY SPORTS TECHNOLOGY CO LTD

Table tennis ball quality inspection equipment

The invention belongs to the technical field of table tennis ball quality inspection, and provides table tennis ball quality inspection equipment which comprises an equipment frame body, and a feeding assembly, a quality inspection assembly and a discharging assembly are arranged on the equipment frame body. And the quality inspection assembly comprises a quality inspection turntable mechanism, a turnover mechanism and a detection camera mechanism. The table tennis ball quality inspection equipment is reasonable in structural design, table tennis balls can be guided in multiple ways and automatically guided into a quality inspection placement area of the table tennis ball quality inspection equipment, and meanwhile, the table tennis balls in the quality inspection placement area can be automatically turned over; therefore, it can be guaranteed that the detection camera mechanism in the table tennis ball quality inspection equipment shoots table tennis balls in all directions, the detection accuracy is guaranteed, and the detection camera mechanism shoots the table tennis balls in all directions at the top and the side of the quality inspection placement area and is matched with the detection lighting mechanism, so that the detection accuracy is guaranteed; and finally, the table tennis balls in the quality inspection placement area can be automatically transferred and classified, manual participation is reduced, and the automation degree is higher.
Owner:GUANGDONG YUEPING IND TECH CO LTD +1

Device for returning tennis balls to a ball throwing machine

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).
Owner:PREKER GERD

Convenient physical training equipment transfer device with lifting function

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.
Owner:赣州职业技术学院