Vitor Pereira Matias

PhD researcher at ICMC-USP, advised by Afonso Paiva and Tiago Novello.

I am a Computer Science PhD researcher at the University of São Paulo (USP), advised by Afonso Paiva (ICMC-USP) and Tiago Novello (IMPA). I specialize in 3D/4D reconstruction from images, computer vision, and geometric modeling. My current work focuses on 3D Gaussian Splatting (3DGS) and geometrically consistent surface extraction.

I hold a Bachelor’s degree in Pure Mathematics from the State University of Londrina (UEL). While there, I managed over 40 distinct projects within the Mathematics Tutorial Education Program (PET) and spent over two years as a data science researcher to optimize Covid-19 spread predictions. This background heavily inspires my approach to computer vision, a transition I solidified during my Master’s degree focusing on human skin tone classification, as well as through industry experience as a Computer Vision Engineer at Wikki/Wiise Brazil applying state-of-the-art models to microfossil segmentation.

Selected Publications
Other Publications

NeurIPS

FLOWING: Implicit Neural Flows for Structure-Preserving Morphing

Arthur Bizzi, Matias Grynberg Portnoy, Vitor Pereira Matias, and 7 more authors

In Advances in Neural Information Processing Systems, 2025

arXiv Bib HTML PDF Code

@inproceedings{bizzi2025flowing,
  title = {{FLOWING}: Implicit Neural Flows for Structure-Preserving Morphing},
  author = {Bizzi, Arthur and Grynberg Portnoy, Matias and Pereira Matias, Vitor and Perazzo, Daniel and Silva do Monte Lima, Jo{\~a}o Paulo and Velho, Luiz and Gon{\c{c}}alves, Nuno and Pereira, Jo{\~a}o and Schardong, Guilherme and Novello, Tiago},
  booktitle = {Advances in Neural Information Processing Systems},
  volume = {38},
  pages = {153041--153065},
  year = {2025},
}

SIBGRAPI

From Volume Rendering to 3D Gaussian Splatting: Theory and Applications

Vitor Pereira Matias, Daniel Perazzo, Vinicius Silva, and 4 more authors

In 38th SIBGRAPI Conference on Graphics, Patterns and Images, 2025

DOI arXiv Bib PDF

@inproceedings{matias2025volume,
  title = {From Volume Rendering to {3D} Gaussian Splatting: Theory and Applications},
  author = {Matias, Vitor Pereira and Perazzo, Daniel and Silva, Vinicius and Raposo, Alberto and Velho, Luiz and Paiva, Afonso and Novello, Tiago},
  booktitle = {38th SIBGRAPI Conference on Graphics, Patterns and Images},
  year = {2025},
  pages = {1--6},
  doi = {10.1109/SIBGRAPI67909.2025.11223276},
}

arXiv

Large-Scale Dataset and Benchmark for Skin Tone Classification in the Wild

Vitor Pereira Matias, Márcus Vinícius Lobo Costa, João Batista Neto, and 1 more author

arXiv preprint arXiv:2603.02475, 2026

arXiv Bib PDF

@article{matias2026largescale,
  title = {Large-Scale Dataset and Benchmark for Skin Tone Classification in the Wild},
  author = {Matias, Vitor Pereira and Costa, M{\'a}rcus Vin{\'i}cius Lobo and Neto, Jo{\~a}o Batista and de Brito, Tiago Novello},
  journal = {arXiv preprint arXiv:2603.02475},
  year = {2026},
}

SSRN

Gaussian Splatting for Surface Reconstruction: A Survey

Vitor Pereira Matias, Daniel Perazzo, Vinícius Silva, and 4 more authors

SSRN Electronic Journal, 2026

DOI Bib HTML

@article{matias2026gaussiansurvey,
  title = {Gaussian Splatting for Surface Reconstruction: A Survey},
  author = {Matias, Vitor Pereira and Perazzo, Daniel and da Silva, Vin{\'i}cius and Raposo, C{\'e}sar and Velho, Luiz and Paiva, Afonso and Novello, Tiago},
  journal = {SSRN Electronic Journal},
  year = {2026},
  doi = {10.2139/ssrn.6779478},
}

SIBGRAPI

Enhancing Fairness in Machine Learning: Skin Tone Classification Using the Monk Skin Tone Scale

Vitor Pereira Matias and João Batista Neto

In Anais Estendidos da Conference on Graphics, Patterns and Images (SIBGRAPI), 2024

DOI Bib HTML PDF

@inproceedings{matias2024enhancing,
  title = {Enhancing Fairness in Machine Learning: Skin Tone Classification Using the Monk Skin Tone Scale},
  author = {Matias, Vitor Pereira and Neto, Jo{\~a}o Batista},
  booktitle = {Anais Estendidos da Conference on Graphics, Patterns and Images (SIBGRAPI)},
  year = {2024},
  pages = {76--81},
  doi = {10.5753/sibgrapi.est.2024.31648},
}

Thesis

Skin Tone Classification of Human Faces using the MST Scale

Vitor Pereira Matias

Universidade de São Paulo, 2025

Bib HTML PDF

@mastersthesis{matias2025skintone,
  title = {Skin Tone Classification of Human Faces using the {MST} Scale},
  author = {Matias, Vitor Pereira},
  school = {Universidade de S{\~a}o Paulo},
  year = {2025},
}

Semina

COVID-19 in Londrina-PR: SEIR Model with Parameter Optimization

Eliandro Rodrigues Cirilo, Paulo Laerte Natti, Pedro Henrique Valério Godoi, and 3 more authors

Semina: Ciências Exatas e Tecnológicas, 2021

DOI Bib HTML

@article{cirilo2021covid,
  title = {{COVID-19} in Londrina-{PR}: {SEIR} Model with Parameter Optimization},
  author = {Cirilo, Eliandro Rodrigues and Natti, Paulo Laerte and de Godoi, Pedro Henrique Val{\'e}rio and Lerma, Andina and Matias, Vitor Pereira and Romeiro, Neyva Maria Lopes},
  journal = {Semina: Ci{\^e}ncias Exatas e Tecnol{\'o}gicas},
  volume = {42},
  number = {1Supl},
  pages = {45--54},
  year = {2021},
  doi = {10.5433/1679-0375.2021v42n1Suplp45},
}

Matemática: um livro feito por alunos para alunos

Vitor Pereira Matias and others

2022

Bib

@book{matias2022matematica,
  title = {Matem{\'a}tica: um livro feito por alunos para alunos},
  author = {Matias, Vitor Pereira and others},
  year = {2022},
  publisher = {PET Matem{\'a}tica UEL},
  address = {Londrina},
}

Semana da Matemática Básica 2021

A. G. Aching, C. Moura Moreira, L. A. Tamura, and 2 more authors

In Anais do Pró-Ensino: Mostra Anual de Atividades de Ensino da UEL, 2021
Trabalho em conjunto para a produção de um livro

C. Moura Moreira, L. A. Tamura, P. F. M. Damazio, and 1 more author

In Anais do Pró-Ensino: Mostra Anual de Atividades de Ensino da UEL, 2020
Utilização do modelo epidemiológico SIRD com otimização de parâmetros para predizer o andamento de novos casos no Estado do Paraná

Vitor Pereira Matias, Eliandro Rodrigues Cirilo, A. A. S. Leão, and 2 more authors

In , 2021