{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T03:19:46Z","timestamp":1760239186819,"version":"build-2065373602"},"reference-count":38,"publisher":"MDPI AG","issue":"20","license":[{"start":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T00:00:00Z","timestamp":1603152000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100012166","name":"National Key Research and Development Program of China","doi-asserted-by":"publisher","award":["2016YFC0802303"],"award-info":[{"award-number":["2016YFC0802303"]}],"id":[{"id":"10.13039\/501100012166","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["52005513"],"award-info":[{"award-number":["52005513"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100012226","name":"Fundamental Research Funds for the Central Universities","doi-asserted-by":"publisher","award":["27RA2003015"],"award-info":[{"award-number":["27RA2003015"]}],"id":[{"id":"10.13039\/501100012226","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Lens distortion is closely related to the spatial position of depth of field (DoF), especially in close-range photography. The accurate characterization and precise calibration of DoF-dependent distortion are very important to improve the accuracy of close-range vision measurements. In this paper, to meet the need of short-distance and small-focal-length photography, a DoF-dependent and equal-partition based lens distortion modeling and calibration method is proposed. Firstly, considering the direction along the optical axis, a DoF-dependent yet focusing-state-independent distortion model is proposed. By this method, manual adjustment of the focus and zoom rings is avoided, thus eliminating human errors. Secondly, considering the direction perpendicular to the optical axis, to solve the problem of insufficient distortion representations caused by using only one set of coefficients, a 2D-to-3D equal-increment partitioning method for lens distortion is proposed. Accurate characterization of DoF-dependent distortion is thus realized by fusing the distortion partitioning method and the DoF distortion model. Lastly, a calibration control field is designed. After extracting line segments within a partition, the de-coupling calibration of distortion parameters and other camera model parameters is realized. Experiment results shows that the maximum\/average projection and angular reconstruction errors of equal-increment partition based DoF distortion model are 0.11 pixels\/0.05 pixels and 0.013\u00b0\/0.011\u00b0, respectively. This demonstrates the validity of the lens distortion model and calibration method proposed in this paper.<\/jats:p>","DOI":"10.3390\/s20205934","type":"journal-article","created":{"date-parts":[[2020,10,20]],"date-time":"2020-10-20T20:50:07Z","timestamp":1603227007000},"page":"5934","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":5,"title":["DoF-Dependent and Equal-Partition Based Lens Distortion Modeling and Calibration Method for Close-Range Photogrammetry"],"prefix":"10.3390","volume":"20","author":[{"given":"Xiao","family":"Li","sequence":"first","affiliation":[{"name":"School of Mechanical and Electrical Engineering, China University of Petroleum (East China), Huangdao, Qingdao 266580, China"}]},{"given":"Wei","family":"Li","sequence":"additional","affiliation":[{"name":"School of Mechanical and Electrical Engineering, China University of Petroleum (East China), Huangdao, Qingdao 266580, China"}]},{"given":"Xin\u2019an","family":"Yuan","sequence":"additional","affiliation":[{"name":"School of Mechanical and Electrical Engineering, China University of Petroleum (East China), Huangdao, Qingdao 266580, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3247-8730","authenticated-orcid":false,"given":"Xiaokang","family":"Yin","sequence":"additional","affiliation":[{"name":"School of Mechanical and Electrical Engineering, China University of Petroleum (East China), Huangdao, Qingdao 266580, China"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9325-6384","authenticated-orcid":false,"given":"Xin","family":"Ma","sequence":"additional","affiliation":[{"name":"Polytechnic Institute, Purdue University, West Lafayette, IN 47907, USA"}]}],"member":"1968","published-online":{"date-parts":[[2020,10,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"381","DOI":"10.14358\/PERS.79.4.381","article-title":"Automatic camera calibration in close range photogrammetry","volume":"79","author":"Fraser","year":"2013","journal-title":"Photogramm. 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