CN104461012A - Dance training evaluation system based on digitized place and wireless motion capture device - Google Patents

Abstract

The invention relates to a dance training evaluation system based on a digital venue and a wireless motion capture device, which uses a digital venue and a wireless motion capture device to simultaneously collect two-dimensional plantar pressure distribution information and spatial posture information of a dancer in real time, and obtains the dancer through information fusion. The movement information of the dancer is sent to the computer through Ethernet; the computer uses the movement information data to drive the human body model to move in three-dimensional space, realize the dancer's movement reconstruction, and simultaneously extract, analyze and display the biomechanical parameters and kinematic parameters of the movement; By building dance action templates and knowledge bases, online evaluation of dancers' dancing postures can be realized, and real-time guidance and demonstration can be given to dancers. The present invention is based on the design of movable assembling digital venues and wireless wearable motion capture equipment, which can capture the dancer's motion information without affecting the dancer's dance motion, and is suitable for teaching, training and evaluation of various dances.

Description

A dance training evaluation system based on digital venues and wireless motion capture equipment

technical field

The invention relates to the fields of sensing technology, sports biomechanics and dance training automation, in particular to a dance training evaluation system based on digital venues and wireless motion capture equipment.

technical background

Dance is an art that expresses emotions through physical performance in three-dimensional space. It uses human body movements and postures as its form of expression. Mass sports dance can highly combine sports, art and daily life. It has the characteristics of both refined and popular, and the participation of the whole people. It has a significant effect on cultivating sentiment, overcoming psychological barriers, and improving health. It is an extremely popular dance with strong development potential. mass fitness exercise.

In the process of training dancers, the training and evaluation of dance movements is very important. Traditional training evaluation basically relies on the naked eye and experience of the coaches, and can only roughly understand their own learning and training from a macro perspective. It cannot be judged when it comes to specific technical parameters. It lacks objective and scientific guidance methods and training basis. It is not conducive to the selection and training of talents. Don't be strict with dance learning. The beauty of dance is inseparable from every precise, standardized and perfect dance movement. If the standardization of dance movements is not high during the learning process, it will be difficult to achieve exquisite dance movements. . Traditional dance analysis tools use video camera systems to analyze dancers' dance movements after the whole dance is over. This invention uses digital venues and wireless motion capture equipment to collect dancer's movement information and transmits it to the computer, and then quantifies it. The data is used to analyze the dancer's movements in real time, and by comparing the movement information collected by the dancer in real time with the dance movement template and the movement information in the knowledge base, the dancer's movements can be evaluated and given real-time guidance.

Motion capture technology is a technology that records human motion information for analysis and playback. The classification of motion capture includes mechanical motion capture, acoustic motion capture, electromagnetic motion capture, optical motion capture, and inertial navigation motion capture. The data captured can be as simple as recording the spatial position of a limb, or as complex as recording the detailed movements of the face and muscle groups. Dance expresses the thoughts and content of the dancer through the movements of the human body. It itself also uses changes in human body movements to show beautiful dancing postures, so it is necessary to capture the movements of dancers. The captured information is of great significance to both dance teachers and dance students: dance teachers can evaluate whether their teaching methods are appropriate through dance movement evaluation, and then improve teaching methods in a targeted manner to improve teaching quality; dance movement capture not only helps dance students Objectively understand your own mistakes and disadvantages, and fundamentally solve various problems encountered in learning and training, so as to train and correct them in a targeted manner, and improve the training effect, which can also improve the technological content and scientific training in the dance training process level.

