Stefan Horst Sommer

Stefan Horst Sommer

Professor

ORCID: 0000-0001-6784-0328

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  1. Investigation of the adaptability of transient stability assessment methods to real-time operation

    Weckesser, T., Johannsson, H., Sommer, Stefan Horst & Østergaard, J., 2012, 2012 3rd IEEE PES International Conference and Exhibition on Innovative Smart Grid Technologies (ISGT Europe). IEEE, p. 1-9 9 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  2. Published

    On restricting planar curve evolution to finite dimensional implicit subspaces with non-Euclidean metric

    Tatu, A. J., Lauze, Francois Bernard, Sommer, Stefan Horst & Nielsen, Mads, 2010, In: Journal of Mathematical Imaging and Vision. 38, 3, p. 226-240 15 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  3. Published

    Atlas generative models and geodesic interpolation

    Stolberg-Larsen, J. & Sommer, Stefan Horst, 2022, In: Image and Vision Computing. 122, 23 p., 104433.

    Research output: Contribution to journal › Journal article › Research › peer-review

  4. Published

    Generalizations of Ripley’s K-function with Application to Space Curves

    Sporring, Jon, Waagepetersen, R. P. & Sommer, Stefan Horst, Jun 2019, Information Processing in Medical Imaging - 26th International Conference, IPMI 2019, Hong Kong, China, 2019, Proceedings: 26th International Conference, IPMI 2019, Hong Kong, China, June 2–7, 2019, Proceedings. Springer, p. 731-742 (Lecture Notes in Computer Science, Vol. 11492).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  5. Published

    Higher-order momentum distributions and locally affine LDDMM registration

    Sommer, Stefan Horst, Nielsen, Mads, Darkner, Sune & Pennec, X., 2013, In: S I A M Journal on Imaging Sciences. 6, 1, p. 341-367 27 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  6. Published

    Accelerating multi-scale flows for LDDKBM diffeomorphic registration

    Sommer, Stefan Horst, 2011, 2011 IEEE International Conference on Computer Vision Workshops (ICCV Workshops). IEEE, p. 499-505 7 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  7. Real-time thevenin impedance computation

    Sommer, Stefan Horst & Johannsson, H., 2013, Innovative Smart Grid Technologies (ISGT), 2013 IEEE PES. IEEE, p. 1-6 6 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  8. Published

    Bridge simulation and metric estimation on landmark manifolds

    Sommer, Stefan Horst, Arnaudon, A., Kühnel, L. & Joshi, S., 2017, Graphs in Biomedical Image Analysis, Computational Anatomy and Imaging Genetics: First International Workshop, GRAIL 2017, 6th International Workshop, MFCA 2017, and Third International Workshop, MICGen 2017, Held in Conjunction with MICCAI 2017, Québec City, QC, Canada, September 10–14, 2017, Proceedings. Cardoso, J., Arbel, T., Ferrante, E., Pennec, X., Dalca, A., Parisot, S., Batmanghelich, N. K., Sotiras, A., Nielsen, M., Sabuncu, M. R., Fletcher, T., Shen, L., Durrleman, S. & Sommer, S. (eds.). Springer, p. 79-91 13 p. (Lecture notes in computer science, Vol. 10551).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  9. Published

    Bicycle Chain Shape Models

    Sommer, Stefan Horst, Tatu, A. J., Chen, C., Jørgensen, D., de Bruijne, Marleen, Loog, M., Nielsen, Mads & Lauze, Francois Bernard, 2009, Computer Vision and Pattern Recognition Workshops, 2009. CVPR Workshops 2009. IEEE Computer Society Conference on Computer Vision and Pattern Recognition.. IEEE, p. 157-163 7 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  10. Published

    Introduction to differential and Riemannian geometry

    Sommer, Stefan Horst, Fletcher, T. & Pennec, X., 2020, Riemannian Geometric Statistics in Medical Image. Pennec, X., Sommer, S. & Fletcher, T. (eds.). Academic Press, p. 3-37

    Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

  11. Published

    Horizontal dimensionality reduction and iterated frame bundle development

    Sommer, Stefan Horst, 2013, Geometric Science of Information: First International Conference, GSI 2013, Paris, France, August 28-30, 2013. Proceedings. Nielsen, F. & Barbaresco, F. (eds.). Springer, p. 76-83 8 p. (Lecture notes in computer science, Vol. 8085).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  12. Published

    Sparsity and scale: compact representations of deformation for diffeomorphic registration

    Sommer, Stefan Horst, Nielsen, Mads & Pennec, X., 2012, 2012 IEEE Workshop on Mathematical Methods in Biomedical Image Analysis (MMBIA). IEEE, p. 217-224 8 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  13. Published

    Anisotropic distributions on manifolds: template estimation and most probable paths

    Sommer, Stefan Horst, 2015, Information processing in medical imaging: 24th International Conference, IPMI 2015, Sabhal Mor Ostaig, Isle of Skye, UK, June 28 - July 3, 2015, Proceedings. Ourselin, S., Alexander, D. C., Westin, C-F. & Cardoso, M. J. (eds.). Springer, p. 193-204 12 p. (Lecture notes in computer science, Vol. 9123).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  14. Published

    Sparse multi-scale diffeomorphic registration: the kernel bundle framework

    Sommer, Stefan Horst, Lauze, Francois Bernard, Nielsen, Mads & Pennec, X., 2013, In: Journal of Mathematical Imaging and Vision. 46, 3, p. 292-308 17 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  15. Published

    Anatomy in Curved Space: Non-linear Modeling of Deformation and Shape for Medical Imaging

    Sommer, Stefan Horst, 2012, Faculty of Science, University of Copenhagen.

    Research output: Book/Report › Ph.D. thesis › Research

  16. Published

    A multi-scale kernel bundle for LDDMM: towards sparse deformation description across space and scales

    Sommer, Stefan Horst, Nielsen, Mads, Lauze, Francois Bernard & Pennec, X., 2011, Information Processing in Medical Imaging: 22nd International Conference, IPMI 2011, Kloster Irsee, Germany, July 3-8, 2011. Proceedings. Székely, G. & Hahn, H. K. (eds.). Springer, p. 624-35 12 p. (Lecture notes in computer science, Vol. 6801).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  17. Published

    Kernel bundle EPDiff: Evolution equations for multi-scale diffeomorphic image registration

    Sommer, Stefan Horst, Lauze, Francois Bernard, Nielsen, Mads & Pennec, X., 2012, Scale Space and Variational Methods in Computer Vision - Third International Conference, SSVM 2011, Revised Selected Papers: Third International Conference, SSVM 2011, Ein-Gedi, Israel, May 29 – June 2, 2011, Revised Selected Papers. Bruckstein, A., ter Haar Romeny, B. M., Bronstein, A. M. & Bronstein, M. M. (eds.). Springer, p. 677-688 12 p. (Lecture notes in computer science, Vol. 6667).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  18. Published

    Modelling anisotropic covariance using stochastic development and sub-Riemannian frame bundle geometry

    Sommer, Stefan Horst & Svane, A. M., 2017, In: Journal of Geometric Mechanics. 9, 3, p. 391-410 20 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  19. Published

    Promoting active participation in computer science lectures

    Sommer, Stefan Horst, 2014, Improving university science teaching and learning: pedagogical projects 2014. Ulriksen, L. & Sølberg, J. (eds.). Department of Science Education, University of Copenhagen, p. 209-222 14 p. (Improving University Science Teaching and Learning - Pedagogical Projects; No. 1-2, Vol. 7).

    Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

  20. Published

    Manifold valued statistics, exact principal geodesic analysis and the effect of linear approximations

    Sommer, Stefan Horst, Lauze, Francois Bernard, Hauberg, S. & Nielsen, Mads, 2010, Computer Vision - ECCV 2010: 11th European Conference on Computer Vision, Heraklion, Crete, Greece, September 5-11, 2010, Proceedings, Part VI. Daniilidis, K., Maragos, P. & Paragios, N. (eds.). Springer, Vol. Part VI. p. 43-56 14 p. (Lecture notes in computer science; No. 6316).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  21. Published

    Reduction by Lie Group symmetries in diffeomorphic image registration and deformation modelling

    Sommer, Stefan Horst & Jacobs, H. O., 2015, In: Symmetry. 7, 2, p. 599-624 26 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  22. Published

    Evolution equations with anisotropic distributions and diffusion PCA

    Sommer, Stefan Horst, 2015, Geometric science of information: Second International Conference, GSI 2015, Palaiseau, France, October 28–30, 2015, Proceedings. Nielsen, F. & Barbaresco, F. (eds.). Springer Science+Business Media, p. 3-11 9 p. (Lecture notes in computer science, Vol. 9389).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  23. Published

    Optimization over geodesics for exact principal geodesic analysis

    Sommer, Stefan Horst, Lauze, Francois Bernard & Nielsen, Mads, 2014, In: Advances in Computational Mathematics. 40, 2, p. 283-313 31 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  24. Published

    Anisotropically weighted and nonholonomically constrained evolutions on manifolds

    Sommer, Stefan Horst, 2016, In: Entropy. 18, 12, 21 p., 425.

    Research output: Contribution to journal › Journal article › Research › peer-review

  25. Published

    Stochastic flows and shape bridges

    Sommer, Stefan Horst, Schauer, M. & Meulen, F. V. D., 2021, Statistics of Stochastic Differential Equations on Manifolds and Stratified Spaces (hybrid meeting). Mathematisches Forschungsinstitut Oberwolfach, p. 18-21 (Oberwolfach Reports; No. 48, Vol. 2021).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research

  26. Published

    Probabilistic approaches to geometric statistics: Stochastic processes, transition distributions, and fiber bundle geometry

    Sommer, Stefan Horst, 2020, Riemannian Geometric Statistics in Medical Image. Pennec, X., Sommer, S. & Fletcher, T. (eds.). Academic Press, p. 377-416

    Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

  27. Published

    Horizontal Flows and Manifold Stochastics in Geometric Deep Learning

    Sommer, Stefan Horst & Bronstein, A. M., 2021, In: IEEE Transactions on Pattern Analysis and Machine Intelligence. 44, 2, p. 811 - 822

    Research output: Contribution to journal › Journal article › Research › peer-review

  28. Published

    An Infinitesimal Probabilistic Model for Principal Component Analysis of Manifold Valued Data

    Sommer, Stefan Horst, 2019, In: Sankhya A. 81, 1, p. 37-62

    Research output: Contribution to journal › Journal article › Research › peer-review

  29. Published

    Reduce-factor-solve for fast Thevenin impedance computation and network reduction

    Sommer, Stefan Horst, Aabrandt, A. & Jóhannsson, H., 2019, In: IET Generation, Transmission and Distribution. 13, 2, p. 288-295

    Research output: Contribution to journal › Journal article › Research › peer-review

  30. Published

    Brain Segmentation in Rodent MR-Images Using Convolutional Neural Networks

    Sigurdsson, B., Darkner, Sune, Sommer, Stefan Horst, Mortensen, K. N., Sanggaard, S., Kostrikov, S. & Nedergaard, Maiken, 2018.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  31. Published

    A nonlinear mixed-effects model for simultaneous smoothing and registration of functional data

    Raket, L. L., Sommer, Stefan Horst & Markussen, Bo, 2014, In: Pattern Recognition Letters. 38, p. 1-7 7 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  32. Published

    Proceedings of the fifth international workshop on Mathematical Foundations of Computational Anatomy (MFCA 2015)

    Pennec, X. (ed.), Joshi, S. (ed.), Nielsen, Mads (ed.), Fletcher, T. P. (ed.), Durrleman, S. (ed.) & Sommer, Stefan Horst (ed.), 2015, INRIA. 173 p.

