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Dr. Nicholas Vretos -
Publications

Journals

  1. K. Mardani, N. Vretos, P. Daras, "Mahalanobis Distance-Based Graph Attention Networks.", In IEEE Access, vol. 12, pp. 166923-166935, 2024. DOI: 10.1109/ACCESS.2024.3495531
  2. G. Gkarmpounis, C. Vranis, N. Vretos, P. Daras, "Survey on Graph Neural Networks.", In IEEE Access, vol. 12, pp. 128816-128832, 2024. DOI: 10.1109/ACCESS.2024.3456913
  3. T. Kopalidis, V. Solachidis, N. Vretos, P. Daras, "Advances in Facial Expression Recognition: A Survey of Methods, Benchmarks, Models, and Datasets.", Information, vol. 15, no. 3, 2024. https://doi.org/10.3390/info15030135
  4. T. Kopalidis, V. Solachidis, N. Vretos, P. Daras, "Advances in Facial Expression Recognition: A Survey ofMethods, Benchmarks, Models, and Datasets.",Information, vol. 15, 2024.
  5. K. Mardani, N. Vretos, P. Daras, "Transformer-Based Fire Detection in Videos.", Sensors, vol. 23, no. 6, 2023. https://doi.org/10.3390/s23063035
  6. C. Avgerinos, N. Vretos, P. Daras, "Less Is More: Adaptive Trainable Gradient Dropout for Deep Neural Networks.", Sensors vol. 23, no. 3, 2023.
  7. H. Leligou, D. Anastasopoulos, N. Vretos, V. Solachidis, E. Kantor, I. Plasilova, E. Girardet, A. Montagna, F. Vlahaki, M. Tountopoulou, "Experiences and Lessons Learnt from the Evaluation of ICT Tools for and with Migrants.",Social Sciences, vol. 10, no. 9, 2021. https://doi.org/10.3390/socsci10090344
  8. M. Tountopoulou, N. Drosos, M. Triantafillopoulou, F. Vlachaki, P. Daras, N. Vretos, A. Lelis, "Training of Prosocial Skills to Migrant Groups Through Serious Games.",Advances in Social Sciences Research Journal, vol. 8, no. 8, pp. 464-483, 2021. https://doi.org/10.14738/assrj.88.10673
  9. T. Theodoridis, K. Loumponias, N. Vretos, P. Daras, "Zernike Pooling: Generalizing Average Pooling Using Zernike Moments.",IEEE Access, vol. 9, pp. 121128-121136, 2021, doi: 10.1109/ACCESS.2021.3108630
  10. M. Tountopoulou, F. Vlachaki, P. Daras, N. Vretos, A. Christoforidis, "Indirect Skill Assessment Using AI Technology.",Advances in Social Sciences Research Journal, vol. 8, no. 4, pp. 723-737, 2021. https://doi.org/10.14738/assrj.84.10077
  11. H. Leligou, D. Anastasopoulos, A. Montagna, V. Solachidis, N. Vretos, "Combining ICT Technologies to Serve Societal Challenges.", Advances in Science, Technology and Engineering Systems Journal, vol. 6, no. 1, pp. 1319-1327, 2021.
  12. C. Avgerinos, V. Solachidis, N. Vretos, P. Daras, "Non-Parametric Clustering Using Deep Neural Networks.",IEEE Access, vol. 8, pp. 153630-153640, 2020. https://doi.org/10.1109/ACCESS.2020.3017884
  13. K. Loumponias, N. Vretos, G. Tsaklidis, P. Daras, "An Improved Tobit Kalman Filter with Adaptive Censoring Limits.", Circuits, Systems, and Signal Processing, vol. 39, pp. 5588–5617, 2020, accepted for publication.
