Virtual reality has become the most popular smart device at present. In order to bring a good experience, VR devices put forward higher requirements on hardware, and sensors are a key part. The sensing device in virtual reality mainly includes two parts: a part of a stereo helmet display for human-computer interaction and wear on an operator, a data glove, a data clothing, etc., and another part is used for correct perception and is set in a real environment. Various visual, auditory, tactile, and force sensations.
The motion capture system is a must for users to truly "enter" the virtual world. This article will bring the analysis of inertial motion capture systems and solutions at home and abroad.
At present, the motion capture system has two main technical routes: inertial and optical. The inertial type appears after the optical type, but the cost is low, the processing flow is simple and mature, and the real-time data calculation and return mechanism make the inertial motion capture system become A hot technology.
composition:
The general structure of the motion capture system is mainly divided into three parts:
Data acquisition device
Data transmission equipment
Data processing unit
The inertial motion capture system applies the inertial sensor to the data acquisition end, and the data processing unit processes the collected data through the inertial navigation principle to complete the attitude angle measurement of the moving target.
Implementation process:
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 does the sensor work?
Accelerometer: 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.
Gyro: The working principle 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. The angle of the object and the angular velocity are used to determine the motion state of the object in three-dimensional space. Its strength lies in the rotational motion of the measuring device itself, but the orientation of the device cannot be determined.
Magnetometer: The magnetometer can just make up for the defect of the above gyroscope. 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 general, the gyroscope knows if we have turned around, the accelerometer knows how long we are moving, and the magnetometer knows where we are moving. In the motion capture system, these three types of sensors need to make full use of their respective features to track the motion of the target object.
Three advantages:
1. Technical advantage
The inertial motion capture system collects a small amount of signals, which facilitates the completion of the attitude tracking task in real time. The calculated attitude information is large in scope, high in sensitivity, and good in dynamic performance. It has high adaptability to the capture environment and is free from external environments such as illumination and background. Interference, and overcome the shortcomings of the limited monitoring area of ​​the optical motion capture system; overcome the occlusion problem often encountered in VR equipment, and can accurately restore the following operations such as squatting, huging, and twisting. In addition, the inertial motion capture system can also achieve multi-target capture.
2. Easy to use
Easy to use, the device is small and light, easy to wear.
3. Cost advantage
Compared with optical motion capture, the inertial motion capture system is low in cost, which makes it not only applicable to industries such as video and games, but also helps VR devices to enter the public life faster.
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Jilin Lander Intelligent Technology Co., Ltd , https://www.jilinlandertech.com