At present, the motion capture system has two main technical routes: inertial and optical. Although the inertial type appears in the optical form, it is ultra-low cost and simple and mature processing flow, as well as a completely real-time data calculation and return mechanism. A more hot technology. At present, the most representative products in the world are the Xsens MVN inertial motion capture system developed by Xsens in the Netherlands and the 3DSuit inertial motion capture system developed by Innalabs of the United States. In the domestic, there are companies such as Nuo Yi Teng and Guo Cheng Wantong.
So how does the inertial motion capture system work correctly in virtual reality? This paper will analyze the working principle, advantages, and shortcomings of inertial motion capture, and hope to discuss it with the industry.
| Principle of inertial motion capture system
The general structure of the motion capture system is mainly divided into three parts: data acquisition equipment, data transmission equipment, and data processing unit. The inertial motion capture system applies the inertial sensor to the data acquisition end, and the data processing unit uses the principle of inertial navigation. The collected data is processed to complete the attitude angle measurement of the moving target.
How is the inertial motion capture system specifically implemented?
At the important node of the moving object, an inertial sensor device such as an integrated accelerometer, a gyroscope and a magnetometer is worn. The sensor device captures the motion data of the target object, including the posture and orientation of the body part, and transmits the data to the data transmission device. In the data processing device, after the data is corrected and processed, the three-dimensional model is finally established, and the three-dimensional model is truly and naturally moved with the moving object.
The processed dynamic capture data can be applied in animation, gait analysis, biomechanics, ergonomics and other fields.
How do accelerometers, gyroscopes and magnetometers work?
The accelerometer is used to detect the magnitude and direction of the acceleration received by the sensor. It obtains the result by measuring the force of the component in an axial direction. The expression is the axial acceleration magnitude and direction (XYZ), but used to The position of the measuring device relative to the ground is not accurate, and the defect can be compensated by the gyroscope.
The working principle of the gyroscope is to measure the angle between the vertical axis of the gyro rotor and the device in the three-dimensional coordinate system, and calculate the angular velocity, and determine the motion state of the object in three-dimensional space by the angle and the angular velocity. Its strength lies in the rotational motion of the measuring device itself, but the orientation of the device cannot be determined. And just the magnetometer can make up for this defect, its strength lies in the orientation of the positioning device, which can measure the angle between the current equipment and the four directions of the southeast and the northwest.
In motion capture systems, gyro sensors are used to process rotational motion, accelerometers are used to process linear motion, and magnetometers are used to process directions. Speak easy-to-understand -
The gyroscope knows "we have turned around", the accelerometer knows "how long we exercise," and the magnetometer knows "our direction of motion."
In the motion capture system, three sensors make full use of their respective characteristics to track the motion of the target object.
At present, the most representative products in the world are the Xsens MVN inertial motion capture system developed by Xsens in the Netherlands and the 3DSuit inertial motion capture system developed by Innalabs. The MVN is a full-body Lycra set (also with straps) that is easy to use and allows the user to set up the entire system in 15 minutes. It features a miniature inertial sensor, biomechanical model, and sensor fusion algorithm with 17 inertial trackers that track body movements in 6 degrees of freedom. Xsens MVN has fast turnaround times and data transmission is stable and error-free, saving up to 80% post-processing time.
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