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Article

ResNet-Locust-BN Network-Based Automatic Identification of East Asian Migratory Locust Species and Instars from RGB Images

by 1,2,*, 3,*, 4 and 4
1
State Key Laboratory of Earth Surface Processes and Resource Ecology, Beijing Normal University, Beijing 100875, China
2
Center for Geodata and Analysis, Beijing Normal University, Beijing 100875, China
3
Master of Health Informatics, School of Information, University of Michigan, Ann Arbor, MI 48109, USA
4
Key Laboratory of Agricultural Land Quality (Beijing) Ministry of Land and Resources, China Agricultural University, Beijing 100083, China
*
Authors to whom correspondence should be addressed.
Insects 2020, 11(8), 458; https://doi.org/10.3390/insects11080458
Received: 13 May 2020 / Revised: 25 June 2020 / Accepted: 17 July 2020 / Published: 22 July 2020
(This article belongs to the Special Issue Locusts and Grasshoppers: Biology, Ecology and Management)
Locusts are agricultural pests found in many parts of the world. Developing efficient and accurate locust information acquisition techniques helps in understanding the relation between locust distribution density and structural changes in locust communities. It also helps in understanding the hydrothermal and vegetation growth conditions that affect locusts in their habitats in various parts of the world as well as in providing rapid and accurate warnings on locust plague outbreak. This study is a preliminary attempt to explore whether the batch normalization-based convolutional neural network (CNN) model can be applied used to perform automatic classification of East Asian migratory locust (AM locust), Oxya chinensis (rice locusts), and cotton locusts. In this paper, we present a way of applying the CNN technique to identify species and instars of locusts using the proposed ResNet-Locust-BN model. This model is based on the ResNet architecture and involves introduction of a BatchNorm function before each convolution layer to improve the network’s stability, convergence speed, and classification accuracy. Subsequently, locust image data collected in the field were used as input to train the model. By performing comparison experiments of the activation function, initial learning rate, and batch size, we selected ReLU as the preferred activation function. The initial learning rate and batch size were set to 0.1 and 32, respectively. Experiments performed to evaluate the accuracy of the proposed ResNet-Locust-BN model show that the model can effectively distinguish AM locust from rice locusts (93.60% accuracy) and cotton locusts (97.80% accuracy). The model also performed well in identifying the growth status information of AM locusts (third-instar (77.20% accuracy), fifth-instar (88.40% accuracy), and adult (93.80% accuracy)) with an overall accuracy of 90.16%. This is higher than the accuracy scores obtained by using other typical models: AlexNet (73.68%), GoogLeNet (69.12%), ResNet 18 (67.60%), ResNet 50 (80.84%), and VggNet (81.70%). Further, the model has good robustness and fast convergence rate. View Full-Text
Keywords: locust; grasshopper; monitoring and forecasting; image processing; deep learning; CNN locust; grasshopper; monitoring and forecasting; image processing; deep learning; CNN
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MDPI and ACS Style

Ye, S.; Lu, S.; Bai, X.; Gu, J. ResNet-Locust-BN Network-Based Automatic Identification of East Asian Migratory Locust Species and Instars from RGB Images. Insects 2020, 11, 458. https://doi.org/10.3390/insects11080458

AMA Style

Ye S, Lu S, Bai X, Gu J. ResNet-Locust-BN Network-Based Automatic Identification of East Asian Migratory Locust Species and Instars from RGB Images. Insects. 2020; 11(8):458. https://doi.org/10.3390/insects11080458

Chicago/Turabian Style

Ye, Sijing, Shuhan Lu, Xuesong Bai, and Jinfeng Gu. 2020. "ResNet-Locust-BN Network-Based Automatic Identification of East Asian Migratory Locust Species and Instars from RGB Images" Insects 11, no. 8: 458. https://doi.org/10.3390/insects11080458

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