Search Results for author: Pedro Miraldo

Found 20 papers, 4 papers with code

Oriented-grid Encoder for 3D Implicit Representations

no code implementations9 Feb 2024 Arihant Gaur, G. Dias Pais, Pedro Miraldo

Compared to the use of regular grids, our geometric encoder is shown to converge in fewer steps and obtain sharper 3D surfaces.

Mapping of Sparse 3D Data using Alternating Projection

no code implementations4 Oct 2020 Siddhant Ranade, Xin Yu, Shantnu Kakkar, Pedro Miraldo, Srikumar Ramalingam

We propose a novel technique to register sparse 3D scans in the absence of texture.

Active Depth Estimation: Stability Analysis and its Applications

no code implementations16 Mar 2020 Romulo T. Rodrigues, Pedro Miraldo, Dimos V. Dimarogonas, A. Pedro Aguiar

Recovering the 3D structure of the surrounding environment is an essential task in any vision-controlled Structure-from-Motion (SfM) scheme.

Depth Estimation

A Framework for Depth Estimation and Relative Localization of Ground Robots using Computer Vision

no code implementations1 Aug 2019 Romulo T. Rodrigues, Pedro Miraldo, Dimos V. Dimarogonas, A. Pedro Aguiar

The basic idea consists in estimating the depth of the points by explicitly considering the dynamics of the camera mounted on a ground robot, and feeding the estimates of 3D points observed by both cameras in a filter that computes the relative pose between the robots.

3D Depth Estimation Pose Estimation

Can generalised relative pose estimation solve sparse 3D registration?

no code implementations13 Jun 2019 Siddhant Ranade, Xin Yu, Shantnu Kakkar, Pedro Miraldo, Srikumar Ramalingam

In contrast to correspondence based methods, we take a different viewpoint and formulate the sparse 3D registration problem based on the constraints from the intersection of line segments from adjacent scans.

Pose Estimation

POSEAMM: A Unified Framework for Solving Pose Problems using an Alternating Minimization Method

no code implementations9 Apr 2019 Joao Campos, Joao R. Cardoso, Pedro Miraldo

Since the objective function will depend on the rotation and translation it is not possible to solve it as a simple minimization problem.

Pose Estimation Translation

Minimal Solvers for Mini-Loop Closures in 3D Multi-Scan Alignment

no code implementations CVPR 2019 Pedro Miraldo, Surojit Saha, Srikumar Ramalingam

3D scan registration is a classical, yet a highly useful problem in the context of 3D sensors such as Kinect and Velodyne.

3DRegNet: A Deep Neural Network for 3D Point Registration

1 code implementation CVPR 2020 G. Dias Pais, Srikumar Ramalingam, Venu Madhav Govindu, Jacinto C. Nascimento, Rama Chellappa, Pedro Miraldo

Given a set of 3D point correspondences, we build a deep neural network to address the following two challenges: (i) classification of the point correspondences into inliers/outliers, and (ii) regression of the motion parameters that align the scans into a common reference frame.

regression

Analytical Modeling of Vanishing Points and Curves in Catadioptric Cameras

no code implementations CVPR 2018 Pedro Miraldo, Francisco Eiras, Srikumar Ramalingam

Vanishing points and vanishing lines are classical geometrical concepts in perspective cameras that have a lineage dating back to 3 centuries.

Pose Estimation

3D Reconstruction with Low Resolution, Small Baseline and High Radial Distortion Stereo Images

no code implementations19 Sep 2017 Tiago Dias, Helder Araujo, Pedro Miraldo

The approaches tested were based on the use of the polynomial model of radial distortion, and on the application of the division model.

3D Reconstruction

On the Generalized Essential Matrix Correction: An efficient solution to the problem and its applications

no code implementations19 Sep 2017 Pedro Miraldo, Joao R. Cardoso

This paper addresses the problem of finding the closest generalized essential matrix from a given $6\times 6$ matrix, with respect to the Frobenius norm.

Efficient and Robust Pedestrian Detection using Deep Learning for Human-Aware Navigation

no code implementations15 Jul 2016 Andre Mateus, David Ribeiro, Pedro Miraldo, Jacinto C. Nascimento

This paper addresses the problem of Human-Aware Navigation (HAN), using multi camera sensors to implement a vision-based person tracking system.

Human Detection Pedestrian Detection

A Real-Time Deep Learning Pedestrian Detector for Robot Navigation

no code implementations15 Jul 2016 David Ribeiro, Andre Mateus, Pedro Miraldo, Jacinto C. Nascimento

A real-time Deep Learning based method for Pedestrian Detection (PD) is applied to the Human-Aware robot navigation problem.

Pedestrian Detection Robot Navigation

Non-Central Catadioptric Cameras Pose Estimation using 3D Lines

no code implementations8 Jul 2016 Andre Mateus, Pedro Miraldo, Pedro U. Lima

This method is based on an analytic solution (which we derived) for the projection of 3D straight lines, onto the mirror of Non-Central Catadioptric Cameras (NCCS).

Pose Estimation Translation

Plücker Correction Problem: Analysis and Improvements in Efficiency

no code implementations18 Feb 2016 João R. Cardoso, Pedro Miraldo, Helder Araujo

A given six dimensional vector represents a 3D straight line in Plucker coordinates if its coordinates satisfy the Klein quadric constraint.

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