no code implementations • Findings (NAACL) 2022 • Christos Papadopoulos, Yannis Panagakis, Manolis Koubarakis, Mihalis Nicolaou
We test our proposed method on finetuning multiple natural language understanding tasks by employing BERT-Large as an instantiation of the Transformer and the GLUE as the evaluation benchmark.
no code implementations • 26 Sep 2023 • Georgia Kourmouli, Nikos Kostagiolas, Yannis Panagakis, Mihalis A. Nicolaou
We present a locality-aware method for interpreting the latent space of wavelet-based Generative Adversarial Networks (GANs), that can well capture the large spatial and spectral variability that is characteristic to satellite imagery.
no code implementations • 20 Sep 2023 • Manos Plitsis, Theodoros Kouzelis, Georgios Paraskevopoulos, Vassilis Katsouros, Yannis Panagakis
In this work, we investigate the personalization of text-to-music diffusion models in a few-shot setting.
no code implementations • 31 Jul 2023 • Triantafyllos Kefalas, Yannis Panagakis, Maja Pantic
The implicit assumption of this task is that the sound signal is either missing or contains a high amount of noise/corruption such that it is not useful for processing.
no code implementations • 27 Jun 2023 • Triantafyllos Kefalas, Yannis Panagakis, Maja Pantic
Most established approaches to date involve a two-step process, whereby an intermediate representation from the video, such as a spectrogram, is extracted first and then passed to a vocoder to produce the raw audio.
1 code implementation • 23 May 2023 • James Oldfield, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras
In this paper, we propose to separate representations of the different visual modalities in CLIP's joint vision-language space by leveraging the association between parts of speech and specific visual modes of variation (e. g. nouns relate to objects, adjectives describe appearance).
no code implementations • 9 Mar 2023 • Vicky Kouni, Yannis Panagakis
Finally, the validity of our theory is assessed and numerical comparisons to a state-of-the-art unfolding network are made, on synthetic and real-world datasets.
2 code implementations • 3 Aug 2022 • Nikos Kostagiolas, Mihalis A. Nicolaou, Yannis Panagakis
In recent years, considerable advancements have been made in the area of Generative Adversarial Networks (GANs), particularly with the advent of style-based architectures that address many key shortcomings - both in terms of modeling capabilities and network interpretability.
1 code implementation • 31 May 2022 • James Oldfield, Christos Tzelepis, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras
Recent advances in the understanding of Generative Adversarial Networks (GANs) have led to remarkable progress in visual editing and synthesis tasks, capitalizing on the rich semantics that are embedded in the latent spaces of pre-trained GANs.
no code implementations • 14 May 2022 • Vicky Kouni, Yannis Panagakis
We present a new deep unfolding network for analysis-sparsity-based Compressed Sensing.
no code implementations • 14 Feb 2022 • Xiaoxi Wei, A. Aldo Faisal, Moritz Grosse-Wentrup, Alexandre Gramfort, Sylvain Chevallier, Vinay Jayaram, Camille Jeunet, Stylianos Bakas, Siegfried Ludwig, Konstantinos Barmpas, Mehdi Bahri, Yannis Panagakis, Nikolaos Laskaris, Dimitrios A. Adamos, Stefanos Zafeiriou, William C. Duong, Stephen M. Gordon, Vernon J. Lawhern, Maciej Śliwowski, Vincent Rouanne, Piotr Tempczyk
Task 2 is centred on Brain-Computer Interfacing (BCI), addressing motor imagery decoding across both subjects and data sets.
no code implementations • 1 Feb 2022 • Stylianos Bakas, Siegfried Ludwig, Konstantinos Barmpas, Mehdi Bahri, Yannis Panagakis, Nikolaos Laskaris, Dimitrios A. Adamos, Stefanos Zafeiriou
The second task required to transfer models trained on the subjects of one or more source motor imagery datasets to perform inference on two target datasets, providing a small set of personalized calibration data for multiple test subjects.
no code implementations • CVPR 2022 • Markos Georgopoulos, James Oldfield, Grigorios G Chrysos, Yannis Panagakis
The results highlight the ability of our approach to condition image generation on attributes like gender, pose and hair style on faces, as well as a variety of features on different object classes.