According to the patent query of the National Patent Office Retrieval Center, there is a digital track and gait training method that can be assembled for track and field training systems. The application number is: 200910117111.X, and the publication number is: CN101590315A. Its advantage is that it can obtain the movement sequence of athletes Parameters can be flexibly transferred with the transfer of training locations, and the combination of dynamics and kinematics information can be extracted to improve the flexibility and intelligence of sports training tools. The assembled digital field module is composed of a surface layer, a sensor layer, a sensor protection layer and a physical and chemical layer; the surface layer is located on the top layer, and multiple sensor units in the sensor layer are connected by row leads and column leads, placed between the surface layer and the protection layer The row leads and column leads are connected to the field bus, and the collected signals pass through the row leads and column leads, and after a series of processing, they are sent to the computer for processing through the field bus, and the information processed by the computer is displayed and acted on the display screen. playback. The digital field that can be assembled can be assembled into different shapes according to the needs, and can also be disassembled, transported and assembled according to the change of the training field, so as to realize the optionality of the field.

According to the patent query of the National Patent Office Retrieval Center, there is a device and system for motion capture, the application number is: 201120360295.5, and the publication number is: CN202218347U. The motion capture system based on multi-point inertial attitude measurement technology includes multiple sensor nodes located on the target body. When in use, the data of multiple sensor nodes needs to be collected and processed in a centralized manner and wirelessly transmitted to the host computer system. The host computer system Perform attitude recovery operation.

The above two patents are respectively a gait training method and a motion capture device in a digital venue, and they only introduce a single method and device; these technologies cannot analyze the dancer's posture information and gait information at the same time, and there is no evaluation for dance training. An effective solution is proposed, which has a limited effect on the training guidance of dancers.

Contents of the invention

The technology of the present invention solves the problem: Aiming at the existing defects of dance training and the deficiencies of the prior art, based on digital venues and motion capture technology, a dance training evaluation system based on digital venues and wireless motion capture equipment is proposed, which can be applied to dance This will greatly improve the level and quality of dance training.

In order to achieve the above object, technical scheme of the present invention is:

A dance training evaluation system based on a digital venue and a wireless motion capture device, characterized in that it includes: a movable and assembleable digital venue, a wireless motion capture device, a clock synchronizer, an Ethernet switch, a computer and a power supply;

The movable and assembleable digital venue is composed of a plurality of 1-meter-by-1-meter square digital floors based on flexible array pressure sensors, which are used to obtain two-dimensional plantar pressure distribution information of dancers; the digital floor is composed of substrates 1. A flexible array pressure sensor and a three-layer composite of plastic materials; the substrate is made of a physical and chemical board with a thickness of 20 mm; the pressure sensitive point density of the flexible array pressure sensor is 4 points per square centimeter, and the pressure sensitive points are uniform Arranged on the digital floor, the thickness is 2 mm; the thickness of the plastic material is 5 mm; a power interface, a synchronization interface and an Ethernet interface are left on the side of the digital floor, and the power interface, synchronization interface and Ethernet interface are respectively Connect the power supply, clock synchronizer and Ethernet switch; the digital floor is connected by an embedded convex-concave structure, which can be spliced into a suitable digital venue according to the scope of dance training activities or the size of the training venue;

The wireless motion capture device is composed of multiple wireless motion capture units and WIFI wireless routers; the wireless motion capture unit adopts a wearable design, which is worn on multiple limbs of the dancer to obtain the dancer's limb posture information, and pass The WIFI wireless communication method sends to the WIFI wireless router, and the WIFI wireless router forwards it to the computer through the Ethernet switch; the wireless motion capture unit has a synchronous charging interface, an LED indicator light and a power switch; the synchronous charging interface is used for wireless motion capture. The unit is charging or connected to a clock synchronizer; the LED indicator is used to indicate the status of the wireless motion capture unit. The LED indicator is green to indicate the charging status, red to indicate the standby status, and red to flash slowly to indicate the synchronized status. Fast flashing indicates the data acquisition status; WIFI wireless router is the relay station between the wireless motion capture unit and the computer, and the WIFI wireless router forwards the data sent by the wireless motion capture unit to the computer through the Ethernet switch and at the same time transmits the instructions sent by the computer through the Ethernet switch Forward to the wireless motion capture unit;

