6 documents found, page 1 of 1
Sunspot Detection Using YOLOv5 in Spectroheliograph H-Alpha Images
Santos, José; Peixinho, Nuno; Barata, Teresa; Pereira, Carlos; Coimbra, A. Paulo; Crisóstomo, Manuel M.; Mendes, MateusSolar activity has been subject to increasingly more research in the last decades. Its influence on life on Earth is now better understood. Solar winds impact the earth’s magnetic field and atmosphere. They can disrupt satellite communication and navigation tools and even electrical power grids and several other infrastructure crucial for our technology-based society. Coronal mass ejections (CMEs), solar energe...
Forest Vegetation Detection Using Deep Learning Object Detection Models
Mendes, Paulo A. S.; Coimbra, A. Paulo; Almeida, Aníbal T. deForest fires have become increasingly prevalent and devastating in many regions worldwide, posing significant threats to biodiversity, ecosystems, human settlements, and the economy. The United States (USA) and Portugal are two countries that have experienced recurrent forest fires, raising concerns about the role of forest fuel and vegetation accumulation as contributing factors. One preventive measure which c...
Non-Destructive Fast Estimation of Tree Stem Height and Volume Using Image Proc...
Coelho, João; Fidalgo, Beatriz; Crisóstomo, Manuel M.; Salas-González, Raúl; Coimbra, A. Paulo; Mendes, MateusMeasuring biometric tree characteristics to estimate the volume of wood in a forest area is a time consuming task. It is usually performed by a team of two or more people, who measure the diameter and height of several trees in sampling plots. The results are then extrapolated for the forest stand. The present paper describes a method which facilitates estimating tree biometric parameters using computational te...
Autonomous System for Wildfire and Forest Fire Early Detection and Control
Ferreira, Luís Miguel; Coimbra, A. Paulo; Almeida, Aníbal T. deRecurring and increasing large-scale wildfires across the globe (e.g., Southern Europe, California, Australia), as a result of worsening climate conditions with record temperatures, drought, and strong winds, present a challenge to mankind. Early fire detection is crucial for a quick reaction and e ective firefighting operations, minimizing the risk to human lives as well as the destruction of assets, infrastru...
Treadmill and Vision System for Human Gait Acquisition and Analysis
Ferreira, Paulo A.; Ferreira, João P.; Crisóstomo, Manuel; Coimbra, A. PauloThis paper presents a developed low cost system for human gait analysis. Two web cameras placed in opposite sides of a treadmill are used to acquire images of a person walking at different speeds on a treadmill, carrying a set of passive marks located at strategic places of its body. The treadmill also has passive marks with the color chosen to contrast with the ambient dominant color. The body joint angle traj...
Tuning a PD Controller Based on an SVR for the Control of a Biped Robot Subject...
Ferreira, João P.; Crisóstomo, Manuel Marques; Coimbra, A. PauloReal-time balance control of an eight-link biped robot using a zero moment point (ZMP) dynamic model is difficult to achieve due to the processing time of the corresponding equations. To overcome this limitation an intelligent computing technique based on Support Vector Regression (SVR) is developed and presented in this paper. To implement a PD controller the SVR uses the ZMP error relative to a reference and ...