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Björn Häfner
PhD StudentTechnical University of MunichSchool of Computation, Information and Technology
Informatics 9
Boltzmannstrasse 3
85748 Garching
Germany
Tel: +49-89-289-17784
Fax: +49-89-289-17757
Office: 02.09.053
Mail: bjoern.haefner@tum.de
Research Interests
I am interested in RGB-D data processing for 3D reconstruction using variational methods, especially photometric approaches and super-resolution.
Brief Bio
I received my B.Sc. in Mathematics from the OTH Regensburg in 2013 and my M.Sc. in Mathematics in Science and Engineering from the Technical University of Munich in 2016. Since mid November 2016, I have been a PhD student in the Computer Vision Group, headed by Prof. Dr. Daniel Cremers at TUM. In May 2019 I was a visiting Ph.D. student at the GREYC Image Group, Caen, France under supervision of Yvain Quéau. From September 2019 until February 2020 I was interning as Research Intern at Facebook Reality Labs in Cork, Ireland under supervision of Thomas Whelan. From July 2020 until November 2020 I was working part-time at Pro Unlimited @ Facebook as an External Research Collaborator to continue the project of my internship at Facebook Reality Labs. From August 2021 until December 2021 I have been interning as Research Intern at Facebook Reality Labs Research/Reality Labs Research (Meta) under supervision of Daniel Andersen.
Publications
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Book Chapters
2020
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On the Well-Posedness of Uncalibrated Photometric Stereo Under General Lighting , Chapter in (JD Durou, M Falcone, Y Quéau, S Tozza, eds.), Springer International Publishing, 2020.
Journal Articles
2022
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A Cutting-Plane Method for Sublabel-Accurate Relaxation of Problems with Product Label Spaces , In International Journal of Computer Vision (IJCV), 2022. ([code])
2020
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Photometric Depth Super-Resolution , In IEEE Transactions on Pattern Analysis and Machine Intelligence (TPAMI), volume 42, 2020. ([supp] [project page])
Preprints
2022
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SupeRVol: Super-Resolution Shape and Reflectance Estimation in Inverse Volume Rendering , In arXiv preprint arXiv:2212.04968, 2022. ([supp])
Conference and Workshop Papers
2023
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High-Quality RGB-D Reconstruction via Multi-View Uncalibrated Photometric Stereo and Gradient-SDF , In IEEE Winter Conference on Applications of Computer Vision (WACV), 2023. ([code] )
2021
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Sublabel-Accurate Multilabeling Meets Product Label Spaces , In DAGM German Conference on Pattern Recognition (GCPR), 2021. ([presentation] [code])
Oral Presentation [] 
Recovering Real-world Reflectance Properties and Shading from HDR Imagery , In International Conference on 3D Vision (3DV), 2021. ([supp] [slides] [poster] [FB Research] [video])
2020
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Inferring Super-Resolution Depth from a Moving Light-Source Enhanced RGB-D Sensor: A Variational Approach , In IEEE Winter Conference on Applications of Computer Vision (WACV), 2020. ([poster] [presentation] [code] [cvf])
Spotlight Presentation
2019
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Variational Uncalibrated Photometric Stereo under General Lighting , In IEEE/CVF International Conference on Computer Vision (ICCV), 2019. ([supp] [poster] [matlab] [python] [cvf])
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Photometric Segmentation: Simultaneous Photometric Stereo and Masking , In International Conference on 3D Vision (3DV), 2019. ([poster] [slides])
Spotlight Presentation
2018
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Fight ill-posedness with ill-posedness: Single-shot variational depth super-resolution from shading , In IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR), 2018. ([supp] [poster] [slides] [code] [cvf] [video])
