Motion capture principle in motion tracking

From a technical point of view, the essence of motion capture is to measure, track and record the motion trajectory of an object in three-dimensional space. A typical motion capture device generally consists of the following parts (see figure 1):

2.2. 1 sensor. The so-called sensor is a tracking device fixed on a specific part of a moving object, which will provide the system with the position information of the moving object, and generally determine the number of trackers according to the details of the snapshot.

2.2.2 Signal acquisition equipment. It is responsible for capturing and identifying the signal of the sensor. It is responsible for the rapid and accurate transmission of sports data from signal acquisition equipment to computer system. This kind of equipment will be different according to the type of system, and they are responsible for capturing position signals. For mechanical system, it is a circuit board that captures electrical signals, and for optical system, it is a high-resolution infrared camera.

Data transmission equipment. Especially for systems that need real-time effects, a large number of motion data need to be quickly and accurately transmitted from signal acquisition equipment to computer system for processing, and data transmission equipment is used to complete this work.

Data processing equipment. The data captured by the system needs to be corrected, and the computer animation work must be completed by combining the three-dimensional model after processing, which requires us to apply data processing software or hardware to complete this work. Both software and hardware use the high-speed computing power of the computer to complete data processing, so that the three-dimensional model can really and naturally move. So it is responsible for processing the original signal captured by the system, calculating the motion trajectory of the sensor and correcting the data.