{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,11,8]],"date-time":"2025-11-08T13:34:35Z","timestamp":1762608875065,"version":"build-2065373602"},"reference-count":29,"publisher":"MDPI AG","issue":"16","license":[{"start":{"date-parts":[[2022,8,17]],"date-time":"2022-08-17T00:00:00Z","timestamp":1660694400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100007129","name":"Natural Science Foundation of Shandong Province","doi-asserted-by":"publisher","award":["ZR201911090294"],"award-info":[{"award-number":["ZR201911090294"]}],"id":[{"id":"10.13039\/501100007129","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Sky cloud detection has a significant application value in the meteorological field. The existing cloud detection methods mainly rely on the color difference between the sky background and the cloud layer in the sky image and are not reliable due to the variable and irregular characteristics of the cloud layer and different weather conditions. This paper proposes a cloud detection method based on all-sky polarization imaging. The core of the algorithm is the \u201cnormalized polarization degree difference index\u201d (NPDDI). Instead of relying on the color difference information, this index identifies the difference between degree of polarization (DoPs) of the cloud sky and the clear sky radiation to achieve cloud recognition. The method is not only fast and straightforward in the algorithm, but also can detect the optical thickness of the cloud layer in a qualitative sense. The experimental results show a good cloud detection performance.<\/jats:p>","DOI":"10.3390\/s22166162","type":"journal-article","created":{"date-parts":[[2022,8,17]],"date-time":"2022-08-17T22:53:30Z","timestamp":1660776810000},"page":"6162","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Cloud Detection Method Based on All-Sky Polarization Imaging"],"prefix":"10.3390","volume":"22","author":[{"given":"Wunan","family":"Li","sequence":"first","affiliation":[{"name":"College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China"},{"name":"School of Mathematics and Physics, Qingdao University of Science & Technology, Qingdao 266061, China"},{"name":"State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Changsha 410073, China"},{"name":"Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China"}]},{"given":"Yu","family":"Cao","sequence":"additional","affiliation":[{"name":"School of Mathematics and Physics, Qingdao University of Science & Technology, Qingdao 266061, China"}]},{"given":"Wenjing","family":"Zhang","sequence":"additional","affiliation":[{"name":"College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China"},{"name":"State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Changsha 410073, China"},{"name":"Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China"}]},{"given":"Yu","family":"Ning","sequence":"additional","affiliation":[{"name":"College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China"},{"name":"State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Changsha 410073, China"},{"name":"Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China"}]},{"given":"Xiaojun","family":"Xu","sequence":"additional","affiliation":[{"name":"College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China"},{"name":"State Key Laboratory of Pulsed Power Laser Technology, National University of Defense Technology, Changsha 410073, China"},{"name":"Hunan Provincial Key Laboratory of High Energy Laser Technology, National University of Defense Technology, Changsha 410073, China"}]}],"member":"1968","published-online":{"date-parts":[[2022,8,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"1543","DOI":"10.1002\/joc.1055","article-title":"Changes in spring\u2013summer cirrus cloud amount over Estonia, 1958\u20132003","volume":"24","author":"Eerme","year":"2004","journal-title":"Int. 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