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Technical Details

  • Variable Type: Event
  • Data Type: Integer
  • Units: Frame number
  • Column Name: ball_release_frame
  • Required for QA: True
  • Measurement: Estimated timing of ball release

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Description

Release marks the estimated instant when the ball is released from the pitcher’s hand, representing the end of the acceleration phase. Detected via one of 3 methods:
  1. peak wrist velocity in the horizontal pelvis
  2. peak wrist height
  3. peak elbow extension angle

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Use Cases

  • Arm slot angle
  • Pitch completion & timing