Search Results for author: Ignas Budvytis

Found 25 papers, 11 papers with code

VRS-NeRF: Visual Relocalization with Sparse Neural Radiance Field

1 code implementation14 Apr 2024 Fei Xue, Ignas Budvytis, Daniel Olmeda Reino, Roberto Cipolla

However, in spite of high efficiency, APRs and SCRs have limited accuracy especially in large-scale outdoor scenes; HMs are accurate but need to store a large number of 2D descriptors for matching, resulting in poor efficiency.

Autonomous Driving regression

PRAM: Place Recognition Anywhere Model for Efficient Visual Localization

no code implementations11 Apr 2024 Fei Xue, Ignas Budvytis, Roberto Cipolla

Humans localize themselves efficiently in known environments by first recognizing landmarks defined on certain objects and their spatial relationships, and then verifying the location by aligning detailed structures of recognized objects with those in the memory.

Landmark Recognition Visual Localization

Task Agnostic Architecture for Algorithm Induction via Implicit Composition

no code implementations3 Apr 2024 Sahil J. Sindhi, Ignas Budvytis

Third, the observation that the main missing component in developing a truly generalised network is an efficient approach for self-consistent input of previously learnt sub-steps of an algorithm and their (implicit) composition during the network's internal forward pass.

In-Context Learning

DiaLoc: An Iterative Approach to Embodied Dialog Localization

no code implementations11 Mar 2024 Chao Zhang, Mohan Li, Ignas Budvytis, Stephan Liwicki

However, most existing works in embodied dialog research focus on navigation and leave the localization task understudied.

Function-constrained Program Synthesis

no code implementations27 Nov 2023 Patrick Hajali, Ignas Budvytis

Generating computer programs in general-purpose programming languages like Python poses a challenge for LLMs when instructed to use code provided in the prompt.

Code Generation Program Synthesis

A Neural Height-Map Approach for the Binocular Photometric Stereo Problem

no code implementations10 Nov 2023 Fotios Logothetis, Ignas Budvytis, Roberto Cipolla

As in recent neural multi-view shape estimation frameworks such as NeRF, SIREN and inverse graphics approaches to multi-view photometric stereo (e. g. PS-NeRF) we formulate shape estimation task as learning of a differentiable surface and texture representation by minimising surface normal discrepancy for normals estimated from multiple varying light images for two views as well as discrepancy between rendered surface intensity and observed images.

Sparse Multi-Object Render-and-Compare

no code implementations17 Oct 2023 Florian Langer, Ignas Budvytis, Roberto Cipolla

Introducing a new network architecture Multi-SPARC we learn to perform CAD model alignments for multiple detected objects jointly.

Object

IMP: Iterative Matching and Pose Estimation with Adaptive Pooling

1 code implementation CVPR 2023 Fei Xue, Ignas Budvytis, Roberto Cipolla

Previous methods solve feature matching and pose estimation using a two-stage process by first finding matches and then estimating the pose.

Pose Estimation

SFD2: Semantic-guided Feature Detection and Description

1 code implementation CVPR 2023 Fei Xue, Ignas Budvytis, Roberto Cipolla

Visual localization is a fundamental task for various applications including autonomous driving and robotics.

2k 4k +2

A CNN Based Approach for the Point-Light Photometric Stereo Problem

no code implementations10 Oct 2022 Fotios Logothetis, Roberto Mecca, Ignas Budvytis, Roberto Cipolla

Reconstructing the 3D shape of an object using several images under different light sources is a very challenging task, especially when realistic assumptions such as light propagation and attenuation, perspective viewing geometry and specular light reflection are considered.

SPARC: Sparse Render-and-Compare for CAD model alignment in a single RGB image

1 code implementation3 Oct 2022 Florian Langer, Gwangbin Bae, Ignas Budvytis, Roberto Cipolla

This combined information is the input to a pose prediction network, SPARC-Net which we train to predict a 9 DoF CAD model pose update.