1 code implementation • NeurIPS 2021 • Grigorios Chrysos, Markos Georgopoulos, Yannis Panagakis
We exhibit how CoPE can be trivially augmented to accept an arbitrary number of input variables.
no code implementations • 23 Nov 2021 • James Oldfield, Markos Georgopoulos, Yannis Panagakis, Mihalis A. Nicolaou, Ioannis Patras
This paper addresses the problem of finding interpretable directions in the latent space of pre-trained Generative Adversarial Networks (GANs) to facilitate controllable image synthesis.
no code implementations • 26 Oct 2021 • Adrian Bulat, Jean Kossaifi, Sourav Bhattacharya, Yannis Panagakis, Timothy Hospedales, Georgios Tzimiropoulos, Nicholas D Lane, Maja Pantic
We propose defensive tensorization, an adversarial defence technique that leverages a latent high-order factorization of the network.
no code implementations • 19 Oct 2021 • Siegfried Ludwig, Stylianos Bakas, Dimitrios A. Adamos, Nikolaos Laskaris, Yannis Panagakis, Stefanos Zafeiriou
Patterns of brain activity are associated with different brain processes and can be used to identify different brain states and make behavioral predictions.
no code implementations • 7 Jul 2021 • Yannis Panagakis, Jean Kossaifi, Grigorios G. Chrysos, James Oldfield, Mihalis A. Nicolaou, Anima Anandkumar, Stefanos Zafeiriou
Tensors, or multidimensional arrays, are data structures that can naturally represent visual data of multiple dimensions.
2 code implementations • 16 Apr 2021 • Grigorios G Chrysos, Markos Georgopoulos, Jiankang Deng, Jean Kossaifi, Yannis Panagakis, Anima Anandkumar
The efficacy of the proposed models is evaluated on standard image and audio classification benchmarks.
Ranked #2 on
Audio Classification
on Speech Commands
1 code implementation • 11 Apr 2021 • Grigorios G Chrysos, Markos Georgopoulos, Yannis Panagakis
We exhibit how CoPE can be trivially augmented to accept an arbitrary number of input variables.
no code implementations • 1 Jan 2021 • Grigorios Chrysos, Yannis Panagakis
The conditional variable can be discrete (e. g., a class label) or continuous (e. g., an input image) resulting into class-conditional (image) generation and image-to-image translation models, respectively.
no code implementations • ICML 2020 • Markos Georgopoulos, Grigorios Chrysos, Maja Pantic, Yannis Panagakis
Deep generative models rely on their inductive bias to facilitate generalization, especially for problems with high dimensional data, like images.
2 code implementations • 20 Jun 2020 • Grigorios Chrysos, Stylianos Moschoglou, Giorgos Bouritsas, Jiankang Deng, Yannis Panagakis, Stefanos Zafeiriou
We introduce three tensor decompositions that significantly reduce the number of parameters and show how they can be efficiently implemented by hierarchical neural networks.
Ranked #1 on
Face Recognition
on CALFW
no code implementations • 6 Jun 2020 • Markos Georgopoulos, James Oldfield, Mihalis A. Nicolaou, Yannis Panagakis, Maja Pantic
By evaluating on several age-annotated datasets in both single- and cross-database experiments, we show that the proposed method outperforms state-of-the-art algorithms for age transfer, especially in the case of age groups that lie in the tails of the label distribution.
no code implementations • 15 May 2020 • Markos Georgopoulos, Yannis Panagakis, Maja Pantic
In this work, we investigate the demographic bias of deep learning models in face recognition, age estimation, gender recognition and kinship verification.
2 code implementations • 8 Mar 2020 • Grigorios G. Chrysos, Stylianos Moschoglou, Giorgos Bouritsas, Yannis Panagakis, Jiankang Deng, Stefanos Zafeiriou
Deep Convolutional Neural Networks (DCNNs) is currently the method of choice both for generative, as well as for discriminative learning in computer vision and machine learning.
