産業技術総合研究所主任研究員．2017年に五十嵐健夫教授の指導のもと東京大学大学院情報理工学系研究科博士課程を修了．博士（情報理工学）．2017年より産業技術総合研究所研究員，2022年より現職．コンピュータグラフィクスとヒューマンコンピュータインタラクションを専門とし，特に最適化計算などの数理的手法に基づくデザイン支援技術の研究に従事．ACM SIGGRAPH，CHI，UISTなどの学術会議で論文を発表している．また2021年より株式会社グラフィニカにて技術顧問を兼務し，映像制作のための研究開発にも従事．日本学術振興会育志賞（2017），東京大学大学院情報理工学系研究科研究科長賞（2017），情報処理学会山下記念研究賞（2014），Asiagraphics Young Researcher Award（2021）など20件以上受賞．
Yuki Tatsukawa, I-Chao Shen, Anran Qi, Yuki Koyama, Takeo Igarashi, and Ariel Shamir. 2024. FontCLIP: A Semantic Typography Visual-Language Model for Multilingual Font Applications. Comput. Graph. Forum 43, 2, pp.e15043:1–e15043:11 (2024). (a.k.a. Proceedings of Eurographics 2024)
Daichi Horita, Jiaolong Yang, Dong Chen, Yuki Koyama, Kiyoharu Aizawa, and Nicu Sebe. 2023. A Structure-Guided Diffusion Model for Large-Hole Image Completion. In Proceedings of the 34th British Machine Vision Conference (BMVC 2023), pp.258:1–258:15.
Yuki Koyama and Masataka Goto. 2022. BO as Assistant: Using Bayesian Optimization for Asynchronously Generating Design Suggestions. In Proceedings of the 35th Annual ACM Symposium on User Interface Software and Technology (UIST '22), pp.77:1–77:14.
Kenta Yamamoto, Yuki Koyama, and Yoichi Ochiai. 2022. Photographic Lighting Design with Photographer-in-the-Loop Bayesian Optimization. In Proceedings of the 35th Annual ACM Symposium on User Interface Software and Technology (UIST '22), pp.92:1–92:11.
Hiromu Yakura, Yuki Koyama, and Masataka Goto. 2021. Tool- and Domain-Agnostic Parameterization of Style Transfer Effects Leveraging Pretrained Perceptual Metrics. In Proceedings of the 30th International Joint Conference on Artificial Intelligence (IJCAI '21), pp.1208–1216.
Takayuki Nakatsuka, Kento Watanabe, Yuki Koyama, Masahiro Hamasaki, Masataka Goto, and Shigeo Morishima. 2021. Vocal-Accompaniment Compatibility Estimation Using Self-Supervised and Joint-Embedding Techniques. IEEE Access 9, pp.101994–102003 (2021).
Takayuki Nakatsuka, Kazuyoshi Yoshii, Yuki Koyama, Satoru Fukayama, Masataka Goto, and Shigeo Morishima. 2021. MirrorNet: A Deep Reflective Approach to 2D Pose Estimation for Single-Person Images. Journal of Information Processing 29, pp.406–423 (2021).
Masa Ogata and Yuki Koyama. 2021. A Computational Approach to Magnetic Force Feedback Design. In Proceedings of 2021 CHI Conference on Human Factors in Computing Systems (CHI '21), pp.284:1–284:12.
Yijun Zhou, Yuki Koyama, Masataka Goto, and Takeo Igarashi. 2021. Interactive Exploration-Exploitation Balancing for Generative Melody Composition. In Proceedings of the 26th International Conference on Intelligent User Interfaces (IUI '21), pp.43–47.
Yijun Zhou, Yuki Koyama, Masataka Goto, and Takeo Igarashi. 2020. Generative Melody Composition with Human-in-the-Loop Bayesian Optimization. In Proceedings of the 2020 Joint Conference on AI Music Creativity (CSMC-MuMe 2020), pp.21:1–21:10.
Tomoyasu Nakano, Yuki Koyama, Masahiro Hamasaki, and Masataka Goto. 2020. Interactive Deep Singing-Voice Separation Based on Human-in-the-Loop Adaptation. In Proceedings of the 25th International Conference on Intelligent User Interfaces (IUI '20), pp.78–82.
Yuki Koyama and Masataka Goto. 2019. Precomputed Optimal One-Hop Motion Transition for Responsive Character Animation. Visual Comput. 35, 6–8, pp.1131–1142 (2019). (a.k.a. Proceedings of CGI 2019)
Yuki Koyama and Masataka Goto. 2018. Decomposing Images into Layers with Advanced Color Blending. Comput. Graph. Forum 37, 7, pp.397–407 (2018). (a.k.a. Proceedings of Pacific Graphics 2018)
Yuki Koyama and Masataka Goto. 2018. OptiMo: Optimization-Guided Motion Editing for Keyframe Character Animation. In Proceedings of 2018 CHI Conference on Human Factors in Computing Systems (CHI '18), pp.161:1–161:12.
