Rintaro Otsubo

I’m a master’s student in HVRL at Keio University (Japan), under the supervision of Prof. Hideo Saito. I received my Bachelor’s degree in Computer Science from Keio University in 2025, and studied at RWTH Aachen University as an exchange student from 2023 to 2024.

My research focuses on computer vision and machine learning, including video understanding, sports vision, and few-shot learning.

News

Jul 2026 🎉 One paper accepted to IEEE Access (journal).

Jul 2026 MIRU 2026（長崎）で3件のポスター発表を予定しています。

Jul 2026 🇭🇰 Participated in the HKUST SENG Summer Camp for Elite Students 2026 with a program fee waiver.

Jun 2026 🎉 One paper accepted to CVPR Workshop 2026 (CVSports).

Oct 2025 🎉 Two papers accepted to ACM Multimedia Workshop 2025 (MMSports).

Aug 2025 共著発表が映像情報メディア学会年次大会学生優秀発表賞を受賞しました。

Aug 2025 MIRU 2025（京都）でポスター発表をしました。

Jun 2025 🏆 Ranked 5th in the SoccerNet 2025 Monocular Depth Estimation Challenge @ CVPR.

Apr 2025 Started my M.Eng. in Computer Science at Keio University.

Feb 2025 Presented posters at IW-FCV 2025 in Seoul, South Korea.

May 2024 🚀 Co-founded Hicrea Co.Ltd.

Oct 2023 🇩🇪 Started a one-year exchange program at RWTH Aachen University.

Apr 2021 Started my B.Eng. in Information and Computer Science at Keio University.

Publications

CryoAnomaly: Few-Shot Cryo-EM Particle Picking via Anomaly-Guided Hard Negative Suppression,
Riku Itsuji, Rintaro Otsubo, Ryo Fujii, Xingjian Li, Xiaolong Wu, Hideo Saito, Min Xu, IEEE Access
AnyGroundBench: A Specialized-Domain Benchmark for Video Grounding in Vision-Language Models,
Rintaro Otsubo*, Ryo Fujii*, Reina Ishikawa, Taiki Kanaya, Kanta Sawafuji, Hiroki Kajita, Shigeki Sakai, Hideo Saito, Ryo Hachiuma, Preprint, 2026 (* Equal contribution)
3D Reconstruction of American Football Game Situations from Handheld Monocular Video,
Kanta Sawafuji, Rintaro Otsubo, Dan Mikami, Hideo Saito, CVPR Workshop 2026 (CVSports)
Players Tracking and Identification for Minimap Generation in American Football,
Rintaro Otsubo, Kazami Ishii, Hideo Saito, ACM MMSports 2025
Hand-Held Multi-Object Tracking Dataset in American Football,
Rintaro Otsubo, Kanta Sawafuji, Hideo Saito, ACM MMSports 2025
SoccerNet 2025 Challenges Results,
Silvio Giancola et al,
arXiv preprint, 2025

Non-Refereed Publications

視覚言語モデルにおける動画グラウンディングのための専門領域ベンチマーク,
大坪麟太郎*, 藤井亮*, 石川玲奈, 金谷泰希, 澤藤幹太, 梶田大樹, 酒井成貴, 斎藤英雄, 八馬遼, 画像の認識・理解シンポジウムMIRU 2026, 長崎
単一の手持ちカメラ映像を用いたアメリカンフットボール試合状況の3次元再構成,
澤藤幹太, 大坪麟太郎, 三上弾, 斎藤英雄, 画像の認識・理解シンポジウムMIRU 2026, 長崎
幾何制約を用いた単眼サッカー放送映像からの複数選手3D骨格軌跡推定,
栗原拓也, 井辻陸, 大坪麟太郎, 岡直輝, 齋田和輝, 髙守柚佳, 長野紘士朗, 斎藤英雄, 画像の認識・理解シンポジウムMIRU 2026, 長崎
Jersey Number Recognition for American Football with SoccerNet Dataset,
Rintaro Otsubo, Kazami Ishii, Hideo Saito, IW-FCV 2025, Seoul, South Korea
Player Position Tracking Through Bird’s-Eye View Conversion of Handheld American Football Videos,
Kazami Ishii, Rintaro Otsubo, Hideo Saito, IW-FCV 2025, Seoul, South Korea
手持ちカメラで撮影されたアメリカンフットボール映像からの複数人物追跡,
大坪麟太郎, 澤藤幹太, 斎藤英雄, 画像の認識・理解シンポジウムMIRU 2025, 京都
アメリカンフットボールの試合映像を用いた選手視点からの試合状況のVR再現,
澤藤幹太, 大坪麟太郎, 斎藤英雄, 映像情報メディア学会2025年年次大会
サッカーネットチャレンジ2025におけるセグメンテーションを用いた単眼深度推定の改善,
阿部智樹, 影山雄士, 井辻陸, 大坪麟太郎, 澤藤幹太, 栗原拓也, 斎藤英雄, 映像情報メディア学会2025年年次大会

Awards and Scholarship

Ranked 5th in the SoccerNet 2025 Monocular Depth Estimation Challenge @ CVPR
映像情報メディア学会年次大会学生優秀発表賞（共著者）
KLL (Keio Leading-edge Laboratory of Science and Technology) Master’s Research Grant
Japan Student Organization (for the exchange program)
HKUST Funding for Summer Camp 2026

Academic Service

Reviewer for ACM MM Workshop (MMSports 2025, 2026)
Reviewer for IEEE CVPR Workshop (CVSports 2026)

Work Experience

hicrea logo Hicrea Co.Ltd, Tokyo, Japan May. 2024 – Present
Co-founder, ML Engineer
Released Vestory for inventory management and developed time series models for future sales.