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Express"],"published-print":{"date-parts":[[2026,6,29]]},"abstract":"<jats:p>Structured light systems based on a camera\u2013projector pair (CPP) are widely used for indoor 3D reconstruction, particularly in textureless environments where passive methods often fail. However, existing approaches typically rely on pre-calibrated intrinsics or multi-view self-calibration with known reference objects, which limits their applicability in practical indoor scenarios. Recovering CPP intrinsics from only two views without any known objects remains a challenging problem. In this paper, we present a simple yet reliable calibration framework that enables direct 3D reconstruction with an unknown CPP. By exploiting a commonly available indoor structure\u2014an unknown cuboid corner (C2) (e.g., a room corner), we show that sufficient geometric constraints can be obtained from only two views. With only the camera principal point known, the initially coupled multi-parameter estimation is reduced to a univariable optimization problem, resulting in stable and accurate intrinsic recovery. Extensive experiments demonstrate that our method consistently outperforms both traditional and learning-based alternatives in terms of robustness and reconstruction accuracy. Moreover, the framework can be naturally extended to passive settings without active illumination, showing promising potential for sparse-view structure-from-motion applications.<\/jats:p>","DOI":"10.1364\/oe.595617","type":"journal-article","created":{"date-parts":[[2026,6,16]],"date-time":"2026-06-16T12:00:10Z","timestamp":1781611210000},"page":"24745","update-policy":"https:\/\/doi.org\/10.1364\/crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Indoor 3D reconstruction using an unknown camera-projector pair"],"prefix":"10.1364","volume":"34","author":[{"ORCID":"https:\/\/orcid.org\/0009-0007-3004-7650","authenticated-orcid":true,"given":"Yang","family":"Zou","sequence":"first","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenyou","family":"Chang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yating","family":"Liu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yifeng","family":"Hao","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Rui","family":"Hu","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiaqi","family":"Yang","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3013-5099","authenticated-orcid":true,"given":"Zhaoshuai","family":"Qi","sequence":"additional","affiliation":[{"id":[{"id":"https:\/\/ror.org\/01y0j0j86","id-type":"ROR","asserted-by":"publisher"}]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"285","published-online":{"date-parts":[[2026,6,25]]},"reference":[{"key":"oe-34-13-24745-R2","first-page":"29835","type":"journal-article","volume":"34","author":"Zhang","year":"2021","journal-title":"Advances in Neural Information Processing Systems"},{"key":"oe-34-13-24745-R6","doi-asserted-by":"publisher","first-page":"1","DOI":"10.1561\/0600000052","type":"journal-article","volume":"9","author":"Furukawa","year":"2015","journal-title":"Foundations and Trends in Computer Graphics and Vision"},{"key":"oe-34-13-24745-R7","doi-asserted-by":"publisher","first-page":"261","DOI":"10.1109\/76.825726","type":"journal-article","volume":"10","author":"Eisert","year":"2000","journal-title":"IEEE Trans. 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