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Firstly, the linear migration model was replaced by a hyperbolic cotangent model which was closer to the natural law. And, the local search strategy was added to traditional BBO algorithm migration operation to enhance the global search ability of the algorithm. Then, the nonuniform variation was introduced to enhance the algorithm in the later iteration. The algorithm could achieve a stronger iris classifier by lifting weaker similarity classifiers during the training stage. On this base, the convergence condition of NBBO was proposed by using the Markov chain strategy. Finally, simulation results were given to demonstrate the effectiveness and efficiency of the proposed iris classification method.<\/jats:p>","DOI":"10.1155\/2021\/6694695","type":"journal-article","created":{"date-parts":[[2021,4,15]],"date-time":"2021-04-15T23:59:35Z","timestamp":1618531175000},"update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["A Novel BBO Algorithm Based on Local Search and Nonuniform Variation for Iris Classification"],"prefix":"10.1155","volume":"2021","author":[{"ORCID":"https:\/\/orcid.org\/0000-0003-1935-2260","authenticated-orcid":false,"given":"Lisheng","family":"Wei","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6684-0887","authenticated-orcid":false,"given":"Ning","family":"Wang","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7203-5809","authenticated-orcid":false,"given":"Huacai","family":"Lu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"311","published-online":{"date-parts":[[2021,4,15]]},"reference":[{"key":"e_1_2_8_1_2","doi-asserted-by":"publisher","DOI":"10.1109\/tsmcb.2007.904831"},{"key":"e_1_2_8_2_2","doi-asserted-by":"publisher","DOI":"10.3993\/jfbim00114"},{"key":"e_1_2_8_3_2","first-page":"1783","article-title":"A human identification technique using images of the iris and wavelet transform","volume":"36","author":"Boles W. 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