Paulo Drews-Jr

Paulo Drews-Jr
Universidade Federal do Rio Grande (FURG) | FURG · Center for Computer Science - C ³

DSc. in Computer Science
Professor and Researcher at FURG/Brazil - Guest Professor at UniFreiburg/Germany

About

231
Publications
91,164
Reads
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2,567
Citations
Citations since 2017
139 Research Items
2225 Citations
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Introduction
Paulo Drews-Jr is a D.Sc. and M.Sc. in Computer Science at the Federal University of Minas Gerais(UFMG). His main research interests are robotics, computer vision, image processing, pattern recognition, and machine learning. He was a researcher at the ISR Coimbra. He was also a visiting researcher in the ASL at QCAT-CSIRO, Australia. Currently, he is Assistant Professor at the Federal University of Rio Grande - FURG and Visiting Scholar at the Robot Learning Lab at the University of Freiburg.
Additional affiliations
May 2021 - July 2022
University of Freiburg
Position
  • Guest Professor
Description
  • Researching on Robotic Perception and Machine Learning.
November 2014 - May 2015
The Commonwealth Scientific and Industrial Research Organisation
Position
  • Visiting Researcher
Description
  • Research on Robotics and Computer Vision
July 2010 - present
Universidade Federal do Rio Grande (FURG)
Position
  • Professor (Assistant)
Education
August 2011 - February 2016
Federal University of Minas Gerais
Field of study
  • Computer Science - Computer Vision and Robotics
March 2008 - December 2009
Federal University of Minas Gerais
Field of study
  • Computer Science - Computer Vision and Robotics

