Cited by 26Remote-Sensing Image ClassificationAdvanced Neural Network ApplicationsAquatic Ecosystems and Phytoplankton Dynamics

Semantic segmentation based on Deep learning for the detection of Cyanobacterial Harmful Algal Blooms (CyanoHABs) using synthetic images

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Barrientos-Espillco, Fredy, Gascó, Esther, López-González, Clara I., Gómez-Silva, María J., Pajares, Gonzalo·2023·Applied Soft Computing

Abstract

Cyanobacterial Harmful Algal Blooms (CyanoHABs) in lakes and reservoirs have increased substantially in recent decades due to different environmental factors. Its early detection is a crucial issue to minimize health effects, particularly in potential drinking and recreational water bodies. The use of Autonomous Surface Vehicles (ASVs) equipped with machine vision systems (cameras) onboard, represents a useful alternative at this time. In this regard, we propose an image Semantic Segmentation approach based on Deep Learning with Convolutional Neural Networks (CNNs) for the early detection of CyanoHABs considering an ASV perspective. The use of these models is justified by the fact that with their convolutional architecture, it is possible to capture both, spectral and textural information considering the context of a pixel and its neighbors. To train these models it is necessary to have data, but the acquisition of real images is a difficult task, due to the capricious appearance of the algae on water surfaces sporadically and intermittently over time and after long periods of time, requiring even years and the permanent installation of the image capture system. This justifies the generation of synthetic data so that sufficiently trained models are required to detect CyanoHABs patches when they emerge on the water surface. The data generation for training and the use of the semantic segmentation models to capture contextual information determine the need for the proposal, as well as its novelty and contribution. Three datasets of images containing CyanoHABs patches are generated: (a) the first contains real patches of CyanoHABs as foreground and images of lakes and reservoirs as background, but with a limited number of examples; (b) the second, contains synthetic patches of CyanoHABs generated with state-of-the-art Style-based Generative Adversarial Network Adaptive Discriminator Augmentation (StyleGAN2-ADA) and Neural Style Transfer as foreground and images of lakes and reservoirs as background, and (c) the third set, is the combination of the previous two. Four model architectures for semantic segmentation (UNet++, FPN, PSPNet, and DeepLabV3+), with two encoders as backbone (ResNet50 and EfficientNet-b6), are evaluated from each dataset on real test images and different distributions. The results show the feasibility of the approach and that the UNet++ model with EfficientNet-b6, trained on the third dataset, achieves good generalization and performance for the real test images.

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Crossref · 10.1016/j.asoc.2023.110315

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Authors
Barrientos-Espillco, F., Gascó, E., López-González, C. I., Gómez-Silva, M. J., & Pajares, G.
Affiliations
Universidad Complutense de Madrid (ES)
Corresponding author
Barrientos-Espillco, Fredy
Venue
Applied Soft Computing
Publisher
Elsevier BV
Published
2023-07
Volume
141
Pages
110315
ISSN
1568-4946 (ISSN-L)
OpenAlex
W4366256777
Cited by
26
References
47
Citations by year
2026: 2 · 2025: 8 · 2024: 14 · 2023: 2
FWCI
2.87
Type
journal article
Language
en
Open access
Locations
Applied Soft Computing (publishedVersion, cc-by)
Funders
  • Comunidad de Madrid (Y2020/TCS-6420)
  • Ministerio de Ciencia, Innovación y Universidades (RTI2018-098962-BC21)
Topics
  • Physical Sciences › Engineering › Media Technology › Remote-Sensing Image Classification
  • Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
  • Physical Sciences › Environmental Science › Environmental Chemistry › Aquatic Ecosystems and Phytoplankton Dynamics
Keywords
cyanobacterial harmful algal blooms, semantic segmentation, unmanned surface vehicles, synthetic image generation, StyleGAN2-ADA, neural style transfer, convolutional neural networks, U-Net

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