Human body posture acquisition device

Abstract

The utility model discloses a human body posture acquisition device, which comprises a sensor group comprising an X-axis sensor, a Y-axis sensor, a Z-axis sensor and a signal amplification unit connected with the sensor group and used for amplifying control direction information, force information and weight information; the signal protection and conditioning unit is connected with the signal amplification unit and used for conditioning the amplified control direction information, force information and weight information to correspondingly obtain first voltage information, second voltage information and third voltage information; the signal bias unit is connected with the signal amplification unit and is used for providing bias voltage for the output of the signal amplification unit; and the acquisition unit is connected with the signal protection and conditioning unit so as to receive the first voltage information, the second voltage information and the third voltage information. According to the utility model, a data source can be provided for follow-up movement control of game roles, complicated hardware is not needed for implementation, the cost of equipment is greatly reduced, and the experience feeling of a user can be enhanced.

Description

Technical Field

[0001] The utility model belongs to the technical field of human body posture collection, and in particular relates to a human body posture collection device. Background Art

[0002] In VR preferred devices, the current methods of collecting human posture are:

[0003] 1. Use computer vision to automatically identify targets in images and calculate their postures through complex algorithms. To obtain the target posture in real time, this method requires high-performance GPU support, is costly, and is easily affected by other targets entering the field of view.

[0004] 2. Install inertial navigation sensors at key locations of the target, and send the posture of each key point to the main control wirelessly, which will calculate the posture. This method requires users to wear multiple sensors with batteries, which affects the gaming experience. Wireless solutions are easily affected by the surrounding electromagnetic environment. Utility Model Content

[0005] In order to overcome the above technical defects, the utility model provides a human body posture acquisition device, which can reduce the cost of human body posture acquisition.

[0006] In order to solve the above problems, the utility model is implemented according to the following technical solutions:

[0007] A human body posture acquisition device, comprising:

[0008] A sensor group, including: an X-axis sensor, a Y-axis sensor, and a Z-axis sensor, wherein the X-axis sensor and the Y-axis sensor are both arranged on the joystick, and the Z-axis sensor is arranged at the footrest, the X-axis sensor is used to obtain the control direction information of the player in the XY plane, the Y-axis sensor is used to obtain the force information of the player in the XY plane, and the Z-axis sensor is used to obtain the weight information of the player on the Y axis;

[0009] A signal amplifying unit, connected to the sensor group, for amplifying the control direction information, the force information, and the weight information;

[0010] a signal protection and conditioning unit, connected to the signal amplification unit, for conditioning the amplified control direction information, the force information, and the weight information to obtain first voltage information, second voltage information, and third voltage information accordingly;

[0011] a signal bias unit, connected to the signal amplifying unit, and used to provide a bias voltage for the output of the signal amplifying unit;

[0012] The acquisition unit is connected to the signal protection and conditioning unit to receive the first voltage information, the second voltage information, and the third voltage information.

[0013] As a further improvement of the utility model, the utility model also includes:

[0014] The power conversion unit is connected to the sensor group and the signal bias unit to provide power for the sensor group and the signal bias unit.

[0015] As a further improvement of the present invention, the signal amplification unit includes: three signal amplification circuits with the same structure, the input ends of the three signal amplification circuits are respectively connected to the X-axis sensor, the Y-axis sensor, and the Z-axis sensor, and the output ends are connected to the signal protection and conditioning unit and the signal bias unit.

[0016] As a further improvement of the utility model, the signal bias unit comprises: a first operational amplifier circuit and a second operational amplifier circuit connected to each other;

[0017] The inverting input terminal and the output terminal of the first operational amplifier circuit are connected to the signal amplifying circuit corresponding to the X-axis sensor and the signal amplifying circuit corresponding to the Y-axis sensor;

[0018] The inverting input terminal and the output terminal of the second operational amplifier circuit are connected to the signal amplifying circuit corresponding to the Z-axis sensor.

[0019] As a further improvement of the utility model, the first operational amplifier circuit and the second operational amplifier circuit constitute a voltage follower circuit.

[0020] As a further improvement of the present invention, the signal protection and conditioning unit includes: three signal protection and conditioning circuits with the same structure, the input ends of the three protection and conditioning circuits are correspondingly connected to the three signal amplification circuits, and the output ends are connected to the acquisition unit.

[0021] As a further improvement of the present invention, the X-axis sensor, the Y-axis sensor, and the Z-axis sensor are all resistance strain gauges.