Publications

Publications (231)
Preprint
This work presents a study on parallel and distributional deep reinforcement learning applied to the mapless navigation of UAVs. For this, we developed an approach based on the Soft Actor-Critic method, producing a distributed and distributional variant named PDSAC, and compared it with a second one based on the traditional SAC algorithm. In additi...
Preprint
Full-text available
Deep Reinforcement Learning (Deep-RL) techniques for motion control have been continuously used to deal with decision-making problems for a wide variety of robots. Previous works showed that Deep-RL can be applied to perform mapless navigation, including the medium transition of Hybrid Unmanned Aerial Underwater Vehicles (HUAUVs). These are robots...
Article
Full-text available
This paper presents a cross-domain and cross-view framework for underwater robot localisation, which does not require any Global Positioning System (GPS) information. The proposed localisation method uses colour aerial images and underwater acoustic images to estimate the robot’s position. The method identifies the correlation among images from dis...
Article
Full-text available
This work deals with the closed-loop altitude control of a hybrid unmanned aerial-underwater vehicle (HUAUV) during media transition. Researches about HUAUVs are important for hard-to-reach operations. There are already several studies developed for unmanned vehicles, either in air or underwater. However, research on HUAUVs is a recent topic. There...
Preprint
Full-text available
Uncertainty estimation is crucial in safety-critical settings such as automated driving as it provides valuable information for several downstream tasks including high-level decision-making and path planning. In this work, we propose EvCenterNet, a novel uncertainty-aware 2D object detection framework utilizing evidential learning to directly estim...
Preprint
Full-text available
Bird's-Eye-View (BEV) semantic maps have become an essential component of automated driving pipelines due to the rich representation they provide for decision-making tasks. However, existing approaches for generating these maps still follow a fully supervised training paradigm and hence rely on large amounts of annotated BEV data. In this work, we...
Article
Robots have been increasingly used in applications involving welding of large metal structures, such as the naval industry, ensuring higher efficiency and repeatability at lower costs. However, inadequate communication between the robotics and the welding system can lead to internal and surface defects in the final product. Problems that occur duri...
Chapter
Full-text available
Underwater images suffer from degradation caused by water turbidity, light attenuation and color casting. An image enhancement procedure improves the perception and the analysis of the objects in the scene. Recent works based on deep learning approaches require synthetically paired datasets to train their models. In this work, it is present a self-...
Article
Sonar sensors are an important source of data for understanding underwater environments because the sound is invariant to water turbidity, as well as illumination condition changes. This work reconstructs the surface of underwater structures and quantifies the spatial variations between multiple readings using data acquired by a 2D Mechanical Scann...
Conference Paper
Este artigo apresenta um framework multi domínio e multi perspectiva para localização de robôs submarinos, que não requer nenhuma informação do Sistema de Posicionamento Global (GPS). O método de localização proposto usa imagens aéreas coloridas e imagens acústicas subaquáticas para estimar a posição do robô. O método identifica a correlação entre...
Preprint
Full-text available
Previous works showed that Deep-RL can be applied to perform mapless navigation, including the medium transition of Hybrid Unmanned Aerial Underwater Vehicles (HUAUVs). This paper presents new approaches based on the state-of-the-art actor-critic algorithms to address the navigation and medium transition problems for a HUAUV. We show that a double...
Preprint
Full-text available
Unmanned Aerial Vehicles (UAV) have been standing out due to the wide range of applications in which they can be used autonomously. However, they need intelligent systems capable of providing a greater understanding of what they perceive to perform several tasks. They become more challenging in complex environments since there is a need to perceive...
Preprint
Full-text available
Deterministic and Stochastic techniques in Deep Reinforcement Learning (Deep-RL) have become a promising solution to improve motion control and the decision-making tasks for a wide variety of robots. Previous works showed that these Deep-RL algorithms can be applied to perform mapless navigation of mobile robots in general. However, they tend to us...
Conference Paper
O Robot Operating System (ROS) é um dos mais populares softwares voltados ao desenvolvimento e pesquisa em robótica. Entretanto, estudos têm demonstrado diversos problemas de segurança em sua estrutura. Este trabalho avalia a aplicação de técnicas de detecção de intrusão no reconhecimento de ataques de injeção de dados nesses sistemas. Um modelo fo...
Preprint
Images acquired during underwater activities suffer from environmental properties of the water, such as turbidity and light attenuation. These phenomena cause color distortion, blurring, and contrast reduction. In addition, irregular ambient light distribution causes color channel unbalance and regions with high-intensity pixels. Recent works relat...
Article
Full-text available
Images acquired during underwater activities suffer from environmental properties of the water, such as turbidity and light attenuation. These phenomena cause color distortion, blurring, and contrast reduction. In addition, irregular ambient light distribution causes color channel unbalance and regions with high-intensity pixels. Recent works relat...
Conference Paper
A busca pelo desenvolvimento de novas tecnologias impulsa grandes desafios. Exemplo disto refere-se ao desenvolvimento de tarefas correlatas aos robôs móveis híbridos. In order to study and overcome these challenges, the present work seeks to establish an approach based on Deep Reinforcement Learning (Deep-RL) para navegação autônoma de um tipo esp...
Preprint
