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Using an image segmentation and support vector machine method for identifying two locust species and instars

Journal of Integrative Agriculture 2020年第5期19卷 1301-1313页

作者： Shuhan LU YE Si-jing Department of Computer and Information Science College of Art and ScienceOhio State UniversityColumbusOH 43210USA State Key Laboratory of Earth Surface Processes and Resource Ecology Beijing Normal UniversityBeijing 100875P.R.China Center for Geodata and Analysis Beijing Normal UniversityBeijing 100875P.R.China

Locusts are agricultural pests around the world. To cognize how locust distribution density and community structure are related to the hydrothermal and vegetation growth conditions of their habitats and thereby providing rapid and accurate warning of locust invasions, it is important to develop efficient and accurate techniques for acquiring locust information. In this paper, by analyzing the differences between the morphological features of Locusta migratoria manilensis and Oedaleus decorus asiaticus, we proposed a semi-automatic locust species and instar information detection model based on locust image segmentation, locust feature variable extraction and support vector machine(SVM) classification. And we subsequently examined its applicability and accuracy based on sample image data acquired in the field. Locust image segmentation experiment showed that the proposed GrabCut-based interactive segmentation method can be used to rapidly extract images of various locust body parts and exhibits excellent operability. In a locust feature variable extraction experiment, the textural, color and morphological features of various locust body parts were calculated. Based on the results, eight feature variables were selected to identify locust species and instars using outlier detection, variable function calculation and principal component analysis. An SVM-based locust classification experiment achieved a semi-automatic detection accuracy of 96.16% when a polynomial kernel function with a penalty factor parameter c of 2 040 and a gamma parameter g of 0.5 was used. The proposed detection model exhibits advantages such as high applicability and accuracy when it is used to identify locust instars of L. migratoria manilensis and O. decorus asiaticus, and it can also be used to identify other species of locusts.

关键词： locust identification machine learning support vector machine L.migratoria manilensis O.decorus asiaticus

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