    Research output: Book/Report › Anthology › Research

  33. Published

    Proceedings of the Fourth International Workshop on Mathematical Foundations of Computational Anatomy - Geometrical and Statistical Methods for Biological Shape Variability Modeling (MFCA 2013), Nagoya, Japan

    Pennec, X. (ed.), Joshi, S. (ed.), Nielsen, Mads (ed.), Fletcher, T. P. (ed.), Durrleman, S. (ed.) & Sommer, Stefan Horst (ed.), 2013, INRIA. 134 p.

    Research output: Book/Report › Book › Research › peer-review

  34. Published

    Riemannian Geometric Statistics in Medical Image Analysis

    Pennec, X. (ed.), Sommer, Stefan Horst (ed.) & Fletcher, T. (ed.), 2020, 1. ed. Academic Press. 636 p.

    Research output: Book/Report › Book › Research › peer-review

  35. Published

    Introduction

    Pennec, X., Sommer, Stefan Horst & Fletcher, T., 2020, Riemannian Geometric Statistics in Medical Image Analysis. Pennec, X., Sommer, S. & Fletcher, T. (eds.). Academic Press, p. xvii-xix

    Research output: Chapter in Book/Report/Conference proceeding › Preface/postscript › Research › peer-review

  36. Published

    Do dementia biomarkers have a sigmoid trajectory? Insights from non-linear mixed effects modeling

    Pai, A. S. U., Sommer, Stefan Horst, Raket, L. L., Sørensen, L. & Nielsen, Mads, 2016, In: Alzheimer's & Dementia. 12, 7, Supplement, p. P356 1 p., O4-09-06.

    Research output: Contribution to journal › Conference abstract in journal › Research › peer-review

  37. Published

    Image registration using stationary velocity fields parameterized by norm-minimizing Wendland kernel

    Pai, A. S. U., Sommer, Stefan Horst, Sørensen, L., Darkner, Sune, Sporring, Jon & Nielsen, Mads, 2015, Medical Imaging 2015: Image Processing. SPIE - International Society for Optical Engineering, 7 p. (Proceedings of S P I E - International Society for Optical Engineering, Vol. 9413).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  38. Published

    Diffeomorphic image registration with automatic time-step adjustment

    Pai, A. S. U., Klein, S., Sommer, Stefan Horst, Darkner, Sune, Sporring, Jon & Nielsen, Mads, 2015, 2015 IEEE 12th International Symposium on Biomedical Imaging (ISBI). IEEE, p. 1085-1088 4 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  39. Published

    Comparison of several computational pipelines for atrophy computation in longitudinal Alzheimers studies

    Pai, A. S. U., Sommer, Stefan Horst, Darkner, Sune, Sørensen, L. E. B. L., Sporring, Jon & Nielsen, Mads, 2015. 1 p.

    Research output: Contribution to conference › Conference abstract for conference › Research › peer-review

  40. Published

    Characterization of errors in deep learning-based brain MRI segmentation

    Pai, A. S. U., Teng, Y., Blair, J. P. M., Kallenberg, M. G. J., Dam, Erik Bjørnager, Sommer, Stefan Horst, Igel, Christian & Nielsen, Mads, 2017, Deep learning for medical image analysis. Zhou, S. K., Greenspan, H. & Shen, D. (eds.). Academic Press, p. 223–242 20 p.

    Research output: Chapter in Book/Report/Conference proceeding › Book chapter › Research › peer-review

  41. Published

    Hippocampal texture predicts rate of cognitive decline in mild cognitive impairment

    Pai, A. S. U., Pillai, J. A., Sørensen, L., Darkner, Sune, Sommer, Stefan Horst & Nielsen, Mads, Jul 2017, In: Alzheimer's & Dementia. 13, 7, supplement, p. P1356 1 p., P4-225.

    Research output: Contribution to journal › Conference abstract in journal › Research

  42. Published

    Kernel bundle diffeomorphic image registration using stationary velocity fields and Wendland basis functions

    Pai, A. S. U., Sommer, Stefan Horst, Sørensen, L., Darkner, Sune, Sporring, Jon & Nielsen, Mads, 2016, In: IEEE Transactions on Medical Imaging. 35, 6, p. 1369-1380 12 p.

