If you have a certain interest in film and television, animation or games, I believe you must have heard of "motion capture". In fact, whether it is the battlefield on the screen or the real military field, from virtual players in 2K games, to professional research in the field of medical and sports; From the R&D and design of robotic drones to the measurement of undersea tunnels; In various fields such as scientific research, industry, education, entertainment, and military, optical motion capture systems are providing extremely accurate data support. So the question is, how does an optical motion capture system work?
An optical motion capture system consists of an infrared motion capture lens, reflective marking points, POE connectors, motion capture software, and several accessories (such as calibration tools and lens heads). Its working principle is: infrared rays are emitted through the lens, infrared rays will be reflected when irradiated to the marking point, and the induction matrix on the lens can receive the infrared rays reflected back, and the two lenses work at the same time, and the coordinates of the marking point in the three-dimensional space can be determined; A large amount of coordinate data is transmitted to the motion capture software through the POE connector, and the position, direction and motion trajectory of the target in space can be calculated to achieve target tracking. 
Add a note of 140 words or less (optional) Below we explore the specific workflow of an optical motion capture system and how it works in different applications. Although theoretically two lenses can determine the coordinates of the target in three-dimensional space, in practical applications, some of the marked points on the target may be occluded, so an optical motion capture system will be equipped with multiple lenses. The process of calibration is to use a calibration tool to allow the motion capture software to calculate the exact spatial position and angle of the shot, establish three-dimensional spatial coordinates (xyz axis), and prepare for accurate motion capture. 
The calibration tool used in the calibration of the NOKOV (metric) optical three-dimensional motion capture system, through the L-type calibration tool to determine the direction and origin position of the three coordinate axes in the space X, Y, and Z In the optical motion capture system, each infrared motion capture lens has an infrared (long wave) emitter, and the lens will emit infrared light; **The captured target is attached to a marker that reflects infrared light, and the infrared light reflected by the marker is received by a matrix of sensors on multiple lenses. 
When the NOKOV optical 3D motion capture system is in working condition, the high-performance infrared motion capture lens emits infrared light. After the lens at different positions collects the position of the marking point, the three-dimensional coordinates of the point in space can be calculated, and through this principle, the motion capture system can simultaneously collect a series of three-dimensional coordinates of multiple marking points on the target. The main purpose of motion capture is to track and restore the motion information of the target, and the movement trajectory and action information of the marker point can be tracked by multiple lenses continuously collecting the position of the marker point on a certain axis. In the acquisition process, the resolution and frequency of the motion capture lens are very important, which directly determines the accuracy of the motion capture. Whether it is the entertainment industry, or scientific research, industry, military and other fields, the accuracy requirements for motion capture are very strict. At present, the world's top motion capture lenses can reach a resolution of 12 million pixels, a frequency of up to 340Hz, and an accuracy of sub-millimeters. Reflective marker is the most widely used sensor in motion capture, because it is lightweight, small, low-cost, and not easy to damage, whether the target is an actor, animal, drone, robot, or a disabled patient, professional athlete, this marker will not interfere with the target's movement, so as to achieve the most realistic and accurate motion capture. 
Add annotations, no more than 140 words (optional)After the optical motion capture system has finished capturing and tracking, there is one more important task: recognition. Whether the target of motion capture is a performer, a robot, a drone, or a model of a ship or vehicle, it is necessary to analyze the position relationship between the various marking points. Therefore, when the motion capture system works for the first time, the system needs to code each marker to establish a reference template for the target as a whole (for example, the target is a person, and this template is the skeleton model of the person), and then the motion capture system will complete the recognition work according to this template. 
NOKOV (metric) optical three-dimensional motion capture system is used for gait analysis test experiments, the system will establish each identification point on the target into a whole leg model optical motion capture in many motion acquisition, tracking solutions, one of the most significant advantages is accuracy, the other is real-time. The real-time output of usable data is also the last link in the optical motion capture work. For example, after the NOKOV optical 3D motion capture system obtains the position, direction, and 6 degrees of freedom of the joints of the target, its motion capture software can generate SDK broadcasts in real time by writing the underlying **, and transmit them to a variety of third-party software, and its synchronization error reaches the sub-millisecond level, so as to help users realize real-time monitoring, positioning, tracking, measurement or rendering of the target. 
In the research of flapping wing robots, the motion capture system can monitor the attitude and vibration of flapping wings in real time
The attitude of the drone is monitored in real time through the motion capture system.
The motion capture system captures the movements of the passing performers in real time.
For more related cases and motion capture information, please pay attention to the service account [nokov metric motion capture].