Kai Kohyama
Email: kaikohyama[at]keio.jp
Work Experience
-
Sony Group Corporation, Tokyo, April 2026 - present
- R&D Engineer (AI)
Education
-
Keio University, Tokyo, April 2024 - March 2026
- Master of Engineering. School of Integrated Design Engineering
- Prof. Yoshimitsu Aoki
-
Keio University, Tokyo, April 2020 - March 2024
- Bachelor of Engineering. Electronics and Electrical Engineering
- Prof. Yoshimitsu Aoki
Internships
-
Research Engineer Internship, Sony Group, Inc. Feb. 2025
- Fine-tuned a video generation model for temporal consistency.
-
Research Engineer Internship, Preferred Networks, Inc. Aug. 2024 - Sep. 2024
- Reconstructed dynamic 3D Gaussian splatting from images without temporal information. [Slide] [Code & Data]
-
Research Engineer Internship, Tenchijin, Inc. Feb. 2024 - Feb.2026
- Analyzed satellite images.
-
Research Engineer Internship, REALITY, Inc. Feb.2023 - Aug. 2023
- Developed a system for creating avatars and motion using a head-mounted display. [Paper]
Awards
- Grand Prize in the Interverse Virtual Reality Challenge (IVRC), 2022. [link]
- Excellence Award in the IVRC Metaverse Section, 2023. [link (jp)]
- Keio University President's Encouragement Award, 2022. [link (jp)]
Publications
- Kai Kohyama, Yoshimitsu Aoki, Guillermo Gallego, Shintaro Shiba. “Geometric-Photometric Event-based 3D Gaussian Ray Tracing”, CVPR2026, 2026. [paper]
- Kai Kohyama, Shintaro Shiba, Yoshimitsu Aoki. “3D Human Scan With A Moving Event Camera”, CVPR Workshop on Computer Vision for Mixed Reality (CV4MR), 2024. [paper]
- Kai Kohyama, Alexandre Berthault, Takuma Kato, Akihiko Shirai. “AI-Assisted Avatar Fashion Show: Word-to-Clothing Texture Exploration and Motion Synthesis for Metaverse UGC”, ACM SIGGRAPH 2023 Posters, 2023. [paper]