| Dist_kumuliert | [0, ∞) px | Total distance traveled (cumulative) by the center of mass or the respective marker. |
| Speed / Acc / Jerk | [0, ∞) | Velocity (px/s), acceleration (px/s²), and jerk (px/s³) represent the first, second, and third mathematical derivatives of position over time. |
| Fluidity | Ratio [0, ∞) | The ratio of speed to acceleration. Higher values indicate smoother motion (fewer abrupt changes in speed). |
| Flux | [0, ∞) | Kinematic energy flux (Speed * Acceleration). A combined measure of movement intensity. |
| Spread | [0, ∞) px | Spatial distribution. The average distance of all body markers from the current common center of mass (centroid). |
| BoundingBox_Area | [0, ∞) px² | Area of the smallest 2D rectangle (width * height) that encloses the entire body posture on screen in this frame. |
| KinEnergy_Win | [0, ∞) proxy | Proxy for kinetic energy (velocity²) averaged over the defined sliding window (e.g., 0.5 s). |
| Smoothness_Win | [0, 1] | A measure of the “smoothness” of motion, based on jerk. 1.0 = perfectly smooth, ~0.0 = extremely jerky/abrupt. |
| Contraction_Win | [0, ∞) px² | Average bounding box area over the time window. Shows the extent to which the body contracts or expands on screen over time. |
| DirChange_Win | [0, ∞) Deg | Accumulated changes in direction (angles in degrees) of the motion vectors over the time window. Shows a zigzag pattern. |
| EllipseSphericity | [0, 1] | Describes the spatial distribution of the markers (2D covariance matrix). 1.0 = perfectly circular posture; close to 0.0 = extremely flat or elongated posture. |
| PointsDensity | [0, ∞) 1/px² | Number of markers divided by the bounding box area. Indicates the visual compactness of the pose. |
| Equilibrium_Offset | [0, ∞) px | Horizontal distance (X-axis) between the center of gravity and the center of the ankles (base of support). An indicator of physical balance and forward/backward lean. |
| Suddenness_Win | [0, ∞) | The maximum jerk within the time window. Highlights sudden, unexpected surges. |
| Impulsivity_Win | [0, ∞) | Maximum acceleration within the window, scaled by the difference between the maximum and minimum energy (amplitude). |
| Lightness_Win | [-1, 1] | Ratio of vertical velocity to total velocity. Positive values = upward motion (light), negative values = downward motion (heavy). |
| InterPerson_Distance | [0, ∞) px | (Multi-person only) The absolute distance between the 2D centers of mass of two people on screen. |
| InterPerson_SpreadSymmetry | [0, 1] | (Multi-person only) Compares the “spread” (space occupied) of two people. 1.0 = exactly the same, 0.0 = extremely asymmetrical. |
| InterPerson_MovementSynchrony | [-1, 1] | (Multi-person only) Cosine similarity of the motion vectors (centers). 1.0 = moving in exactly the same direction; -1.0 = moving in opposite directions. |
| Symmetry_Distance | [0, 1] | Measures whether the left and right joints (e.g., wrists) are the same distance from the center. 1.0 = perfect symmetry. |
| Symmetry_Direction | [-1, 1] | Cosine similarity of the velocity vectors of the left and right joint pairs. 1.0 = moving synchronously in the same direction. |