Practical zoom camera calibration method for close-range photogrammetry

Autor:	Zhen Zhang, Jiehu Kang, Luyuan Feng, Zefeng Sun, Bin Wu
Rok vydání:	2023
Předmět:	Atomic and Molecular Physics and Optics
Zdroj:	Optics Letters. 48:243
ISSN:	1539-4794 0146-9592
DOI:	10.1364/ol.478758
Popis:	Compared to a conventional fixed focus lens, a zoom lens is more flexible and adaptable. However, the challenges involved in precise calibration for a zoom camera prevent its widespread use in close-range photogrammetry. A practical calibration method for a zoom camera is proposed. The zoom-focus model is established through dimension reduction of the setting variables, which is represented as a set of functions of the zoom setting. The zoom and focus settings are updated in real time for objects at different measurement depths. The calibration process only requires the zoom camera to observe the control points distributed in the designed calibration field with several combinations of zoom and focus settings. All the coefficients of the zoom-focus model can be solved by a nonlinear joint optimization. Experimental results have proved that the proposed method is effective for close-range photogrammetry.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1ad0fcd79e94560b5f076e33b103eed3 https://doi.org/10.1364/ol.478758 Zobrazit plný text záznamu