Search Results for author: Maks Ovsjanikov

Found 49 papers, 35 papers with code

SATR: Zero-Shot Semantic Segmentation of 3D Shapes

no code implementations11 Apr 2023 Ahmed Abdelreheem, Ivan Skorokhodov, Maks Ovsjanikov, Peter Wonka

We explore the task of zero-shot semantic segmentation of 3D shapes by using large-scale off-the-shelf 2D image recognition models.

Semantic Segmentation

Understanding and Improving Features Learned in Deep Functional Maps

no code implementations CVPR 2023 Souhaib Attaiki, Maks Ovsjanikov

In this paper, we show that under some mild conditions, the features learned within deep functional map approaches can be used as point-wise descriptors and thus are directly comparable across different shapes, even without the necessity of solving for a functional map at test time.

Generalizable Local Feature Pre-training for Deformable Shape Analysis

1 code implementation CVPR 2023 Souhaib Attaiki, Lei LI, Maks Ovsjanikov

We observe that with proper training, learned features can be useful in such tasks, but, crucially, only with an appropriate choice of the receptive field size.

Transfer Learning

NCP: Neural Correspondence Prior for Effective Unsupervised Shape Matching

1 code implementation14 Jan 2023 Souhaib Attaiki, Maks Ovsjanikov

We present Neural Correspondence Prior (NCP), a new paradigm for computing correspondences between 3D shapes.


TIDE: Time Derivative Diffusion for Deep Learning on Graphs

1 code implementation5 Dec 2022 Maximilian Krahn, Maysam Behmanesh, Maks Ovsjanikov

A prominent paradigm for graph neural networks is based on the message passing framework.

Equivalence Between SE(3) Equivariant Networks via Steerable Kernels and Group Convolution

no code implementations29 Nov 2022 Adrien Poulenard, Maks Ovsjanikov, Leonidas J. Guibas

Most approaches for equivariance under the Euclidean group $\mathrm{SE}(3)$ of rotations and translations fall within one of the two major categories.

Reduced Representation of Deformation Fields for Effective Non-rigid Shape Matching

1 code implementation26 Nov 2022 Ramana Sundararaman, Riccardo Marin, Emanuele Rodola, Maks Ovsjanikov

In this work we present a novel approach for computing correspondences between non-rigid objects, by exploiting a reduced representation of deformation fields.

Learning Multi-resolution Functional Maps with Spectral Attention for Robust Shape Matching

1 code implementation12 Oct 2022 Lei LI, Nicolas Donati, Maks Ovsjanikov

Our approach is not only accurate with near-isometric input, for which a high spectral resolution is typically preferred, but also robust and able to produce reasonable matching even in the presence of significant non-isometric distortion, which poses great challenges to existing methods.

Smooth Non-Rigid Shape Matching via Effective Dirichlet Energy Optimization

1 code implementation5 Oct 2022 Robin Magnet, Jing Ren, Olga Sorkine-Hornung, Maks Ovsjanikov

We introduce pointwise map smoothness via the Dirichlet energy into the functional map pipeline, and propose an algorithm for optimizing it efficiently, which leads to high-quality results in challenging settings.

Affection: Learning Affective Explanations for Real-World Visual Data

no code implementations CVPR 2023 Panos Achlioptas, Maks Ovsjanikov, Leonidas Guibas, Sergey Tulyakov

To embark on this journey, we introduce and share with the research community a large-scale dataset that contains emotional reactions and free-form textual explanations for 85, 007 publicly available images, analyzed by 6, 283 annotators who were asked to indicate and explain how and why they felt in a particular way when observing a specific image, producing a total of 526, 749 responses.

SRFeat: Learning Locally Accurate and Globally Consistent Non-Rigid Shape Correspondence

1 code implementation16 Sep 2022 Lei LI, Souhaib Attaiki, Maks Ovsjanikov

In this work, we present a novel learning-based framework that combines the local accuracy of contrastive learning with the global consistency of geometric approaches, for robust non-rigid matching.

Contrastive Learning

Non-Isometric Shape Matching via Functional Maps on Landmark-Adapted Bases

1 code implementation10 May 2022 Mikhail Panine, Maxime Kirgo, Maks Ovsjanikov

We propose a principled approach for non-isometric landmark-preserving non-rigid shape matching.

Deep Orientation-Aware Functional Maps: Tackling Symmetry Issues in Shape Matching

1 code implementation CVPR 2022 Nicolas Donati, Etienne Corman, Maks Ovsjanikov

State-of-the-art fully intrinsic networks for non-rigid shape matching often struggle to disambiguate the symmetries of the shapes leading to unstable correspondence predictions.

Implicit field supervision for robust non-rigid shape matching

1 code implementation15 Mar 2022 Ramana Sundararaman, Gautam Pai, Maks Ovsjanikov

Establishing a correspondence between two non-rigidly deforming shapes is one of the most fundamental problems in visual computing.

