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A Method for Detecting Preliminary Actions During an Actual Karate Kumite Match
Kwangyun Kim1, Shuhei Tsuchida2, Tsutomu Terada1
1Graduate School of Engineering, Kobe University, 1-1 Rokkodai-Cho, Nada-Ku, Kobe 657-8501, Hyogo, Japan.
Sensors (Basel, Switzerland)
|July 12, 2025
Summary
This study introduces a new method to detect subtle pre-attack movements in karate kumite. The improved technique accurately identifies pre-actions during sparring, enhancing performance analysis.
Area of Science:
- Sports Science
- Biomechanics
- Karate Performance Analysis
Background:
- Kumite sparring requires minimizing pre-actions to conceal attack timing.
- Pre-actions are subtle and difficult to detect with conventional motion analysis.
- Previous methods failed in dynamic kumite due to misinterpreting footwork.
Purpose of the Study:
- To develop a novel method for detecting pre-actions in karate kumite.
- To overcome limitations of previous methods in distinguishing footwork from pre-actions.
Main Methods:
- Proposed a new method combining inertial sensor data with advanced preprocessing.
- Utilized an autocorrelation function to identify and smooth footwork segments.
- Separated footwork segments from attack technique segments for accurate analysis.
Main Results:
- The new method successfully detects pre-actions during actual kumite matches.
- Achieved an accuracy of 0.875 in estimating the presence or absence of pre-action.
- Effectively addressed misrecognition issues caused by footwork.
Conclusions:
- The proposed method enables accurate pre-action detection in dynamic kumite scenarios.
- This advancement can significantly improve karate training and performance feedback.
- Offers a reliable tool for analyzing subtle movements in combat sports.
