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Tree-based Deep Convolutional Neural Network for Hierarchical Identification of Low-resolution Insect Images

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan www.asabe.org

Citation:  2021 ASABE Annual International Virtual Meeting  2100437.(doi:10.13031/aim.202100437)
Authors:   Dan Jeric Arcega Rustia, Ya-Fang Wu, Pei-Yu Shih, Sheng-Kuan Chen, Jui-Yung Chung, Ta-Te Lin
Keywords:   insect identification, convolutional neural network, deep learning, tree-based image classification, integrated pest management

Abstract. The inability to classify insects up to the species level is the current limitation of recently developed automated insect recognition algorithms. Yet, there are situations in integrated pest management (IPM) that call for more precise classification of insects. This research proposes an effective method for automated identification of low-resolution insect images found on sticky paper traps. Insect image samples were collected from sticky paper trap images that were acquired by wireless image sensor nodes installed in an outdoor mango orchard. A tree-based classifier, made up of taxonomically cascaded convolutional neural network (CNN) models, was used to automatically identify the insects on each sticky paper trap from coarse to fine taxonomic levels. The proposed tree-based classification method can classify the insect images up to an F1-score of 0.94, surpassing the performance of an optimized single multi-class image classifier model with an F1-score of 0.87. The proposed method not only boosts the classification performance, but also offers hierarchical predictions that can be used as easily interpretable information. In addition, model hyperparameter optimization, data augmentation, and classification probability threshold tuning can be applied at each level to optimize its performance. This research can be applied to support farmers in selecting IPM components, such as crop variants, pesticides, parasitoids, and more, in order to control the population of different insect species and prevent production loss.

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