Patricio Guerrero


My work lies in the field of inverse problems, computational imaging and speech processing, particularly applied to reconstruction algorithms with numerical optimization tools. Currently I am studying the use of bilevel optimization, automatic differentiation and proximal algorithms for both imaging and speech applications.

Research interests


  • Inverse problems in imaging/speech; variational, Bayesian and numerical approaches
  • Convex optimization / Bayesian sampling / machine-learning-related methods
  • HPC implementations for imaging/speech: analytical and iterative algorithms

Software



Publications


  1. N. Khoeiniha, P. Guerrero, T. van Leeuwen, W. Dewulf. Bayesian Uncertainty Quantification and Regularized Reconstruction for CT-Based Dimensional Metrology . Journal of Nondestructive Evaluation, 2025.

  2. M. Bahrkazemi, A. Rohde, J. Hess, S. Gondrom-Linke, P. Guerrero, W. Dewulf. Towards industrially relevant total variation based reconstruction of few-view computed tomography by exploiting noise level estimation . CIRP Journal of Manufacturing Science and Technology, 2025.

  3. P. Guerrero, S. Bellens, W. Dewulf. (preprint) FISTA-Condat-Vu: Automatic Differentiation for Hyperparameter Learning in Variational Models, 2024. PDF (ARXIV).

  4. P. Guerrero, S. Bellens, R. Santander, W. Dewulf. Automatic and Computationally Efficient Alignment in Fan- and Cone-Beam Tomography. IEEE Transactions on Computational Imaging, 2024. PDF (ARXIV).

  5. S. Bellens, P. Guerrero, P. Vandewalle, W. Dewulf. Machine learning in industrial X-ray computed tomography - a review. CIRP Journal of Manufacturing Science and Technology, 2024.

  6. S. Bellens, P. Guerrero, M. Janssens, P. Vandewalle, W. Dewulf. Machine learning based sinogram interpolation for X-ray computed tomography validated on experimental data. Precision Engineering, 2024.

  7. S. Bellens, P. Guerrero, M. Janssens, P. Vandewalle, W. Dewulf. Direct voxel classification from x-ray projections for 3D pore detection applied to laser sintered parts. Measurement Science and Technology, 2024.

  8. S. Bellens, P. Guerrero, M. Janssens, P. Vandewalle, W. Dewulf. Deep learning reconstruction of few-view X-ray CT measurements of mono-material objects with validation in additive manufacturing. CIRP Annals, 2024.

  9. P. Guerrero, M. Bernardi, E. Miqueles. Alternative Fan-beam Backprojection and Adjoint Operators. Journal of Inverse and Ill-Posed Problems, 2023. PDF (ARXIV).

  10. R. Kang, P. Guerrero, G. Probst, P. Slaets, W. Dewulf. Reference free method for robot CT imaging geometry estimation . Precision Engineering, 2022.

  11. E. Miqueles, P. Guerrero. Automatic regularization for tomographic image reconstruction. Results in Applied Mathematics, 2020.

  12. E. Miqueles, Gilberto Martinez Jr, P. Guerrero. Fast image reconstruction at a synchrotron laboratory. Proceedings of the 2020 SIAM Conference on Parallel Processing for Scientific Computing, 2020.

  13. P. Guerrero, M. K. Nguyen, L. Dumas, S. X. Cohen. Modelling of a New Compton Imaging Modality for an In-depth Characterisation of Flat Heritage Objects . Proceedings of The 9th EUROSIM Congress on Modelling and Simulation, 2018.

  14. P. Guerrero, M. K. Nguyen, L. Dumas, S. X. Cohen. Three dimensional imaging of flat natural and cultural heritage objects by a Compton scattering modality. Journal of Electronic Imaging, 26(1), 2017.

  15. K. Rannou, E. Crouzet, C. Ronin, P. Guerrero, G. Thuret, P. Gain, J.C. Pinoli, Y. Gavet. Comparison of corneal endothelial mosaic according to the age: the corimmo 3D project. IRBM, 37 (2), 2016.

Communications


  • June 2026. Automatic Differentiation of Proximal Algorithms in Bilevel Learning for Imaging
    SIAM Conference on Optimization 2026, Edinburgh, Scotland
    SLIDES

  • July 2025. A Primal-Dual algorithm with Krylov subspace projection for X-ray computed tomography
    Applied Inverse Problems 2025, Rio de Janeiro, Brazil
    SLIDES

  • June 2024. Oral presentation : Proximal Splitting Algorithms and Langevin Monte-Carlo Methods for Few-View Tomography
    SIAM Conference on Imaging Science 2024, Atlanta, USA

  • November 2023. Invited talk : Alignment and regularized reconstructions in tomography as optimization problems
    IX Conference of Ecuadorian mathematicians in Paris, Institut Henri Poincaré, Paris, France
    SLIDES

  • June 2023. Oral presentation : Fast Misalignment Correction in Cone-Beam Tomography via Variable Projection
    SIAM Conference on Optimization 2023, Seattle, USA

  • September 2021. Oral presentation : A low-complexity fan-beam tomographic backprojection formula
    IFIP TC7 Conference on System Modelling and Optimization, Quito, Ecuador

  • December 2020. Invited seminar : Low-complexity tomographic backprojections for high-resolution imaging techniques
    Computational Imaging CWI seminar, CWI, Amsterdam, Netherlands

  • February 2020. Co-author : Fast image reconstruction at a synchrotron laboratory, by E. Miqueles
    SIAM Conference on Parallel Processing for Scientific Computing 2020, Seattle, USA

  • November 2019. Oral presentation : Strategies for image reconstruction at Sirius
    29th RAU LNLS/CNPEM Annual Users Meeting, Campinas, Brazil

  • March 2019. Invited seminar : Three-dimensional imaging of flat samples from Compton Scattering
    Synchrotron Soleil, Gif-sur-Yvette, France

  • April 2017. Oral presentation : X-ray tomography and the Radon transform
    III Conference of Ecuadorian mathematicians in Paris, Institut Henri Poincaré, Paris, France

  • September 2016. Oral presentation : Modelling of a New Compton Imaging Modality for an In-Depth Characterisation of Flat Heritage Objects
    The 9th EUROSIM International Congress on Modelling and Simulation, Oulu, Finland

  • June 2016. Co-author : Age de l'endothélium cornéen humain, by Klervi Rannou
    Journées stéphanoises de cytométrie et d'imagerie 2016, Saint-Etienne, France

  • May 2016. Oral presentation : Backprojection of a conical Radon Transform in Compton scatter tomography
    Congrès National d'Analyse Numérique 2016, Obernai, France

  • May 2016. Seminar : Une nouvelle modalité d'imagerie basée sur le rayonnement X diffusé
    PhD seminar, LMV - UVSQ, Versailles, France

  • April 2016. Poster : Reconstruction des objets à partir de la diffusion inélastique
    II Conference of Ecuadorian mathematicians in Paris, Institut Henri Poincaré, Paris, France

  • April 2016. Seminar : Transformée de Radon conique. Inversion par rétroprojection filtrée.
    Analysis - PDE seminar, LMV - UVSQ, Versailles, France

  • March 2016. Poster : In-depth imaging of flat objects through a backprojection reconstruction of a 2D conical Radon Transform
    Atelier scientifique Matériaux du patrimoine et patrimoine matériel, École Polytechnique, Paris

  • October 2014 . Co-author : Spatial statistical analysis of the human corneal endothelial mosaic, by K. Rannou
    European Association for Vision and Eye Research Annual Meeting 2014, Nice, France