The clock synchronizer is used to synchronize the time axis of the digital site and the wireless motion capture device; the clock synchronizer includes a power interface, an Ethernet interface and 20 synchronization interfaces; the power interface is used to connect the power supply to the clock synchronizer; the Ethernet The interface is connected to the computer through an Ethernet switch; the synchronization interface is respectively connected to the digital floor and the wireless motion capture unit; all the synchronization interfaces of the digital floor are connected in series to a synchronization interface of the clock synchronizer; each wireless motion capture unit is connected to the clock synchronization on a synchronous interface of the device;

The Ethernet switch is used for Ethernet connection and data exchange between the computer and the digital field, the wireless motion capture unit and the clock synchronizer;

The computer synchronously collects the two-dimensional plantar pressure distribution information of the dancer and the posture information of all wireless motion capture units, fuses the posture information of multiple wireless motion capture units to obtain the spatial posture information of the dancer, and constructs the motion information frame according to the time stamp; The action information frame drives the human body model to move in three-dimensional space, realizing the dancer's action reconstruction; the computer builds the dance action template and knowledge base based on the action information frame to realize the online evaluation of the dancer's dance posture, and makes a detailed analysis of the dancer's dance action. Give real-time guidance and demonstration.

The power supply provides working power for the digital venue and the clock synchronizer.

The dance training evaluation system based on digital venues and wireless motion capture equipment is characterized in that: the two-dimensional plantar pressure distribution information includes time stamps, plantar pressure center coordinates, plantar pressure distribution data and plantar total Pressure value; the sampling interval of the digitized field is 10 milliseconds; the center coordinates of the plantar pressure are based on a pressure-sensitive point in the digitized field as the reference origin, and can be calculated according to the size of the digitalized floor and the density of the pressure-sensitive point of the flexible array pressure sensor Obtained; the plantar pressure distribution data includes the pressure values of all pressure-sensitive points; the total pressure value of the plantar is the sum of the pressure values of all pressure-sensitive points.

The dance training evaluation system based on a digital venue and a wireless motion capture device is characterized in that: the wireless motion capture unit is respectively worn on 17 parts of the dancer, and the 17 parts are respectively: the dancer's head, Left shoulder, right shoulder, left upper arm, right upper arm, left lower arm, right lower arm, left hand, right hand, chest, waist, left upper leg, right upper leg, left lower leg, right lower leg, left foot and right foot.

Described a kind of dance training evaluation system based on digital venue and wireless motion capture equipment is characterized in that: the space attitude information includes time stamp, acceleration, angular velocity, geomagnetism and quaternion, Euler angle; the wireless motion capture The unit sampling interval is 10 milliseconds; the three-dimensional space where the spatial posture information is located is based on the reference origin of the coordinate system where the two-dimensional plantar pressure distribution information is located, and the X-axis direction of the coordinate system where the two-dimensional plantar pressure distribution information is located is used as the X-axis direction , taking the Y-axis direction of the coordinate system where the two-dimensional plantar pressure distribution information is located as the Y-axis direction, and taking the upward direction of the coordinate system where the two-dimensional plantar pressure distribution information is located is the Z-axis direction.

The dance training evaluation system based on digital venues and wireless motion capture equipment is characterized in that: the motion information frame includes time stamps, two-dimensional plantar pressure distribution information, posture information of all wireless motion capture units, dancer space Posture information and dancer limb segment length information; through the action information frame, the dancer's plantar pressure distribution parameters can be obtained: the coordinates of the plantar pressure center, the plantar pressure distribution data, the total pressure value of the plantar and the digitalization of the dancer's plantar The moving track, moving speed, and moving distance on the field; through the action information frame, the space posture parameters of the dancer can be obtained: acceleration, angular velocity, geomagnetism, quaternion, Euler angle, and spatial position coordinates, displacement, orientation angle, and rotation angle , velocity, displacement acceleration, angular acceleration.

The said dance training evaluation system based on digital venue and wireless motion capture equipment is characterized in that: the clock synchronizer outputs a synchronous trigger signal through a synchronization interface after receiving the computer synchronization instruction; the digital floor and the wireless motion capture unit receive The time stamp starts counting after the trigger signal is synchronized, so as to ensure that all collected data are synchronized on the time axis.

