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Imaging"],"abstract":"<jats:p>This paper is an investigation in the field of personalized image quality assessment with the focus of studying individual contrast preferences for natural images. To achieve this objective, we conducted an in-lab experiment with 22 observers who assessed 499 natural images and collected their contrast level preferences. We used a three-alternative forced choice comparison approach coupled with a modified adaptive staircase algorithm to dynamically adjust the contrast for each new triplet. Through cluster analysis, we clustered observers into three groups based on their preferred contrast ranges: low contrast, natural contrast, and high contrast. This finding demonstrates the existence of individual variations in contrast preferences among observers. To facilitate further research in the field of personalized image quality assessment, we have created a database containing 10,978 original contrast level values preferred by observers, which is publicly available online.<\/jats:p>","DOI":"10.3390\/jimaging10010025","type":"journal-article","created":{"date-parts":[[2024,1,18]],"date-time":"2024-01-18T03:50:56Z","timestamp":1705549856000},"page":"25","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Individual Contrast Preferences in Natural Images"],"prefix":"10.3390","volume":"10","author":[{"given":"Olga","family":"Cherepkova","sequence":"first","affiliation":[{"name":"Department of Computer Science, Norwegian University of Science and Technology, 2802 Gj\u00f8vik, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Seyed Ali","family":"Amirshahi","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Norwegian University of Science and Technology, 2802 Gj\u00f8vik, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9797-5821","authenticated-orcid":false,"given":"Marius","family":"Pedersen","sequence":"additional","affiliation":[{"name":"Department of Computer Science, Norwegian University of Science and Technology, 2802 Gj\u00f8vik, Norway"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2024,1,18]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Cherepkova, O., Amirshahi, S.A., and Pedersen, M. 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