〈実践・事例報告〉2001年に開催された世界柔道選手権大会における男子の卓越した立ち技の動作解析

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  • <Practical investigations and case studies> Motion Analysis of the Outstanding Stand Technique for Men in the World Judo Championship held in 2001
  • 2001ネン ニ カイサイ サレタ セカイ ジュウドウ センシュケン タイカイ ニ オケル ダンシ ノ タクエツ シタ タチワザ ノ ドウサ カイセキ

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[Abstract]The motion of the outstanding stand technique for men in the World Judo Championship held in 2001 was analyzed by using commercially available video data. The video data was disassembled into frame data called AVI, which is a file format for storing audio and video information developed by Microsoft Corp. The motions performed by participants while using Judo standing techniques were analyzed using a software system based on "Open CV ", which is an open source library for computer vision and image processing developed by Intel Corp. The positions of parts of the body were indicated manually on to the AVI pictures based on the "frame by frame playback" technique, then put into a computer. The compensation of pixel values to the real space size was performed by using the known length of the "tatami " in the AVI picture. By repeating these, the positions of the body were traced corresponding to the video frame rate. The compensated positional data of the body was gathered and then disassembled into x direction-time data and y direction-time data to calculate velocity. In this manner, the velocity of the specified body parts of the thrown opponent were calculated. The subject selected was a 100 kg male. When he threw his opponent down, his motion of his stand technique of "Uchi-mata" ,"O-uchigari ", "O-soto-gari ", and "Seoi-nage" were analyzed. This is a case study of motion analysis of Judo using commercially available video data. We have given an example of an analysis method for Judo from an engineering point of view.

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