CV

Basics

Name Alexandre Symeonidis-Herzig
Label PhD Researcher in Computer Vision
Email a.symeonidisherzig@gmail.com
Url https://github.com/ash-fortyfive
Summary PhD researcher in computer vision, specializing in sign language production, photorealistic avatar synthesis, and human motion generation. Experienced in developing end-to-end deep learning systems, from multi-view data capture and preprocessing to model training and evaluation. Focused on generative modeling and building people-centered AI for communication and expression.

Work

  • 2026.03 - 2026.09

    Remote, GB

    Computer Vision Researcher Intern
    Signapse
    Six-month research internship at an AI sign language translation company, working on photorealistic real-time signing avatar rendering and data capture.
    • Developed a custom implementation of an open-source 3D Morphable Model with 3D Gaussian Splatting for photorealistic real-time signing rendering, with a focus on human reconstruction
    • Designed and built a 3-camera synchronized global-shutter capture rig, shipped abroad to record new sign language datasets, capturing over 30,000 glosses to date
  • 2023.09 - Present

    Guildford, GB

    Graduate Teaching Assistant
    University of Surrey
    Part of the team delivering labs for CS and EEE courses, providing lab instruction and technical mentoring.
    • Delivered four lab series to cohorts of 50-200 students, including COM1031 (Computer Logic), EEE1035 (C Programming), and EEE2048 (Algorithms)
    • Completed GTA training to enhance teaching, feedback, and teamwork skills
  • 2022.06 - 2022.09

    Guildford, GB

    Summer Research Intern
    University of Surrey
    Research on multi-agent reinforcement learning strategies for UAV access control, with a focus on reproducibility and model efficiency.
    • Reimplemented baselines from Matlab to PyTorch for reproducible experimentation and up to 50% faster training
    • Designed and trained deep policy networks using DQN
    • Evaluated agent coordination strategies in simulated environments
  • 2021.06 - 2022.06

    London, GB

    Associate Development Engineer
    Sky Group
    Collaborated with an agile engineering team to develop computer vision tools for automated set-top box validation, integrating OCR pipelines into production workflows.
    • Built OCR pipelines for detecting on-screen text and anomalies in video streams
    • Deployed computer vision tools for regression testing in content validation workflows

Education

  • 2023.09 - 2027.09

    Guildford, GB

    PhD
    University of Surrey
    Computer Vision
    • Thesis: Translation and Production of Non-Manual Features for Sign Language
    • Supervised by Prof. Richard Bowden and Dr. Özge Mercanoğlu Sincan
    • Reviewer for IEEE FG and BMVC
    • ECCV 2026 Doctoral Consortium
  • 2019.09 - 2023.06

    Guildford, GB

    BEng (Hons)
    University of Surrey
    Electronic Engineering
    • Graduated with First Class Honours
    • Computer Vision
    • Computer Graphics
    • C++ and Object-Oriented Design
    • Computer Algorithms and Architecture

Publications

  • 2026.08.07
    M3T: Discrete Multi-Modal Motion Tokens for Sign Language Production
    [Accepted BMVC] arXiv preprint
    State-of-the-art 3D sign language production with explicit non-manual features: an autoregressive transformer over discrete FSQ-VAE motion tokens on an SMPL-X + FLAME morphable body model, evaluated on How2Sign, CSL-Daily, Phoenix14T, and NMFs-CSL.
  • 2026.06.18
    SignSparK: Efficient Multilingual Sign Language Production via Sparse Keyframe Learning
    [Accepted ECCV] arXiv preprint
    Efficient multilingual sign language production from sparse keyframes: conditional flow matching with keyframe-to-pose editing, automatic sign segmentation, and 3D Gaussian Splatting rendering, across British, American, Chinese, and German Sign Language.
  • 2025.07.10
    VisualSpeaker: Visually-Guided 3D Avatar Lip Synthesis
    ICCV Workshops
    High-fidelity 3D avatar lip synchronization via a perceptual lip-reading loss: visual speech recognition supervising differentiable 3D Gaussian Splatting renders, supporting accurate mouthings for sign language avatars.

Skills

Programming Languages & Frameworks
Python
C++
PyTorch
OpenCV
Tools
Docker
Git
LaTeX
Weights & Biases
Linux
SLURM
Unreal Engine
Specialized
Computer Vision
Sign Language Production
Generative Modeling
Flow Matching
3D Gaussian Splatting
Neural Rendering
3D Morphable Models
Reinforcement Learning

Languages

English
Fluent
Greek
Proficient
German
Proficient
Dutch
Proficient

Projects

  • 2025.05 - 2025.08
    PokerGym: Multi-Agent Poker Environment
    • Custom Texas Hold'em multi-agent reinforcement learning environment (PettingZoo, Gymnasium) with a full PPO training pipeline, reward tracking, and legal action masking
  • 2023.09 - 2024.09
    Volumetric Sign Capture System
    • Low-cost, scalable 7-camera volumetric capture rig, combining Raspberry Pi cameras with a broadcast-grade Blackmagic studio camera and custom synchronization and control software, for multi-view sign language datasets
  • 2022.09 - 2023.06
    Marker-less Motion Capture for Signing Avatar
    • Undergraduate thesis: real-time photorealistic signing avatar driven from monocular video, combining MediaPipe, a custom uplift network, and Unreal Engine Metahumans

Volunteer

  • 2023.09 - 2024.06

    Guildford, GB

    Societies Chair
    University of Surrey Students' Union
    Oversaw 150+ student-led societies for the Students' Union.
  • 2019.09 - 2025.06
    Committee Member / Founder
    University of Surrey Societies
    Founded GameDev Society; committee roles in GameSoc and EARS.

Interests

Research
Computer Vision
3D Graphics
Human Motion Synthesis
Sign Language Translation
Hobbies
Game Development
Board Games
Climbing
Weightlifting

References

Upon Request
Available upon request from supervisors and colleagues.