  14. M. Angelou, V. Solachidis, N. Vretos, P. Daras, "Graph-based Multimodal Fusion with metric learning for multimodal classification",Pattern Recognition, Elsevier, Volume 95, Pages 296-307, , November 2019 https://doi.org/10.1016/j.patcog.2019.06.013
  15. A. Doumanoglou, N. Vretos, P. Daras, "Frequency - Based Slow Feature Analysis",Neurocomputing, Vol: 368, Nov 2019, Pages: 34-50. DOI: https://doi.org/10.1016/j.neucom.2019.08.067
  16. D. Tsatsou, N. Vretos, P. Daras, "Adaptive game-based learning in multi-agent educational settings",Special Issue on Education and Learning for Virtual Environments and Serious Games, Journal of Computers in Education, Springer, Volume 6, Issue 2, pp 215–239, June 2019
  17. N. Vretos, P. Daras, S. Asteriadis, E. Hortal, E. Ghaleb, E. Spyrou, H. C. Leligou, P. Karkazis, P. Trakadas, K. Assimakopoulos, "Exploiting sensing devices availability in AR/VR deployments to foster engagement",Springer Virtual Reality (2018) https://doi.org/10.1007/s10055-018-0357-0
  18. F. Alvarez, M. Popa, V. Solachidis, G. Hernandez, A. Belmonte-Hernandez, S. Asteriadis, N. Vretos, M. Quintana, D. Dotti, T. Theodoridis, P. Daras, "Behavior Analysis through Multimodal Sensing for Care of Parkinson's and Alzheimer's Patients",in IEEE MultiMedia, vol. 25, no. 1, pp. 14-25, Jan.-Mar. 2018.
  19. A. Sanchez-Rico, P. Garel, I. Notarangelo, M. Quintana, G. Hernandez, S. Asteriadis, M. Popa, N. Vretos, V. Solachidis, M. Burgos, A. Girault, "ICT Services for Life Improvement for the Elderly", Studies in health technology and informatics, 242, p.600, 2017
  20. G. Palaiokrassas, A. Voulodimos, K. Konstanteli, N. Vretos, D. S. Osborne, E. Chatzi, P. Daras, T. Varvarigou, "Social media interaction and analytics for enhanced educational experiences",IEEE Multimedia Magazine, 23(1), 26-35, Jan.-Mar. 2016

Conference

  1. J. Jiménez, J. Mercado, L. Carrasco, V. Ruíz, V. Solachidis, J. Serrano, N. Vretos, F. Álvarez, "Monitoring of motor function in the rehabilitation room.", in Proceedings of the 15th International Conference on PErvasive Technologies Related to Assistive Environments, June 29, 2022, pp. 683-688.
  2. R. Medina-García, C.M. Lozano-Hernández, J. Mercado Gómez, J. Jiménez Ramos, S. Glišović Krivec, M. Steinböck, A. Chiaravalloti, P. Karkazis, V. Solachidis, N. Vretos, J. Serrano, "Virtual assistants and intelligent care environments for long-term patients: A Home set scenario.", in Proceedings of the 15th International Conference on PErvasive Technologies Related to Assistive Environments, June 29, 2022, pp. 689-693.
  3. T. Theodoridis, G. Katsikas, N. Vretos, P. Daras, "A Symbiotic Orchestration Module for Multi-agent Collaboration in Disaster Response Scenarios.", in Proceedings of the 19th ISCRAM, 2022, pp. 771-780. https://dblp.org/db/conf/iscram/iscram2022.html#conf/iscram/TheodoridisKVD22
  4. V. Solachidis, J. Moreno, G. Hernandez-Penaloza, N. Vretos, F. Alvarez, P. Daras, "TeNDER: Towards Efficient Health Systems through e-Health Platforms Employing Multimodal Monitoring.", in Proceedings of the IEEE/ACM CHASE Workshop on Artificial Intelligence and Internet of Things for Digital Health, Washington D.C., USA, December 16-17, 2021.
  5. E. Kafali, N. Vretos, T. Semertzidis, P. Daras, "RobusterNet: Improving Copy-Move Forgery Detection with Volterra-based Convolutions.",in Proceedings of the International Conference on Pattern Recognition, Milan, Italy, January 10-15, 2021. https://doi.org/10.1109/ICPR48806.2021.9412587
  6. D. Krivec, G. Hernández-Peñaloza, Š. Glišović-Krivec, D. Fabjan, P. Gangas, C. Lozano-Hernández, N. Vretos, P. Daras, B. Schäpers, S. Hinterholzer, M. Steinböck, F. Müller, K. Jahn, F. Álvarez-García, J. Jimenez-Ramos, L. Carrasco-Marin, A. Cimini, M. Ricci, "TeNDER – Co-creation of the intelligent support system with patients, carers and professionals", in Alzheimer Europe Conference, October 20-22, 2020.
