Panagiotis P. Filntisis

I am a Postdoctoral Researcher at the Athena Research Center and the National Technical University of Athens, supervised by Prof. Petros Maragos, and a Guest Researcher at the Max Planck Institute for Intelligent Systems. My research centers on the perception of expressive human behavior — 3D face and body modeling, affective computing, and multimodal learning — with a growing line of work on robot perception, active perception, and open-ended learning.

Some recent projects:

MOCHI — registration-free multi-view 3D face capture
SMIRK — 3D facial expression reconstruction
SPECTRE — visual speech-informed facial reconstruction
Neural Emotion Director — semantic control of facial expressions
VISOR — open-ended robotic exploration

news

May 5, 2026	MOCHI has been accepted to CVPR 2026, and the project page is now live!
Oct 31, 2025	Only-Style has received the ICCV 2025 P13N Workshop Best Paper Award.
Jun 15, 2025	Happy to share that our paper “A Transformer-Based Framework for Greek Sign Language Production using Extended Skeletal Motion Representations” received the PETRA 2025 Best Student Paper Award !
Sep 30, 2024	I gave an invited talk at Max Planck Institute for Intelligent Systems (Tubingen, Germany) on Advancements in 3D Facial Expression Reconstruction.
Jun 15, 2023	My PhD thesis “Multimodal Deep Learning for Emotion Recognition and Expression Synthesis with Applications in Human-Robot Interaction” has been honored with the “Iakovos Giourounlian” Award as among the best PhD theses with Industrial Interest.

selected publications

MOCHI: Registration-Free Learnable Multi-View Capture of Faces in Dense Semantic Correspondence

Panagiotis P. Filntisis, George Retsinas, Radek Danecek, Vanessa Sklyarova, Petros Maragos, and Timo Bolkart

CVPR 2026

PDF Website

@inproceedings{filntisis2026mochi,
  title = {MOCHI: Registration-Free Learnable Multi-View Capture of Faces in Dense Semantic Correspondence},
  author = {Filntisis, Panagiotis P. and Retsinas, George and Danecek, Radek and Sklyarova, Vanessa and Maragos, Petros and Bolkart, Timo},
  booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
  year = {2026},
}

VGGT-HPE: Reframing Head Pose Estimation as Relative Pose Prediction

Vasiliki Vasileiou, Panagiotis P. Filntisis, Petros Maragos, and Kostas Daniilidis

CVPR-W 2026

PDF Website

@inproceedings{vasileiou2026vggthpe,
  title = {VGGT-HPE: Reframing Head Pose Estimation as Relative Pose Prediction},
  author = {Vasileiou, Vasiliki and Filntisis, Panagiotis P. and Maragos, Petros and Daniilidis, Kostas},
  booktitle = {CVPR-W (ABAW Workshop)},
  year = {2026},
  url = {https://vasilikivas.github.io/VGGT-HPE/},
}

Towards Open-ended Robotic Exploration using Vision-Inspired Similarity and Foundation Models

Panagiotis P. Filntisis, Efthymios Tsaprazlis, Paraskevas Oikonomou, Francesco Mattioli, Vieri Giuliano Santucci, George Retsinas, and Petros Maragos

ICRA 2025

PDF

@inproceedings{filntisis2025visor,
  title = {Towards Open-ended Robotic Exploration using Vision-Inspired Similarity and Foundation Models},
  author = {Filntisis, Panagiotis P. and Tsaprazlis, Efthymios and Oikonomou, Paraskevas and Mattioli, Francesco and Santucci, Vieri Giuliano and Retsinas, George and Maragos, Petros},
  booktitle = {IEEE International Conference on Robotics and Automation (ICRA)},
  year = {2025},
}

Category-Level 6D Object Pose Estimation in Agricultural Settings Using a Lattice-Deformation Framework and Diffusion-Augmented Synthetic Data

Marios Glytsos, Panagiotis P. Filntisis, George Retsinas, and Petros Maragos

IROS 2025

PDF

@inproceedings{glytsos2025plantpose,
  title = {Category-Level 6D Object Pose Estimation in Agricultural Settings Using a Lattice-Deformation Framework and Diffusion-Augmented Synthetic Data},
  author = {Glytsos, Marios and Filntisis, Panagiotis P. and Retsinas, George and Maragos, Petros},
  booktitle = {IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS)},
  year = {2025},
  url = {https://openreview.net/forum?id=TGBfFwWTsD},
  note = {PLANTPose},
}

SMIRK: 3D Facial Expressions through Analysis-by-Neural-Synthesis

George Retsinas, Panagiotis P. Filntisis, Radek Danecek, Victoria F. Abrevaya, Anastasios Roussos, Timo Bolkart, and Petros Maragos