Eisuke Fujinawa, Shigeo Yoshida, Yuki Koyama, Takuji Narumi, Tomohiro Tanikawa, and Michitaka Hirose. 2017. Computational Design of Hand-Held VR Controllers Using Haptic Shape Illusion. In Proceedings of the 23rd ACM Symposium on Virtual Reality Software and Technology (VRST '17), pp.28:1–28:10.
Yuki Koyama, Issei Sato, Daisuke Sakamoto, and Takeo Igarashi. 2017. Sequential Line Search for Efficient Visual Design Optimization by Crowds. ACM Trans. Graph. 36, 4, pp.48:1–48:11 (2017). (a.k.a. Proceedings of SIGGRAPH 2017)
Morihiro Nakamura, Yuki Koyama, Daisuke Sakamoto, and Takeo Igarashi. 2016. An Interactive Design System of Free-Formed Bamboo-Copters. Comput. Graph. Forum 35, 7, pp.323–332 (2016). (a.k.a. Proceedings of Pacific Graphics 2016)
Lasse Farnung Laursen, Yuki Koyama, Hsiang-Ting Chen, Elena Garces, Diego Gutierrez, Richard Harper, and Takeo Igarashi. 2016. Icon Set Selection via Human Computation. In Proceedings of Pacific Graphics 2016—Short Papers, pp.1–6.
Kazutaka Nakashima, Yuki Koyama, Takeo Igarashi, Takashi Ijiri, Shin Inada, and Kazuo Nakazawa. 2016. Interactive Deformation of Structurally Complex Heart Models Constructed from Medical Images. In Proceedings of Eurographics 2016—Short Papers, pp.49–52.
Yuki Koyama, Daisuke Sakamoto, and Takeo Igarashi. 2016. SelPh: Progressive Learning and Support of Manual Photo Color Enhancement. In Proceedings of the 2016 CHI Conference on Human Factors in Computing Systems (CHI '16), pp.2520–2532.
Yuki Koyama, Shinjiro Sueda, Emma Steinhardt, Takeo Igarashi, Ariel Shamir, and Wojciech Matusik. 2015. AutoConnect: Computational Design of 3D-Printable Connectors. ACM Trans. Graph. 34, 6, pp.231:1–231:11 (2015). (a.k.a. Proceedings of SIGGRAPH Asia 2015)
Yuki Koyama, Daisuke Sakamoto, and Takeo Igarashi. 2014. Crowd-Powered Parameter Analysis for Visual Design Exploration. In Proceedings of the 27th Annual ACM Symposium on User Interface Software and Technology (UIST '14), pp.65–74.
Nobuyuki Umetani, Yuki Koyama, Ryan Schmidt, and Takeo Igarashi. 2014. Pteromys: Interactive Design and Optimization of Free-formed Free-flight Model Airplanes. ACM Trans. Graph. 33, 4, pp.65:1–65:10 (2014). (a.k.a. Proceedings of SIGGRAPH 2014)
Yuki Koyama and Takeo Igarashi. 2013. View-Dependent Control of Elastic Rod Simulation for 3D Character Animation. In Proceedings of the 12th ACM SIGGRAPH/Eurographics Symposium on Computer Animation (SCA '13), pp.73–78.
Yuki Koyama, Kenshi Takayama, Nobuyuki Umetani, and Takeo Igarashi. 2012. Real-Time Example-Based Elastic Deformation. In Proceedings of the 11th ACM SIGGRAPH/Eurographics Symposium on Computer Animation (SCA '12), pp.19–24.
Other Publications
Daichi Horita, Jiaolong Yang, Dong Chen, Yuki Koyama, and Kiyoharu Aizawa. 2023. A Structure-Guided Diffusion Model for Large-Hole Diverse Image Completion. In Proceedings of CVPR 2023 Workshops: Generative Models for Computer Vision, pp.22:1–22:6.
Yuki Koyama, Toby Chong, and Takeo Igarashi. 2022. Preferential Bayesian Optimisation for Visual Design. In Bayesian Methods for Interaction and Design (Eds. John H. Williamson, Antti Oulasvirta, Per Ola Kristensson, and Nikola Banovic), Cambridge University Press, pp.239–258.
Yuki Koyama, Takeshi Tsuruta, Heisuke Saito, Daisuke Takizawa, and Hiroshi Moriguchi. 2021. A Procedural MatCap System for Cel-Shaded Japanese Animation Production. In SIGGRAPH Asia 2021 Posters, pp.34:1–34:2.
Yonghao Yue, Yuki Koyama, Issei Sato, and Takeo Igarashi. 2021. User Interfaces for High-Dimensional Design Problems: From Theories to Implementations. In ACM SIGGRAPH 2021 Courses, pp.11:1–11:34.
Yuki Koyama. 2021. Introduction to Computational Design. In Extended Abstracts of the 2021 CHI Conference on Human Factors in Computing Systems (CHI EA '21—Courses), pp.136:1–136:4.
Ariel Shamir, Niloy J. Mitra, Nobuyuki Umetani, and Yuki Koyama. 2020. Intelligent Tools for Creative Graphics. In ACM SIGGRAPH 2020 Courses, pp.15:1–15:11.
