{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,17]],"date-time":"2026-04-17T16:45:01Z","timestamp":1776444301352,"version":"3.51.2"},"reference-count":38,"publisher":"MDPI AG","issue":"11","license":[{"start":{"date-parts":[[2023,6,3]],"date-time":"2023-06-03T00:00:00Z","timestamp":1685750400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Jiangsu Province key research and development plan","award":["BE2022385"],"award-info":[{"award-number":["BE2022385"]}]},{"name":"Jiangsu Province key research and development plan","award":["NJ2021-03"],"award-info":[{"award-number":["NJ2021-03"]}]},{"name":"Jiangsu Province key research and development plan","award":["202210307099Z"],"award-info":[{"award-number":["202210307099Z"]}]},{"name":"Jiangsu Modern Agricultural Machinery Equipment and Technology Demonstration and Promotion Project","award":["BE2022385"],"award-info":[{"award-number":["BE2022385"]}]},{"name":"Jiangsu Modern Agricultural Machinery Equipment and Technology Demonstration and Promotion Project","award":["NJ2021-03"],"award-info":[{"award-number":["NJ2021-03"]}]},{"name":"Jiangsu Modern Agricultural Machinery Equipment and Technology Demonstration and Promotion Project","award":["202210307099Z"],"award-info":[{"award-number":["202210307099Z"]}]},{"name":"Innovation and Entrepreneurship Training Program for College Students of Nanjing Agricultural University","award":["BE2022385"],"award-info":[{"award-number":["BE2022385"]}]},{"name":"Innovation and Entrepreneurship Training Program for College Students of Nanjing Agricultural University","award":["NJ2021-03"],"award-info":[{"award-number":["NJ2021-03"]}]},{"name":"Innovation and Entrepreneurship Training Program for College Students of Nanjing Agricultural University","award":["202210307099Z"],"award-info":[{"award-number":["202210307099Z"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>The prices of different quality river crabs on the market can vary several times. Therefore, the internal quality identification and accurate sorting of crabs are particularly important for improving the economic benefits of the industry. Using existing sorting methods by labor and weight to meet the urgent needs of mechanization and intelligence in the crab breeding industry is difficult. Therefore, this paper proposes an improved BP neural network model based on a genetic algorithm, which can grade the crab quality. We comprehensively considered the four characteristics of crabs as the input variables of the model, namely gender, fatness, weight, and shell color of crabs, among which gender, fatness, and shell color were obtained by image processing technology, whereas weight is obtained using a load cell. First, mature machine vision technology is used to preprocess the images of the crab\u2019s abdomen and back, and then feature information is extracted from the images. Next, genetic and backpropagation algorithms are combined to establish a quality grading model for crab, and data training is conducted on the model to obtain the optimal threshold and weight values. Analysis of experimental results reveals that the average classification accuracy reaches 92.7%, which proves that this method can achieve efficient and accurate classification and sorting of crabs, successfully addressing market demand.<\/jats:p>","DOI":"10.3390\/s23115317","type":"journal-article","created":{"date-parts":[[2023,6,5]],"date-time":"2023-06-05T02:18:29Z","timestamp":1685931509000},"page":"5317","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":18,"title":["Quality Grading of River Crabs Based on Machine Vision and GA-BPNN"],"prefix":"10.3390","volume":"23","author":[{"given":"Han","family":"Wang","sequence":"first","affiliation":[{"name":"College of Engineering, Nanjing Agricultural University, No. 40 Dianjiangtai Road, Pukou District, Nanjing 210031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hong","family":"Zhu","sequence":"additional","affiliation":[{"name":"Jiangsu Agricultural Machinery Development and Application Center, Nanjing 210017, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lishuai","family":"Bi","sequence":"additional","affiliation":[{"name":"College of Engineering, Nanjing Agricultural University, No. 40 Dianjiangtai Road, Pukou District, Nanjing 210031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wenjie","family":"Xu","sequence":"additional","affiliation":[{"name":"College of Economics and Management, Nanjing Agricultural University, Xiaoling Wei Street Weigang No.1, Xuanwu District, Nanjing 210095, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ning","family":"Song","sequence":"additional","affiliation":[{"name":"College of Engineering, Nanjing Agricultural University, No. 40 Dianjiangtai Road, Pukou District, Nanjing 210031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zhiqiang","family":"Zhou","sequence":"additional","affiliation":[{"name":"Kunshan Agricultural Machinery Promotion Station, Kunshan 215300, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lanying","family":"Ding","sequence":"additional","affiliation":[{"name":"College of Engineering, Nanjing Agricultural University, No. 40 Dianjiangtai Road, Pukou District, Nanjing 210031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5213-1035","authenticated-orcid":false,"given":"Maohua","family":"Xiao","sequence":"additional","affiliation":[{"name":"College of Engineering, Nanjing Agricultural University, No. 40 Dianjiangtai Road, Pukou District, Nanjing 210031, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,6,3]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"103472","DOI":"10.1016\/j.compind.2021.103472","article-title":"The quiet revolution in machine vision\u2014A state-of-the-art survey paper, including historical review, perspectives, and future directions","volume":"130","author":"Smith","year":"2021","journal-title":"Comput. 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