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In order to get a clear image that contains all relevant objects in an area, the multi-focus image fusion algorithm is proposed based on wavelet transform. Firstly, the multi-focus images were decomposed by wavelet transform. Secondly, the wavelet coefficients of the approximant and detail sub-images are fused respectively based on the fusion rule. Finally, the fused image was obtained by using the inverse wavelet transform. Among them, for the low-frequency and high-frequency coefficients, we present a fusion rule based on the weighted ratios and the weighted gradient with the improved edge detection operator. The experimental results illustrate that the proposed algorithm is effective for retaining the detailed images.<\/jats:p>","DOI":"10.1515\/jisys-2017-0078","type":"journal-article","created":{"date-parts":[[2017,8,21]],"date-time":"2017-08-21T09:12:36Z","timestamp":1503306756000},"page":"505-516","source":"Crossref","is-referenced-by-count":2,"title":["Fusion Algorithm of Multi-focus Images with Weighted Ratios and Weighted Gradient Based on Wavelet Transform"],"prefix":"10.1515","volume":"28","author":[{"given":"Wei-bin","family":"Chen","sequence":"first","affiliation":[{"name":"College of Physics and Electronic Information Engineering , Wenzhou University , Wenzhou, Zhejiang , China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mingxiao","family":"Hu","sequence":"additional","affiliation":[{"name":"College of Physics and Electronic Information Engineering , Wenzhou University , Wenzhou, Zhejiang , China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Lai","family":"Zhou","sequence":"additional","affiliation":[{"name":"Shanghai Electro-Mechanical Engineering Institute, Shanghai Academy of Spaceflight Technology , Shanghai , China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hongbin","family":"Gu","sequence":"additional","affiliation":[{"name":"College of Civil Aviation , Nanjing University of Aeronautics and Astronautics , Nanjing 210016 , China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xin","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Biomedical Engineering , Wenzhou Medical University , Wenzhou, Zhejiang , China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"374","published-online":{"date-parts":[[2017,8,19]]},"reference":[{"key":"2025120523324335452_j_jisys-2017-0078_ref_001_w2aab3b7b3b1b6b1ab1b6b1Aa","doi-asserted-by":"crossref","unstructured":"X. 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