Ranked #1 on
Graph Representation Learning
on COMA
no code implementations • 12 Dec 2019 • Triantafyllos Kefalas, Konstantinos Vougioukas, Yannis Panagakis, Stavros Petridis, Jean Kossaifi, Maja Pantic
Speech-driven facial animation involves using a speech signal to generate realistic videos of talking faces.
no code implementations • 25 Sep 2019 • Adrian Bulat, Jean Kossaifi, Sourav Bhattacharya, Yannis Panagakis, Georgios Tzimiropoulos, Nicholas D. Lane, Maja Pantic
As deep neural networks become widely adopted for solving most problems in computer vision and audio-understanding, there are rising concerns about their potential vulnerability.
no code implementations • 19 Aug 2019 • Grigorios Chrysos, Stylianos Moschoglou, Yannis Panagakis, Stefanos Zafeiriou
Generative Adversarial Networks (GANs) have become the gold standard when it comes to learning generative models for high-dimensional distributions.
no code implementations • CVPR 2020 • Jean Kossaifi, Antoine Toisoul, Adrian Bulat, Yannis Panagakis, Timothy Hospedales, Maja Pantic
To alleviate this, one approach is to apply low-rank tensor decompositions to convolution kernels in order to compress the network and reduce its number of parameters.
1 code implementation • 9 Apr 2019 • James Oldfield, Yannis Panagakis, Mihalis A. Nicolaou
Recently, a multitude of methods for image-to-image translation have demonstrated impressive results on problems such as multi-domain or multi-attribute transfer.
no code implementations • 27 Feb 2019 • Arinbjörn Kolbeinsson, Jean Kossaifi, Yannis Panagakis, Adrian Bulat, Anima Anandkumar, Ioanna Tzoulaki, Paul Matthews
CNNs achieve remarkable performance by leveraging deep, over-parametrized architectures, trained on large datasets.
no code implementations • 9 Jan 2019 • Jean Kossaifi, Robert Walecki, Yannis Panagakis, Jie Shen, Maximilian Schmitt, Fabien Ringeval, Jing Han, Vedhas Pandit, Antoine Toisoul, Bjorn Schuller, Kam Star, Elnar Hajiyev, Maja Pantic
Natural human-computer interaction and audio-visual human behaviour sensing systems, which would achieve robust performance in-the-wild are more needed than ever as digital devices are increasingly becoming an indispensable part of our life.
no code implementations • 13 Feb 2018 • Markos Georgopoulos, Yannis Panagakis, Maja Pantic
Computational facial models that capture properties of facial cues related to aging and kinship increasingly attract the attention of the research community, enabling the development of reliable methods for age progression, age estimation, age-invariant facial characterization, and kinship verification from visual data.
no code implementations • 20 Jan 2018 • Grigorios G. Chrysos, Yannis Panagakis, Stefanos Zafeiriou
In addition, the state-of-the-art data-driven methods demand a vast amount of data, hence a standard engineering trick employed is artificial data augmentation for instance by adding into the data cropped and (affinely) transformed images.
no code implementations • 20 Jan 2018 • Niannan Xue, Jiankang Deng, Shiyang Cheng, Yannis Panagakis, Stefanos Zafeiriou
Robust principal component analysis (RPCA) is a powerful method for learning low-rank feature representation of various visual data.
no code implementations • 18 Jan 2018 • Mehdi Bahri, Yannis Panagakis, Stefanos Zafeiriou
Dictionary learning and component analysis models are fundamental for learning compact representations that are relevant to a given task (feature extraction, dimensionality reduction, denoising, etc.).
no code implementations • 15 Dec 2017 • Stylianos Moschoglou, Evangelos Ververas, Yannis Panagakis, Mihalis Nicolaou, Stefanos Zafeiriou
In this paper, we propose a novel component analysis technique that is suitable for facial UV maps containing a considerable amount of missing information and outliers, while additionally, incorporates knowledge from various attributes (such as age and identity).
no code implementations • CVPR 2018 • Jean Kossaifi, Linh Tran, Yannis Panagakis, Maja Pantic
Deep generative models learned through adversarial training have become increasingly popular for their ability to generate naturalistic image textures.
