{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,10]],"date-time":"2026-02-10T16:30:33Z","timestamp":1770741033825,"version":"3.49.0"},"reference-count":47,"publisher":"MDPI AG","issue":"1","license":[{"start":{"date-parts":[[2018,1,5]],"date-time":"2018-01-05T00:00:00Z","timestamp":1515110400000},"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>Free range systems can improve the welfare of laying hens. However, the access to environmental resources can be partially limited by social interactions, feeding of hens, and productivity, can be not stable and damaging behaviors, or negative events, can be observed more frequently than in conventional housing systems. In order to reach a real improvement of the hens\u2019 welfare the study of their laying performances and behaviors is necessary. With this purpose, many systems have been developed. However, most of them do not detect a multiple occupation of the nest negatively affecting the accuracy of data collected. To overcome this issue, a new \u201cnest-usage-sensor\u201d was developed and tested. It was based on the evaluation of thermografic images, as acquired by a thermo-camera, and the performing of patter recognitions on images acquired from the nest interior. The sensor was setup with a \u201cMultiple Nest Occupation Threshold\u201d of 796 colored pixels and a template of triangular shape and sizes of 43 \u00d7 33 pixels (high per base). It was tested through an experimental nesting system where 10 hens were reared for a month. Results showed that the evaluation of thermografic images could increase the detection performance of a multiple occupation of the nest and to apply an image pattern recognition technique could allow for counting the number of hens in the nest in case of a multiple occupation. As a consequence, the accuracy of data collected in studies on laying performances and behaviors of hens, reared in a free-range housing system, could result to be improved.<\/jats:p>","DOI":"10.3390\/s18010132","type":"journal-article","created":{"date-parts":[[2018,1,8]],"date-time":"2018-01-08T04:21:21Z","timestamp":1515385281000},"page":"132","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":19,"title":["Development of a Machine Vision Method for the Monitoring of Laying Hens and Detection of Multiple Nest Occupations"],"prefix":"10.3390","volume":"18","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8800-1777","authenticated-orcid":false,"given":"Mauro","family":"Zaninelli","sequence":"first","affiliation":[{"name":"Department of Human Sciences and Quality of Life Promotion, Universit\u00e0 Telematica San Raffaele Roma, Via di Val Cannuta 247, 00166 Rome, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6884-112X","authenticated-orcid":false,"given":"Veronica","family":"Redaelli","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]},{"given":"Fabio","family":"Luzi","sequence":"additional","affiliation":[{"name":"Department of Veterinary Medicine, Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]},{"given":"Malcolm","family":"Mitchell","sequence":"additional","affiliation":[{"name":"Animal &amp; Veterinary Sciences, Scotland\u2019s Rural College, Roslin Institute Building, Easter Bush, Midlothian, Edinburgh EH9 3JG, Scotland, UK"}]},{"given":"Valentino","family":"Bontempo","sequence":"additional","affiliation":[{"name":"Department of Health, Animal Science and Food Safety (VESPA), Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5439-1583","authenticated-orcid":false,"given":"Donata","family":"Cattaneo","sequence":"additional","affiliation":[{"name":"Department of Health, Animal Science and Food Safety (VESPA), Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]},{"given":"Vittorio","family":"Dell\u2019Orto","sequence":"additional","affiliation":[{"name":"Department of Health, Animal Science and Food Safety (VESPA), Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]},{"given":"Giovanni","family":"Savoini","sequence":"additional","affiliation":[{"name":"Department of Health, Animal Science and Food Safety (VESPA), Universit\u00e0 degli Studi di Milano, Via Celoria 10, 20133 Milan, Italy"}]}],"member":"1968","published-online":{"date-parts":[[2018,1,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Rodenburg, T.B., De Reu, K., and Tuyttens, F.A.M. 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