Giorgos Tolias

associate professor - CTU in Prague / Fac. of Electrical Engineering / Dep. of Cybernetics
computer vision researcher - Visual Recognition Group

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I am an associate professor at CTU in Prague and a researcher leading a team at the Visual Recognition Group (VRG). I received my PhD in December 2013 from NTUA, Greece, under the supervision of Yannis Avrithis and Stefanos Kollias. From 2014 to 2015, I was a postdoctoral researcher at Inria Rennes, France, working with Hervé Jégou. In 2015, I moved to Prague for a postdoc at CTU with Ondřej Chum.

My team has been supported by a 5 years “Junior Star” starting grant (2021-2025) from the Czech science foundation (GACR), a Standard GACR grant (2026-2028), and two MSCA post-doctoral fellowships. My research focuses on computer vision, particularly on visual representation learning and crafting, vision-language models, as well as large-scale object retrieval and recognition, among other topics. I also care about the responsible use of AI and remain opposed to potential military and surveillance applications. Despite my work with digital images, my heart still belongs to analog photography and the darkroom, where I continue to enjoy working with film.

news

Jun 20, 2026 one paper accepted at ECCV 2026.
Jun 15, 2026 organizing the instance-level recognition and generation workshop at ECCV 2026
Jun 15, 2026 organizing the CV4GOOD workshop at ECCV 2026
Feb 25, 2026 three papers accepted at CVPR 2026 (one oral and award candidate, one highlight) and one at the findings workshop.
Feb 20, 2026 two papers accepted at ICLR 2026.

team

post-doc Bill Psomas
phd student Nikos Efthymiadis co-advised with Ondrej Chum
phd student Pavel Suma
phd student Vladan Stojnic
phd student Tilemachos Aravanis
close collaborator Giorgos Kordopatis-Zilos


awards

outstanding reviewer award at CVPR '25, '21, '20, '18, '17, ICCV '17, BMVC '17


grants

2026 - 2028 Standard GACR
2025 google grant - googler-initiated research gift
2021 - 2025 Junior Star GACR (starting grant)


organization

2025 instance-level recognition and generation workshop ICCV'25
2023 visual copy detection workshop CVPR'23
2021 image similarity challenge competition NeurIPS'21
2020 - 2024 instance-level recognition workshop ECCV'20 ICCV'21 ECCV'22 ECCV'24
2018 - 2019 large-scale landmark recognition workshop CVPR'18 CVPR'19
2016 - 2018 computer vision and sports summer school (VS3) 2016 2017 2018


tutorials

2021 - 2023 large-scale visual localization CVPR '23 ICCV '21
2017 - 2019 large-scale visual place recognition and image-based localization ICCV '19 ICCV '21


community service

area chair ECCV'26 CVPR'26 ICCV'25 ECCV'24 ECCV'22
associate editor IJCV (2022-today)
reviewer (regularly) CVPR ICCV ECCV WACV
reviewer (occasionally) NeurIPS BMVC
reviewer (past) ACM MM


teaching

2025 - today advanced deep learning (23% share, bc/msc)
2021 - today computer vision methods (23% share, msc)
2017 - today reading group in pattern recognition and computer vision (50% share, doctoral/msc)


selected publications

complete publication list
  1. ECCV
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    Invisible Shortcuts: Why Vision Encoders Know Your Camera
    Vladan Stojnić, Ryan Ramos, Giorgos Kordopatis-Zilos, and 2 more authors
    In ECCV, 2026
  2. CVPR
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    Retrieve and Segment: Are a Few Examples Enough to Bridge the Supervision Gap in Open-Vocabulary Segmentation?
    Tilemachos Aravanis, Vladan Stojnic, Bill Psomas, and 2 more authors
    2026
  3. CVPR
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    SPAR: Single-Pass Any-Resolution ViT for Open-vocabulary Segmentation
    Naomi Kombol, Ivan Martinovic, Sinisa Segvic, and 1 more author
    2026
  4. CVPR
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    Global-Aware Edge Prioritization for Pose Graph Initialization
    Tong Wei, Giorgos Tolias, Jiri Matas, and 1 more author
    2026
  5. ICLR
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    Attention, Please! Revisiting Attentive Probing Through the Lens of Efficiency
    Bill Psomas, Dionysis Christopoulos, Eirini Baltzi, and 6 more authors
    2026
  6. ICLR
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    ELViS: Efficient Visual Similarity from Local Descriptors that Generalizes Across Domains
    Pavel Suma, Giorgos Kordopatis-Zilos, Yannis Kalantidis, and 1 more author
    2026
  7. NeurIPS
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    Instance-Level Composed Image Retrieval
    Bill Psomas, George Retsinas, Nikos Efthymiadis, and 5 more authors
    In NeurIPS, 2025
  8. ICCV
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    Processing and acquisition traces in visual encoders: What does CLIP know about your camera?
    Ryan Ramos, Vladan Stojnić, Giorgos Kordopatis-Zilos, and 3 more authors
    In ICCV, 2025
  9. CVPR
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    ILIAS: Instance-Level Image retrieval At Scale
    Giorgos Kordopatis-Zilos, Vladan Stojnić, Anna Manko, and 7 more authors
    In CVPR, 2025
  10. CVPR
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    LPOSS: Label Propagation Over Patches and Pixels for Open-vocabulary Semantic Segmentation
    Vladan Stojnic, Yannis Kalantidis, Jiri Matas, and 1 more author
    In CVPR, 2025
  11. ECCV
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    AMES: Asymmetric and Memory-Efficient Similarity Estimation for Instance-level Retrieval
    Pavel Suma, Giorgos Kordopatis-Zilos, Ahmet Iscen, and 1 more author
    In ECCV, 2024
  12. CVPR
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    Label Propagation for Zero-shot Classification with Vision-Language Models
    Vladan Stojnic, Yannis Kalantidis, and Giorgos Tolias
    In CVPR, 2024