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Dynamic Distortion Correction for Endoscopy Systems with Exchangeable Optics

Dynamic Distortion Correction for Endoscopy Systems with Exchangeable Optics,10.1007/978-3-540-93860-6_29,Thomas Stehle,Michael Hennes,Sebastian Gross

Dynamic Distortion Correction for Endoscopy Systems with Exchangeable Optics   (Citations: 2)
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Endoscopic images are strongly afiected 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 examina- tion. This ∞exibility 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 fleld 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 combi- nation of shifts and angles beforehand.
Conference: Bildverarbeitung fur die Medizin , pp. 142-146, 2009
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