About me

• 
CV

• I am a Ph.D student at Toyota Technological Institute (Japan)． I'm now at Intelligent Information Media Lab working with Prof. Normichi Ukita.

  My research interest includes action recognition, especially in the context of group activity understanding.

  I've published papers on joint attention estimation (ICCV2023), group activity feature learning (CVPR2024), and people grouping (ICCV2025).

  I'm looking for a research internship. Please feel free to contact me. (E-mail: sd23501 [at] toyota-ti.ac.jp)

• 2018: Graduated from Asahigaoka High School
• 2021: Dropped out of Department of Advanced Science and Technology, Faculty of Engineering, Toyota Technological Institute (for early admission of a graduate school)
• 2023: Received Master of Engineering degree from Department of Advanced Science and Technology, Toyota Technological Institute (graduate at the top of the class)
• 2023/04-2024/03: Doctor of Philosophy in Engineering, Department of Electronics and Information Engineering, Toyota Technological Institute
• 2024/04-2024/09: Long-term internship at Hokkaido Nippon-Ham Fighters (analyst)
• 2024/10-present: Doctor of Philosophy in Engineering, Department of Electronics and Information Engineering, Toyota Technological Institute
• 2025/04-2025/06: Visitor at Idiap Research Institute

International Conference (Peer-reviewed)

• Kaname Yokoyama, Chihiro Nakatani, Norimichi Ukita
Dynamic Group Detection using VLM-augmented Temporal Groupness Graph

Proc. of IEEE International Conference on Computer Vision (ICCV2025), Oct., 2025. (acceptance rate = 24.0%)

• Chihiro Nakatani, Hiroaki Kawashima, Norimichi Ukita
Learning Group Activity Features Through Person Attribute Prediction

Proc. of IEEE Conference on Computer Vision & Pattern Recognition (CVPR2024), June, 2024. (acceptance rate = 23.6%)

• Chihiro Nakatani, Hiroaki Kawashima, Norimichi Ukita
Interaction-aware Joint Attention Estimation Using People Attributes

Proc. of IEEE International Conference on Computer Vision (ICCV2023), Oct., 2023. (acceptance rate = 26.15%)

• Chihiro Nakatani, Hiroaki Kawashima, Norimichi Ukita
Joint Learning with Group Relation and Individual Action

Proc. of the 18th International Conference on Machine Vision Applications (MVA2023), July, 2023. (oral acceptance rate = 16.5%)

• Daiki Mushiake, Kentaro Otomo, Chihiro Nakatani, Norimichi Ukita
Shape Preservation in Image Style Transfer for Gaze Estimation

Proc. of the 18th International Conference on Machine Vision Applications (MVA2023), July, 2023. (oral acceptance rate = 16.5%)

• Chihiro Nakatani, Kohei Sendo, Norimichi Ukita
Group Activity Recognition Using Joint Learning of Individual Action Recognition and People Grouping

Proc. of the 17th International Conference on Machine Vision Applications (MVA2021), July, 2021. (oral acceptance rate = 18.9%)

• Goutam Bhat, Martin Danelljan, Radu Timofte, et al. (include Chihiro Nakatani)
NTIRE 2022 Burst Super-Resolution Challenge

Proc. of New Trends in Image Restoration and Enhancement Workshop (NTIRE2022), CVPR Workshop, June, 2022

• 平野将三朗, 中谷千洋, 浮田宗伯
物体の相対的位置関係を用いた複数物体追跡

MIRU, 7月, 2025年

• 横山要, 中谷千洋, 浮田宗伯
視覚言語モデルによる画像の意味理解を考慮した動的グループ検出

MIRU, 7月, 2025年

• 手塚龍希, 中谷千洋, 浮田宗伯
DINOv2は複雑な複数人の相互作用を理解しているか？

MIRU, 7月, 2025年

• 平野将三朗, 中谷千洋, 浮田宗伯
物体の相対的位置関係を用いた複数物体追跡

情報処理学会研究報告CVIM, 5月, 2025年

• 横山要, 中谷千洋, 浮田宗伯
視覚言語モデルによる画像の意味理解を考慮した動的グループ検出

情報処理学会研究報告CVIM, 5月, 2025年

• 山下陽平, 中谷千洋, 浮田宗伯
服寸法に基づくサイズ可変仮想試着

情報処理学会研究報告CVIM, 3月, 2023年

• 中谷千洋, 川嶋宏彰, 浮田宗伯
スポーツ映像における視線集中を利用したボール検出

情報処理学会研究報告CVIM, 11月, 2021年

• 中谷千洋, 千藤滉平, 浮田宗伯
個人行動とグループ構成の同時学習によるグループ行動認識

情報処理学会研究報告CVIM, 5月, 2021年

• JST ASPIRE Kyoto Workshop Poster Award. (2025)

• International travel grant offered by the Telecommunications Advancement Foundation. (2024)

• International Conference Research Presentation Award from IEEE Nagoya Branch. (2024)

• International exchange grant offered by Tateishi Science and Technology Foundation. (2024)

• Scholarship offered by The Toyoaki Scholarship Foundation. (2023-2025)

• Scholarship offered by The Toyota Technological Institute. (2023-2025)

• SICE Outstanding Student Award. (March, 2023)

• Scholarship offered by The Toyota Scholarship Foundation. (2018-2021)

Internships

• Hokkaido Nippon-Ham Fighters (Analyst)

Hokkaido Japan; 2024/04-2024/09. Long-term internship

• OptFit Corporation (Server Side Engineer)

Aichi Japan; 2020. Part-time job

• Activate Data Corporation (Machine Learning Engineer)

Aichi Japan; 2019. Part-time job