From sports & exercise science to AI. I am Takashi Fukushima, a researcher and developer working across sports & exercise science, motion capture, and computer vision. My work focuses on markerless human pose estimation and AI-driven movement analysis, alongside XR development with Unity and Meta Quest.
Latest articles
- Motion Capture & Performance Analysis (a foundational overview)
A foundational overview: marker-based vs markerless pose estimation, the OpenPose/MediaPipe/MeTRAbs coordinate systems, ~10 degree accuracy and why errors happen, kinematics vs kinetics, capture frameworks, and a single-camera to OpenSim example. - How To Use OpenPose and OpenCap (free markerless motion capture)A practical getting-started guide to two free markerless motion-capture tools: OpenPose (install the demo, fix the models, run it) and OpenCap (2 iOS cameras, calibration, and 3D capture).
- The Math Behind Joint Angle Calculation (why atan2 works)The math behind atan2d(det, dot): the determinant is the cross-product magnitude (|a||b|sin), the dot product is |a||b|cos, so their ratio is tan – and why the two-argument atan2 preserves sign and handles angles beyond 90 degrees.
- Soccer Kick Analysis in MATLAB (from OpenPose data)A step-by-step MATLAB walkthrough: import OpenPose JSON, compute joint angles with atan2d, filter with Butterworth (cutoff from the power spectrum), find phases and landing, and export a results table.
- The Biomechanics of a Soccer Kick (Analyzed with OpenPose)Breaking a football kick down phase by phase with a slow-motion phone video and OpenPose – backswing, leg cocking, acceleration, and the supporting leg’s shock absorption and energy transfer, read from the joint-angle and angular-velocity curves.
- OpenPose and 3D Reconstruction – Part 5: Kinetic SimulationPart 5 (finale): kinetic/dynamic simulation with OpenSim Moco and automatic differentiation – muscle activations and ground reaction forces from the reconstructed motion.
Focus areas
- Human Pose Estimation (MediaPipe, OpenPose, latest methods)
- Motion Capture & Sports Biomechanics
- Computer Vision & AI movement analysis
- XR / Metaverse development with Unity & Meta Quest
プロフィール
Takashi Fukushima です。スポーツ科学・運動化学・モーションキャプチャ・コンピュータビジョンを横断して研究と開発を行っています。マーカーレスの姿勢推定（Human Pose Estimation）や AI を用いた動作分析を中心に、Unity・Meta Quest を使った XR 開発にも取り組んでいます。
研究・専門分野
- 姿勢推定 / Human Pose Estimation
- モーションキャプチャ・スポーツバイオメカニクス
- コンピュータビジョン・AI 動作分析
- Unity・Meta Quest を使った XR / メタバース開発
Links
- YouTube: Takashi Fukushima｜Sports Science & Pose Estimation
- GitHub: coming soon
- Papers: ORCID
- LinkedIn: coming soon
- Contact: coming soon