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In movies, our gaze is often deeply attracted by the thrilling life and death struggles, magnificent and unparalleled fantasy scenes. These fictional images usually require post production with the help of computers, known as CG (Computer Graphics) special effects production. In addition to necessary computer post production, special shooting tools and equipment are often needed to capture the indispensable movements of people or objects in production.

Motion capture, also known as mo cap, is an English term for motion capture. Its essence is to measure and record the trajectory of people or objects in space, and it is widely used in many fields such as military, sports, entertainment, medical, computer vision, and robotics technology. At present, there are mainly two types of motion capture methods: optical camera based motion capture; The other type is inertial navigation based motion capture.

Inertial navigation based motion capture utilizes an inertial measurement unit (IMU) consisting of acceleration sensors and gyroscopes to obtain motion trajectory information of the measured object. Actors need to wear special clothes, and the corresponding key positions on the clothes are not marked or illuminated, but a series of IMU modules. These measurement modules are interconnected to form a complete system, with unified power supply and synchronized collection of measurement data. After being processed by specialized biomechanical simulation software, the data can reconstruct and restore the moment and process of each action.

Inertial navigation based motion capture, as a newcomer, is not only convenient to carry, but also has lower requirements for shooting conditions compared to the former. Even in environments such as gardens or corridors, it can still proceed as usual. And this method can effectively avoid the problem of mutual occlusion between body parts during shooting. Most importantly, the cost of using this method is much lower than that of optical motion capture. The emergence of inertial navigation based motion capture is mainly due to the development of MEMS technology in the 1990s. At first, this technology was only used in mobile phones, laptops, and some video game consoles. Later, with the continuous improvement of MEMS sensor performance and the decrease in cost, engineers began to develop various new applications. The AHRS series HEC295 developed by Huilian Technology is an inertial product designed to provide high-precision pitch and azimuth measurements for dynamic capture of motion environments.