no code implementations • 28 Nov 2017 • Mengjiao Wang, Zhixin Shu, Shiyang Cheng, Yannis Panagakis, Dimitris Samaras, Stefanos Zafeiriou
Several factors contribute to the appearance of an object in a visual scene, including pose, illumination, and deformation, among others.
no code implementations • 14 Sep 2017 • Niannan Xue, Jiankang Deng, Yannis Panagakis, Stefanos Zafeiriou
We revisit the problem of robust principal component analysis with features acting as prior side information.
no code implementations • CVPR 2017 • Christos Sagonas, Yannis Panagakis, Alina Leidinger, Stefanos Zafeiriou
Even though the CCA is a powerful tool, it has several drawbacks that render its application challenging for computer vision applications.
no code implementations • CVPR 2017 • Mengjiao Wang, Yannis Panagakis, Patrick Snape, Stefanos Zafeiriou
To extract these modes of variations from visual data, several supervised methods, such as the TensorFaces, that rely on multilinear (tensor) decomposition (e. g., Higher Order SVD) have been developed.
1 code implementation • ICCV 2017 • Mehdi Bahri, Yannis Panagakis, Stefanos Zafeiriou
In this paper, we introduce a new robust decomposition of images by combining ideas from sparse dictionary learning and PCP.
no code implementations • ICCV 2017 • Niannan Xue, Yannis Panagakis, Stefanos Zafeiriou
Robust Principal Component Analysis (RPCA) aims at recovering a low-rank subspace from grossly corrupted high-dimensional (often visual) data and is a cornerstone in many machine learning and computer vision applications.
Facial Expression Recognition
Facial Expression Recognition (FER)
+1
no code implementations • CVPR 2017 • James Booth, Epameinondas Antonakos, Stylianos Ploumpis, George Trigeorgis, Yannis Panagakis, Stefanos Zafeiriou
In this paper, we propose the first, to the best of our knowledge, "in-the-wild" 3DMM by combining a powerful statistical model of facial shape, which describes both identity and expression, with an "in-the-wild" texture model.
Ranked #3 on
3D Face Reconstruction
on Florence
(Average 3D Error metric)
no code implementations • 1 Dec 2016 • Vladimir Gligorijevic, Yannis Panagakis, Stefanos Zafeiriou
Networks have been a general tool for representing, analyzing, and modeling relational data arising in several domains.
1 code implementation • 29 Oct 2016 • Jean Kossaifi, Yannis Panagakis, Anima Anandkumar, Maja Pantic
In addition, using the deep-learning frameworks as backend allows users to easily design and train deep tensorized neural networks.
no code implementations • ICCV 2015 • Christos Sagonas, Yannis Panagakis, Stefanos Zafeiriou, Maja Pantic
The proposed method is assessed in frontal face reconstruction, face landmark localization, pose-invariant face recognition, and face verification in unconstrained conditions.
no code implementations • ICCV 2015 • Patrick Snape, Anastasios Roussos, Yannis Panagakis, Stefanos Zafeiriou
In this paper, we propose a method for the robust and efficient computation of multi-frame optical flow in an expressive sequence of facial images.
no code implementations • CVPR 2015 • Patrick Snape, Yannis Panagakis, Stefanos Zafeiriou
In this paper we propose a method to automatically recover a class specific low dimensional spherical harmonic basis from a set of in-the-wild facial images.
no code implementations • 3 Feb 2015 • Christos Sagonas, Yannis Panagakis, Stefanos Zafeiriou, Maja Pantic
The proposed method is assessed in frontal face reconstruction (pose correction), face landmark localization, and pose-invariant face recognition and verification by conducting experiments on $6$ facial images databases.
no code implementations • CVPR 2014 • Christos Sagonas, Yannis Panagakis, Stefanos Zafeiriou, Maja Pantic
Next, to correct the fittings of a generic model, image congealing (i. e., batch image aliment) is performed by employing only the learnt orthonormal subspace.
no code implementations • CVPR 2013 • Yannis Panagakis, Mihalis A. Nicolaou, Stefanos Zafeiriou, Maja Pantic
The superiority of the proposed method against the state-of-the-art time alignment methods, namely the canonical time warping and the generalized time warping, is indicated by the experimental results on both synthetic and real datasets.