Nicholas Vretos

Most-cited papers

Advances in Facial Expression Recognition: A Survey of Methods, Benchmarks, Models, and Datasets
Thomas Kopalidis, V. Solachidis, Nicholas Vretos, P. Daras
2024Inf.166 citations Open access
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Non-linear Convolution Filters for CNN-Based Learning
Georgios Zoumpourlis, Alexandros Doumanoglou, Nicholas Vretos, P. Daras
2017IEEE International Conference on Computer Vision107 citations Open access
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Human Fall Detection from Acceleration Measurements Using a Recurrent Neural Network
T. Theodoridis, V. Solachidis, Nicholas Vretos, P. Daras
201863 citations Open access
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Behavior Analysis through Multimodal Sensing for Care of Parkinson’s and Alzheimer’s Patients
Federico Álvarez, Mirela C. Popa, V. Solachidis, Gustavo Hernández-Peñaloza +7 more
2018IEEE Multimedia45 citations Open access
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3D facial expression recognition using Zernike moments on depth images
Nicholas Vretos, N. Nikolaidis, I. Pitas
20112011 18th IEEE International Conference on Image Processing38 citations
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A mutual information based face clustering algorithm for movie content analysis
Nicholas Vretos, V. Solachidis, I. Pitas
2011Image and Vision Computing36 citations
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Graph-based multimodal fusion with metric learning for multimodal classification
Michalis Angelou, V. Solachidis, Nicholas Vretos, P. Daras
2019Pattern Recognition35 citations
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Transformer-Based Fire Detection in Videos
Konstantina Mardani, Nicholas Vretos, P. Daras
2023Italian National Conference on Sensors26 citations Open access
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An Improved Tobit Kalman Filter with Adaptive Censoring Limits
K. Loumponias, Nicholas Vretos, G. Tsaklidis, P. Daras
2019Circuits, systems, and signal processing26 citations Open access
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Survey on Graph Neural Networks
Georgios Gkarmpounis, Christos Vranis, Nicholas Vretos, P. Daras
2024IEEE Access24 citations Open access
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USING KALMAN FILTER AND TOBIT KALMAN FILTER IN ORDER TO IMPROVE THE MOTION RECORDED BY KINECT SENSOR II
K. Loumponias, Nicholas Vretos, P. Daras, G. Tsaklidis
201621 citations
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Comprehensive Comparison of Deep Learning Models for Lung and COVID-19 Lesion Segmentation in CT scans
Paschalis A. Bizopoulos, Nicholas Vretos, P. Daras
2020arXiv.org20 citations
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A model-based facial expression recognition algorithm using Principal Components Analysis
Nicholas Vretos, N. Nikolaidis, I. Pitas
2009International Conference on Information Photonics20 citations
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Exploiting sensing devices availability in AR/VR deployments to foster engagement
Nicholas Vretos, P. Daras, S. Asteriadis, E. Hortal +6 more
2018Virtual Reality18 citations Open access
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Three-dimensional monitoring of weightlifting for computer assisted training
Anargyros Chatzitofis, Nicholas Vretos, D. Zarpalas, P. Daras
2013Virtual Reality International Conference17 citations
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A Mutual Information based Face Clustering Algorithm for Movies
Nicholas Vretos, V. Solachidis, I. Pitas
2006IEEE International Conference on Multimedia and Expo17 citations
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Multimodal monitoring of Parkinson's and Alzheimer's patients using the ICT4LIFE platform
Federico Álvarez, Mirela C. Popa, Nicholas Vretos, A. Belmonte-Hernández +5 more
2017Advanced Video and Signal Based Surveillance15 citations Open access
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Video fingerprinting using Latent Dirichlet Allocation and facial images
Nicholas Vretos, N. Nikolaidis, I. Pitas
2012Pattern Recognition15 citations
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Exploiting IoT Technologies for Personalized Learning
E. Spyrou, Nicholas Vretos, Andrew Pomazanskyi, S. Asteriadis +1 more
2018IEEE Conference on Computational Intelligence and Games14 citations
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Adaptive game-based learning in multi-agent educational settings
D. Tsatsou, Nicholas Vretos, P. Daras
2018Journal of Computers in Education13 citations
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Multi-view adaptive graph convolutions for graph classification
Nikolas Adaloglou, Nicholas Vretos, P. Daras
2020European Conference on Computer Vision12 citations
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Zernike Pooling: Generalizing Average Pooling Using Zernike Moments
T. Theodoridis, K. Loumponias, Nicholas Vretos, P. Daras
2021IEEE Access11 citations Open access
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Adaptive Learning Based on Affect Sensing
D. Tsatsou, Andrew Pomazanskyi, E. Hortal, E. Spyrou +4 more
2018International Conference on Artificial Intelligence in Education10 citations Open access
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Temporal and color consistent disparity estimation in stereo videos
Nicholas Vretos, P. Daras
2014International Conference on Information Photonics10 citations
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Using robust dispersion estimation in support vector machines
Nicholas Vretos, A. Tefas, I. Pitas
2013Pattern Recognition10 citations
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Less Is More: Adaptive Trainable Gradient Dropout for Deep Neural Networks
Christos Avgerinos, Nicholas Vretos, P. Daras