Tomoyasu Nakano, Yuki Koyama, Masahiro Hamasaki, and Masataka Goto. 2019. Autocomplete Vocal-fo Annotation of Songs Using Musical Repetitions. In Proceedings of the 24th International Conference on Intelligent User Interfaces Companion (IUI '19 Companion—Demos and Posters), pp.71–72.
Shoki Miyagawa, Yuki Koyama, Jun Kato, Masataka Goto, and Shigeo Morishima. 2018. Placing Music in Space: A Study on Music Appreciation with Spatial Mapping. In Proceedings of the 2018 ACM Conference Companion Publication on Designing Interactive Systems (DIS '18 Companion—Provocations & Works in Progress), pp.39–43.
Yuki Koyama and Takeo Igarashi. 2018. Computational Design with Crowds. In Computational Interaction (Eds. Antti Oulasvirta, Per Ola Kristensson, Xiaojun Bi, and Andrew Howes), Oxford University Press, pp.153–184.
Antti Oulasvirta, Yuki Koyama, Ranjitha Kumar, Daniele Panozzo, and Jürgen Steimle. 2017. Computational Design. In Dagstuhl Reports: Computational Interactivity (Dagstuhl Seminar 17232) (Eds. Xiaojun Bi, Otmar Hilliges, Takeo Igarashi, and Antti Oulasvirta), pp.65–66.(Note: Antti Oulasvirta wrote the summary of the group discussion at the seminar.)
Yuki Koyama. 2017. Crowdsourcing Visual Design. In Dagstuhl Reports: Computational Interactivity (Dagstuhl Seminar 17232) (Eds. Xiaojun Bi, Otmar Hilliges, Takeo Igarashi, and Antti Oulasvirta), p.57.
Yuki Koyama. 2016. Computational Design Driven by Aesthetic Preference. In Adjunct Proceedings of the 29th Annual ACM Symposium on User Interface Software and Technology (UIST '16 Adjunct—Doctoral Symposium), pp.1–4.
Yuki Koyama, Daisuke Sakamoto, and Takeo Igarashi. 2016. Supporting Photo Color Enhancement by Progressively Learning Aesthetic Preference. In Proceedings of ACM CHI 2016 Symposium on Emerging Japanese HCI Research Collection, pp.11–15.
Yuki Koyama, Daisuke Sakamoto, and Takeo Igarashi. 2015. Crowd-Powered Parameter Analysis for Computational Design Exploration. In ACM SIGGRAPH 2015 Posters (SIGGRAPH '15 Posters), p.2:1.
Thesis
Yuki Koyama. 2017. Computational Design Driven by Visual Aesthetic Preference. Ph.D. Thesis, The University of Tokyo. Supervised by Prof. Takeo Igarashi.
Yuki Koyama. 2014. View-Dependent Control of Elastic Rod Simulation for 3D Character Animation. Master's Thesis, The University of Tokyo. Supervised by Prof. Takeo Igarashi.
Yuki Koyama. 2012. Real-Time Example-Based Elastic Deformation. Bachelor's Thesis, The University of Tokyo. Supervised by Prof. Takeo Igarashi.
Talks
Yuki Koyama. Human-in-the-Loop Preferential Bayesian Optimization for Visual Design. The 10th International Conference on Computational Visual Media (CVM 2022)(Keynote Talk). 2022/04/09.
Jun Kato, Yuki Koyama, Tatsuo Yotsukura, and Koya Imamura. R&D for Anime Production: State-of-the-Art and Future Prospects. SIGGRAPH Asia 2021 Featured Sessions. 2021/12/16.
Norihiko Miyoshi, Heisuke Saito, Hiroshi Moriguchi, Naoki Ao, Takashi Horiuchi, Takeshi Tsuruta, Yuki Koyama, and Hiroki Omae. Unity Anime Toolbox: The Key to Creating Studio Quality Animation in a Real-Time Engine. SIGGRAPH Asia 2021 Featured Sessions. 2021/12/15.
Yuki Koyama. Computational Design with Human Assessment. The 1st International Symposium on Intelligence Design (ISID '21). 2021/03/15.
Yuki Koyama. Sequential Gallery for Interactive Visual Design Optimization. SIGGRAPH 2020 Birds of a Feather: What is Happening in Japanese CG Research and Industry Now?. 2020/08/25.
Yuki Koyama. Sequential Line Search for Efficient Visual Design Optimization by Crowds. ACM SIGGRAPH Theater Event: SIGGRAPH in Japanese + Japan CG Showcase. 2017/07/30.
Kazuo Nakazawa, Shin Inada, Ryo Haraguchi, Takashi Ashihara, Isao Shiraishi, Ken-ichi Kurosaki, Suzu Kanzaki, Takeo Igarashi, Takashi Ijiri, Yuki Koyama, and Takanori Ikeda. Technological Development of Heart Simulators for Various Computer Platforms in the Medical and Health-care Fields. 第78回日本循環器学会学術集会 トピック. 2014年3月.
