Sandra Manuela Gonçalves Dixe

Mrs. Sandra Manuela Gonçalves Dixe


Research Focus & Metrics

Academic Career Length

6Years (2021-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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31 December 2021 in Sensors
Verified
Journal Article
Open access
PDF file
CMCésar Gonçalo Macedo Melo
César Gonçalo Macedo Melo
SDSandra Manuela Gonçalves Dixe
Sandra Manuela Gonçalves Dixe
JFJaime Francisco Cruz Fonseca
Jaime Francisco Cruz Fonseca
António MoreiraAntónio Moreira
António Moreira
JBJoão Borges
João Borges
COVID-19 was responsible for devastating social, economic, and political effects all over the world. Although the health authorities imposed restrictions provided relief and assisted with trying to return society to normal life, it is imperative to monitor people’s behavior and risk factors to keep virus transmission levels as low as possible. This article focuses on the application of deep learning algorithms to detect the presence of masks on people in public spaces (using RGB cameras), as well as the detection of the caruncle in the human eye area to make an accurate measurement of body temperature (using thermal cameras). For this task, synthetic data generation techniques were used to create hybrid datasets from public ones to train state-of-the-art algorithms, such as YOLOv5 object detector and a keypoint detector based on Resnet-50. For RGB mask detection, YOLOv5 achieved an average precision of 82.4%. For thermal masks, glasses, and caruncle detection, YOLOv5 and keypoint detector achieved an average precision of 96.65% and 78.7%, respectively. Moreover, RGB and thermal datasets were made publicly available.

3 June 2021
Verified
Book Chapter
Closed access
PDF file
PFPedro Filipe Pires Faria
Pedro Filipe Pires Faria
SDSandra Manuela Gonçalves Dixe
Sandra Manuela Gonçalves Dixe
JLJoão Leite
João Leite
SASahar Azadi
Sahar Azadi
JMJosé Mendes
José Mendes
JBJoão Borges
João Borges

3 September 2025
Verified
Conference Paper
Closed access
CLCátia Loureiro
Cátia Loureiro
SDSandra Manuela Gonçalves Dixe
Sandra Manuela Gonçalves Dixe
HBHugo Baptista
Hugo Baptista
CNCristiana Neto
Cristiana Neto
TATiago Aston
Tiago Aston
Duarte FernandesDuarte Fernandes
Duarte Fernandes

3 September 2025
Verified
Conference Paper
Closed access
SDSandra Manuela Gonçalves Dixe
Sandra Manuela Gonçalves Dixe
CLCátia Loureiro
Cátia Loureiro
BMBeatriz Miranda
Beatriz Miranda
DFDiana Ferreira
Diana Ferreira
TATiago Aston
Tiago Aston
HPHugo Peixoto
Hugo Peixoto

30 June 2025 in Computers and Informatics
Verified
Journal Article
Open access
PDF file
SASahar Azadi
Sahar Azadi
SDSandra Manuela Gonçalves Dixe
Sandra Manuela Gonçalves Dixe
JLJoao Leite
Joao Leite
JBJoão Borges
João Borges
Sandro QueirósSandro Queirós
Sandro Queirós
JFJaime Francisco Cruz Fonseca
Jaime Francisco Cruz Fonseca
Deep learning-based methodologies are a key component towards the goal of autonomous driving. For a successful application, these models require a significant amount of training data, which is difficult, time-consuming, and expensive to collect. This study assesses the effectiveness of Generative Adversarial Networks (GANs) in generating high-quality training images for in-vehicle applications using a limited dataset. Two advanced GAN architectures were compared for their ability to produce realistic in-vehicle RGB images. The results showed that the StyleGAN-ADA outperformed the MSG-GAN, generating images with better fidelity and accuracy, making it more suitable for scenarios with limited data. However, challenges such as mode collapse and long training times, particularly for high-resolution images, were identified. The models’ reliance on the quality and diversity of the training dataset also limits their effectiveness in real-world applications. This research highlights the potential of GANs to reduce the lack of data in autonomous driving, pointing to future approaches for optimizing these models.