CV
Basics
| Name | Alexandre Symeonidis-Herzig |
| Label | PhD Researcher in Computer Vision |
| a.symeonidisherzig@gmail.com | |
| Url | https://github.com/ash-fortyfive |
Work
-
2026.03 - 2026.09 Remote, GB
Computer Vision Research Engineer: 3DGS & Diffusion Avatars
Signapse
- Trained mesh-anchored Gaussian Splatting avatars that render signing in real time from any viewpoint
- Worked on a video diffusion pipeline that refines 3DGS renders into photorealistic avatar video
- Fitted a merged SOMA body and FLAME head model to multi-view captures of a full signer dataset
- Designed a portable multi-view capture rig that recorded 10,000 signs on site in 4 months
-
2023.09 - present Guildford, GB
PhD Researcher
University of Surrey, CVSSP
- Leading multi-view capture and large-scale 3DMM fitting for the lab's sign language datasets
- Multi-node training on NVIDIA and AMD clusters; wrote two funded Isambard-AI proposals (20,000 GPU-hours)
- Contributing to SLTK, the lab's open-source sign language toolkit
Education
-
2023.09 - 2028 Guildford, GB
PhD
University of Surrey
Computer Vision
- Expected graduation: early 2028
- Thesis (working title): Preserving Face, Body, and Hand Information in Sign Language Production
- Supervised by Prof. Richard Bowden and Dr. Özge Mercanoğlu Sincan
-
2019.09 - 2023.06 Guildford, GB
BEng (Hons), First Class
University of Surrey
Electronic Engineering
- Thesis: real-time photorealistic avatar driven from monocular video (MediaPipe, MetaHumans)
Publications
-
2026.11 M3T: Discrete Multi-Modal Motion Tokens for Sign Language Production
BMVC
Separate discrete tokens for body, hands, and face (SMPL-X + FLAME), generated from text by a transformer; state-of-the-art 3D sign motion that keeps the facial expressions earlier methods lose.
-
2026.09 SignSparK: Efficient Multilingual Sign Language Production via Sparse Keyframe Learning
ECCV
Generates full 3D signing from sparse keyframes with flow matching, across four sign languages, rendered with photorealistic Gaussian Splatting avatars.
-
2025.10 VisualSpeaker: Visually-Guided 3D Avatar Lip Synthesis
ICCV Workshops, Oral
Trains photorealistic 3D avatar lip motion through differentiable Gaussian Splatting renders and a lip-reading perceptual loss, giving clearer, more readable mouth shapes.
Skills
| 3D Vision | |
| Gaussian Splatting | |
| differentiable rendering | |
| 3DMM fitting (SOMA / SMPL-X / FLAME) |
| Generative | |
| Video diffusion | |
| flow matching | |
| FSQ and VQ-VAE tokenisation | |
| autoregressive transformers | |
| LLM fine-tuning |
| Engineering | |
| Python | |
| C++ | |
| PyTorch (multi-node DDP) | |
| CUDA and ROCm | |
| Diffusers | |
| vLLM | |
| SLURM | |
| Apptainer | |
| Docker | |
| W&B |
Languages
| English | |
| Fluent |
| German | |
| Proficient |
| Greek | |
| Proficient |
| Dutch | |
| Proficient |
| BSL | |
| Level 1 |
Interests
| Research | |
| Computer Vision | |
| 3D Graphics | |
| Human Motion Synthesis | |
| Sign Language Translation |
| Hobbies | |
| Game Development | |
| Board Games | |
| Climbing | |
| Weightlifting |