  7. N. Adaloglou, N. Vretos, P. Daras, "Multi-view Adaptive Graph Convolutions for Graph Classification", in European Conference on Computer Vision (ECCV), Glasgow, Scotland, August 23-28, 2020.
  8. H. Leligou, D. Anastosopoulos, A. Montagna, V. Solachidis, N. Vretos, "Embracing Novel ICT Technologies To Support The Journey From Camp To Job", In IEEE ICME Workshop on ICT and Multimedia Tools for Migrants Inclusion in Host societies (WIMMIH2020), London, England, July 7-11, 2020.
  9. A. Lelis, N. Vretos, P. Daras, "Nadine-Bot: An Open Domain Migrant Integration Administrative Agent", In IEEE ICME Workshop on ICT and Multimedia Tools for Migrants Inclusion in Host societies (WIMMIH2020), London, England, July 7-11, 2020.
  10. Y. You, M. Lecca, M. Gottardi, G. Urlini, N. Vretos, L. Gymnopoulos, P. Daras, "A Battery Powered Vision Sensor for Forensic Evidence Gathering",13th International Conference on Distributed Smart Cameras, Trento, Italy, 9-11 September 2019.
  11. G. Palaiopanos, P. Stalidis, T. Semertzidis, N. Vretos, P. Daras, "Embedding Big Data in Graph Convolutional Networks",25th International Conference on Engineering, Technology and Innovation (ICE/IEEE ITMC 2019), Sophia Antipolis Innovation Park, France, 17-19 June 2019.
  12. A. Belmonte-Hernandez, T. Theodoridis, M. Burgos Gonzalez, G. Hernandez-Penaloza, V. Solachidis, J. Jimenez Ramos, F. Alvarez, N. Vretos, L. Carrasco, P. Daras, "A novel Framework for Physical Therapy Rehabilitation Monitoring and Assessment in Parkinson Disease Patients using Depth information",12th International Conference on PErvasive Technologies Related to Assistive Environments Conference (PETRA 2019), June 5-7, 2019, Rhodes, Greece
  13. K. Loumponias, A. Dimou, N. Vretos, P. Daras, "Adaptive Tobit Kalman-based tracking",14th International Conference on Signal Image Technology & Internet Based Systems (SITIS 2018), Universidad De Las Palmas De Grand Canaria, Spain, 26-29 November 2018.
  14. I. Tsingalis, N. Vretos, P. Daras, "Leveraging Skeleton Structure and Time Dependencies in the Scope of Action Recognition",IEEE International Conference on Image Processing, ICIP 2018, Oct 7-10, Athens, Greece
  15. C. Chrysouli, N. Vretos, P. Daras, "Affective State Recognition based on Eye Gaze Analysis using Two-Stream Convolutional Networks",IEEE International Workshop on Machine Learning for Signal Processing, MLSP 2018, Sept 17-20, Aalborg, Denmark
  16. E. Spyrou, N. Vretos, A. Pomazanskyi, S. Asteriadis, H. Leligou, "Exploiting IoT Technologies for Personalized Learning",Computational Intelligence and Games (CIG), Maastricht, The Netherlands, August 14-17, 2018
  17. D. Tsatsou, A. Pomazanskyi, E. Hortal, E. Spyrou, H. Leligou, S. Asteriadis, N. Vretos, P. Daras, "Adaptive learning based on affect sensing",International Conference on Artificial Intelligence in Education. London, UK, June 27-30, 2018.
  18. V. Solachidis, I. Paliokas, N. Vretos, K. Votis, U. Cortιs, D. Tzovaras, "Two examples of online eHealth platforms for supporting people living with cognitive impairments and their caregivers",in PErvasive Technologies Related to Assistive Environments (PETRA), Corfu, Greece, 26-29 Jun. 2018, pp. 449-454. doi: 10.1145/3197768.3201556
  19. T. Theodoridis, V. Solachidis, N. Vretos, P. Daras, "Human fall detection from acceleration measurements using a Recurrent Neural Network",International Conference on Biomedical and Health Informatics Thessaloniki, Greece, 18-21 November 2017
  20. G. Zoumpourlis, A. Doumanoglou, N. Vretos, P. Daras, "Non-linear Convolution Filters for CNN-based Learning",IEEE International Conference on Computer Vision (ICCV 2017), Venice, Italy, October 22-29 2017
  21. D. Tsatsou, N. Vretos, P. Daras, "Modelling Learning Experiences in adaptive multi-agent learning environments",Proceedings of the 9th International Conference on Virtual Worlds and Games for Serious Applications (VS-Games 2017), Athens, Greece, September 2017.
