Details
| Original language | English |
|---|---|
| Title of host publication | Nonlinear Optics and Applications XII |
| Editors | Mario Bertolotti, Anatoly V. Zayats, Alexei M. Zheltikov |
| Publisher | SPIE |
| ISBN (electronic) | 9781510643741 |
| Publication status | Published - 18 Apr 2021 |
| Event | Nonlinear Optics and Applications XII 2021 - Virtual, Online, Czech Republic Duration: 19 Apr 2021 → 23 Apr 2021 |
Publication series
| Name | Proceedings of SPIE - The International Society for Optical Engineering |
|---|---|
| Volume | 11770 |
| ISSN (Print) | 0277-786X |
| ISSN (electronic) | 1996-756X |
Abstract
Benefiting from recent innovations in the smartphone sector, liquid optics in very compact designs have been cost-effectively introduced to the market. Without mechanical actuation, a focus variation can be adjusted within fractions of a second by curving a boundary layer between two liquids by applying a pulse width or amplitude modulated potential. Especially in the field of endoscopy, these innovative optical components open up many application possibilities. Conventional, mechanical zoom lenses are not very common in endoscopy and can only be miniaturized at considerable effort due to the necessary actuation and the complex design. In addition, the mechanical response is slow, which is a particular disadvantage in hand-held operation. A calibrated camera provides a two-dimensional camera pixel translated into a three-dimensional beam and, together with distortion correction enables the extraction of metric information. This approach is widely used in endoscopy, for example, to measure objects in the scene or to estimate the camera position and derive a trajectory accordingly. This is particularly important for triangulation-based 3D reconstruction such as photogrammetry. The use of liquid lenses requires a new data set with an adapted camera calibration for each focus adjustment. In practice, this is not feasible and would result in an extensive calibration effort. This paper therefore examines, on the basis of an experimental setup for automated endoscopic camera calibration, the extent to which certain calibration parameters can be modelled and approximated for each possible focal adjustment, and also investigates the inuence of a liquid lens on the quality of the actual calibration.
Keywords
- Camera calibration, Endoscopy, Liquid lens, Metrology
ASJC Scopus subject areas
- Materials Science(all)
- Electronic, Optical and Magnetic Materials
- Physics and Astronomy(all)
- Condensed Matter Physics
- Computer Science(all)
- Computer Science Applications
- Mathematics(all)
- Applied Mathematics
- Engineering(all)
- Electrical and Electronic Engineering
Cite this
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- BibTeX
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Nonlinear Optics and Applications XII. ed. / Mario Bertolotti; Anatoly V. Zayats; Alexei M. Zheltikov. SPIE, 2021. 1177014 (Proceedings of SPIE - The International Society for Optical Engineering; Vol. 11770).
Research output: Chapter in book/report/conference proceeding › Conference contribution › Research › peer review
}
TY - GEN
T1 - Adaptive camera calibration for a focus adjustable liquid lens in fiber optic endoscopy
AU - Hinz, Lennart
AU - Kästner, Markus
AU - Reithmeier, Eduard
N1 - Funding Information: The authors would like to thank the German Research Foundation (DFG) for funding the project B6 Endoscopic geometry inspection within the Collaborative Research Center (CRC) / TR 73.
PY - 2021/4/18
Y1 - 2021/4/18
N2 - Benefiting from recent innovations in the smartphone sector, liquid optics in very compact designs have been cost-effectively introduced to the market. Without mechanical actuation, a focus variation can be adjusted within fractions of a second by curving a boundary layer between two liquids by applying a pulse width or amplitude modulated potential. Especially in the field of endoscopy, these innovative optical components open up many application possibilities. Conventional, mechanical zoom lenses are not very common in endoscopy and can only be miniaturized at considerable effort due to the necessary actuation and the complex design. In addition, the mechanical response is slow, which is a particular disadvantage in hand-held operation. A calibrated camera provides a two-dimensional camera pixel translated into a three-dimensional beam and, together with distortion correction enables the extraction of metric information. This approach is widely used in endoscopy, for example, to measure objects in the scene or to estimate the camera position and derive a trajectory accordingly. This is particularly important for triangulation-based 3D reconstruction such as photogrammetry. The use of liquid lenses requires a new data set with an adapted camera calibration for each focus adjustment. In practice, this is not feasible and would result in an extensive calibration effort. This paper therefore examines, on the basis of an experimental setup for automated endoscopic camera calibration, the extent to which certain calibration parameters can be modelled and approximated for each possible focal adjustment, and also investigates the inuence of a liquid lens on the quality of the actual calibration.
AB - Benefiting from recent innovations in the smartphone sector, liquid optics in very compact designs have been cost-effectively introduced to the market. Without mechanical actuation, a focus variation can be adjusted within fractions of a second by curving a boundary layer between two liquids by applying a pulse width or amplitude modulated potential. Especially in the field of endoscopy, these innovative optical components open up many application possibilities. Conventional, mechanical zoom lenses are not very common in endoscopy and can only be miniaturized at considerable effort due to the necessary actuation and the complex design. In addition, the mechanical response is slow, which is a particular disadvantage in hand-held operation. A calibrated camera provides a two-dimensional camera pixel translated into a three-dimensional beam and, together with distortion correction enables the extraction of metric information. This approach is widely used in endoscopy, for example, to measure objects in the scene or to estimate the camera position and derive a trajectory accordingly. This is particularly important for triangulation-based 3D reconstruction such as photogrammetry. The use of liquid lenses requires a new data set with an adapted camera calibration for each focus adjustment. In practice, this is not feasible and would result in an extensive calibration effort. This paper therefore examines, on the basis of an experimental setup for automated endoscopic camera calibration, the extent to which certain calibration parameters can be modelled and approximated for each possible focal adjustment, and also investigates the inuence of a liquid lens on the quality of the actual calibration.
KW - Camera calibration
KW - Endoscopy
KW - Liquid lens
KW - Metrology
UR - http://www.scopus.com/inward/record.url?scp=85109211914&partnerID=8YFLogxK
U2 - 10.1117/12.2592653
DO - 10.1117/12.2592653
M3 - Conference contribution
AN - SCOPUS:85109211914
T3 - Proceedings of SPIE - The International Society for Optical Engineering
BT - Nonlinear Optics and Applications XII
A2 - Bertolotti, Mario
A2 - Zayats, Anatoly V.
A2 - Zheltikov, Alexei M.
PB - SPIE
T2 - Nonlinear Optics and Applications XII 2021
Y2 - 19 April 2021 through 23 April 2021
ER -