{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,8]],"date-time":"2026-02-08T08:19:38Z","timestamp":1770538778371,"version":"3.49.0"},"reference-count":26,"publisher":"MDPI AG","issue":"7","license":[{"start":{"date-parts":[[2020,3,29]],"date-time":"2020-03-29T00:00:00Z","timestamp":1585440000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>This paper experimentally investigates passive human visible light sensing (VLS). A passive VLS system is tested consisting of one light emitting diode (LED) and one photodiode-based receiver, both ceiling-mounted. There is no line of sight between the LED and the receiver, so only reflected light can be considered. The influence of a human is investigated based on the received signal strength (RSS) values of the reflections of ambient light at the photodiode. Depending on the situation, this influence can reach up to     \u00b1 50 %    . The experimental results show the influence of three various clothing colors, four different walking directions and four different layouts. Based on the obtained results, a human pass-by detection system is proposed and tested. The system achieves a detection rate of 100% in a controlled environment for 21 experiments. For a realistic corridor experiment, the system keeps its detection rate of 100% for 19 experiments.<\/jats:p>","DOI":"10.3390\/s20071902","type":"journal-article","created":{"date-parts":[[2020,4,1]],"date-time":"2020-04-01T03:44:13Z","timestamp":1585712653000},"page":"1902","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Passive Visible Light Detection of Humans"],"prefix":"10.3390","volume":"20","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-1954-6738","authenticated-orcid":false,"given":"Kenneth","family":"Deprez","sequence":"first","affiliation":[{"name":"WAVES, Department of Information Technology (INTEC), Ghent University\/imec, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6797-6778","authenticated-orcid":false,"given":"Sander","family":"Bastiaens","sequence":"additional","affiliation":[{"name":"WAVES, Department of Information Technology (INTEC), Ghent University\/imec, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Luc","family":"Martens","sequence":"additional","affiliation":[{"name":"WAVES, Department of Information Technology (INTEC), Ghent University\/imec, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8807-0673","authenticated-orcid":false,"given":"Wout","family":"Joseph","sequence":"additional","affiliation":[{"name":"WAVES, Department of Information Technology (INTEC), Ghent University\/imec, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-8879-5076","authenticated-orcid":false,"given":"David","family":"Plets","sequence":"additional","affiliation":[{"name":"WAVES, Department of Information Technology (INTEC), Ghent University\/imec, Technologiepark-Zwijnaarde 126, B-9052 Ghent, Belgium"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2020,3,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"231","DOI":"10.1038\/sj.jea.7500165","article-title":"The National Human Activity Pattern Survey (NHAPS): A Resource for Assessing Exposure to Environmental Pollutants","volume":"11","author":"Klepeis","year":"2001","journal-title":"J. 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