Pose Prediction Retrieval

Efficient Large-Scale Localization by Global Instance Recognition

no code implementations CVPR 2022 Fei Xue, Ignas Budvytis, Daniel Olmeda Reino, Roberto Cipolla

Hierarchical frameworks consisting of both coarse and fine localization are often used as the standard pipeline for large-scale visual localization.

Visual Localization

Multi-View Depth Estimation by Fusing Single-View Depth Probability with Multi-View Geometry

1 code implementation CVPR 2022 Gwangbin Bae, Ignas Budvytis, Roberto Cipolla

To this end, we propose MaGNet, a novel framework for fusing single-view depth probability with multi-view geometry, to improve the accuracy, robustness and efficiency of multi-view depth estimation.

Depth Estimation

Leveraging Geometry for Shape Estimation from a Single RGB Image

1 code implementation10 Nov 2021 Florian Langer, Ignas Budvytis, Roberto Cipolla

In this work we demonstrate how cross-domain keypoint matches from an RGB image to a rendered CAD model allow for more precise object pose predictions compared to ones obtained through direct predictions.

Object Retrieval

Estimating and Exploiting the Aleatoric Uncertainty in Surface Normal Estimation

1 code implementation ICCV 2021 Gwangbin Bae, Ignas Budvytis, Roberto Cipolla

Experimental results show that the proposed method outperforms the state-of-the-art in ScanNet and NYUv2, and that the estimated uncertainty correlates well with the prediction error.

Scene Understanding Surface Normal Estimation +1

LUCES: A Dataset for Near-Field Point Light Source Photometric Stereo

no code implementations27 Apr 2021 Roberto Mecca, Fotios Logothetis, Ignas Budvytis, Roberto Cipolla

In order to fill the gap in evaluating near-field photometric stereo methods, we introduce LUCES the first real-world 'dataset for near-fieLd point light soUrCe photomEtric Stereo' of 14 objects of a varying of materials.

Probabilistic 3D Human Shape and Pose Estimation from Multiple Unconstrained Images in the Wild

no code implementations CVPR 2021 Akash Sengupta, Ignas Budvytis, Roberto Cipolla

In contrast, we propose a new task: shape and pose estimation from a group of multiple images of a human subject, without constraints on subject pose, camera viewpoint or background conditions between images in the group.

3D Human Shape Estimation Pose Prediction

Synthetic Training for Accurate 3D Human Pose and Shape Estimation in the Wild

1 code implementation21 Sep 2020 Akash Sengupta, Ignas Budvytis, Roberto Cipolla

Thus, we propose STRAPS (Synthetic Training for Real Accurate Pose and Shape), a system that utilises proxy representations, such as silhouettes and 2D joints, as inputs to a shape and pose regression neural network, which is trained with synthetic training data (generated on-the-fly during training using the SMPL statistical body model) to overcome data scarcity.

3D human pose and shape estimation 3D Human Shape Estimation +3

A CNN Based Approach for the Near-Field Photometric Stereo Problem

no code implementations12 Sep 2020 Fotios Logothetis, Ignas Budvytis, Roberto Mecca, Roberto Cipolla

Secondly, we compute the depth by integrating the normal field in order to iteratively estimate light directions and attenuation which is used to compensate the input images to compute reflectance samples for the next iteration.

PX-NET: Simple and Efficient Pixel-Wise Training of Photometric Stereo Networks

no code implementations ICCV 2021 Fotios Logothetis, Ignas Budvytis, Roberto Mecca, Roberto Cipolla

We show that global physical effects can be approximated on the observation map domain and this simplifies and speeds up the data creation procedure.

Data Augmentation

Large Scale Joint Semantic Re-Localisation and Scene Understanding via Globally Unique Instance Coordinate Regression

no code implementations23 Sep 2019 Ignas Budvytis, Marvin Teichmann, Tomas Vojir, Roberto Cipolla

We obtain smaller mean distance and angular errors than state-of-the-art 6-DoF pose estimation algorithms based on direct pose regression and pose estimation from scene coordinates on all datasets.

Autonomous Driving Pose Estimation +2

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