Data Augmentation

Physical Simulation Layer for Accurate 3D Modeling

no code implementations CVPR 2022 Mariem Mezghanni, Théo Bodrito, Malika Boulkenafed, Maks Ovsjanikov

We introduce a novel approach for generative 3D modeling that explicitly encourages the physical and thus functional consistency of the generated shapes.

Complex Functional Maps : a Conformal Link Between Tangent Bundles

2 code implementations17 Dec 2021 Nicolas Donati, Etienne Corman, Simone Melzi, Maks Ovsjanikov

In this paper, we introduce complex functional maps, which extend the functional map framework to conformal maps between tangent vector fields on surfaces.

Smoothness and effective regularizations in learned embeddings for shape matching

1 code implementation14 Dec 2021 Riccardo Marin, Souhaib Attaiki, Simone Melzi, Emanuele Rodolà, Maks Ovsjanikov

In this study, we analyze, for the first time, properties that arise in data-driven learned embedding and their relation to the shape-matching task.

Joint Symmetry Detection and Shape Matching for Non-Rigid Point Cloud

no code implementations5 Dec 2021 Abhishek Sharma, Maks Ovsjanikov

Despite the success of deep functional maps in non-rigid 3D shape matching, there exists no learning framework that models both self-symmetry and shape matching simultaneously.

Symmetry Detection

DPFM: Deep Partial Functional Maps

1 code implementation19 Oct 2021 Souhaib Attaiki, Gautam Pai, Maks Ovsjanikov

We consider the problem of computing dense correspondences between non-rigid shapes with potentially significant partiality.

Learning Canonical Embedding for Non-rigid Shape Matching

no code implementations6 Oct 2021 Abhishek Sharma, Maks Ovsjanikov

This paper provides a novel framework that learns canonical embeddings for non-rigid shape matching.

Differentiable Surface Triangulation

1 code implementation22 Sep 2021 Marie-Julie Rakotosaona, Noam Aigerman, Niloy Mitra, Maks Ovsjanikov, Paul Guerrero

Our method builds on the result that any 2D triangulation can be achieved by a suitably perturbed weighted Delaunay triangulation.

WSDesc: Weakly Supervised 3D Local Descriptor Learning for Point Cloud Registration

1 code implementation5 Aug 2021 Lei LI, Hongbo Fu, Maks Ovsjanikov

Instead of using a predefined fixed-size local support in voxelization, we propose to learn the optimal support in a data-driven manner.

Metric Learning Point Cloud Registration

Fast Sinkhorn Filters: Using Matrix Scaling for Non-Rigid Shape Correspondence With Functional Maps

no code implementations CVPR 2021 Gautam Pai, Jing Ren, Simone Melzi, Peter Wonka, Maks Ovsjanikov

In this paper, we provide a theoretical foundation for pointwise map recovery from functional maps and highlight its relation to a range of shape correspondence methods based on spectral alignment.

Physically-Aware Generative Network for 3D Shape Modeling

no code implementations CVPR 2021 Mariem Mezghanni, Malika Boulkenafed, Andre Lieutier, Maks Ovsjanikov

In particular, we introduce a loss and a learning framework that promote two key characteristics of the generated shapes: their connectivity and physical stability.

3D Shape Modeling

Learning Spectral Unions of Partial Deformable 3D Shapes

1 code implementation31 Mar 2021 Luca Moschella, Simone Melzi, Luca Cosmo, Filippo Maggioli, Or Litany, Maks Ovsjanikov, Leonidas Guibas, Emanuele Rodolà

Spectral geometric methods have brought revolutionary changes to the field of geometry processing.

Matrix Decomposition on Graphs: A Functional View

no code implementations5 Feb 2021 Abhishek Sharma, Maks Ovsjanikov

We propose a functional view of matrix decomposition problems on graphs such as geometric matrix completion and graph regularized dimensionality reduction.

Dimensionality Reduction Matrix Completion

ArtEmis: Affective Language for Visual Art

2 code implementations CVPR 2021 Panos Achlioptas, Maks Ovsjanikov, Kilichbek Haydarov, Mohamed Elhoseiny, Leonidas Guibas

We present a novel large-scale dataset and accompanying machine learning models aimed at providing a detailed understanding of the interplay between visual content, its emotional effect, and explanations for the latter in language.

DWKS: A Local Descriptor of Deformations Between Meshes and Point Clouds

1 code implementation ICCV 2021 Robin Magnet, Maks Ovsjanikov

We propose a novel pointwise descriptor, called DWKS, aimed at finding correspondences across two deformable shape collections.

Learning Delaunay Surface Elements for Mesh Reconstruction

1 code implementation CVPR 2021 Marie-Julie Rakotosaona, Paul Guerrero, Noam Aigerman, Niloy Mitra, Maks Ovsjanikov

We leverage the properties of 2D Delaunay triangulations to construct a mesh from manifold surface elements.

DiffusionNet: Discretization Agnostic Learning on Surfaces

4 code implementations1 Dec 2020 Nicholas Sharp, Souhaib Attaiki, Keenan Crane, Maks Ovsjanikov

We introduce a new general-purpose approach to deep learning on 3D surfaces, based on the insight that a simple diffusion layer is highly effective for spatial communication.