The said dance training evaluation system based on digitized venue and wireless motion capture device is characterized in that: said dance movement template and knowledge base are collected standard dance movements through digitized venue and wireless motion capture equipment and are in the form of motion information frames stored in a computer database. During the evaluation of dance movement training, the dancer's movement is evaluated and real-time guided by comparing the movement information frame collected by the dancer in real time with the dance movement template and the movement information frame in the knowledge base.

The beneficial effect of the present invention relative to prior art is:

(1) The present invention uses the coordination and synchronization of computers to organically integrate digital venues and wireless motion capture equipment; the computer synchronously collects the two-dimensional plantar pressure distribution information of the dancer and the spatial posture information of the dancer, and uses information fusion The technology fuses the dancer's two-dimensional plantar pressure distribution information and spatial posture information into an action information frame, and then uses the action information frame to drive the human body model to move in three-dimensional space to realize the dancer's action reconstruction; the computer based on the action information frame The dance action template and knowledge base realize the online evaluation of the dancer's dance posture, and provide real-time guidance and demonstration for the dancer's dance action.

(2) The digital venue used in the present invention is built on the basis of a digital floor, which can be installed into a suitable shape according to the dancer's range of motion, thus suitable for training and evaluation of various dances.

(3) The wireless motion capture device in the present invention is worn on the dancer in the form of a wearable device and adopts WIFI wireless communication mode, which not only minimizes the interference to the dancer's dance movements, but also can effectively collect the information about dance moves.

(4) The trigger signal of the clock synchronizer of the present invention is output to the synchronization interface of the digital floor and the wireless motion capture unit through wires, so the synchronization angle between each device is very high.

(5) The present invention unifies the two-dimensional plantar pressure distribution information of the dancer and the spatial posture information of the dancer into a three-dimensional coordinate system, and the data in the action information frame is consistent in space, so that the acquired action information Spatial synchronization is greatly improved.

(6) The action information frame constructed by the present invention can not only accurately reflect the action characteristics of the dancer, but also extract various biomechanical parameters and kinematic parameters; the action information frame can also improve storage efficiency and facilitate the comparison and evaluation of dance actions .

Description of drawings

Fig. 1 is a schematic structural diagram of a dance training evaluation system based on digital venues and wireless motion capture equipment;

Fig. 2 is a schematic diagram of the composition of an action information frame in the present invention;

Fig. 3 is a working flow chart of the system of the present invention.

Detailed ways

The present invention is described in detail below in conjunction with accompanying drawing:

Fig. 1 is a schematic structural diagram of a dance training evaluation system based on a digital venue 102 and a wireless motion capture device; the present invention includes: a movable and assembleable digital venue 102, a wireless motion capture device, a clock synchronizer 105, an Ethernet switch 106, and a computer 107 and power supply 108;

The movable and assembleable digital venue 102 is composed of several 1m×1m square digital floors 01 based on flexible array pressure sensors, which are used to obtain the two-dimensional plantar pressure distribution information of dancers; The embedded convex-concave structures are connected, and can be spliced into a digital venue 102 with a suitable shape according to the scope of dance training activities or the size of the training venue. Fig. 1 has used 25 pieces of digitized floors 101 to splicing into 5 meters * 5 meters square digitized site 102;

The wireless motion capture device is composed of multiple wireless motion capture units 103 and WIFI wireless router 104; the wireless motion capture unit 103 adopts a wearable design and is worn on 17 body parts of the dancer, and the 17 body parts are: dancer head, left shoulder, right shoulder, left upper arm, right upper arm, left lower arm, right lower arm, left hand, right hand, chest, waist, left upper leg, right upper leg, left lower leg, right lower leg, left foot and right foot; wireless motion Capture unit 103 sends the dancer posture information data that gathers to WIFI wireless router 104 by WIFI wireless communication mode, and WIFI wireless router 104 then forwards to computer 107 by Ethernet switch 106; WIFI wireless router 104 is connected to Ethernet by wired mode network switch 106;