  22. F. Alvarez, M. Popa, N. Vretos, A. Belmonte, S. Asteriadis, V. Solachidis, T. Mariscal, D. Dotti, P. Daras, "Multimodal monitoring of Parkinson's and Alzheimer's patients using the ICT4LIFE platform",14th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), Lecce, Italy, 29 Aug – 1 Sept, 2017
  23. A. Belmonte-Hernandez, V. Solachidis, T. Theodoridis, G. Hernandez, G. Conti, N. Vretos, P. Daras, F. Alvarez, "Person Tracking Association Using Multi-modal Systems",14th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), Lecce, Italy, 29 Aug – 1 Sept, 2017
  24. T. Theodoridis, D. Dotti, M. Popa, V. Solachidis, N. Vretos, P. Daras, G. Hernandez, F. Alvarez, A. Gonzales Paton, A. Lopez, "ICT4Life Open Source Libraries supporting Multimodal Analysis of different diseases",14th IEEE International Conference on Advanced Video and Signal Based Surveillance (AVSS), Lecce, Italy, 29 Aug – 1 Sept, 2017
  25. D. Antonaras, C. Pavlidis, N. Vretos, P. Daras, "Affect State Recognition for Adaptive Human Robot Interaction in Learning Environments",2017 12th International Workshop on Semantic and Social Media Adaptation and Personalization (SMAP), Bratislava, Slovakia, July 9 -10, 2017
  26. A. Doumanoglou, N. Vretos, P. Daras, "Action Recognition From Videos using Sparse Trajectories",,7th International Conference on Imaging for Crime Detection and Prevention (ICDP-16), Madrid, 23-25 November, 2016
  27. N. Vretos, D. Alexiadis, D. Zarpalas, P. Daras, "Enhancing Real Time 3D reconstruction with pre scanned meshes",IEEE International Conference on Image Processing, ICIP 2016, Sept 25-28, Phoenix, Arizona, USA
  28. K. Loumponias, N. Vretos, P. Daras, G. Tsaklidis, "Using Tobit Kalman filtering in order to improve the Motion recorded by Microsoft Kinect",, International workshop on applied probability IWAP 2016, 20-23 June, 2016, Toronto, Canada
  29. K. Loumponias, N. Vretos, P. Daras, G. Tsaklidis, "Using Kalman filter and tobit kalman filter in order to improve the Motion recorded by Kinect sensor II",29th Hellenic national statistics conference, 4-7 May 2016, Imathia, Greece.
  30. N. Vretos, P. Daras, "Temporal And Color Consistent Disparity Estimation In Stereo Videos",IEEE International Conference on Image Processing, ICIP 2014, Oct 27-30, Paris, France
  31. D. Christopoulos, E. Hatzi, A. Chatzitofis, N. Vretos, P. Daras, "Future Media Internet Technologies for Digital Domes",16th International Conference on Human-Computer Interaction (HCI International 2014), 22 - 27 June 2014, Creta Maris, Heraklion, Crete, Greece
  32. A. Chatzitofis, N. Vretos, D. Zarpalas, P. Daras, "Three-dimensional Monitoring of Weightlifting for Computer Assisted Training",15th International Conference on Virtual Reality and Converging Technologies, Laval, France, 2013
  33. N. Vretos, N. Nikolaidis, I. Pitas, "A Model Based Facial Expression Recognition Algorithm using Principal Components Analysis", IEEE International Conference on Image Processing 2009 (ICIP 09), Cairo, Egypt, 7-11 November 2009.

Books Chapters

  1. I. Maniadis, V. Solachidis, N. Vretos, P. Daras, "Data Augmentation Using GANs for 3D Applications.",in Recent Advances in 3D Imaging, Modeling, and Reconstruction, A. Voulodimos and A. Doulamis, Eds. IGI Global, 2020.
  2. P. Karkazis, H. C. Leligou, P. Trakadas, N. Vretos, S. Asteriadis, P. Daras, P. Standen, "Technologies facilitating smart pedagogy",Didactics of Smart Pedagogy-Smart Pedagogy for Technology Enhanced Learning, ISBN 978-3-030-01550-3 Linda Daniela, Springer, 2018.