Intelligent table tennis ball transmitter

Abstract

The invention discloses an intelligent table tennis ball transmitter, which relates to the technical field of table tennis balls and comprises a video image processing module, a video image recognition module, a training model, a transmitting parameter management system, an image acquisition module, a table tennis ball falling point and track recognition module and a transmitting device. According to the table tennis ball launching machine, launching and rotation of a ball are controlled through the airflow technology, different table tennis ball running paths and falling points are simulated, and targeted training of athletes can be achieved by simulating ball serving of opponents through competition videos and analysis.

Description

Technical Field

[0001] The invention relates to the technical field of table tennis, and in particular to a table tennis intelligent transmitter. Background Art

[0002] As an indispensable equipment in training and competition, table tennis launchers play a key role in improving athletes' reaction speed, hand-eye coordination and tactical ability.

[0003] Although traditional table tennis launchers are helpful in simulating game situations and training basic techniques, their existing designs still face many technical limitations and functional bottlenecks.

[0004] For example, traditional table tennis ball launchers typically rely on motors or spring-driven mechanisms to launch the ball, and these mechanisms generally do not provide enough precise control to produce a specific ball spin. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a table tennis intelligent transmitter.

[0006] In order to solve the problems existing in the prior art, the present invention adopts the following technical solutions:

[0007] A table tennis intelligent transmitter, comprising a video image processing module, a video image recognition module, a training model, a transmission parameter management system, an image acquisition module, a table tennis landing point and trajectory recognition module and a transmitting device;

[0008] The image processing module is used to compress, deframe and decolorize the external game video, so that the image recognition module can quickly identify and generate the trajectory of the table tennis ball;

[0009] The video image recognition module uses the processed image to identify the table tennis ball and the table, and summarizes and generates an array of the table tennis ball's landing point coordinates and trajectory;

[0010] A transmission parameter management system, which is used to manage and automatically configure the transmission parameters of the transmission device;

[0011] The image acquisition module is used to collect image videos after the launch device launches the table tennis ball.

[0012] Preferably, the table tennis ball landing point and trajectory recognition module analyzes the actual landing point and trajectory of the table tennis ball through the video of the table tennis ball after being launched collected by the image acquisition module, which is used to generate and calibrate the training model through machine learning.

[0013] Preferably, the training model is generated through machine learning using a large number of launch parameters, table tennis ball landing points and trajectory points.

[0014] Preferably, a training model is used to bring the landing point and trajectory of the table tennis ball identified by the video image recognition module into the training model to generate optimal launch device parameters.

[0015] Preferably, the model is trained, and the table tennis ball is launched according to the model parameters to simulate the trajectory of the table tennis ball launched by the athlete in the video image.

[0016] Preferably, the method for the table tennis transmitter to acquire video images includes: external storage device, Ethernet, WiFi, and Bluetooth path.

[0017] Preferably, the launching device mainly comprises a launching tube, a cylinder, an air nozzle, a lifting groove, and a launcher displacement system;

[0018] The launch tube is used to limit the table tennis ball to the launch port and retain a certain momentum; a lifting groove is opened on the inner wall of the launch tube, an air nozzle is arranged inside the lifting groove, and a cylinder is arranged on the outer wall of the bottom surface of the launch tube. The cylinder is connected with a plurality of air nozzles and is used to adjust the air pressure inside the launch tube.

[0019] Preferably, an air nozzle is used to exhaust the internal cylinder air in a specified time period, and one air nozzle is deployed at each of the eight positions of the launch tube.

[0020] Preferably, the lifting groove cooperates with the air discharged from the air nozzle to use the viscosity of the air fluid to control the simultaneous rotation of the table tennis ball when the launching tube is displaced. The lifting grooves correspond to one air nozzle respectively, that is, they are deployed in 8 directions respectively.

[0021] Preferably, the transmitter displacement system controls the transmitter to move forward, backward, left, and right, and to raise and lower the launch tube, so that the launch tube can be designated to launch the table tennis ball at a designated spatial position.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. In the present invention, the airflow is used to push the table tennis ball to rotate and move it to the launch port to simulate the table tennis ball launch process, and a training model is generated through machine learning to simulate the serve at any landing point and motion trajectory;

[0024] 2. In the present invention, the simulated serve is automatically realized through image recognition, the landing point and movement trajectory of the table tennis ball relative to the table in the video are identified, and the optimal launch parameters are calculated, so that athletes can train more specifically;

[0025] In summary, the table tennis ball launcher of the present invention uses airflow technology to control the launch and rotation of the ball, simulates different table tennis ball running paths and landing points, and can analyze and simulate the opponent's serve through game videos to achieve targeted training for athletes. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0027] Figure 1 It is a schematic diagram of the overall process of the present invention;

[0028] Figure 2 It is a schematic diagram of the structure of the launch device of the present invention;

[0029] Figure 3 It is a schematic diagram of a table tennis ball launching system of the present invention;

