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ResearcherID: O-6413-2015
Scopus Author ID: 55926342800

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United Kingdom

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Employment (4)

City, University of London: London, GB

Employment
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City University London

City, University of London: London, GB

2023-09-01 to present | Lecturer (Department of Computer Science)
Employment
Source: Self-asserted source
Christos Tzelepis

Queen Mary University of London: London, London, GB

2018-03-01 to 2023-08-31 | Postdoctoral researcher (School of Electronic Engineering and Computer Science)
Employment
Source: Self-asserted source
Christos Tzelepis

Centre for Research and Technology Hellas Informatics and Telematics Institute: Thessaloniki, GR

2012-12-01 to 2018-02-28 | Research Assistant (Information Technologies Institute)
Employment
Source: Self-asserted source
Christos Tzelepis

Education and qualifications (2)

Queen Mary University of London: London, London, GB

2014-01-01 to 2018-06-01 | Doctor of Philosophy (PhD) (School of Electronic Engineering and Computer Science)
Education
Source: Self-asserted source
Christos Tzelepis

Aristotle University of Thessaloniki: Thessaloniki, GR

2005-10-01 to 2011-07-22 | 5-year Diploma (School of Electrical and Computer Engineering)
Education
Source: Self-asserted source
Christos Tzelepis

Works (50 of 58)

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Page 1 of 2

Bilinear Models of Parts and Appearances in Generative Adversarial Networks

IEEE Transactions on Pattern Analysis and Machine Intelligence
2024 | Journal article
DOI: 10.1109/TPAMI.2024.3415506
Contributors: James Oldfield; Christos Tzelepis; Yannis Panagakis; Mihalis A. Nicolaou; Ioannis Patras
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Ensembled Cold-Diffusion Restorations for Unsupervised Anomaly Detection

2024 | Book chapter
DOI: 10.1007/978-3-031-72120-5_23
Contributors: Sergio Naval Marimont; Vasilis Siomos; Matthew Baugh; Christos Tzelepis; Bernhard Kainz; Giacomo Tarroni
Source: check_circle
Crossref

One-Shot Neural Face Reenactment via Finding Directions in GAN’s Latent Space

International Journal of Computer Vision
2024-08 | Journal article
DOI: 10.1007/s11263-024-02018-6
Contributors: Stella Bounareli; Christos Tzelepis; Vasileios Argyriou; Ioannis Patras; Georgios Tzimiropoulos
Source: check_circle
Crossref
grade
Preferred source (of 2)‎

Improving Fairness using Vision-Language Driven Image Augmentation

2024 IEEE/CVF Winter Conference on Applications of Computer Vision (WACV)
2024-01-03 | Conference paper
DOI: 10.1109/wacv57701.2024.00463
SOURCE-WORK-ID:

318321
Contributors: Moreno D’Incà; Christos Tzelepis; Ioannis Patras; Nicu Sebe
Source: check_circle
City University London

"just to See You Smile": SMILEY, a Voice-Guided GUY GAN

WSDM 2023 - Proceedings of the 16th ACM International Conference on Web Search and Data Mining
2023 | Conference paper
DOI: 10.1145/3539597.3573031
EID:

2-s2.0-85149634299
Contributors: Yang, Q.; Tzelepis, C.; Nikolenko, S.; Patras, I.; Farseev, A.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Attribute-preserving Face Dataset Anonymization via Latent Code Optimization

arXiv
2023 | Other
DOI: 10.48550/arXiv.2303.11296
EID:

2-s2.0-85151088786

Part of ISSN: 23318422
Contributors: Barattin, S.; Tzelepis, C.; Patras, I.; Sebe, N.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

HyperReenact: One-Shot Reenactment via Jointly Learning to Refine and Retarget Faces

arXiv
2023 | Other
EID:

2-s2.0-85167697869

Part of ISSN: 23318422
Contributors: Bounareli, S.; Tzelepis, C.; Argyriou, V.; Patras, I.; Tzimiropoulos, G.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Parts of Speech–Grounded Subspaces in Vision-Language Models

arXiv
2023 | Other
EID:

2-s2.0-85162111664

Part of ISSN: 23318422
Contributors: Oldfield, J.; Tzelepis, C.; Panagakis, Y.; Nicolaou, M.A.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Self-Supervised Video Similarity Learning

arXiv
2023 | Other
EID:

2-s2.0-85165383356

Part of ISSN: 23318422
Contributors: Kordopatis-Zilos, G.; Tolias, G.; Tzelepis, C.; Kompatsiaris, I.; Patras, I.; Papadopoulos, S.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

StyleMask: Disentangling the Style Space of StyleGAN2 for Neural Face Reenactment

2023 IEEE 17th International Conference on Automatic Face and Gesture Recognition, FG 2023
2023 | Conference paper
DOI: 10.1109/FG57933.2023.10042744
EID:

2-s2.0-85149299865
Contributors: Bounareli, S.; Tzelepis, C.; Argyriou, V.; Patras, I.; Tzimiropoulos, G.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

DISYRE: Diffusion-Inspired SYnthetic REstoration for Unsupervised Anomaly Detection

2023-11-26 | Other
SOURCE-WORK-ID:

319635
Contributors: Sergio Naval Marimont; Matthew Baugh; Vasilis Siomos; Christos Tzelepis; Bernhard Kainz; Giacomo Tarroni
Source: check_circle
City University London

HyperReenact: One-Shot Reenactment via Jointly Learning to Refine and Retarget Faces

Proceedings / IEEE International Conference on Computer Vision. IEEE International Conference on Computer Vision
2023-10-01 | Conference paper
DOI: 10.1109/iccv51070.2023.00657
SOURCE-WORK-ID:

316162

Part of ISSN: 1550-5499
WOSUID:

WOS:001159644307038
Contributors: Stella Bounareli; Christos Tzelepis; Vasileios Argyriou; Ioannis Patras; Georgios Tzimiropoulos
Source: check_circle
City University London

Attribute-Preserving Face Dataset Anonymization via Latent Code Optimization

Proceedings / CVPR, IEEE Computer Society Conference on Computer Vision and Pattern Recognition. IEEE Computer Society Conference on Computer Vision and Pattern Recognition
2023-08-22 | Conference paper
DOI: 10.1109/cvpr52729.2023.00773
SOURCE-WORK-ID:

316145

Part of ISSN: 1063-6919
WOSUID:

WOS:001062522100001
Contributors: Simone Barattin; Christos Tzelepis; Ioannis Patras; Nicu Sebe
Source: check_circle
City University London

Self-Supervised Video Similarity Learning

Conference on Computer Vision and Pattern Recognition Workshops IEEE Computer Society Conference on Computer Vision and Pattern Recognition. Workshops
2023-06 | Conference paper
DOI: 10.1109/cvprw59228.2023.00504
SOURCE-WORK-ID:

316160

Part of ISSN: 2160-7508
Contributors: Giorgos Kordopatis-Zilos; Giorgos Tolias; Christos Tzelepis; Ioannis Kompatsiaris; Ioannis Patras; Symeon Papadopoulos
Source: check_circle
City University London

PandA: Unsupervised Learning of Parts and Appearances in the Feature Maps of GANs

2023-05-01 | Conference paper
SOURCE-WORK-ID:

316161
Contributors: James Oldfield; Christos Tzelepis; Yannis Panagakis; Mihalis Nicolaou; Ioannis Patras
Source: check_circle
City University London

Attribute-preserving Face Dataset Anonymization via Latent Code Optimization

2023-03-20 | Other
SOURCE-WORK-ID:

316691
Contributors: Simone Barattin; Christos Tzelepis; Ioannis Patras; Nicu Sebe
Source: check_circle
City University London

Parts of Speech-Grounded Subspaces in Vision-Language Models

Advances in Neural Information Processing Systems
2023-01-01 | Conference paper
SOURCE-WORK-ID:

318035

Part of ISSN: 1049-5258
Contributors: J Oldfield; Christos Tzelepis; Y Panagakis; M A Nicolaou; I Patras
Source: check_circle
City University London

ContraCLIP: Interpretable GAN generation driven by pairs of contrasting sentences

arXiv
2022 | Other
DOI: 10.48550/arXiv.2206.02104
EID:

2-s2.0-85132966483

Part of ISSN: 23318422
Contributors: Tzelepis, C.; Oldfield, J.; Tzimiropoulos, G.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

PANDA: UNSUPERVISED LEARNING OF PARTS AND APPEARANCES IN THE FEATURE MAPS OF GANS

arXiv
2022 | Other
DOI: 10.48550/arXiv.2206.00048
EID:

2-s2.0-85149882313

Part of ISSN: 23318422
Contributors: Oldfield, J.; Tzelepis, C.; Panagakis, Y.; Nicolaou, M.A.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

StyleMask: Disentangling the Style Space of StyleGAN2 for Neural Face Reenactment

arXiv
2022 | Other
DOI: 10.48550/arXiv.2209.13375
EID:

2-s2.0-85139184656

Part of ISSN: 23318422
Contributors: Bounareli, S.; Tzelepis, C.; Argyriou, V.; Patras, I.; Tzimiropoulos, G.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

DnS: Distill-and-Select for Efficient and Accurate Video Indexing and Retrieval

International Journal of Computer Vision
2022-10 | Journal article
DOI: 10.1007/s11263-022-01651-3
Contributors: Giorgos Kordopatis-Zilos; Christos Tzelepis; Symeon Papadopoulos; Ioannis Kompatsiaris; Ioannis Patras
Source: check_circle
Crossref
grade
Preferred source (of 3)‎

ContraCLIP: Interpretable GAN generation driven by pairs of contrasting sentences

2022-06-05 | Other
SOURCE-WORK-ID:

316692
Contributors: Christos Tzelepis; James Oldfield; Georgios Tzimiropoulos; Ioannis Patras
Source: check_circle
City University London

DnS: Distill-and-Select for Efficient and Accurate Video Indexing and Retrieval

arXiv
2021 | Other
DOI: 10.48550/arXiv.2106.13266
EID:

2-s2.0-85136315353

Part of ISSN: 23318422
Contributors: Kordopatis-Zilos, G.; Tzelepis, C.; Papadopoulos, S.; Kompatsiaris, I.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Estimating continuous affect with label uncertainty

2021 9th International Conference on Affective Computing and Intelligent Interaction, ACII 2021
2021 | Conference paper
DOI: 10.1109/ACII52823.2021.9597425
EID:

2-s2.0-85123359168
Contributors: Foteinopoulou, N.M.; Tzelepis, C.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
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Few-shot action localization without knowing boundaries

arXiv
2021 | Other
DOI: 10.48550/arxiv.2106.04150
EID:

2-s2.0-85169943765

Part of ISSN: 23318422
Contributors: Xie, T.-T.; Tzelepis, C.; Fu, F.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Few-shot action localization without knowing boundaries

ICMR 2021 - Proceedings of the 2021 International Conference on Multimedia Retrieval
2021 | Conference paper
DOI: 10.1145/3460426.3463643
EID:

2-s2.0-85114882810
Contributors: Xie, T.-T.; Tzelepis, C.; Fu, F.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
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Uncertainty propagation in convolutional neural networks: Technical report

arXiv
2021 | Other
EID:

2-s2.0-85101792997

Part of ISSN: 23318422
Contributors: Tzelepis, C.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

WarpedGANSpace: Finding non-linear RBF paths in GAN latent space

arXiv
2021 | Other
EID:

2-s2.0-85116659269

Part of ISSN: 23318422
Contributors: Tzelepis, C.; Tzimiropoulos, G.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

WarpedGANSpace: Finding non-linear RBF paths in GAN latent space

Proceedings of the IEEE International Conference on Computer Vision
2021 | Conference paper
DOI: 10.1109/ICCV48922.2021.00633
EID:

2-s2.0-85120299236

Part of ISSN: 15505499
Contributors: Tzelepis, C.; Tzimiropoulos, G.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

WarpedGANSpace: Finding non-linear RBF paths in GAN latent space

2021-09-27 | Other
SOURCE-WORK-ID:

316693
Contributors: Christos Tzelepis; Georgios Tzimiropoulos; Ioannis Patras
Source: check_circle
City University London

Uncertainty Propagation in Convolutional Neural Networks: Technical Report

2021-02-11 | Other
SOURCE-WORK-ID:

316695
Contributors: Christos Tzelepis; Ioannis Patras
Source: check_circle
City University London

Boundary uncertainty in a single-stage temporal action localization network

arXiv
2020 | Other
EID:

2-s2.0-85095516765

Part of ISSN: 23318422
Contributors: Xie, T.; Tzelepis, C.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

ITI-CERTH participation to TRECVID 2015

2015 TREC Video Retrieval Evaluation, TRECVID 2015
2020 | Conference paper
EID:

2-s2.0-85006764446
Contributors: Markatopoulou, F.; Ioannidou, A.; Tzelepis, C.; Mironidis, T.; Galanopoulos, D.; Arestis-Chartampilas, S.; Pittaras, N.; Avgerinakis, K.; Gkalelis, N.; Moumtzidou, A. et al.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Temporal action localization with variance-aware networks

arXiv
2020 | Other
DOI: 10.48550/arxiv.2008.11254
EID:

2-s2.0-85170300951

Part of ISSN: 23318422
Contributors: Xie, T.-T.; Tzelepis, C.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

ITI-CERTH participation to TRECVID 2015

2015 TREC Video Retrieval Evaluation, TRECVID 2015
2020-01-01 | Conference paper
SOURCE-WORK-ID:

273115
Contributors: F Markatopoulou; A Ioannidou; Christos Tzelepis; T Mironidis; D Galanopoulos; S Arestis-Chartampilas; N Pittaras; K Avgerinakis; N Gkalelis; A Moumtzidou et al.
Source: check_circle
City University London

A deep generic to specific recognition model for group membership analysis using non-verbal cues

Image and Vision Computing
2019 | Journal article
DOI: 10.1016/j.imavis.2018.09.005
EID:

2-s2.0-85059022030

Part of ISSN: 02628856
Contributors: Mou, W.; Tzelepis, C.; Mezaris, V.; Gunes, H.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Concept-Based and Event-Based Video Search in Large Video Collections

Big Data Analytics for Large-Scale Multimedia Search
2019 | Book chapter
Part of DOI: 10.1002/9781119376996.ch2
EID:

2-s2.0-85131496664
Contributors: Markatopoulou, F.; Galanopoulos, D.; Tzelepis, C.; Mezaris, V.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Concept‐Based and Event‐Based Video Search in Large Video Collections

2019-04-29 | Book chapter
DOI: 10.1002/9781119376996.ch2
SOURCE-WORK-ID:

316164

Part of ISBN: 9781119376972
Contributors: Foteini Markatopoulou; Damianos Galanopoulos; Christos Tzelepis; Vasileios Mezaris; Ioannis Patras
Source: check_circle
City University London

Multimedia processing essentials

Springer Series on Cultural Computing
2018 | Book chapter
DOI: 10.1007/978-3-319-73465-1_3
EID:

2-s2.0-85068176659

Part of ISSN: 21959064 21959056
Contributors: Apostolidis, K.; Markatopoulou, F.; Tzelepis, C.; Mezaris, V.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Linear Maximum Margin Classifier for Learning from Uncertain Data

IEEE Transactions on Pattern Analysis and Machine Intelligence
2018-12-01 | Journal article
DOI: 10.1109/TPAMI.2017.2772235
Contributors: Christos Tzelepis; Vasileios Mezaris; Ioannis Patras
Source: check_circle
Crossref
grade
Preferred source (of 3)‎

Maximum Margin Learning Under Uncertainty

2018-06-30 | Dissertation or Thesis
SOURCE-WORK-ID:

316146
Contributors: Christos Tzelepis; Ioannis Patras
Source: check_circle
City University London

Generic to Specific Recognition Models for Membership Analysis in Group Videos

Proceedings - 12th IEEE International Conference on Automatic Face and Gesture Recognition, FG 2017 - 1st International Workshop on Adaptive Shot Learning for Gesture Understanding and Production, ASL4GUP 2017, Biometrics in the Wild, Bwild 2017, Heterogeneous Face Recognition, HFR 2017, Joint Challenge on Dominant and Complementary Emotion Recognition Using Micro Emotion Features and Head-Pose Estimation, DCER and HPE 2017 and 3rd Facial Expression Recognition and Analysis Challenge, FERA 2017
2017 | Conference paper
DOI: 10.1109/FG.2017.69
EID:

2-s2.0-85026284717
Contributors: Mou, W.; Tzelepis, C.; Mezaris, V.; Gunes, H.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Event-based media processing and analysis: A survey of the literature

Image and Vision Computing
2016 | Journal article
DOI: 10.1016/j.imavis.2016.05.005
EID:

2-s2.0-84976481416

Part of ISSN: 02628856
Contributors: Tzelepis, C.; Ma, Z.; Mezaris, V.; Ionescu, B.; Kompatsiaris, I.; Boato, G.; Sebe, N.; Yan, S.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Learning to detect video events from zero or very few video examples

Image and Vision Computing
2016 | Journal article
DOI: 10.1016/j.imavis.2015.09.005
EID:

2-s2.0-84951299116

Part of ISSN: 02628856
Contributors: Tzelepis, C.; Galanopoulos, D.; Mezaris, V.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Video aesthetic quality assessment using kernel Support Vector Machine with isotropic Gaussian sample uncertainty (KSVM-IGSU)

Proceedings - International Conference on Image Processing, ICIP
2016 | Conference paper
DOI: 10.1109/ICIP.2016.7532791
EID:

2-s2.0-85006717192

Part of ISSN: 15224880
Contributors: Tzelepis, C.; Mavridaki, E.; Mezaris, V.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

Video event detection using kernel support vector machine with isotropic gaussian sample uncertainty (KSVM-iGSU)

Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics)
2016 | Book
DOI: 10.1007/978-3-319-27671-7_1
EID:

2-s2.0-84955280439

Part of ISSN: 16113349 03029743
Contributors: Tzelepis, C.; Mezaris, V.; Patras, I.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier
grade
Preferred source (of 2)‎

ITI-CERTH in TRECVID 2015 multimedia event detection

2015 TREC Video Retrieval Evaluation, TRECVID 2015
2015 | Conference paper
EID:

2-s2.0-85084731650
Contributors: Tzelepis, C.; Galanopoulos, D.; Arestis-Chartampilas, S.; Gkalelis, N.; Mezaris, V.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

ITI-CERTH participation to TRECVID 2015

2015 TREC Video Retrieval Evaluation, TRECVID 2015
2015 | Conference paper
EID:

2-s2.0-85009732297
Contributors: Markatopoulou, F.; Loannidou, A.; Tzelepis, C.; Mironidis, T.; Galanopoulos, D.; Arestis-Chartampilas, S.; Ras, N.P.; Avgerinakis, K.; Gkalelis, N.; Moumtzidou, A. et al.
Source: Self-asserted source
Christos Tzelepis via Scopus - Elsevier

Learning to detect video events from zero or very few video examples

Image and Vision Computing Journal, Elsevier, 2015
2015-11-25 | Other
SOURCE-WORK-ID:

316696
Contributors: Christos Tzelepis; Damianos Galanopoulos; Vasileios Mezaris; Ioannis Patras
Source: check_circle
City University London

Linear Maximum Margin Classifier for Learning from Uncertain Data

2015-04-15 | Other
SOURCE-WORK-ID:

316694
Contributors: Christos Tzelepis; Vasileios Mezaris; Ioannis Patras
Source: check_circle
City University London
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