Landmark Tracking
Also known as: keypoint tracking, joint tracking
Landmark tracking follows the position of each detected body keypoint across consecutive video frames, creating a time-series trajectory for every joint that enables timing and velocity measurements.
Pose estimation finds where joints are in a single frame; landmark tracking connects those positions over time to produce trajectories. From trajectories you can derive velocities, accelerations, angles at specific moments (like impact), and sequencing relationships between body segments. Tracking errors — where a joint jumps between frames — are a known challenge and are handled by filtering algorithms. Any metric derived from a noisy trajectory is labeled with lower confidence or flagged as an estimate.
Example
Landmark tracking follows the lead wrist across 40 frames of a golf downswing, computing peak wrist speed and the exact frame where it reaches maximum extension.
Related terms
- Pose EstimationPose estimation is the computer-vision process that detects the positions of major body joints (keypoints) in each video frame, producing the skeleton that SwingVantage uses to measure angles and movement patterns.
- Skeleton OverlayA skeleton overlay is the on-screen visualization of detected body joints and the lines connecting them, drawn over your video so you can see exactly what the system tracked.
- Kinematic ChainThe kinematic chain is the sequence of body segments — from ground to tip — through which force and speed are transferred in a swing, with each segment's energy amplifying the next.
- Movement SequencingMovement sequencing is the timed order in which body segments accelerate and decelerate through a swing — correct sequencing multiplies speed; incorrect sequencing bleeds it.
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