{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,28]],"date-time":"2026-07-28T13:51:50Z","timestamp":1785246710973,"version":"3.55.0"},"reference-count":34,"publisher":"MDPI AG","issue":"6","license":[{"start":{"date-parts":[[2024,6,17]],"date-time":"2024-06-17T00:00:00Z","timestamp":1718582400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"JSPS KAKENHI","award":["JP19H04196"],"award-info":[{"award-number":["JP19H04196"]}]},{"name":"JSPS KAKENHI","award":["JP21K11954"],"award-info":[{"award-number":["JP21K11954"]}]},{"name":"Institute for Global Prominent Research, Chiba University, Japan","award":["JP19H04196"],"award-info":[{"award-number":["JP19H04196"]}]},{"name":"Institute for Global Prominent Research, Chiba University, Japan","award":["JP21K11954"],"award-info":[{"award-number":["JP21K11954"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Imaging"],"abstract":"<jats:p>Gloss is associated significantly with material appearance, and observers often focus on gloss unevenness. Gloss unevenness is the intensity distribution of reflected light observed within a highlight area, that is, the variability. However, it cannot be analyzed easily because it exists only within the highlight area and varies in appearance across the reflection angles. In recent years, gloss has been analyzed in terms of the intensity of specular reflection and its angular spread, or the bidirectional reflectance distribution function (BRDF). In this study, we develop an apparatus to measure gloss unevenness that can alter the angle with an angular resolution of 0.02\u00b0. Additionally, we analyze the gloss unevenness and BRDF in terms of specular reflection. Using a high angular resolution, we measure and analyze high-gloss materials, such as mirrors and plastics, and glossy materials, such as photo-like inkjet paper and coated paper. Our results show that the magnitude of gloss unevenness is the largest at angles marginally off the center of the specular reflection angle. We discuss an approach for physically defining gloss unevenness based on the BRDF.<\/jats:p>","DOI":"10.3390\/jimaging10060146","type":"journal-article","created":{"date-parts":[[2024,6,17]],"date-time":"2024-06-17T04:48:12Z","timestamp":1718599692000},"page":"146","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":7,"title":["Analysis of Gloss Unevenness and Bidirectional Reflectance Distribution Function in Specular Reflection"],"prefix":"10.3390","volume":"10","author":[{"given":"So","family":"Nakamura","sequence":"first","affiliation":[{"name":"Department of Imaging Sciences, Graduate School of Science and Engineering, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Shinichi","family":"Inoue","sequence":"additional","affiliation":[{"name":"Faculty of Engineering, Tokyo Polytechnic University, 1583 Iiyama, Atsugi 243-0297, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yoshinori","family":"Igarashi","sequence":"additional","affiliation":[{"name":"Chuo Precision Industrial Co., Ltd., 65 Shirasaka Miwadai, Shirakawa 961-0835, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9228-1203","authenticated-orcid":false,"given":"Hiromi","family":"Sato","sequence":"additional","affiliation":[{"name":"Graduate School of Informatics, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7678-5463","authenticated-orcid":false,"given":"Yoko","family":"Mizokami","sequence":"additional","affiliation":[{"name":"Graduate School of Informatics, Chiba University, 1-33 Yayoi-cho, Inage-ku, Chiba 263-8522, Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2024,6,17]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1038\/nature05724","article-title":"Image statistics and the perception of surface qualities","volume":"447","author":"Motoyoshi","year":"2007","journal-title":"Nature"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"10","DOI":"10.1167\/9.11.10","article-title":"Image statistics do not explain the perception of gloss and lightness","volume":"9","author":"Anderson","year":"2009","journal-title":"J. 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