The synchronous interface of the clock synchronizer 105 is respectively connected to the digital floor 101 and the wireless motion capture unit 103; all the digital floor 101 synchronous interfaces are connected in series to a synchronous interface of the clock synchronizer 105; the synchronous interfaces of a plurality of wireless motion capture units 103 respectively connected to a synchronous interface of the clock synchronizer 105;

Ethernet switch 106 is used for Ethernet connection and data exchange between computer 107 and digital field 102, wireless motion capture unit 103 and clock synchronizer 105;

The power supply 108 provides working power for the digital site 102 and the clock synchronizer 105 .

Select a pressure-sensitive point 109 of the digitized site 102 to construct the coordinate system 110 as the origin of the three-dimensional space coordinate system of the present invention; the reference origin of the coordinate system where the two-dimensional plantar pressure distribution information is located is 109, and the X axis is the X axis of the coordinate system 110, and Y The axis is the Y axis of the coordinate system 110; the reference origin of the coordinate system where the three-dimensional space where the space posture information is located is 109, the X axis is the X axis of the coordinate system 110, the Y axis is the Y axis of the coordinate system 110, and the Z axis is the coordinate system 110 Z-axis;

Figure 2 is a schematic diagram of the composition of the action information frame 203 of the present invention, the action information frame 203 includes a time stamp 205, two-dimensional plantar pressure distribution information 201, posture information and space posture information 202 of 17 wireless motion capture units 103, and dancer limbs Segment length information 204; Two-dimensional plantar pressure distribution information 201 includes time stamp 205, plantar pressure center coordinates, plantar pressure distribution data and plantar total pressure value; Wireless motion capture unit 103 posture information and space posture information 202 include time Stamp 205, acceleration, angular velocity, geomagnetism, quaternion, Euler angle and spatial position coordinates, displacement, orientation angle, rotation angle, velocity, displacement acceleration, angular acceleration.

Fig. 3 is the working flow diagram of the present invention, and specific steps are as follows: Step 300: system initialization work mainly comprises: the power-on initialization of digitized field 102, clock synchronizer 105 and 17 wireless motion capture units 103; Digitized field 102 and 17 The synchronization interface of each wireless motion capture unit 103 is connected to the synchronization interface of the clock synchronizer 105; Step 301: the computer 107 sends a synchronization command to the clock synchronizer 105, and the clock synchronizer 105 outputs a synchronous trigger signal to complete the digitization of the venue 102 and all wireless motion capture Synchronization of the unit 103; after the synchronization is completed, the wireless motion capture unit 103 is worn on 17 parts of the dancer's body; step 302: the computer 107 sends out a command to start collecting, and starts synchronously collecting data; step 303: the computer 107 receives the dancer's two Dimensional plantar pressure distribution information 201 and all wireless motion capture units 103 posture information, fuse the posture information of 17 wireless motion capture units 103 to obtain dancer space posture information, and construct the motion information frame 203 according to the time stamp 205, and then put the motion information frame 203 is stored in the computer 107; Step 304: Use the action information frame 203 to drive the human body model to move in three-dimensional space to realize the dancer's action reconstruction, and display the relevant biomechanical parameters and kinematic parameters; Step 305: Select whether to Need to be stored in template and knowledge base, if so then enter step 306, otherwise go to step 307; Step 306: store the motion information frame 203 that gathers in template and knowledge base; Evaluate, if so, enter step 308, otherwise enter step 309; step 308: compare a group of action information frames 203 collected with templates and corresponding action information frames 203 in the knowledge base, and output evaluation results accordingly; step 309 : choose whether to end the collection, if yes, enter step 310, otherwise go to step 302; step 310: end this collection, exit the system of the present invention.

