Abstract
Endoscopic images are strongly affected by lens distortion caused by the use of wide angle lenses. In case of endoscopy systems with exchangeable optics, e.g. in bladder endoscopy or sinus endoscopy, the camera sensor and the optics do not form a rigid system but they can be shifted and rotated with respect to each other during an examination. This flexibility has a major impact on the location of the distortion centre as it is moved along with the optics. In this paper, we describe an algorithm for the dynamic correction of lens distortion in cystoscopy which is based on a one time calibration. For the compensation, we combine a conventional static method for distortion correction with an algorithm to detect the position and the orientation of the elliptic field of view. This enables us to estimate the position of the distortion centre according to the relative movement of camera and optics. Therewith, a distortion correction for arbitrary rotation angles and shifts becomes possible without performing static calibrations for every possible combination of shifts and angles beforehand.
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References
Konen W, Breiderhoff B, Scholz M. Real-time image mosaic for endoscopic video sequences. Proc BVM. 2007; p. 298–302.
Behrens A. Creating panoramic images for bladder fluorescence endoscopy. Acta Polytech: J Adv Eng. 2008;3:50–54.
Stehle T, Truhn D, Aach T, et al. Camera calibration for fish-eye lenses in endoscopy with an application to 3D reconstruction. Procs IEEE ISBI. 2007 April; p. 1176–1179.
Kannala J, Brandt SS. A generic camera model and calibration method for conventional, wide-angle, and fish-eye lenses. IEEE Trans PAMI. 2006;28(8):1335–1340.
Hartley R, Kang SB. Parameter-free radial distortion correction with center of distortion estimation. IEEE Trans PAMI. 2007;29(8): 1309–1321.
Mühlich M, Aach T. High accuracy feature detection for camera calibration: A multi-steerable approach. LNCS. 2007;(4713):284–293.
Stäche NC, Zimmer H, Gedicke J, et al. Robust high-speed melt pool measurements for laser welding with sputter detection capability. LNCS. 2007;4713:476–485.
Fischler MA, Bolles RC. Random sample consensus: A paradigm for model fitting with applications to image analysis and automated cartography. Commun ACM. 1981 June;24(6):381–395.
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© 2009 Springer-Verlag Berlin Heidelberg
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Stehle, T., Hennes, M., Gross, S., Behrens, A., Wulff, J., Aach, T. (2009). Dynamic Distortion Correction for Endoscopy Systems with Exchangeable Optics. In: Meinzer, HP., Deserno, T.M., Handels, H., Tolxdorff, T. (eds) Bildverarbeitung für die Medizin 2009. Informatik aktuell. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-540-93860-6_29
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DOI: https://doi.org/10.1007/978-3-540-93860-6_29
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-540-93859-0
Online ISBN: 978-3-540-93860-6
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