About me

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)

Experience

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

Publications

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%)

International Conference (Non Peer-reviewed)

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

Domestic Conference (Non Peer-reviewed)

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

Awards

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. (2023, acceptance rate = 47.6%)
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

Projessional activities

Reviewer: CVPR2024, CVPR2025, ICCV2025, ICMI2025