[0022] Compared with the prior art, the beneficial effect of the utility model is that when the player uses the VR game device, the player binds the legs to the joystick, and uses the X-axis sensor and the Y-axis sensor to collect the information of the player's forward, backward, left and right movements. At the same time, the utility model also takes the player's weight into consideration, and uses the Z-axis sensor to collect the player's weight information as an adjustment parameter. The first voltage information, the second voltage information, and the third voltage information are obtained through the signal amplification unit, the signal protection and conditioning unit, and the signal bias unit and sent to the collection unit; providing a data source for the subsequent movement control of the game character, without the need for complex hardware implementation, greatly reducing the cost of the equipment, and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings, wherein:

[0024] Figure 1 This is a schematic diagram of the overall structure of the human body posture acquisition device of the utility model;

[0025] Figure 2 This is a schematic diagram of the installation of the X-axis sensor and the Y-axis sensor of the utility model;

[0026] Figure 3 to Figure 5 It is a structural schematic diagram of the signal amplification circuit of the utility model;

[0027] Figure 6 It is a structural schematic diagram of the first operational amplifier circuit of the utility model;

[0028] Figure 7 It is a structural schematic diagram of the second operational amplifier circuit of the utility model;

[0029] Figure 8 It is a structural schematic diagram of the signal protection and conditioning unit described in the utility model.

[0030] Explanation of the accompanying drawings: 1. sensor group; 11. X-axis sensor; 12. Y-axis sensor; 13. Z-axis sensor; 2. signal amplifying unit; 21. signal amplifying circuit; 3. signal protection and conditioning unit; 31. signal protection and conditioning circuit; 4. signal bias unit; 41. first operational amplifier circuit; 42. second operational amplifier circuit; 5. acquisition unit; 6. power conversion unit. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0032] The utility model provides a human body posture acquisition device, such as Figure 1As shown, it includes: a sensor group 1, a signal amplification unit 2, a signal protection and conditioning unit 3, a signal bias unit 4 and a collection unit 5, wherein the sensor group 1 includes: an X-axis sensor 11, a Y-axis sensor 12, and a Z-axis sensor 13, wherein the X-axis sensor 11 and the Y-axis sensor 12 are both arranged on the joystick, and the Z-axis sensor 13 is arranged at the footrest, the X-axis sensor 11 is used to obtain the control direction information of the player in the XY plane, the Y-axis sensor 12 is used to obtain the strength information of the player in the XY plane, and the Z-axis sensor 13 is used to obtain the weight information of the player on the Y axis; The signal amplification unit 2 is connected to the sensor group 1, and is used to amplify the control direction information, force information, and weight information; the signal protection and conditioning unit 3 is connected to the signal amplification unit 2, and is used to condition the amplified control direction information, force information, and weight information to obtain the first voltage information, the second voltage information, and the third voltage information accordingly; the signal bias unit 4 is connected to the signal amplification unit 2, and is used to provide a bias voltage for the output of the signal amplification unit 2; the acquisition unit 5 is connected to the signal protection and conditioning unit 3 to receive the first voltage information, the second voltage information, and the third voltage information. The X-axis sensor 11, the Y-axis sensor 12, and the Z-axis sensor 13 are all resistance strain gauges, that is, the direction information, force information, and weight information are all voltage information.

[0033] The installation positions of the X-axis sensor 11 and the Y-axis sensor 12 can be referred to Figure 2 It should be noted that the setting positions of the X-axis sensor 11 and the Y-axis sensor 12 should be based on the angle of the force that can be collected by the X-axis sensor 11 and the Y-axis sensor 12 being 90°.

[0034] The differential voltage small signal voltage output by the X-axis sensor 11, the Y-axis sensor 12, and the Z-axis sensor 13 is sent to the ADC acquisition module of the acquisition unit 5 main controller for sampling by the signal amplification unit 2, the signal bias unit 4, and the signal protection and conditioning unit 3. The main controller processes the collected signal and sends it to the control system of the VR game device, thereby controlling the movement of the character. It should be noted that the control system of the VR game device can be set up separately, or the MCU in the acquisition unit 5 can be used to realize its function.

[0035] In addition, the utility model further comprises: a power conversion unit connected to the sensor group 1 and the signal bias unit 4 to provide a 5V DC power supply to the sensor group 1 and the signal bias unit 4 .

[0036] like Figure 3 to Figure 6 As shown, the signal amplifying unit 2 includes: three signal amplifying circuits 21 of the same structure, the input ends of the three signal amplifying circuits 21 are respectively connected to the X-axis sensor 11, the Y-axis sensor 12, and the Z-axis sensor 13, and the output ends are connected to the signal protection and conditioning unit 3 and the signal bias unit 4.