Reinforcement Learning (RL) has presented an impressive performance in video games through raw pixel imaging and continuous control tasks. However, RL performs poorly with high-dimensional observations such as raw pixel images. It is generally accepted that physical state-based RL policies such as laser sensor measurements give a more sample-effici...
Article
Full-text available
Cross-view image matches have been widely explored on terrestrial image localization using aerial images from drones or satellites. This study expands the cross-view image match idea and proposes a cross-domain and cross-view localization framework. The method identifies the correlation between color aerial images and underwater acoustic images to...
Article
Full-text available
In the last decade, a great effort has been employed in the study of Hybrid Unmanned Aerial Underwater Vehicles, robots that can easily fly and dive into the water with different levels of mechanical adaptation. However, most of this literature is concentrated on physical design, practical issues of construction, and, more recently, low-level contr...
Article
Full-text available
Recently, Deep Convolutional Neural Networks have been successfully applied to various robotics problems, such as robot vision and simultaneous localization and mapping. Among these, siamese and triplet networks have obtained great traction in intra-domain matching. However, it is impossible to directly use these networks in cross-domain problems....
Preprint
Full-text available
Cross-view image matches have been widely explored on terrestrial image localization using aerial images from drones or satellites. This study expands the cross-view image match idea and proposes a cross-domain and cross-view localization framework. The method identifies the correlation between color aerial images and underwater acoustic images to...
Article
Full-text available
This paper presents a novel deep reinforcement learning-based system for 3D mapless navigation for Unmanned Aerial Vehicles (UAVs). Instead of using an image-based sensing approach, we propose a simple learning system that uses only a few sparse range data from a distance sensor to train a learning agent. We based our approaches on two state-of-art...
Article
Full-text available
Modern imaging devices can capture faithful color and characteristics of natural and man-made scenes. However, there exist conditions in which the light radiated by objects cannot reach the camera’s lens or it is naturally degraded. Thus, the resulting captured images suffer from color loss. This article addresses the problem of underwater image re...
Preprint
Full-text available
This paper presents a novel deep reinforcement learning-based system for 3D mapless navigation for Unmanned Aerial Vehicles (UAVs). Instead of using a image-based sensing approach, we propose a simple learning system that uses only a few sparse range data from a distance sensor to train a learning agent. We based our approaches on two state-of-art...
Preprint
Full-text available
In the last decade, a great effort has been employed in the study of Hybrid Unmanned Aerial Underwater Vehicles, robots that can easily fly and dive into the water with different levels of mechanical adaptation. However, most of this literature is concentrated on physical design, practical issues of construction, and, more recently, low-level contr...
Article
Full-text available
Image segmentation is an important step in many computer vision and image processing algorithms. It is often adopted in tasks such as object detection, classification, and tracking. The segmentation of underwater images is a challenging problem as the water and particles present in the water scatter and absorb the light rays. These effects make the...
Conference Paper
Realizar a navegação entre meios é uma tarefa desafiadora para robôs móveis híbridos, especialmente em cenários com obstáculos. Este trabalho apresenta uma abordagem baseada em aprendizado por reforço profundo (Deep-RL) para navegação autônoma de um tipo específico de robô móvel híbrido: um Veículo Híbrido Tipo Ar-Água (HUAUV). A abordagem proposta...
Article
Full-text available
This paper proposes a modular system of precision agriculture to automate sprayers, optimizing the application of pesticides through a robotic system based on computer vision and individual nozzle on/off control. The system uses low-cost equipment such as Arduino boards, solenoid valves, pressure and flow sensors, smartphone, webcam, and Raspberry...
Preprint
Full-text available
Since the application of Deep Q-Learning to the continuous action domain in Atari-like games, Deep Reinforcement Learning (Deep-RL) techniques for motion control have been qualitatively enhanced. Nowadays, modern Deep-RL can be successfully applied to solve a wide range of complex decision-making tasks for many types of vehicles. Based on this cont...
Preprint
Full-text available
This paper proposes a modular system of precision agriculture to automate sprayers, optimizing the application of pesticides through a robotic system based on computer vision and individual nozzle on/off control. The system uses low-cost equipment such as Arduino boards, solenoid valves, pressure and flow sensors, smartphone, webcam, and Raspberry...
Article
Full-text available
Underwater navigation and localization are greatly enhanced by the use of acoustic images. However, such images are of difficult interpretation. Contrarily, aerial images are easier to interpret, but require Global Positioning System (GPS) sensors. Due to absorption phenomena, GPS sensors are unavailable in underwater environments. Thus, we propose...
Article
Full-text available
We propose an evaluation framework that emulates poor image exposure conditions, low-range image sensors, lossy compression, as well as noise types which are common in robot vision. We present a rigorous evaluation of the robustness of several high-level image recognition models and investigate their performance under distinct image distortions. On...
Preprint
Full-text available
We propose an evaluation framework that emulates poor image exposure conditions, low-range image sensors, lossy compression, as well as noise types which are common in robot vision. We present a rigorous evaluation of the robustness of several high-level image recognition models and investigate their performance under distinct image distortions. On...