Spotlight Presentation
2017
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Depth Super-Resolution Meets Uncalibrated Photometric Stereo , In IEEE International Conference on Computer Vision Workshops (ICCVW), 2017. ([code][slides] [cvf])
Oral Presentation at ICCV Workshop on Color and Photometry in Computer Vision
Talks
- Online @ Reality Labs Research (Meta), December 17 2021
- Cork City, Ireland @ Facebook Reality Labs, February 14 2020
- Quebec City, Canada @ 3DV spotlight presentation of our paper "Photometric Segmentation: Simultaneous Photometric Stereo and Masking", September 17 2019
- Berlin, Germany @ Zalando Research, August 22 2019
- Caen, France @ GREYC Image Group, May 27 2019
- Salt Lake City, Utah @ CVPR spotlight presentation of our paper "Fight ill-posedness with ill-posedness: Single-shot variational depth super-resolution from shading", June 19 2018
- Bologna, Italy @ SIAM Minisymposium on Recent Trends in Photometric 3D-reconstruction, June 7 2018
Reviewing Committee
| Conferences | Journals/Books |
|---|---|
| ECCV 2020 | Springer |
| ICCV 2019 | |
| CVPR 2019 |
Student Supervision
Successfully defended works:
| Name | Project | Topic | Co-Supervisor |
|---|---|---|---|
| Sinem Dalkılıç | Master's Thesis | "Bidirectional Reflectance Distribution Network" | Florian Hofherr, Lukas Köstler |
| Lisa Kaldich | Bachelor's Thesis | "A Raytracing Framework on the GPU using the NVIDIA OptiX API" | |
| Florian Windolf | Master's Thesis | "High Quality Depth Maps from RGB-D Keyframes using Shape-from-Shading" | Robert Maier |
| Lu Sang | Master's Thesis | "A Variational Approach to Depth Super-Resolution using Multi-View Photometric Stereo" Resulting Paper | |
| Christoph Kick | Master's Thesis | "Cook-Torrance BRDF and Surface Geometry recovery under Near-Light Illumination" | |
| Mohammed Brahimi | Master's Thesis | "Theoretical Analysis of the GBR and Lorentz Ambiguity of Uncalibrated Photometric Stereo" Resulting Paper | Yvain Quéau |
| Christoph Kick | Interdisciplinary Project in Mathematics | "Reflectance and geometry estimation using nonlinear optimization of the Cook-Torrance model" | Yvain Quéau |
| Alok Verma | Project Management and Software Development for Medical Applications | "Depth Super-Resolution using Shape-from-Shading and Reflectance Learning" Resulting Paper (Section 4) | Yvain Quéau |
Teaching
Summer 2023 - Seminar (organizer and supervisor)
Seminar: Recent Advances in 3D Computer Vision
(2h / 5 ECTS)
together with Marvin Eisenberger
Winter 2022/23 - Seminar (organizer and supervisor)
Seminar: Recent Advances in 3D Computer Vision
(2h / 5 ECTS)
together with Marvin Eisenberger
Summer 2021 - Seminar (organizer and supervisor)
Recent Advances in 3D Computer Vision
(2h / 5 ECTS)
together with Christiane Sommer and Mohammed Brahimi
Winter 2020/21 - Seminar (organizer and supervisor)
Seminar: Recent Advances in 3D Computer Vision
(2h / 5 ECTS)
together with Zorah Lähner and Mohammed Brahimi
Summer 2020 - Seminar (organizer and supervisor)
Seminar: The Evolution of Motion Estimation and Real-time 3D Reconstruction (2h / 5 ECTS)
together with Christiane Sommer and David Schubert
Summer 2019 - Seminar (organizer and supervisor)
Seminar: Recent Advances in 3D Computer Vision (2h / 5 ECTS)
together with Christiane Sommer
Winter 2018/19 - Seminar (organizer and supervisor)
Seminar: Recent Advances in 3D Computer Vision (2h / 5 ECTS)
together with Christiane Sommer
Summer 2018 - Practical Course (organizer, lecturer and tutor)
GPU Programming in Computer Vision (6h / 10 ECTS)
together with Robert Maier and David Schubert
Winter 2017/18 - Discrete Structures (tutor)
Diskrete Strukturen
Summer 2017 - Practical Course (organizer, lecturer and tutor)
GPU Programming in Computer Vision (6h / 10 ECTS)
together with Thomas Möllenhoff and Benedikt Löwenhauser
Connect
Find me on ResearchGate, Google Scholar, LinkedIn, Xing and GitHub
