02 報告 フェンシングの剣先表示システム (ソードトレーサー) 高橋正樹 横澤真介 三ッ峰秀樹 Sword Tracer : Visualization of Sword Trajectories in Fencing Masaki TAKAHASHI, Shinsuke YOKOZAWA and Hideki MITSUMINE 要 約 ABSTRACT 2 020年を見据えて,スポーツ競技の分析や理解 に対するニーズが高まっている。中でもフェンシ ングは,剣が高速で移動するため,スロー映像でもプ レーの詳細を理解することが困難な競技である。そこ で,赤外映像中から剣先領域を自動追跡し,その移動 軌跡をCG(Computer Graphics)でリアルタイムに 描画するシステム(ソードトレーサー)を開発した。赤 外画像と可視画像を同じ光軸で撮影可能なカメラを開 発し,赤外画像上の剣先領域を機械学習により追跡し て軌跡を描画した。2017年全日本フェンシング選手 権大会において,本システムを初めて運用し,放送に 使用した。本稿では,本システムの概要,評価実験の 結果,および中継での実運用の結果について報告する。 T his paper describes a system for visualizing sword trajectories in fencing. Fencing swords are very thin and move so fast that it is difficult for audiences to follow their movements. The system thus tracks the tips of the swords in the image coordinates and visualizes their movements with computer graphics (CGs). We call it “Sword Tracer.” Sword Tracer measures each sword’s position in the infrared (IR) image by detecting IR light reflected from reflective tape put on the tip of the sword. The system composites the trajectory CGs of the sword tips on the broadcast image in real-time. The system was used in the broadcast of the All Japan Fencing Championships in 2017 for the first time. 37 NHK技研 R&D ■ No.173 2019.1
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Sword Tracer : Visualization of Sword Trajectories …Sword Tracer : Visualization of Sword Trajectories in Fencing Masaki TAKAHASHI, Shinsuke YOKOZAWA and Hideki MITSUMINE 要 約
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02報 告フェンシングの剣先表示システム
(ソードトレーサー)高橋正樹 横澤真介 三ッ峰秀樹
Sword Tracer : Visualization of Sword Trajectories in FencingMasaki TAKAHASHI, Shinsuke YOKOZAWA and Hideki MITSUMINE
T h is paper descr ibes a sys tem for visualizing sword trajectories in fencing.
Fencing swords are very thin and move so fast that it is difficult for audiences to follow their movements. The system thus tracks t h e t i p s o f t h e s w o r d s i n t h e i m a g e coordinates and visualizes their movements with computer graphics (CGs). We call it “Sword Tracer.” Sword Tracer measures each sword’s position in the infrared (IR) image by detecting IR light reflected from reflective tape put on the tip of the sword. The system composites the trajectory CGs of the sword tips on the broadcast image in real-time. The system was used in the broadcast of the All Japan Fencing Championships in 2017 for the first time.
本稿は,ACM SIGGRAPH Proceedingsに掲載された以下の論文を元に加筆・修正したものである。M. Takahashi, S. Yokozawa, H. Mitsumine, T. Itsuki, M. Naoe and S. Funaki:“Sword Tracer: Visualization of Sword Trajectories in Fencing,” Proc. ACM SIGGRAPH 2018, doi: 10.1145/3214745.3214770, 2018.
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