[0030] Figure 4 It is a schematic diagram of adjusting the transmission parameters of the present invention; DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0032] Embodiment 1: This embodiment provides a table tennis intelligent transmitter, see Figure 1 Specifically, it includes a video image processing module, a video image recognition module, a training model, a launch parameter management system, an image acquisition module, a table tennis ball landing point and trajectory recognition module, and a launch device:

[0033] The image processing module is used to compress, deframe and decolorize the external game video, so that the image recognition module can quickly identify and generate the trajectory of the table tennis ball;

[0034] The video image recognition module uses the processed image to identify the table tennis ball and the table, and summarizes and generates an array of the table tennis ball's landing point coordinates and trajectory;

[0035] A transmission parameter management system, which is used to manage and automatically configure the transmission parameters of the transmission device;

[0036] An image acquisition module is used to collect image videos after the launch device launches the table tennis ball;

[0037] The table tennis ball landing point and trajectory recognition module analyzes the actual landing point and trajectory of the table tennis ball through the video of the table tennis ball after it is launched collected by the image acquisition module, and is used to generate and calibrate the training model through machine learning;

[0038] Training model, through a large number of launch parameters, table tennis ball landing points and trajectory points, through machine learning to generate a training model; and the table tennis ball landing points and trajectories identified by the video image recognition module are brought into the training model to generate the best launch device parameters; and the table tennis ball is launched according to the model parameters to simulate the trajectory of the table tennis ball launched by the athlete in the video image;

[0039] The methods for the table tennis transmitter to obtain video images include: external storage device, Ethernet, WiFi, and Bluetooth paths.

[0040] The motion of a table tennis ball in the air can be referred to the following equation:

[0041] Horizontal position:

[0042]

[0043] Vertical position:

[0044]

[0045] Where V 0 is the initial velocity of the ping-pong ball, θ is the launch angle, g is the acceleration due to gravity, and t is the time factor.

[0046] When a ping-pong ball spins in the air, the Magnus effect needs to be considered, that is, the deflection force generated by the rotating object in the fluid causes the object's trajectory to deviate from its original straight trajectory; for a ping-pong ball, spinning in the air will affect its flight path.

[0047] The force generated by the Magnus effect can be expressed as:

[0048]

[0049] in:

[0050] S is the Magnus effect coefficient, which is related to the shape of the object and the properties of the fluid;

[0051] ρ is the fluid density. In this invention, air fluid is mainly considered, for example, according to 1.225 kg / m 3 ;

[0052] A is the cross-sectional area of ​​the object. Generally, the diameter of a ping-pong ball is 4 cm, corresponding to the cross-sectional area A = πr 2 =0.001257m 2 ;

[0053] v is the vector velocity of the object;

[0054] ω is the object’s angular velocity vector;

[0055] The force due to air resistance can be expressed as:

[0056]

[0057] ρ, A, v are defined as above, which are air density, table tennis cross section and velocity respectively.

[0058] C d is the air resistance coefficient.

[0059] In summary, the speed equation of the table tennis ball in the air is:

[0060] Horizontal speed:

[0061]

[0062]

[0063] in, m is the mass (a table tennis ball is usually 0.0027 kg)

[0064] From the above equations, it can be concluded that the trajectory of a standard ping-pong ball (with a fixed cross section and mass) after launch is mainly affected by the air resistance coefficient C. d , air density ρ, gravitational acceleration g and Magnus effect coefficient S. These parameters need to be calculated as characteristic values ​​in the training of the table tennis ball aerial trajectory model; the parameters affected by the launch device are mainly the initial velocity v of the table tennis ball 0 , the launch angle θ and the angular velocity ω of the table tennis ball are also used as feature parameters in the training of the table tennis ball aerial trajectory model.

[0065] Embodiment 2: Based on Embodiment 1, this embodiment further includes:

[0066] In the specific implementation process, Figure 2 As shown, the launch device mainly includes a launch tube, a cylinder, a gas nozzle, a lifting groove, and a launcher displacement system;

[0067] The launch tube is used to limit the table tennis ball from being transported to the launch port and retain a certain momentum; a lifting groove is provided on the inner wall of the launch tube, an air nozzle is provided inside the lifting groove, and a cylinder is provided on the outer wall of the bottom surface of the launch tube, and the cylinder is connected with a plurality of air nozzles to adjust the air pressure inside the launch tube;

[0068] The air nozzle is used to discharge the air in the internal cylinder at a specified time period. There is one air nozzle deployed at each of the eight positions of the launch tube.

[0069] The lifting groove cooperates with the air discharged from the air nozzle, and uses the viscosity of the air fluid to control the simultaneous rotation of the table tennis ball when the launch tube is displaced. Each lifting groove corresponds to an air nozzle, that is, they are deployed in 8 directions respectively;

[0070] The transmitter displacement system controls the transmitter to move forward, backward, left and right, raise the launch tube, and lower the launch tube, so that the launch tube can be designated to launch the table tennis ball at a designated spatial position.

