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24 novembre 2022

Master Internship in Shape Registration

Catégorie : Stagiaire

The Imagine team at LIRIS laboratory, Lyon- France is offering a master internship in deformable shape registration .

The project will be supervised by Dr. Julie Digne (julie.digne@cnrs.fr) and Dr. Shaifali Parashar (shaifali.parashar@liris.cnrs.fr) .

Masters in computer vision, robotics, machine learning, mathematics or any field related to the topic
Strong programming skills in C++ and python
Fluency in English
Project duration: 6 months
Tentative start date: February 2023
How to apply:
Please send your CV, transcripts and 2 reference letters to Julie Digne and Shaifali Parashar with the subject "Internship:Shape Registration ".


Many applications such as UV-mapping, shape analysis, shape interpolation, sparse to dense reconstruction and partial scan-completion rely on the availability of a surface representation that is coherent across different instances, ie, each point on one surface maps to a point with the same semantic meaning on another. In the literature, the most common way to achieve coherence consists of explicitly computing and establishing correspondences between input representations, such as 3D meshes[1] or 3D point clouds[2]. Such a registration is discrete, and obtaining a continuous, smooth registration between the input representations is difficult and non-accurate.

In our previous works[3], we tackled this problem more directly by learning to reconstruct temporally-coherent surfaces from a sequence of 3D point clouds representing a shape deforming over time. This allows a compact, coherent representation of objects which can be easily used in the above-mentioned applications. In order to learn a dense registration, we rely on the preservation of intrinsic geometric properties of the shapes in addition to a global coherence by minimising distances between corresponding point sets. Such a formulation is accurate, robust but quite expensive which prohibits its usage in real-life scenarios. In this project, we aim to speed up the process. Our goal is to develop fast matching techniques that loosely preserve the intrinsic geometric properties so that a quick and decently accurate registration can be obtained. This requires approximation of intrinsic geometric properties using simpler mathematical formulations, such as normal and curvature analysis. Our focus will be on identifying and matching local structures with relatively unique surface properties.


[1] Roufosse et al, ICCV 2019. Unsupervised deep learning for structured shape matching.

[2] Groueix et al, CGF 2019. Unsupervised cycle consistent deformation for shape matching.

[3] Bednarik et al, ICCV 2022. Temporally-Coherent Surface Reconstruction via Metric-Consistent Atlases.


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