{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,26]],"date-time":"2026-02-26T15:25:47Z","timestamp":1772119547046,"version":"3.50.1"},"reference-count":74,"publisher":"MDPI AG","issue":"5","license":[{"start":{"date-parts":[[2024,2,29]],"date-time":"2024-02-29T00:00:00Z","timestamp":1709164800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100013348","name":"Innosuisse","doi-asserted-by":"publisher","award":["47195.1 IP-LS"],"award-info":[{"award-number":["47195.1 IP-LS"]}],"id":[{"id":"10.13039\/501100013348","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Optical 3D scanning applications are increasingly used in various medical fields. Setups involving multiple adjustable systems require repeated extrinsic calibration between patients. Existing calibration solutions are either not applicable to the medical field or require a time-consuming process with multiple captures and target poses. Here, we present an application with a 3D checkerboard (3Dcb) for extrinsic calibration with a single capture. The 3Dcb application can register captures with a reference to validate measurement quality. Furthermore, it can register captures from camera pairs for point-cloud stitching of static and dynamic scenes. Registering static captures from TIDA-00254 to its reference from a Photoneo MotionCam-3D resulted in an error (root mean square error \u00b1 standard deviation) of 0.02 mm \u00b1 2.9 mm. Registering a pair of Photoneo MotionCam-3D cameras for dynamic captures resulted in an error of 2.2 mm \u00b1 1.4 mm. These results show that our 3Dcb implementation provides registration for static and dynamic captures that is sufficiently accurate for clinical use. The implementation is also robust and can be used with cameras with comparatively low accuracy. In addition, we provide an extended overview of extrinsic calibration approaches and the application\u2019s code for completeness and service to fellow researchers.<\/jats:p>","DOI":"10.3390\/s24051575","type":"journal-article","created":{"date-parts":[[2024,2,29]],"date-time":"2024-02-29T05:59:19Z","timestamp":1709186359000},"page":"1575","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Extrinsic Calibration for a Modular 3D Scanning Quality Validation Platform with a 3D Checkerboard"],"prefix":"10.3390","volume":"24","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-8763-5003","authenticated-orcid":false,"given":"Mirko","family":"Kaiser","sequence":"first","affiliation":[{"name":"Biomedical Engineering Lab, Bern University of Applied Sciences, 2502 Biel, Switzerland"},{"name":"Laboratory for Movement Biomechanics, ETH Zurich, 8092 Z\u00fcrich, Switzerland"}]},{"given":"Tobia","family":"Brusa","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Lab, Bern University of Applied Sciences, 2502 Biel, Switzerland"}]},{"given":"Martin","family":"Bertsch","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Lab, Bern University of Applied Sciences, 2502 Biel, Switzerland"},{"name":"Laboratory for Movement Biomechanics, ETH Zurich, 8092 Z\u00fcrich, Switzerland"}]},{"given":"Marco","family":"Wyss","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Lab, Bern University of Applied Sciences, 2502 Biel, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0525-2197","authenticated-orcid":false,"given":"Sa\u0161a","family":"\u0106ukovi\u0107","sequence":"additional","affiliation":[{"name":"Laboratory for Movement Biomechanics, ETH Zurich, 8092 Z\u00fcrich, Switzerland"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9550-7418","authenticated-orcid":false,"given":"Gerrit","family":"Meixner","sequence":"additional","affiliation":[{"name":"Usability and Interaction Technology Lab, Heilbronn University, 74081 Heilbronn, Germany"}]},{"given":"Volker M.","family":"Koch","sequence":"additional","affiliation":[{"name":"Biomedical Engineering Lab, Bern University of Applied Sciences, 2502 Biel, Switzerland"}]}],"member":"1968","published-online":{"date-parts":[[2024,2,29]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"526","DOI":"10.1007\/s00586-018-05876-0","article-title":"Is rasterstereography a valid noninvasive method for the screening of juvenile and adolescent idiopathic scoliosis?","volume":"28","author":"Bassani","year":"2019","journal-title":"Eur. 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