[0037] The sensor group 1 is powered by a 5V DC power supply, and the sensor group 1 outputs a set of reversely changing voltage signals with a median value of 2.5V. The difference of the voltage signals is proportional to the pressure applied to the sensor group 1. Since the difference of the voltage signals is only ±9mV, and the ADC acquisition module of the main controller of the acquisition unit 5 has an acquisition voltage range of 0 to 3.3V, it is necessary to use the signal amplification circuit 21 to amplify the signal to the range that the ADC acquisition module can acquire.

[0038] The differential signals of the X-axis sensor 11, the Y-axis sensor 12, and the Z-axis sensor 13 are respectively input into the signal amplification unit 2 through X+, X-, Y+, Y-, Z+, and Z-. The function of the signal amplification unit 2 mainly adopts AD623ARZ-R7 (operational amplifier U1, operational amplifier U4, and operational amplifier U6). The resistors R1, R5, and R15 set the amplification multiples of the operational amplifiers U1, U4, and U6 to 1000 times. In this way, the outputs of the operational amplifiers U1, U4, and U6 are: ±9mV×1000=±9V. Since this solution adopts a +5V power supply, the signal amplification unit 2 can only output 0~5V. C3, C4, and C9 are filter capacitors to suppress external interference.

[0039] like Figure 6 and Figure 7 As shown, the signal bias unit 4 includes: a first operational amplifier circuit 41 and a second operational amplifier circuit 42 connected to each other; the reverse input terminal and the output terminal of the first operational amplifier circuit 41 are connected to the signal amplifier circuit 21 corresponding to the X-axis sensor 11 and the signal amplifier circuit 21 corresponding to the Y-axis sensor 12; the reverse input terminal and the output terminal of the second operational amplifier circuit 42 are connected to the signal amplifier circuit 21 corresponding to the Z-axis sensor 13. The main function of the first operational amplifier circuit 41 is realized by the operational amplifier U3, whose model is LM358DT, and the main function of the second operational amplifier circuit 42 is realized by the operational amplifier U7, whose model is LM358DT.

[0040] Connect the inverting input and output of operational amplifier U3 and operational amplifier U7 to form a voltage follower circuit. Input the 2.5V voltage obtained by dividing the 5V voltage through two identical ±% 0.1 precision 9.1KΩ resistors (R9, R10, R16, R17) at the same input of the operational amplifier, and the output of the operational amplifier outputs 2.5V to provide bias voltage for operational amplifiers U1, U4, and U6.

[0041] The output zero point of sensor group 1 corresponds to a voltage of 0V. Since a single-ended voltage is used, only changes in one direction of the sensor can be collected. A reference voltage of 2.5V is generated through operational amplifiers U3 and U7 and input to the REF pins of operational amplifiers U1, U4 and U6, which can provide a bias voltage for the outputs of operational amplifiers U1, U4 and U6. The output zero point voltage of sensor group 1, 0V, corresponds to the output voltage of 2.5V of operational amplifiers U1, U4 and U6. When a torque is applied to sensor group 1, the outputs of operational amplifiers U1, U4 and U6 change with 2.5V as the midpoint.

[0042] like Figure 8 As shown, the signal protection and conditioning unit 3 includes: three signal protection and conditioning circuits 31 with the same structure, the input ends of the three protection and conditioning circuits are correspondingly connected to the three signal amplification circuits 21, and the output ends are connected to the acquisition unit 5.

[0043] Taking the X-axis as an example, the working process of the signal protection and conditioning unit 3 is further explained:

[0044] The formula for the maximum voltage after conditioning is:

[0045]

[0046] Substituting the values:

[0047]

[0048] V. =3.226V<3.3V, the ADC acquisition module can sample the voltage.

[0049] Next, the utility model is further explained in combination with the application process of the utility model in VR game equipment, as follows:

[0050] 1. Calculation of the force applied by the player to the joystick

[0051] When no force is applied to the joystick, the output of sensor group 1 is 0, and the voltage output by the signal amplifier circuit 21 is the bias voltage of 2.5V. At this time, the voltage sampled by the ADC acquisition module is When the device applies force, the voltage sampled is Vf, and the applied force F = (Vf-1.613) × K, where K is the proportionality coefficient between voltage and force. When the force is applied, the voltage output by the signal amplifier circuit 21 changes, and this changed voltage can be substituted into the bias voltage 2.5V in the formula.

