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Alfredo Martins
International Student Exchange Programs
EngineeringComputer visionComputer scienceSimulationUnderwater
96Publications
11H-index
538Citations
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Publications 102
Newest
#1Gabriel Loureiro (P.PORTO: Polytechnic Institute of Porto)
#2Luís Soares (P.PORTO: Polytechnic Institute of Porto)H-Index: 1
Last. Alfredo Martins (P.PORTO: Polytechnic Institute of Porto)H-Index: 11
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#1Pedro Guedes (International Student Exchange Programs)H-Index: 2
#2Nuno Viana (International Student Exchange Programs)
Last. Eduardo Silva (P.PORTO: Polytechnic Institute of Porto)H-Index: 10
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For the context of a mobile tracking system, an underwater acoustic positioning system was developed, using three hydrophones to compute the direction of an acoustic source relative to an Autonomous Surface Vehicle (ASV). The paper presents an algorithm for the Direction of Arrival (DoA) of an acoustic source, which allows to estimate its position. Preliminary results will be shown in this paper relative to the detection and identification (ID) of the acoustic sources, as well as an analysis of ...
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#1Pedro Geraldes (P.PORTO: Polytechnic Institute of Porto)
#2Joel Barbosa (P.PORTO: Polytechnic Institute of Porto)
Last. Eduardo Ferreira da SilvaH-Index: 15
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Zooplankton plays a key-role on Earth’s ecosystem, emerging in the oceans and rivers in great quantities and diversity, making it an important and rather common topic on scientific studies. Given the numbers of different species it is not only necessary to study their numbers but also their classification. In this paper a possible solution for the zooplankton in situ detection and classification problem in real-time is proposed using a portable deep learning approach based on Convolutional Neura...
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#1Mónica SampaioH-Index: 2
Last. M. AmilH-Index: 2
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#1Andre Dias (ISEP: Instituto Superior de Engenharia do Porto)H-Index: 8
#2Ana P. MuchaH-Index: 21
Last. Eduardo Silva (ISEP: Instituto Superior de Engenharia do Porto)H-Index: 10
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The overall aim of the ROSM project is the implementation of an innovative solution based on heterogeneous autonomous vehicles to tackle maritime pollution (in particular, oil spills). These solutions will be based on native microbial consortia with bioremediation capacity, and the adaptation of air and surface autonomous vehicles for in-situ release of autochthonous microorganisms (bioaugmentation) and nutrients (biostimulation). By doing so, these systems can be used as the first line of the r...
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#1Daniel Freire (P.PORTO: Polytechnic Institute of Porto)
#2Jose Silva (P.PORTO: Polytechnic Institute of Porto)H-Index: 3
Last. Alfredo MartinsH-Index: 11
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Autonomous Surface Vehicles (ASVs), operating near ship harbors or relatively close to shorelines must be able to steer away from incoming vessels and other possible obstacles, be they dynamic or not. To do this, one must implement some type of multi-target tracking and obstacle avoidance algorithms that lets the vehicle dodge obstacles. This paper presents a radar-based multi-target tracking system developed for obstacle detection in a small unmanned surface vehicle. The system was designed for...
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#1Shravan Dev Rajesh (P.PORTO: Polytechnic Institute of Porto)
#2Jose Miguel AlmeidaH-Index: 11
Last. Alfredo MartinsH-Index: 11
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The exploration of water bodies from the sea to land filled water spaces has seen a continuous increase with new technologies such as robotics. Underwater images is one of the main sensor resources used but suffer from added problems due to the environment. Multiple methods and techniques have provided a way to correct the color, clear the poor quality and enhance the features. In this paper, we present the work of an Image Cleaning and Enhancement Technique which is based on performing color co...
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#1A. OliveiraH-Index: 1
Last. Eduardo Silva (ISEP: Instituto Superior de Engenharia do Porto)H-Index: 10
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Over the last few years, oil spill incidents occured with some regularity during exploration, production and transportation, causing a large economic and ecologic impact in the world community. To minimise these impacts and reduce the time response of the initial mitigation process, autonomous vehicles, such as unmanned aerial vehicles (UAV) can be used to perform oil spill monitoring and mitigation.This paper presents the design and implementation of a multirotor UAV capable of identifying and ...
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#1Hugo RibeiroH-Index: 8
#2Alfredo MartinsH-Index: 11
Last. Catarina MagalhãesH-Index: 17
view all 14 authors...
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#1Michael Bleier (University of Würzburg)H-Index: 3
#2Carlos AlmeidaH-Index: 6
Last. Andreas Nüchter (University of Würzburg)H-Index: 35
view all 12 authors...
Abstract. The project Viable Alternative Mine Operating System (iVAMOS!) develops a novel underwater mining technique for extracting inland mineral deposits in flooded open-cut mines. From a floating launch and recovery vessel a remotely-operated underwater mining vehicle with a roadheader cutting machine is deployed. The cut material is transported to the surface via a flexible riser hose. Since there is no direct intervisibility between the operator and the mining machine, the data of the sens...
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