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Nonlinear distortion correction in endoscopic video images

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4 Author(s)
Chao Zhang ; Dept. of Electr. Eng., Pennsylvania State Univ., University Park, PA, USA ; Helferty, J.P. ; Mclennan, G. ; Higgins, W.E.

Modern video-based endoscopes offer physicians a wide-angle held of view for minimally-invasive procedures. Unfortunately, inherent barrel distortion prevents accurate perception of range. This makes measurement and distance judgment difficult and causes difficulties in emerging applications, such as 3D medical-image registration. Such distortion also arises in other wide field-of-view camera circumstances. This paper presents a distortion-correction technique that can automatically calculate correction parameters, without precise knowledge of horizontal and vertical-orientation. The method is applicable to any camera-distortion correction situation. Based on a least-squares estimation, our proposed algorithm considers line fits in both field-of-view directions and global consistency that gives the optimal image center and expansion coefficients. The method is insensitive to the initial orientation of the endoscope and provides more exhaustive field-of-view correction than previously proposed algorithms. The distortion-correction procedure is demonstrated for endoscopic video images of a calibration test pattern, a rubber bronchial training device, and real human circumstances. The distortion correction is also shown as a necessary component of an image-guided virtual-endoscopy system that matches endoscope images to corresponding rendered 3D CT views.

Published in:

Image Processing, 2000. Proceedings. 2000 International Conference on  (Volume:2 )

Date of Conference:

10-13 Sept. 2000