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For this aim, firstly, images are transformed into multiscale space based on nonsubsampled shearlet transform (NSST). Secondly, principal components and weights of each subband are calculated. Averaging them yields weights necessary for fusion step. Finally, fused image is achieved by merging source images according to weights. Quantitative and qualitative analysis prove outperformance of our methods compared to well-known fusion methods and improvement compared to subsequent best method, in terms of standard deviation [Formula: see text], entropy [Formula: see text], structural similarity [Formula: see text], signal to noise ratio [Formula: see text] and fusion performance metric [Formula: see text].<\/jats:p>","DOI":"10.1142\/s0219691319500231","type":"journal-article","created":{"date-parts":[[2019,2,13]],"date-time":"2019-02-13T06:43:39Z","timestamp":1550040219000},"page":"1950023","source":"Crossref","is-referenced-by-count":5,"title":["Medical image fusion based on nonsubsampled shearlet transform and principal component averaging"],"prefix":"10.1142","volume":"17","author":[{"given":"Tannaz","family":"Akbarpour","sequence":"first","affiliation":[{"name":"Biomedical Engineering Faculty, Sahand University of Technology, Tabriz, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mousa","family":"Shamsi","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Faculty, Sahand University of Technology, Tabriz, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Sabalan","family":"Daneshvar","sequence":"additional","affiliation":[{"name":"Electrical and Computer Engineering Faculty, Tabriz University, Tabriz, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Masoud","family":"Pooreisa","sequence":"additional","affiliation":[{"name":"Faculty of Medicine, Tabriz University of Medical Science, Tabriz, Iran"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"219","published-online":{"date-parts":[[2019,7,2]]},"reference":[{"key":"S0219691319500231BIB001","doi-asserted-by":"publisher","DOI":"10.1109\/IranianCEE.2014.6999865"},{"issue":"12","key":"S0219691319500231BIB002","volume":"125","author":"Al-Azzawi N. 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