Detecting mammals in UAV images: best practices to address a substantially imbalanced dataset with deep learning
Open accessAbstract
Knowledge over the number of animals in large wildlife reserves is a vital necessity for park rangers in their efforts to protect endangered species. Manual animal censuses are dangerous and expensive, hence Unmanned Aerial Vehicles (UAVs) with consumer level digital cameras are becoming a popular alternative tool to estimate livestock. Several works have been proposed that semi-automatically process UAV images to detect animals, of which some employ Convolutional Neural Networks (CNNs), a recent family of deep learning algorithms that proved very effective in object detection in large datasets from computer vision. However, the majority of works related to wildlife focuses only on small datasets (typically subsets of UAV campaigns), which might be detrimental when presented with the sheer scale of real study areas for large mammal census. Methods may yield thousands of false alarms in such cases. In this paper, we study how to scale CNNs to large wildlife census tasks and present a number of recommendations to train a CNN on a large UAV dataset. We further introduce novel evaluation protocols that are tailored to censuses and model suitability for subsequent human verification of detections. Using our recommendations, we are able to train a CNN reducing the number of false positives by an order of magnitude compared to previous state-of-the-art. Setting the requirements at 90% recall, our CNN allows to reduce the amount of data required for manual verification by three times, thus making it possible for rangers to screen all the data acquired efficiently and to detect almost all animals in the reserve automatically.
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Kellenberger et al. (2018) used CNNs to detect mammals in UAV images.
“Kellenberger et al. (2018) even tried using CNNs to detect mammals in UAV images”
From Deep learning in remote sensing applications: A meta-analysis and review (2019) · cites this paper as Kellenberger et al. (2018)
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- Authors
- Kellenberger, B., Marcos, D., & Tuia, D.
- Affiliations
- Wageningen University & Research (NL)
- Corresponding author
- Kellenberger, Benjamin
- Venue
- Remote Sensing of Environment
- Publisher
- Elsevier BV
- Published
- 2018-10
- Volume
- 216
- Pages
- 139-153
- ISSN
- 0034-4257 (ISSN-L)
- OpenAlex
- W2810030371
- Cited by
- 335
- References
- 49
- Citations by year
- 2026: 39 · 2025: 35 · 2024: 44 · 2023: 53 · 2022: 40 · 2021: 53 · 2020: 37 · 2019: 34
- FWCI
- 15.51
- Type
- journal article
- Language
- en
- Open access
- green
- research.wur.nl
- Licence
- Locations
- Remote Sensing of Environment (publishedVersion)
- Socio-Environmental Systems Modeling (acceptedVersion, cc-by-nc-nd)
- arXiv (Cornell University) (submittedVersion)
- Data Archiving and Networked Services (DANS) (submittedVersion, cc-by-nc-nd)
- arXiv (Cornell University)
- Funders
- Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PZ00P2-136827)
- Topics
- Physical Sciences › Computer Science › Computer Vision and Pattern Recognition › Advanced Neural Network Applications
- Physical Sciences › Environmental Science › Ecology › Wildlife Ecology and Conservation
- Life Sciences › Agricultural and Biological Sciences › Plant Science › Smart Agriculture and AI
- Keywords
- mammal detection, unmanned aerial vehicles, wildlife census, class imbalance, convolutional neural networks, object detection, false positive reduction, evaluation protocol, human verification, large-scale image databases, wildlife reserves, livestock monitoring
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