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The background residue in complex ground\u2013sky background images leads to high false alarm rates when traditional local contrast methods are used because of the complexity and variability of the ground\u2013sky background imaging environment. A weighted local ratio-difference contrast (WLRDC) method is proposed in this paper to address this problem and detect infrared small targets in the ground\u2013sky background. First, target candidate pixels are obtained using a simple facet kernel filter. Second, local contrast saliency maps and weighted mappings are calculated on the basis of the local ratio-difference contrast and the spatial dissimilarity of the target, respectively. Third, the final weighted mapping can be obtained through the multiplication fusion strategy. Finally, a simple threshold segmentation method is employed to extract the target. Experimental results on six real ground\u2013sky infrared scenes showed that the proposed method outperforms existing state-of-the-art methods.<\/jats:p>","DOI":"10.3390\/rs14225636","type":"journal-article","created":{"date-parts":[[2022,11,9]],"date-time":"2022-11-09T02:44:32Z","timestamp":1667961872000},"page":"5636","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Weighted Local Ratio-Difference Contrast Method for Detecting an Infrared Small Target against Ground\u2013Sky Background"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-7227-0857","authenticated-orcid":false,"given":"Hongguang","family":"Wei","sequence":"first","affiliation":[{"name":"School of Intelligent Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Pengge","family":"Ma","sequence":"additional","affiliation":[{"name":"School of Intelligent Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2934-1840","authenticated-orcid":false,"given":"Dongdong","family":"Pang","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Fractional Signals and Systems, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Li","sequence":"additional","affiliation":[{"name":"Beijing Key Laboratory of Fractional Signals and Systems, School of Information and Electronics, Beijing Institute of Technology, Beijing 100081, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jinwang","family":"Qian","sequence":"additional","affiliation":[{"name":"School of Intelligent Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xingchen","family":"Guo","sequence":"additional","affiliation":[{"name":"School of Intelligent Engineering, Zhengzhou University of Aeronautics, Zhengzhou 450015, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,11,8]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Zhang, T., Wu, H., Liu, Y., Peng, L., Yang, C., and Peng, Z. 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