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This study proposed a new unsupervised application of SAR images that can recognize the change type of the area. First, a regionally restricted principal component analysis k-mean (RRPCA-Kmean) clustering algorithm, combining principal component analysis, k-mean clustering, and mathematical morphology composition, was designed to obtain pre-classification results in combination with change type vectors. Second, a lightweight MobileNet was designed based on the results of the first stage to perform the reclassification of the pre-classification results and obtain the change recognition results of the changed regions. The experimental results using SAR datasets with different resolutions show that the method can guarantee change recognition results with good change detection correctness.<\/jats:p>","DOI":"10.3390\/rs14246362","type":"journal-article","created":{"date-parts":[[2022,12,16]],"date-time":"2022-12-16T02:54:02Z","timestamp":1671159242000},"page":"6362","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Unsupervised SAR Image Change Type Recognition Using Regionally Restricted PCA-Kmean and Lightweight MobileNet"],"prefix":"10.3390","volume":"14","author":[{"given":"Wei","family":"Liu","sequence":"first","affiliation":[{"name":"College of Data and Target Engineering, Information Engineering University, Zhengzhou 450000, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8867-172X","authenticated-orcid":false,"given":"Zhikang","family":"Lin","sequence":"additional","affiliation":[{"name":"College of Data and Target Engineering, Information Engineering University, Zhengzhou 450000, China"}]},{"given":"Gui","family":"Gao","sequence":"additional","affiliation":[{"name":"The Faculty of Geosciences and Environmental Engineering, Southwest Jiaotong University, Chengdu 611756, China"}]},{"given":"Chaoyang","family":"Niu","sequence":"additional","affiliation":[{"name":"College of Data and Target Engineering, Information Engineering University, Zhengzhou 450000, China"}]},{"given":"Wanjie","family":"Lu","sequence":"additional","affiliation":[{"name":"College of Data and Target Engineering, Information Engineering University, Zhengzhou 450000, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,12,15]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Chunga, K., Livio, F.A., Martillo, C., Lara-Saavedra, H., Ferrario, M.F., Zevallos, I., and Michetti, A.M. 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