{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,4]],"date-time":"2026-03-04T17:45:09Z","timestamp":1772646309402,"version":"3.50.1"},"reference-count":25,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2021,10,15]],"date-time":"2021-10-15T00:00:00Z","timestamp":1634256000000},"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>Visible and infrared reflectance imaging spectroscopy is one of the several non-invasive techniques used during Operation Night Watch for the study of Rembrandt\u2019s iconic masterpiece The Night Watch (1642). The goals of this project include the identification and mapping of the artists\u2019 materials, providing information about the painting technique used as well as documenting the painting\u2019s current state and ultimately determining the possible conservation plan. The large size of the painting (3.78 m by 4.53 m) and the diversity of the technical investigations being performed make Operation Night Watch the largest research project ever undertaken at the Rijksmuseum. To construct a complete reflectance image cube at a high spatial resolution (168 \u00b5m2) and spectral resolution (2.54 to 6 nm), the painting was imaged with two high-sensitivity line scanning hyperspectral cameras (VNIR 400 to 1000 nm, 2.54 nm, and SWIR 900 to 2500 nm, 6 nm). Given the large size of the painting, a custom computer-controlled 3-D imaging frame was constructed to move each camera, along with lights, across the painting surface. A third axis, normal to the painting, was added along with a distance-sensing system which kept the cameras in focus during the scanning. A total of 200 hyperspectral image swaths were collected, mosaicked and registered to a high-resolution color image to sub-pixel accuracy using a novel registration algorithm. The preliminary analysis of the VNIR and SWIR reflectance images has identified many of the pigments used and their distribution across the painting. The SWIR, in particular, has provided an improved visualization of the preparatory sketches and changes in the painted composition. These data sets, when combined with the results from the other spectral imaging modalities and paint sample analyses, will provide the most complete understanding of the materials and painting techniques used by Rembrandt in The Night Watch.<\/jats:p>","DOI":"10.3390\/s21206855","type":"journal-article","created":{"date-parts":[[2021,10,17]],"date-time":"2021-10-17T23:25:15Z","timestamp":1634513115000},"page":"6855","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":25,"title":["Reflectance Imaging Spectroscopy (RIS) for Operation Night Watch: Challenges and Achievements of Imaging Rembrandt\u2019s Masterpiece in the Glass Chamber at the Rijksmuseum"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7510-8719","authenticated-orcid":false,"given":"Francesca","family":"Gabrieli","sequence":"first","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"}]},{"given":"John K.","family":"Delaney","sequence":"additional","affiliation":[{"name":"Scientific Research Department, National Gallery of Art, 6th and Constitution Avenue NW, Washington, DC 20565, USA"}]},{"given":"Robert G.","family":"Erdmann","sequence":"additional","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"},{"name":"Conservation and Restoration, University of Amsterdam, Johannes Vermeerplein 1, 1071 DV Amsterdam, The Netherlands"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3243-7664","authenticated-orcid":false,"given":"Victor","family":"Gonzalez","sequence":"additional","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"}]},{"given":"Annelies","family":"van Loon","sequence":"additional","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"},{"name":"Paintings Conservation Department, Mauritshuis, Plein 29, 2511 CS The Hague, The Netherlands"}]},{"given":"Patrick","family":"Smulders","sequence":"additional","affiliation":[{"name":"TBRM Engineering Solutions (Former Segula Technologies), De Witbogt 2, 5652 AG Eindhoven, The Netherlands"}]},{"given":"Roy","family":"Berkeveld","sequence":"additional","affiliation":[{"name":"TBRM Engineering Solutions (Former Segula Technologies), De Witbogt 2, 5652 AG Eindhoven, The Netherlands"}]},{"given":"Robert","family":"van Langh","sequence":"additional","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"}]},{"given":"Katrien","family":"Keune","sequence":"additional","affiliation":[{"name":"Conservation and Science Department, Rijksmuseum, Hobbemastraat 22, 1017 ZC Amsterdam, The Netherlands"},{"name":"Van\u2019t Hoff Institute for Molecular Sciences, University of Amsterdam, Science Park 904, 1090 GD Amsterdam, The Netherlands"}]}],"member":"1968","published-online":{"date-parts":[[2021,10,15]]},"reference":[{"key":"ref_1","first-page":"117","article-title":"The Art of Conservation III: The Restorations of Rembrandt\u2019s \u2018Night Watch\u2019","volume":"158","author":"Duijn","year":"2016","journal-title":"Burlingt. 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