Tommy Mitchel
Thomas (Tommy) Mitchel
Senior Research Scientist, PlayStation
My research interests include equivariant and geometric deep learning, graphics, vision, and harmonic analysis with a particular focus on developing novel tools for analyzing, understanding, and manipulating 3D geometry.

I received my PhD from Johns Hopkins University in 2022 advised by Misha Kazhdan. Prior to joining PlayStation, I was a postdoctoral fellow at Google Research hosted by Ameesh Makadia.

thomas.w.mitchel@gmail.com





Software and Datasets
Conformal SHREC '11: A challanging shape classification dataset for benchmarking conformally-equivariant networks (10 Gb)
TS2Kit [Doc]: Differentiable Spherical Harmonic Transforms in PyTorch
ECHO Descriptors: State-of-the-art intrisic surface feature descriptors
Publications
icon Neural Isometries: Taming Transformations for Equivariant ML
Thomas W. Mitchel, Michael Taylor, Vincent Sitzmann
arXiv 2024

[arXiv]   [
BibTex

@misc{mitchel2024NIso,
title={Neural Isometries: Taming Transformations for Equivariant ML},
author={Thomas W. Mitchel and Michael Taylor and Vincent Sitzmann},
year={2024},
eprint={2405.19296},
archivePrefix={arXiv},
primaryClass={cs.CV}}

]  


icon Single Mesh Diffusion Models With Field Latents for Texture Generation
Thomas W. Mitchel, Carlos Esteves, Ameesh Makadia
CVPR 2024

[Website]   [arXiv]   [
BibTex

@misc{mitchel2023FieldLatents,
title={Single Mesh Diffusion Models with Field Latents for Texture Generation},
author={Thomas W. Mitchel and Carlos Esteves and Ameesh Makadia},
year={2023},
eprint={2312.09250},
archivePrefix={arXiv},
primaryClass={cs.CV}}

]  


icon Möbius Convolutions for Spherical CNNs
Thomas W. Mitchel, Noam Aigerman, Vladimir G. Kim, and Michael Kazhdan
SIGGRAPH 2022

[Code]   [Talk]   [
BibTex

@inproceedings{mitchelMob22,
author = {Mitchel, Thomas W. and Aigerman, Noam and Kim, Vladimir G. and Kazhdan, Michael},
title = {M\"{o}bius Convolutions for Spherical CNNs},
year = {2022},
isbn = {9781450393379},
publisher = {Association for Computing Machinery},
address = {New York, NY, USA},
url = {https://doi.org/10.1145/3528233.3530724},
doi = {10.1145/3528233.3530724},
booktitle = {ACM SIGGRAPH 2022 Conference Proceedings},
articleno = {30},
numpages = {9},
location = {Vancouver, BC, Canada},
series = {SIGGRAPH '22}}

]  


icon Extending Convolution Through Spatially Adaptive Alignment
Thomas W. Mitchel
PhD Thesis, Johns Hopkins University, 2022

[
BibTex

@phdthesis{mitchel2022ext,
author = {Mitchel, Thomas W.},
title = {Extending Convolution Through Spatially Adaptive Alignment},
school = {Johns Hopkins University},
month = {October},
year = {2022}

]  


icon Field Convolutions for Surface CNNs
Thomas W. Mitchel, Vladimir G. Kim, and Michael Kazhdan
ICCV 2021 (Oral)

[Supplemental]   [Code]   [Talk]   [
BibTex

@article{mitchel2021Field,
author = {Mitchel, Thomas W. and Aigerman, Noam and Kim, Vladimir G. and Kazhdan, Michael},
title = {Field Convolutions for Surface CNNs},
booktitle = {Proceedings of the IEEE/CVF International Conference on Computer Vision (ICCV)},
month = {October},
year = {2021},
pages = {10001-10011}}

]  


icon ECHO: Extended Convolution Histogram of Orientations for Local Surface Description
Thomas W. Mitchel, Szymon Rusinkiewicz, Gregory S. Chirikjian, and Michael Kazhdan
Computer Graphics Forum, 2021

