Search Results for author: Theocharis Theocharides

Found 18 papers, 6 papers with code

Convolutional Channel-wise Competitive Learning for the Forward-Forward Algorithm

1 code implementation19 Dec 2023 Andreas Papachristodoulou, Christos Kyrkou, Stelios Timotheou, Theocharis Theocharides

The Forward-Forward (FF) Algorithm has been recently proposed to alleviate the issues of backpropagation (BP) commonly used to train deep neural networks.

Image Classification

Joint Estimation and Control for Multi-Target Passive Monitoring with an Autonomous UAV Agent

no code implementations13 Jul 2023 Savvas Papaioannou, Christos Laoudias, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou

This work considers the problem of passively monitoring multiple moving targets with a single unmanned aerial vehicle (UAV) agent equipped with a direction-finding radar.

Integrated Guidance and Gimbal Control for Coverage Planning With Visibility Constraints

no code implementations22 May 2023 Savvas Papaioannou, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou, Marios M. Polycarpou

This work proposes an integrated guidance and gimbal control coverage path planning (CPP) approach, in which the mobility and gimbal inputs of an autonomous UAV agent are jointly controlled and optimized to achieve full coverage of a given object of interest, according to a specified set of optimality criteria.

Distributed Search Planning in 3-D Environments With a Dynamically Varying Number of Agents

no code implementations18 Apr 2023 Savvas Papaioannou, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou, Marios M. Polycarpou

In this work, a novel distributed search-planning framework is proposed, where a dynamically varying team of autonomous agents cooperate in order to search multiple objects of interest in three-dimension (3-D).

Model Predictive Control

Jointly-Optimized Searching and Tracking with Random Finite Sets

no code implementations1 Feb 2023 Savvas Papaioannou, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou, Marios M. Polycarpou

In this paper, we investigate the problem of joint searching and tracking of multiple mobile targets by a group of mobile agents.

Probabilistic Search and Track with Multiple Mobile Agents

no code implementations1 Feb 2023 Savvas Papaioannou, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou, Marios M. Polycarpou

In this paper we are interested in the task of searching and tracking multiple moving targets in a bounded surveillance area with a group of autonomous mobile agents.

Decentralized Search and Track with Multiple Autonomous Agents

no code implementations1 Feb 2023 Savvas Papaioannou, Panayiotis Kolios, Theocharis Theocharides, Christos G. Panayiotou, Marios M. Polycarpou

Based on this, we develop decentralized cooperative look-ahead strategies for efficient searching and tracking of an unknown number of targets inside a bounded surveillance area.

Towards a Fully Autonomous UAV Controller for Moving Platform Detection and Landing

no code implementations30 Sep 2022 Michalis Piponidis, Panayiotis Aristodemou, Theocharis Theocharides

While Unmanned Aerial Vehicles (UAVs) are increasingly deployed in several missions, their inability of reliable and consistent autonomous landing poses a major setback for deploying such systems truly autonomously.

Reinforcement Learning (RL)

DriveGuard: Robustification of Automated Driving Systems with Deep Spatio-Temporal Convolutional Autoencoder

no code implementations5 Nov 2021 Andreas Papachristodoulou, Christos Kyrkou, Theocharis Theocharides

We explore the space of different autoencoder architectures and evaluate them on a diverse dataset created with real and synthetic images demonstrating that by exploiting spatio-temporal information combined with multi-component loss we significantly increase robustness against adverse image effects reaching within 5-6% of that of the original model on clean images.

Autonomous Vehicles Image Segmentation +2

EmergencyNet: Efficient Aerial Image Classification for Drone-Based Emergency Monitoring Using Atrous Convolutional Feature Fusion

1 code implementation28 Apr 2021 Christos Kyrkou, Theocharis Theocharides

Deep learning-based algorithms can provide state-of-the-art accuracy for remote sensing technologies such as unmanned aerial vehicles (UAVs)/drones, potentially enhancing their remote sensing capabilities for many emergency response and disaster management applications.

Image Classification Management

Robust Machine Learning Systems: Challenges, Current Trends, Perspectives, and the Road Ahead

no code implementations4 Jan 2021 Muhammad Shafique, Mahum Naseer, Theocharis Theocharides, Christos Kyrkou, Onur Mutlu, Lois Orosa, Jungwook Choi

Machine Learning (ML) techniques have been rapidly adopted by smart Cyber-Physical Systems (CPS) and Internet-of-Things (IoT) due to their powerful decision-making capabilities.

BIG-bench Machine Learning Decision Making

Extracting the fundamental diagram from aerial footage

1 code implementation7 Jul 2020 Rafael Makrigiorgis, Panayiotis Kolios, Stelios Timotheou, Theocharis Theocharides, Christos G. Panayiotou

At large, this system behavior is characterized through the fundamental diagram of a road segment, a region or the network.

Efficient ConvNet-based Object Detection for Unmanned Aerial Vehicles by Selective Tile Processing

1 code implementation14 Nov 2019 George Plastiras, Christos Kyrkou, Theocharis Theocharides

Many applications utilizing Unmanned Aerial Vehicles (UAVs) require the use of computer vision algorithms to analyze the information captured from their on-board camera.

object-detection Object Detection

EdgeNet: Balancing Accuracy and Performance for Edge-based Convolutional Neural Network Object Detectors

no code implementations14 Nov 2019 George Plastiras, Christos Kyrkou, Theocharis Theocharides

Moreover, a use-case for pedestrian detection from Unmanned-Areal-Vehicle (UAV) is presented showing the impact that the proposed approach has on sensitivity, average processing time and power consumption when is implemented on different platforms.

object-detection Object Detection +1

Deep-Learning-Based Aerial Image Classification for Emergency Response Applications Using Unmanned Aerial Vehicles

1 code implementation20 Jun 2019 Christos Kyrkou, Theocharis Theocharides

Unmanned Aerial Vehicles (UAVs), equipped with camera sensors can facilitate enhanced situational awareness for many emergency response and disaster management applications since they are capable of operating in remote and difficult to access areas.

Aerial Scene Classification General Classification +3

DroNet: Efficient convolutional neural network detector for real-time UAV applications

2 code implementations18 Jul 2018 Christos Kyrkou, George Plastiras, Stylianos Venieris, Theocharis Theocharides, Christos-Savvas Bouganis

Through the analysis we propose a CNN architecture that is capable of detecting vehicles from aerial UAV images and can operate between 5-18 frames-per-second for a variety of platforms with an overall accuracy of ~95%.

Object Detection In Aerial Images One-Shot Object Detection +1

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