Example:

The dancer uses the present invention to evaluate the dance action, and the specific process is: (1) turn on the power switch of the power supply 108 and 17 wireless motion capture units 103, and connect the synchronous interface of the digitized venue 102 and 17 wireless motion capture units 103 To the synchronous interface of the clock synchronizer 105, the digital site 102, the clock synchronizer 105 and 17 wireless motion capture units 103 complete the system initialization; (2) the computer 107 sends a synchronization instruction to the clock synchronizer 105, and the clock synchronizer 105 outputs a synchronous The trigger signal completes the synchronization of the digitized venue 102 and all the wireless motion capture units 103; after the synchronization is completed, the wireless motion capture units 103 are worn on 17 parts of the dancer's body; (3) the computer 107 issues a start collection command to start synchronous data collection (4) computer 107 receives the dancer's two-dimensional plantar pressure distribution information 201 and all wireless motion capture unit 103 attitude information, and performs fusion calculation to construct motion information frame 203; (5) utilize motion information frame 203 to drive human body model in The movement in the three-dimensional space realizes the reconstruction of the dancer's movement, and displays the relevant biomechanical parameters and kinematic parameters; (6) The computer 107 combines the collected set of movement information frames 203 with the corresponding movement information frames in the template and the knowledge base 203 to compare and output the evaluation result; (7) complete the dance movement evaluation.

Apparently, those skilled in the art can make various changes and modifications to the dance training evaluation system based on digital venues and wireless motion capture equipment of the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and equivalent technologies thereof, the present invention also intends to include these modifications and variations.

Claims (7)

