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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: ball_contact_frame
  • Required for QA: True
  • Primary Detection: Audio signal analysis
  • Secondary Detection: Swing through event
  • Validation: Audio-based ball contact must occur between foot contact and end twist events. If not, uses swing through event (when the rear wrist passes in front of the lead wrist).

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Description

Ball contact represents the instant when the bat makes contact with the ball. This is detected primarily through audio analysis, using a model to identify the hit “crack”. The secondary detection method (swing through event) is useful for capturing environment where other athletes are hitting. Audio-based ball contact detection could pick up other nearby hitters nearby.

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Use Cases

  • Largely determines body and bat metrics at ball contact
  • Swing sequence completion
  • Must occur in correct sequence, otherwise fails QA.