Deep learning for multi-label classification of coral conditions in the Indo-Pacific via underwater photogrammetry

• URL: http://arxiv.org/abs/2403.05930v2
• Date: Tue, 12 Mar 2024 14:15:50 GMT
• Title: Deep learning for multi-label classification of coral conditions in the Indo-Pacific via underwater photogrammetry
• Authors: Xinlei Shao and Hongruixuan Chen and Kirsty Magson and Jiaqi Wang and Jian Song and Jundong Chen and Jun Sasaki
• Abstract summary: This study created a dataset representing common coral conditions and associated stressors in the Indo-Pacific. It assessed existing classification algorithms and proposed a new multi-label method for automatically detecting coral conditions and extracting ecological information. The proposed method accurately classified coral conditions as healthy, compromised, dead, and rubble.
• Score: 24.00646413446011
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Since coral reef ecosystems face threats from human activities and climate change, coral conservation programs are implemented worldwide. Monitoring coral health provides references for guiding conservation activities. However, current labor-intensive methods result in a backlog of unsorted images, highlighting the need for automated classification. Few studies have simultaneously utilized accurate annotations along with updated algorithms and datasets. This study aimed to create a dataset representing common coral conditions and associated stressors in the Indo-Pacific. Concurrently, it assessed existing classification algorithms and proposed a new multi-label method for automatically detecting coral conditions and extracting ecological information. A dataset containing over 20,000 high-resolution coral images of different health conditions and stressors was constructed based on the field survey. Seven representative deep learning architectures were tested on this dataset, and their performance was quantitatively evaluated using the F1 metric and the match ratio. Based on this evaluation, a new method utilizing the ensemble learning approach was proposed. The proposed method accurately classified coral conditions as healthy, compromised, dead, and rubble; it also identified corresponding stressors, including competition, disease, predation, and physical issues. This method can help develop the coral image archive, guide conservation activities, and provide references for decision-making for reef managers and conservationists. The proposed ensemble learning approach outperforms others on the dataset, showing State-Of-The-Art (SOTA) performance. Future research should improve its generalizability and accuracy to support global coral conservation efforts.

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