1. A dance training assessment system based on digital venues and wireless motion capture equipment, characterized in that it includes: movable assembled digital venues, wireless motion capture equipment, clock synchronizers, Ethernet switches, computers and power supplies; The movable and assembleable digital venue is composed of multiple square digital floors based on flexible array pressure sensors, which are used to obtain the two-dimensional plantar pressure distribution information of dancers; the digital floor is composed of substrates, flexible array pressure sensors It is composed of three layers of plastic materials; there is a power interface, a synchronization interface and an Ethernet interface on the side of the digital floor, and the power interface, synchronization interface and Ethernet interface are respectively connected to the power supply, clock synchronizer and Ethernet switch; The digital floor is connected by an embedded convex-concave structure, which can be spliced into a suitable digital venue according to the scope of dance training activities or the size of the training venue; The wireless motion capture device is composed of multiple wireless motion capture units and WIFI wireless routers; the wireless motion capture unit adopts a wearable design, which is worn on multiple limbs of the dancer to obtain the dancer's limb posture information, and pass The WIFI wireless communication method sends to the WIFI wireless router, and the WIFI wireless router forwards to the computer through the Ethernet switch; the wireless motion capture unit has a synchronous charging interface, an LED indicator light and a power switch; the synchronous charging interface is used for the wireless motion capturing unit Charging or connecting a clock synchronizer; the LED indicator is used to indicate the status of the wireless motion capture unit, where the LED indicator is green for charging status, red for standby status, red for slow flashing for synchronized status, and red for fast Blinking indicates the data acquisition status; WIFI wireless router is the relay station between the wireless motion capture unit and the computer. The WIFI wireless router forwards the data sent by the wireless motion capture unit to the computer through the Ethernet switch and at the same time forwards the instructions sent by the computer through the Ethernet switch. to the wireless motion capture unit; The clock synchronizer is used to synchronize the time axis of the digitized venue and the wireless motion capture device; the clock synchronizer includes a power interface, an Ethernet interface and a plurality of synchronization interfaces; the power interface is used to connect a power supply to supply power to the clock synchronizer; the Ethernet The network interface is connected to the computer through an Ethernet switch; the synchronization interface is respectively connected to the digital floor and the wireless motion capture unit; all the digital floor synchronization interfaces are connected in series to a synchronization interface of the clock synchronizer; each wireless motion capture unit is connected to the clock On a synchronous interface of the synchronizer; The Ethernet switch is used for Ethernet connection and data exchange between the computer and the digital field, the wireless motion capture unit and the clock synchronizer; The computer synchronously collects the two-dimensional plantar pressure distribution information of the dancer and the posture information of all wireless motion capture units, fuses the posture information of multiple wireless motion capture units to obtain the spatial posture information of the dancer, and constructs the motion information frame according to the time stamp; The action information frame drives the human body model to move in three-dimensional space, realizing the dancer's action reconstruction; the computer builds the dance action template and knowledge base based on the action information frame to realize the online evaluation of the dancer's dance posture, and makes a detailed analysis of the dancer's dance action. Give real-time guidance and demonstration. The power supply provides working power for the digital venue and the clock synchronizer. 2. according to claim 1, a kind of dance training evaluation system based on digitized field and wireless motion capture equipment, it is characterized in that: said two-dimensional plantar pressure distribution information includes time stamp, plantar pressure center coordinates, plantar pressure Distribution data and plantar total pressure value; said plantar pressure center coordinates are based on a pressure-sensitive point in the digitized field as the reference origin, and can be calculated according to the size of the digitized floor and the density of the pressure-sensitive point of the flexible array pressure sensor; The plantar pressure distribution data includes the pressure values of all pressure-sensitive points; the total plantar pressure value is the sum of the pressure values of all pressure-sensitive points. 3. according to claim 1, a kind of dance training evaluation system based on digitized venue and wireless motion capture equipment is characterized in that: said wireless motion capture unit is respectively worn on 17 positions of the dancer, and the 17 positions are respectively: Dancer's head, left shoulder, right shoulder, left upper arm, right upper arm, left lower arm, right lower arm, left hand, right hand, chest, waist, left upper leg, right upper leg, left lower leg, right lower leg, left foot and right foot. 4. according to claim 1, a kind of dance training evaluation system based on digitized venue and wireless motion capture equipment, it is characterized in that: said spatial attitude information includes time stamp, acceleration, angular velocity, geomagnetism and quaternion, Euler angle ; The three-dimensional space where the space attitude information is located is based on the reference origin of the coordinate system where the two-dimensional plantar pressure distribution information is located, and the X-axis direction of the coordinate system where the two-dimensional plantar pressure distribution information is located is used as the X-axis direction, and the two-dimensional plantar pressure distribution information is used as the X-axis direction. The Y-axis direction of the coordinate system where the pressure distribution information is located is the Y-axis direction, and the upward direction of the coordinate system where the vertical two-dimensional plantar pressure distribution information is located is the Z-axis direction. 5. A dance training evaluation system based on digital venues and wireless motion capture devices according to claim 1, wherein the motion information frame includes time stamps, two-dimensional plantar pressure distribution information, and all wireless motion capture units Posture information, dancer space posture information and dancer limb segment length information; the dancer's plantar pressure distribution parameters can be obtained through the action information frame: plantar pressure center coordinates, plantar pressure distribution data, total plantar pressure value and The trajectory, speed, and distance of the dancer's foot on the digital venue; the dancer's spatial posture parameters can be obtained through the action information frame: acceleration, angular velocity, geomagnetic field, quaternion, Euler angle, and spatial position coordinates, displacement , direction angle, rotation angle, velocity, displacement acceleration, angular acceleration. 6. according to claim 1, a kind of dance training evaluation system based on digital venues and wireless motion capture equipment is characterized in that: after the clock synchronizer receives the computer synchronization instruction, it outputs a synchronous trigger signal through a synchronous interface; the digital floor and The time stamp starts counting after the wireless motion capture unit receives the synchronous trigger signal, so as to ensure that all collected data are synchronized on the time axis. 7. according to claim 1, a kind of dance training evaluation system based on digitized venue and wireless motion capture device is characterized in that: said dance movement template and knowledge base are collected standard dance movements by digitized venue and wireless motion capture equipment and It is stored in the computer database in the form of action information frames; during the dance action training evaluation, the dancer's actions are compared by comparing the action information frames collected by the dancers in real time with the dance action templates and the action information frames in the knowledge base. Assessment and real-time coaching.