    Research output: Contribution to journal › Journal article › Research › peer-review

  43. Published

    Stepwise inverse consistent Euler’s scheme for diffeomorphic image registration

    Pai, A. S. U., Sommer, Stefan Horst, Darkner, Sune, Sørensen, L., Sporring, Jon & Nielsen, Mads, 2014, Biomedical Image Registration: 6th International Workshop, WBIR 2014, London, UK, July 7-8, 2014. Proceedings. Ourselin, S. & Modat, M. (eds.). Springer, p. 223-230 8 p. (Lecture notes in computer science, Vol. 8545).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  44. Published

    A statistical model for simultaneous template estimation, bias correction, and registration of 3D brain images

    Pai, A. S. U., Sommer, Stefan Horst, Raket, L. L., Kühnel, L., Darkner, Sune, Sørensen, L. & Nielsen, Mads, 2017, Medical Computer Vision and Bayesian and Graphical Models for Biomedical Imaging: MICCAI 2016 International Workshops, MCV and BAMBI, Athens, Greece, October 21, 2016, Revised Selected Papers. Müller, H., Kelm, B. M., Arbel, T., Cai, W., Cardoso, M. J., Langs, G., Menze, B., Metaxas, D., Montillo, A., Wells, W. M., Zhang, S., Chung, A. C. S., Jenkinson, M. & Ribbens, A. (eds.). Springer, p. 151-159 9 p. (Lecture notes in computer science, Vol. 10081).

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  45. Published

    Adaptive time-stepping in dieomorphic image registration with bounded inverse consistency error

    Pai, A. S. U., Klein, S., Sommer, Stefan Horst, Sørensen, L., Darkner, Sune, Sporring, Jon & Nielsen, Mads, 2015, Proceedings of the fifth international workshop on Mathematical Foundations of Computational Anatomy (MFCA 2015) . INRIA, p. 35-47

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  46. Published

    Adaptive time-stepping in diffeomorphic image registration with bounded inverse consistency error

    Pai, A. S. U., Klein, S., Sommer, Stefan Horst, Sørensen, L. E. B. L., Darkner, Sune, Sporring, Jon & Nielsen, Mads, 2015, The 18th International Conference on Medical Image Computing and Computer Assisted Intervention: proceedings. Technische Universität München , p. 35-47 13 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  47. Published

    PADDIT: Probabilistic Augmentation of Data using Diffeomorphic Image Transformation

    Orbes-Arteaga, M., Sørensen, L., Cardoso , J., Modat , M., Ourselin, S., Sommer, Stefan Horst, Nielsen, Mads, Igel, Christian & Pai, A. S. U., 2019, Proceedings, SPIE 10949, Medical Imaging 2019: Image Processing . SPIE - International Society for Optical Engineering, 6 p.

    Research output: Chapter in Book/Report/Conference proceeding › Article in proceedings › Research › peer-review

  48. Published

    ICLR 2022 Challenge for Computational Geometry & Topology: Design and Results

    Myers, A., Sanborn, S., Donnat, C. D. & Sommer, Stefan Horst, 2022. 8 p.

    Research output: Contribution to conference › Paper › Research

  49. Published

    Proceedings of Math on the rocks: shape analysis workshop in Grundsund

    Modin, K. (ed.) & Sommer, Stefan Horst (ed.), 2015, Chalmers tekniska högskola. 42 p.

    Research output: Book/Report › Book › Research › peer-review

  50. Published

    Serum AMH levels are lower in healthy boys who develop pubertal gynaecomastia

    Mieritz, M. G., Hagen, C. P., Almstrup, Kristian, Petersen, Jørgen Holm, Raket, L. L., Sommer, Stefan Horst & Juul, A., 2015, In: Hormone Research in Paediatrics. 84, Supplement 1, p. 290-291 2 p., P2-526.

    Research output: Contribution to journal › Conference abstract in journal › Research › peer-review

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