Motion Capture
Also known as: mocap, marker-based tracking
Motion capture tracks a golfer's body in 3D to build a precise digital skeleton for swing analysis. It traditionally uses reflective markers and several cameras.
Traditional motion capture starts by placing small reflective markers on a golfer's joints and key body landmarks. Several calibrated infrared cameras placed around the room then record the swing. Software triangulates each marker's position, pinpointing it from several camera angles at the same time. The result is a highly precise three-dimensional skeleton that can be measured for angles, rotations, and timing throughout the swing.
This is the gold-standard technology behind most published golf biomechanics research and tour-level fitting studios. It earns that status because marker-based systems locate points with millimeter-level accuracy, which ordinary video cannot match. The tradeoff is cost, setup complexity, and the need for a dedicated studio space. It is not something a golfer can do with a phone in the backyard.
Newer markerless systems try to produce a similar 3D skeleton using only cameras and computer-vision software. No physical markers go on the body. These systems trade some precision for far wider access.
Example
A tour player visits a biomechanics lab wearing dozens of small reflective dots. The resulting 3D model reveals hip rotation speed and spine angle changes down to a fraction of a degree.
In SwingVantage Motion Lab
SwingVantage uses markerless, camera-only pose analysis rather than marker-based motion capture. This makes it far more accessible — any reasonably clear smartphone video works — but it does not achieve the same millimeter-level precision as a marker-based lab. SwingVantage labels its outputs accordingly rather than presenting them as lab-grade measurements.
Related terms
- 3D Swing Analysis3D swing analysis reconstructs the swing from motion capture or several cameras. Angles like hip rotation are then measured, not estimated from a flat image.
- Skeletal TrackingSkeletal tracking is software that finds a person's joints in video and links them into a stick figure. It lets one phone video estimate body positions.
- Pose EstimationPose estimation identifies a person's body position, joint by joint, from a 2D video frame. It is the computer-vision technique behind markerless swing apps.
- Wearable Sensor (Golf)A wearable sensor is a small device clipped to a glove, grip, or belt that measures swing data from its own motion. It is an alternative to video analysis.
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