[0052] The forces on the X-axis and Y-axis are Fx and Fy respectively, so their resultant force F 合 =Fx +F y , can represent the force in any direction in the X, Y plane, and the magnitude of the force

[0053] 2. Joystick sensitivity adjustment based on weighing

[0054] 1. The joystick is bound to the player's legs, and the player applies force to the sensor group by tilting the body. Players of different weights apply different forces to the joystick at the same tilt angle, and the force is proportional to the player's weight. The player's weight is used as an inverse proportional factor to multiply the resultant force, and the magnitude of the resultant force is only related to the player's tilt angle, so players of different weights can get a consistent gaming experience. Then the formula for the magnitude of the resultant force is: F z The calculation formula is the same as Fx and Fy. According to the size and direction of this force, the movement direction and speed of the VR game character in a two-dimensional space can be controlled.

[0055] In summary, the utility model installs a sensor group on the joystick to realize the collection of human posture. The player's legs are bound to the joystick, and the player's forward, backward, left and right movements cause slight deformation of the joystick. The deformation causes the output voltage of the sensor group to change. By collecting the change in voltage value through the ADC acquisition module, the player's force and direction can be deduced, thereby controlling the movement of the VR game character. In order to adapt to players of different weights, this solution also collects the player's weight, and uses the weight as an adjustment factor to participate in the control of the movement of the game character. The utility model can directly use the ADC acquisition module of the main control MCU to realize the acquisition voltage, which has the advantages of low cost, high sampling rate, and timely response.

[0056] This application uses a sensor group at the joystick as the X and Y axes, with an angle of 90° between the X and Y axes. A weighing sensor is installed at the footrest as the Z axis. The magnitude of the X and Y axis forces is collected, and the vector sum is calculated to determine the player's control direction and strength in the X and Y planes. The magnitude of the Z axis force is collected as a multiplication factor for adjusting the combined force of the X and Y axes.

[0057] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Therefore, any modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A human body posture acquisition device, characterized in that: include: A sensor group, including: an X-axis sensor, a Y-axis sensor, and a Z-axis sensor, wherein the X-axis sensor and the Y-axis sensor are both arranged on the joystick, and the Z-axis sensor is arranged at the footrest, the X-axis sensor is used to obtain the control direction information of the player in the XY plane, the Y-axis sensor is used to obtain the force information of the player in the XY plane, and the Z-axis sensor is used to obtain the weight information of the player on the Y axis; A signal amplifying unit, connected to the sensor group, for amplifying the control direction information, the force information, and the weight information; a signal protection and conditioning unit, connected to the signal amplification unit, for conditioning the amplified control direction information, the force information, and the weight information to obtain first voltage information, second voltage information, and third voltage information accordingly; a signal bias unit, connected to the signal amplifying unit, and used to provide a bias voltage for the output of the signal amplifying unit; The acquisition unit is connected to the signal protection and conditioning unit to receive the first voltage information, the second voltage information, and the third voltage information.

2. The human body posture acquisition device according to claim 1, characterized in that: Also includes: The power conversion unit is connected to the sensor group, the signal bias unit and the signal amplification unit to provide power for the sensor group, the signal bias unit and the signal amplification unit.

3. The human body posture acquisition device according to claim 1, characterized in that: The signal amplification unit includes: three signal amplification circuits with the same structure, the input ends of the three signal amplification circuits are respectively connected to the X-axis sensor, the Y-axis sensor, and the Z-axis sensor, and the output ends are connected to the signal protection and conditioning unit and the signal bias unit.

4. The human body posture acquisition device according to claim 3, characterized in that: The signal bias unit comprises: a first operational amplifier circuit and a second operational amplifier circuit connected to each other; The inverting input terminal and the output terminal of the first operational amplifier circuit are connected to the signal amplifying circuit corresponding to the X-axis sensor and the signal amplifying circuit corresponding to the Y-axis sensor; The inverting input terminal and the output terminal of the second operational amplifier circuit are connected to the signal amplifying circuit corresponding to the Z-axis sensor.

5. The human body posture acquisition device according to claim 4, characterized in that: The first operational amplifier circuit and the second operational amplifier circuit constitute a voltage follower circuit.

6. The human body posture acquisition device according to claim 3, characterized in that: The signal protection and conditioning unit comprises: three signal protection and conditioning circuits with the same structure, the input ends of the three protection and conditioning circuits are correspondingly connected to the three signal amplification circuits, and the output ends are connected to the acquisition unit.

7. The human body posture acquisition device according to claim 1, characterized in that: The X-axis sensor, the Y-axis sensor, and the Z-axis sensor are all resistance strain gauges.

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