Weakly Supervised Deep Functional Maps for Shape Matching

1 code implementation NeurIPS 2020 Abhishek Sharma, Maks Ovsjanikov

We show empirically the minimum components for obtaining state-of-the-art results with different loss functions, supervised as well as unsupervised.

Correspondence Learning via Linearly-invariant Embedding

1 code implementation NeurIPS 2020 Riccardo Marin, Marie-Julie Rakotosaona, Simone Melzi, Maks Ovsjanikov

However, instead of using the Laplace-Beltrami eigenfunctions as done in virtually all previous works in this domain, we demonstrate that learning the basis from data can both improve robustness and lead to better accuracy in challenging settings.

Ranked #6 on 3D Dense Shape Correspondence on SHREC'19 (using extra training data)

3D Dense Shape Correspondence

Geometric Matrix Completion: A Functional View

1 code implementation29 Sep 2020 Abhishek Sharma, Maks Ovsjanikov

We propose a totally functional view of geometric matrix completion problem.

Matrix Completion

Weakly Supervised Deep Functional Map for Shape Matching

2 code implementations28 Sep 2020 Abhishek Sharma, Maks Ovsjanikov

We show empirically minimum components for obtaining state of the art results with different loss functions, supervised as well as unsupervised.

PointTriNet: Learned Triangulation of 3D Point Sets

1 code implementation ECCV 2020 Nicholas Sharp, Maks Ovsjanikov

This work considers a new task in geometric deep learning: generating a triangulation among a set of points in 3D space.

Intrinsic Point Cloud Interpolation via Dual Latent Space Navigation

1 code implementation ECCV 2020 Marie-Julie Rakotosaona, Maks Ovsjanikov

We present a learning-based method for interpolating and manipulating 3D shapes represented as point clouds, that is explicitly designed to preserve intrinsic shape properties.

Deep Geometric Functional Maps: Robust Feature Learning for Shape Correspondence

3 code implementations CVPR 2020 Nicolas Donati, Abhishek Sharma, Maks Ovsjanikov

We present a novel learning-based approach for computing correspondences between non-rigid 3D shapes.

OperatorNet: Recovering 3D Shapes From Difference Operators

1 code implementation ICCV 2019 Ruqi Huang, Marie-Julie Rakotosaona, Panos Achlioptas, Leonidas Guibas, Maks Ovsjanikov

This paper proposes a learning-based framework for reconstructing 3D shapes from functional operators, compactly encoded as small-sized matrices.

ZoomOut: Spectral Upsampling for Efficient Shape Correspondence

2 code implementations16 Apr 2019 Simone Melzi, Jing Ren, Emanuele Rodolà, Abhishek Sharma, Peter Wonka, Maks Ovsjanikov

Our main observation is that high quality maps can be obtained even if the input correspondences are noisy or are encoded by a small number of coefficients in a spectral basis.


PointCleanNet: Learning to Denoise and Remove Outliers from Dense Point Clouds

1 code implementation4 Jan 2019 Marie-Julie Rakotosaona, Vittorio La Barbera, Paul Guerrero, Niloy J. Mitra, Maks Ovsjanikov

Point clouds obtained with 3D scanners or by image-based reconstruction techniques are often corrupted with significant amount of noise and outliers.

Denoising Surface Reconstruction

Unsupervised Deep Learning for Structured Shape Matching

4 code implementations ICCV 2019 Jean-Michel Roufosse, Abhishek Sharma, Maks Ovsjanikov

We present a novel method for computing correspondences across 3D shapes using unsupervised learning.

Isospectralization, or how to hear shape, style, and correspondence

1 code implementation CVPR 2019 Luca Cosmo, Mikhail Panine, Arianna Rampini, Maks Ovsjanikov, Michael M. Bronstein, Emanuele Rodolà

The question whether one can recover the shape of a geometric object from its Laplacian spectrum ('hear the shape of the drum') is a classical problem in spectral geometry with a broad range of implications and applications.

Style Transfer

Multi-directional Geodesic Neural Networks via Equivariant Convolution

no code implementations1 Oct 2018 Adrien Poulenard, Maks Ovsjanikov

Our construction, which we call multi-directional geodesic convolution, or directional convolution for short, allows, in particular, to propagate and relate directional information across layers and thus different regions on the shape.

PCPNET: Learning Local Shape Properties from Raw Point Clouds

34 code implementations13 Oct 2017 Paul Guerrero, Yanir Kleiman, Maks Ovsjanikov, Niloy J. Mitra

In this paper, we propose PCPNet, a deep-learning based approach for estimating local 3D shape properties in point clouds.

Computational Geometry

Unsupervised Multi-Class Joint Image Segmentation

no code implementations CVPR 2014 Fan Wang, Qi-Xing Huang, Maks Ovsjanikov, Leonidas J. Guibas

Joint segmentation of image sets is a challenging problem, especially when there are multiple objects with variable appearance shared among the images in the collection and the set of objects present in each particular image is itself varying and unknown.

Image Segmentation Semantic Segmentation

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