Tim Büchner

Computer Vision Group Jena, Research Associate, PhD Student

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I am currently doing my PhD at the Computer Vision Group Jena at the Friedrich Schiller University Jena under Prof. Dr.-Ing. Joachim Denzler. My research focuses on developing new algorithms, especially for facial expression analysis in medical and psychological applications in the context of muscular activity. My focus is not only on 2D images but also 3D data, going into 4D data.

In the DFG project Bridging the Gap: Mimics and Muscles, we aim to combine 3D surface changes with the underlying muscle activity to understand facial expressions better. The project is a collaboration between the Computer Vision Group Jena and the Ear-Nose-Throat Clinic Jena under Prof. Dr. Orlando Guntinas-Lichius. Together, we combine our computer vision and medical science expertise to further the understanding of facial expressions for patients with facial palsy.

Another area I am currently investigating is understanding the black-box nature of deep learning models, especially in medical applications. We investigate whether human-defined properties (such as facial symmetry) significantly influence the internally learned decision rules of the model. Our goal is to make non-experts understand the decision-making process of deep learning models and improve their trust in the model’s predictions, especially in out-of-distribution scenarios.

news

Mar 20, 2025 🎉🎉 The CVPR EIFER project page is now live! Check it out!
Feb 27, 2025 🎉🎉 CVPR acceptance! 🎉🎉 (More coming soon!)

latest posts

Mar 04, 2025 About the Titans paper

selected publications

  1. buechner2023improved.png
    Improved Obstructed Facial Feature Reconstruction for Emotion Recognition with Minimal Change CycleGANs
    In Advanced Concepts for Intelligent Vision Systems (Acivs), 2023
    Best Paper Award
  2. buechner2023lets.png
    Let’s Get the FACS Straight - Reconstructing Obstructed Facial Features
    In International Conference on Computer Vision Theory and Applications (VISAPP), 2023
  3. vemuri2024functional.png
    Functional Tensor Decompositions for Physics-Informed Neural Networks
    Sai Karthikeya VemuriTim Büchner, Julia Niebling, and Joachim Denzler
    In International Conference on Pattern Recognition (ICPR), Dec 2024
    Best Paper Award
  4. buechner2024facing.png
    Facing Asymmetry - Uncovering the Causal Link between Facial Symmetry and Expression Classifiers using Synthetic Interventions
    In Asian Conference on Computer Vision (ACCV), Dec 2024
  5. buechner2025electromyography.png
    Electromyography-Informed Facial Expression Reconstruction for Physiological-Based Synthesis and Analysis
    arXiv preprint arXiv:2503.09556, Dec 2025
    Accepted at CVPR 2025