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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: foot_contact_frame
  • Required for QA: False
  • Detection Method: Velocity-based analysis
  • Threshold: 0.2 m/s vertical velocity for 5 consecutive frames

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Description

Foot contact marks the moment when the lead foot fully makes contact with the ground and begins accepting weight.
Determined by finding the max downward velocity of the lead ankle after max foot raise, then searching forward for 5 consecutive frames with an ankle vertical velocity below 0.2 m/s.” Foot contact is crucial for timing analysis and is used as a reference point for many other swing event and metrics.

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Use Cases

  • Stride timing analysis
  • Swing sequence timing
  • Balance and stability assessmentS