[0071] In the specific implementation process, Figure 3 As shown in the figure, the table tennis launch system, with different nozzle jet timing, duration, pressure, etc., will affect the initial velocity v of the table tennis ball when it leaves the launch tube. 0 And the angular velocity of the ping-pong ball ω, adjusting the position and angle of the launch tube will affect the angle θ when the ping-pong ball leaves the launch tube and the trajectory of the ping-pong ball and the landing point (x, y) on the table.

[0072] According to the table tennis table, a three-dimensional coordinate system is established. Under the same launch parameters, the spatial coordinates of the launch nozzle (x 0 ,y 0 ,z 0 ) will affect the point where the table tennis ball lands on the table or whether it goes beyond the table;

[0073] In the specific implementation process, Figure 4 As shown, by adjusting the launch parameters (such as the air pressure of each nozzle, the injection time, and the position of each lifting groove), the landing point and trajectory of the ping-pong ball are launched and recorded, a large amount of training is performed and a data training model is generated, which is then converted into corresponding launch parameters.

[0074] The characteristic parameters include: the air pressure of each cylinder, the jet time of each nozzle, the position parameters of each lifting groove, the position coordinates of the launch nozzle relative to the table, the ping-pong ball landing point and n ping-pong ball trajectory points corresponding to the same time interval (such as sampling once every 10ms).

[0075] In addition, the most critical part of the table tennis simulation is the trajectory of the ball lifting after landing, and the trajectory of the ball lifting after landing is related to the material of the table, the elastic coefficient of the table tennis ball, the landing position, the landing velocity vector, and the rotation velocity vector. Assuming that the table material and the table tennis parameters are consistent with the trajectory parameters to be simulated, the transmitter can control the landing position, the landing velocity vector and the rotation velocity vector by adjusting the running trajectory before landing, so as to simulate the accurate trajectory of the table tennis ball bouncing up.

[0076] The table tennis ball launcher of the present invention uses airflow technology to control the launch and rotation of the ball, simulates different table tennis ball running paths and landing points, and can analyze and simulate opponent's serve through game videos to achieve targeted training for athletes.

[0077] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A table tennis intelligent transmitter, comprising a video image processing module, a video image recognition module, a training model, a transmission parameter management system, an image acquisition module, a table tennis landing point and trajectory recognition module and a transmitting device, characterized in that: The image processing module is used to compress, deframe and decolorize the external game video, so that the image recognition module can quickly identify and generate the trajectory of the table tennis ball; The video image recognition module uses the processed image to identify the table tennis ball and the table, and summarizes and generates an array of the table tennis ball's landing point coordinates and trajectory; A transmission parameter management system, which is used to manage and automatically configure the transmission parameters of the transmission device; The image acquisition module is used to collect image videos after the launch device launches the table tennis ball.

2. A table tennis intelligent transmitter according to claim 1, characterized in that: The table tennis ball landing point and trajectory recognition module analyzes the actual landing point and trajectory of the table tennis ball through the video of the table tennis ball after it is launched, which is used to generate and accelerate the training model through machine learning.

3. A table tennis intelligent transmitter according to claim 2, characterized in that: The training model is generated through machine learning using a large number of launch parameters, table tennis ball landing points and trajectory points.

4. A table tennis intelligent transmitter according to claim 3, characterized in that: The training model is used to input the landing point and trajectory of the table tennis ball identified by the video image recognition module into the training model to generate the optimal launch device parameters.

5. A table tennis intelligent transmitter according to claim 4, characterized in that: Train the model, launch the ping-pong ball according to the model parameters, and simulate the trajectory of the ping-pong ball launched by the athlete in the video image.

6. A table tennis intelligent transmitter according to claim 5, characterized in that: The methods for the table tennis transmitter to obtain video images include: external storage device, Ethernet, WiFi, and Bluetooth paths.

7. A table tennis intelligent transmitter according to claim 6, characterized in that: The launch device mainly includes a launch tube, a cylinder, a gas nozzle, a lifting groove, and a launcher displacement system; The launch tube is used to limit the table tennis ball to the launch port and retain a certain momentum; a lifting groove is opened on the inner wall of the launch tube, an air nozzle is arranged inside the lifting groove, and a cylinder is arranged on the outer wall of the bottom surface of the launch tube. The cylinder is connected with a plurality of air nozzles and is used to adjust the air pressure inside the launch tube.

8. A table tennis intelligent transmitter according to claim 7, characterized in that: The air nozzle is used to discharge the internal cylinder air in a specified period of time, and one air nozzle is deployed at each of the eight positions of the launch tube.

9. A table tennis intelligent transmitter according to claim 8, characterized in that: The lifting grooves cooperate with the air discharged from the air nozzle and use the viscosity of the air fluid to control the simultaneous rotation of the ping-pong ball when the launching tube is displaced. Each lifting groove corresponds to an air nozzle, that is, they are deployed in 8 directions respectively.

10. A table tennis intelligent transmitter according to claim 9, characterized in that: The transmitter displacement system controls the transmitter to move forward, backward, left and right, raise the launch tube, and lower the launch tube, so that the launch tube can be designated to launch the table tennis ball at a designated spatial position.

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