2023Italian National Conference on Sensors8 citations Open access
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Using Tobit Kalman ﬁltering in order to improve the motion recorded by Microsoft Kinect
K. Loumponias, Nicholas Vretos, P. Daras, G. Tsaklidis
20178 citations
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Non-Parametric Clustering Using Deep Neural Networks
Christos Avgerinos, V. Solachidis, Nicholas Vretos, P. Daras
2020IEEE Access7 citations Open access
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Nadine-Bot: An Open Domain Migrant Integration Administrative Agent
Athanasios Lelis, Nicholas Vretos, P. Daras
20202020 IEEE International Conference on Multimedia & Expo Workshops (ICMEW)7 citations
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Technologies Facilitating Smart Pedagogy
P. Karkazis, H. Leligou, P. Trakadas, Nicholas Vretos +3 more
2018Didactics of Smart Pedagogy7 citations
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Adaptive Tobit Kalman-Based Tracking
K. Loumponias, A. Dimou, Nicholas Vretos, P. Daras
2018International Conference on Signal-Image Technology and Internet-Based Systems7 citations
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Face clustering in videos based on spectral clustering techniques
C. Chrysouli, Nicholas Vretos, I. Pitas
2011The First Asian Conference on Pattern Recognition7 citations
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A novel framework for physical therapy rehabilitation monitoring and assessment in Parkinson disease patients using depth information
A. Belmonte-Hernández, T. Theodoridis, M. B. González, Gustavo Hernández-Peñaloza +6 more
2019Petra6 citations
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Two examples of online eHealth platforms for supporting people living with cognitive impairments and their caregivers
V. Solachidis, I. Paliokas, Nicholas Vretos, K. Votis +2 more
2018Petra6 citations Open access
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RobusterNet: Improving Copy-Move Forgery Detection with Volterra-based Convolutions
Efthimia Kafali, Nicholas Vretos, T. Semertzidis, P. Daras
2021International Conference on Pattern Recognition5 citations
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Action recognition from videos using sparse trajectories
Alexandros Doumanoglou, Nicholas Vretos, P. Daras
2016International Conferences on Imaging for Crime Detection and Prevention5 citations
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Person tracking association using multi-modal systems
A. Belmonte-Hernández, Vassilios Solachidis, T. Theodoridis, Gustavo Hernández-Peñaloza +4 more
2017Advanced Video and Signal Based Surveillance4 citations Open access
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An MPEG-7 Based Description Scheme for Video Analysis Using Anthropocentric Video Content Descriptors
Nicholas Vretos, V. Solachidis, I. Pitas
2005Panhellenic Conference on Informatics4 citations Open access
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Experiences and Lessons Learnt from the Evaluation of ICT Tools for and with Migrants
H. Leligou, Despina Anastasopoulos, Nicholas Vretos, V. Solachidis +6 more
2021The social science3 citations Open access
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Embracing Novel ICT Technologies to Support the Journey From Camp to Job
H. Leligou, Despina Anastosopoulos, Anita Montagna, V. Solachidis +1 more
20202020 IEEE International Conference on Multimedia & Expo Workshops (ICMEW)3 citations
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Frequency-based slow feature analysis
Alexandros Doumanoglou, Nicholas Vretos, P. Daras
2019Neurocomputing3 citations
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AFFECTIVE STATE RECOGNITION BASED ON EYE GAZE ANALYSIS USING TWO–STREAM CONVOLUTIONAL NETWORKS
C. Chrysouli, Nicholas Vretos, P. Daras
2018International Workshop on Machine Learning for Signal Processing3 citations
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Modelling learning experiences in adaptive multi-agent learning environments
D. Tsatsou, Nicholas Vretos, P. Daras
2017International Conference on Games and Virtual Worlds for Serious Applications3 citations Open access
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Social Media Interaction and Analytics for Enhanced Educational Experiences
Georgios Palaiokrassas, A. Voulodimos, Kleopatra G. Konstanteli, Nicholas Vretos +4 more
2015IEEE Multimedia3 citations
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A novel dimensionality reduction technique based on kernel optimization through graph embedding
Nicholas Vretos, A. Tefas, I. Pitas
2015Signal, Image and Video Processing3 citations
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The use of Audio-Visual Description Profile in 3D video content description
Nicholas Vretos, N. Nikolaidis, I. Pitas
20122012 3DTV-Conference: The True Vision - Capture, Transmission and Display of 3D Video (3DTV-CON)3 citations
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Anthropocentric Semantic Information Extraction from Movies
Nicholas Vretos, V. Solachidis, I. Pitas
20083 citations
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Mahalanobis Distance-Based Graph Attention Networks
Konstantina Mardani, Nicholas Vretos, P. Daras
2024IEEE Access2 citations Open access
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TeNDER: towards efficient Health Systems through e-Health platforms employing multimodal monitoring
V. Solachidis, Jaime Moreno, Gustavo Hernández-Peñaloza, Nicholas Vretos +2 more
2021IEEE/ACM International Conference on Connected Health: Applications, Systems and Engineering Technologies2 citations
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Indirect skill assessment using AI technology
Maria Tountopoulou, F. Vlachaki, P. Daras, Nicholas Vretos +1 more
20212 citations Open access
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