CVPR 2024

PDF Website

@inproceedings{retsinas2024smirk,
  title = {SMIRK: 3D Facial Expressions through Analysis-by-Neural-Synthesis},
  author = {Retsinas, George and Filntisis, Panagiotis P. and Danecek, Radek and Abrevaya, Victoria F. and Roussos, Anastasios and Bolkart, Timo and Maragos, Petros},
  booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR)},
  year = {2024},
}

Visual Speech-Aware Perceptual 3D Facial Expression Reconstruction from Videos

Panagiotis P. Filntisis, George Retsinas, Foivos Paraperas-Papantoniou, Athanasios Katsamanis, Anastasios Roussos, and Petros Maragos

CVPR-W 2023

PDF Code Website

@inproceedings{filntisis2022visual,
  title = {Visual Speech-Aware Perceptual 3D Facial Expression Reconstruction from Videos},
  author = {Filntisis, Panagiotis P. and Retsinas, George and Paraperas-Papantoniou, Foivos and Katsamanis, Athanasios and Roussos, Anastasios and Maragos, Petros},
  booktitle = {CVPR-W},
  year = {2023},
}

Neural Emotion Director: Speech-preserving semantic control of facial expressions in "in-the-wild" videos

Foivos Paraperas Papantoniou, Panagiotis P. Filntisis, Petros Maragos, and Anastasios Roussos

CVPR 2022

PDF Code Website

@inproceedings{paraperas2022ned,
  title = {Neural Emotion Director: Speech-preserving semantic control of facial expressions in "in-the-wild" videos},
  author = {Paraperas Papantoniou, Foivos and Filntisis, Panagiotis P. and Maragos, Petros and Roussos, Anastasios},
  booktitle = {Proceedings of the IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR) (Oral - Best Paper Finalist)},
  year = {2022},
}

An Audiovisual Child Emotion Recognition System for Child-Robot Interaction Applications

Panagiotis P. Filntisis, Niki Efthymiou, Gerasimos Potamianos, and Petros Maragos

EUSIPCO 2021

PDF Code

@inproceedings{filntisis2021audiovisual,
  title = {An Audiovisual Child Emotion Recognition System for Child-Robot Interaction Applications},
  author = {Filntisis, Panagiotis P. and Efthymiou, Niki and Potamianos, Gerasimos and Maragos, Petros},
  booktitle = {European Signal Processing Conference (EUSIPCO)},
  pages = {791--795},
  year = {2021},
  organization = {IEEE},
}

Emotion understanding in videos through body, context, and visual-semantic embedding loss

Panagiotis P. Filntisis, Niki Efthymiou, Gerasimos Potamianos, and Petros Maragos

ECCV-W 2020

PDF Code

@inproceedings{filntisis2020emotion,
  title = {Emotion understanding in videos through body, context, and visual-semantic embedding loss},
  author = {Filntisis, Panagiotis P. and Efthymiou, Niki and Potamianos, Gerasimos and Maragos, Petros},
  booktitle = {European Conference on Computer Vision Workshops (ECCVW)},
  pages = {747--755},
  year = {2020},
  organization = {Springer, Cham},
  note = {Challenge Winner!}
}

Fusing body posture with facial expressions for joint recognition of affect in child–robot interaction

Panagiotis P. Filntisis, Niki Efthymiou, Petros Koutras, Gerasimos Potamianos, and Petros Maragos

IEEE Robotics and Automation Letters 2019

PDF Code

@article{filntisis2019fusing,
  title = {Fusing body posture with facial expressions for joint recognition of affect in child--robot interaction},
  author = {Filntisis, Panagiotis P. and Efthymiou, Niki and Koutras, Petros and Potamianos, Gerasimos and Maragos, Petros},
  journal = {IEEE Robotics and Automation Letters},
  volume = {4},
  number = {4},
  pages = {4011--4018},
  year = {2019},
  publisher = {IEEE},
}

Video-realistic expressive audio-visual speech synthesis for the Greek language

Panagiotis P. Filntisis, Athanasios Katsamanis, Pirros Tsiakoulis, and Petros Maragos

Speech Communication 2017

PDF Code

@article{filntisis2017video,
  title = {Video-realistic expressive audio-visual speech synthesis for the Greek language},
  author = {Filntisis, Panagiotis P. and Katsamanis, Athanasios and Tsiakoulis, Pirros and Maragos, Petros},
  journal = {Speech Communication},
  volume = {95},
  pages = {137--152},
  year = {2017},
  publisher = {North-Holland},
}