[Code]   [
BibTex

@article{mitchel2021ECHO,
author = {Mitchel, Thomas W. and Rusinkiewicz, Szymon and Chirikjian, Gregory S. and Kazhdan, Michael},
title = {ECHO: Extended Convolution Histogram of Orientations for Local Surface Description},
journal = {Computer Graphics Forum},
volume = {40},
number = {1},
pages = {180-194},
doi = {https://doi.org/10.1111/cgf.14181},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/cgf.14181},
year = {2021}}

]  


icon Continuous Body 3D Reconstruction of Limbless Animals
Qiyuan Fu*, Thomas W. Mitchel*, Jin Seob Kim, Gregory S. Chirikjian, and Chen Li *(Equally contributing authors)
Journal of Experimental Biology, 2021

[Supplemental]   [Code]   [
BibTex

@article{FuBody2021,
author = {Fu, Qiyuan and Mitchel, Thomas W. and Kim, Jin Seob and Chirikjian, Gregory S. and Li, Chen},
title = "{Continuous Body 3-D Reconstruction of Limbless Animals}",
journal = {Journal of Experimental Biology},
volume = {224},
number = {6},
year = {2021},
month = {03},
issn = {0022-0949},
doi = {10.1242/jeb.220731},
url = {https://doi.org/10.1242/jeb.220731}}

]  


icon Efficient Spatially Adaptive Convolution and Correlation
Thomas W. Mitchel, Benedict Brown, David Koller, Tim Weyrich, Szymon Rusinkiewicz, Michael Kazhdan
arXiv, 2020

[
BibTex

@misc{mitchelExtConv2020,
doi = {10.48550/ARXIV.2006.13188},
url = {https://arxiv.org/abs/2006.13188},
author = {Mitchel, Thomas W. and Brown, Benedict and Koller, David and Weyrich, Tim and Rusinkiewicz, Szymon and Kazhdan, Michael},
keywords = {Computer Vision and Pattern Recognition (cs.CV), Graphics (cs.GR), FOS: Computer and information sciences, FOS: Computer and information sciences},
title = {Efficient Spatially Adaptive Convolution and Correlation},
publisher = {arXiv},
year = {2020}}

]  


icon Quotienting Impertinent Camera Kinematics for 3D Video Stabilization
Thomas W. Mitchel, Christian Wüelker, Jin Seob Kim, Sipu Ruan, Gregory S. Chirikjian
ICCV 2019 Advances in Image Manipulation Workshop

[
BibTex

@InProceedings{Mitchel_2019_ICCV_Workshops,
author = {Mitchel, Thomas W. and Wulker, Christian and Seob Kim, Jin and Ruan, Sipu and Chirikjian, Gregory S.},
title = {Quotienting Impertinent Camera Kinematics for 3D Video Stabilization},
booktitle = {Proceedings of the IEEE/CVF International Conference on Computer Vision (ICCV) Workshops},
month = {Oct},
year = {2019} }

]  


icon Snakes Partition Their Body to Traverse Large Steps Stably
Sean W. Gart, Thomas W. Mitchel, Chen Li
Journal of Experimental Biology, 2019

[Supplemental]   [
BibTex

@article{gartSnakes2019,
author = {Gart, Sean W. and Mitchel, Thomas W. and Li, Chen},
title = "{Snakes partition their body to traverse large steps stably}",
journal = {Journal of Experimental Biology},
volume = {222},
number = {8},
year = {2019},
month = {04},
issn = {0022-0949},
doi = {10.1242/jeb.185991},
url = {https://doi.org/10.1242/jeb.185991}}

]  



icon Improving the Propulsion Speed of a Heaving Wing Through Artificial Evolution of Shape
Sophie Ramananarivo, Thomas W. Mitchel, Leif Ristroph
Proceedings of the Royal Society A, 2019

[
BibTex

@article{ramananWings2019,
author = {Ramananarivo, Sophie and Mitchel, Thomas and Ristroph, Leif },
title = {Improving the propulsion speed of a heaving wing through artificial evolution of shape},
journal = {Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences},
volume = {475},
number = {2221},
pages = {20180375},
year = {2019},
doi = {10.1098/rspa.2018.0375},
url = {https://royalsocietypublishing.org/doi/abs/10.1098/rspa.2018.0375}}

]