RESEARCH PAPER
An Explainable AI Ensemble Model for Acquired Vitelliform Lesion Identification
 
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1
Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Poland
 
2
Faculty of Medicine, Chair and Department of General and Pediatric Ophthalmology, Medical University of Lublin, Poland
 
3
Institute of Biomedical Engineering, Faculty of Mechanical Engineering, Bialystok University of Technology Bialystok, Poland
 
These authors had equal contribution to this work
 
 
Submission date: 2026-04-07
 
 
Final revision date: 2026-06-13
 
 
Acceptance date: 2026-06-13
 
 
Publication date: 2026-08-14
 
 
Corresponding author
Paweł POWROŹNIK   

Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Nadbystrzycka 38D, 20-618, Lublin, Poland
 
 
Acta Mechanica et Automatica 2026;20(3):594-605
 
HIGHLIGHTS
  • Gathering the dataset providing OCT imaging of AVL, Drusen, and healthy cases
  • Employing the Deep CNN-GRU, CNN GRU U-Net , RAN to AVL identification
  • Applying the Grad-CAM to visualize the most relevant image areas for models
  • Employing ensemble learning techniques to provide the most effective model
  • Comparing the proposed models with the state-of-the-art
KEYWORDS
TOPICS
ABSTRACT
Retinal diseases gradually weaken eyesight and may even potentially lead to blindness. Recognizing changes in the retina based on OCT imag-ing allows for the detection of diseases at their early stages and thus for making an appropriate diagnosis. In this study, acquired vitelliform le-sions (AVL), drusen, and healthy cases are identified utilizing various CNN-based architectures, such as the Convolutional Gated Recurrent Units U-Net, Deep CNN-GRU Network, Residual Attention CNN. The dataset consisting of OCT images was created using photographs gathered from two research centres and publicly available OCT database. The single models obtained to be very effective in recog-nition the retinal diseases, obtaining the accuracy of 93.80%, 94.03%, and 95.18% for the Convolutional Gated Recurrent Units U-Net, Deep CNN-GRU Network, Residual Attention CNN, respectively. These models outperformed the pre-trained deep learning architectures, VGG-16, ResNet-18, InceptionV3, and DenseNet-121. In order to further enhance the performance of AVL, drusen, and normal cases identification up to 97.09% accuracy, bagging, boosting, and stacking of ensemble learning methods for all models are applied. Moreover, in or-der to eliminate the black box effect and indicate on what basis the classifier makes conclusions, two interpretability techniques are employed: Gradient Weighted Class Activation Maps (Grad-CAM) and Shap values. This study gives the in-depth insight into AVL, Drusen, and normal cases identification. Moreover, it provides the most effective CNN-based architecture with high accuracy to support ophthalmologists.
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