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Fishes 2018, 3(3), 26; https://doi.org/10.3390/fishes3030026

Automatic Discrimination between Scomber japonicus and Scomber australasicus by Geometric and Texture Features

Graduate School of Engineering, Tohoku University, Aoba 6-6-05, Aramaki, Aoba-ku, Sendai 980-8579, Japan
Current address: Dai Nippon Printing Co., Ltd., 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo 162-8001, Japan.
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Received: 2 May 2018 / Revised: 21 June 2018 / Accepted: 21 June 2018 / Published: 27 June 2018
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Abstract

This paper proposes a method for automatic discrimination of two mackerel species: Scomber japonicus (chub mackerel) and Scomber australasicus (blue mackerel). Because S. japonicus has a much higher market price than S. australasicus, the two species must be properly sorted before shipment, but their similar appearance makes discrimination difficult. These species can be effectively distinguished using the ratio of the base length between the dorsal fin’s first and ninth spines to the fork length. However, manual measurement of this ratio is time-consuming and reduces fish freshness. The proposed technique instead uses image processing to measure these lengths. We were able to successfully discriminate between the two species using the ratio as a geometric feature, in combination with several texture features. We then quantitatively verified the effectiveness of the proposed method and demonstrated that it is highly accurate in classifying mackerel. View Full-Text
Keywords: Scomber japonicus; Scomber australasicus; fish discrimination; image processing; geometric feature; texture feature Scomber japonicus; Scomber australasicus; fish discrimination; image processing; geometric feature; texture feature
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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Kitasato, A.; Miyazaki, T.; Sugaya, Y.; Omachi, S. Automatic Discrimination between Scomber japonicus and Scomber australasicus by Geometric and Texture Features. Fishes 2018, 3, 26.

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