Journal
ICES JOURNAL OF MARINE SCIENCE
Volume 77, Issue 4, Pages 1295-1307Publisher
OXFORD UNIV PRESS
DOI: 10.1093/icesjms/fsz025
Keywords
deep learning; fish assemblage; fish detection; fisheries management; neural networks; stock assessment; underwater video
Categories
Funding
- Australian Research Council [LP110201008]
- German Academic Exchange Service (DAAD) [57243488]
- Australian Research Council [LP110201008] Funding Source: Australian Research Council
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It is interesting to develop effective fish sampling techniques using underwater videos and image processing to automatically estimate and consequently monitor the fish biomass and assemblage in water bodies. Such approaches should be robust against substantial variations in scenes due to poor luminosity, orientation of fish, seabed structures, movement of aquatic plants in the background and image diversity in the shape and texture among fish of different species. Keeping this challenge in mind, we propose a unified approach to detect freely moving fish in unconstrained underwater environments using a Region-Based Convolutional Neural Network, a state-of-the-art machine learning technique used to solve generic object detection and localization problems. To train the neural network, we employ a novel approach to utilize motion information of fish in videos via background subtraction and optical flow, and subsequently combine the outcomes with the raw image to generate fish-dependent candidate regions. We use two benchmark datasets extracted from a large Fish4Knowledge underwater video repository, Complex Scenes dataset and the LifeCLEF 2015 fish dataset to validate the effectiveness of our hybrid approach. We achieve a detection accuracy (F-Score) of 87.44% and 80.02% respectively on these datasets, which advocate the utilization of our approach for fish detection task.
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