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Proceedings Paper

Robust distortion correction of endoscope
Author(s): Wenjing Li; Sixiang Nie; Marcelo Soto-Thompson; Chao-I Chen; Yousif I. A-Rahim
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Paper Abstract

Endoscopic images suffer from a fundamental spatial distortion due to the wide angle design of the endoscope lens. This barrel-type distortion is an obstacle for subsequent Computer Aided Diagnosis (CAD) algorithms and should be corrected. Various methods and research models for the barrel-type distortion correction have been proposed and studied. For industrial applications, a stable, robust method with high accuracy is required to calibrate the different types of endoscopes in an easy of use way. The correction area shall be large enough to cover all the regions that the physicians need to see. In this paper, we present our endoscope distortion correction procedure which includes data acquisition, distortion center estimation, distortion coefficients calculation, and look-up table (LUT) generation. We investigate different polynomial models used for modeling the distortion and propose a new one which provides correction results with better visual quality. The method has been verified with four types of colonoscopes. The correction procedure is currently being applied on human subject data and the coefficients are being utilized in a subsequent 3D reconstruction project of colon.

Paper Details

Date Published: 17 March 2008
PDF: 8 pages
Proc. SPIE 6918, Medical Imaging 2008: Visualization, Image-Guided Procedures, and Modeling, 691812 (17 March 2008); doi: 10.1117/12.769243
Show Author Affiliations
Wenjing Li, STI Medical Systems (United States)
Sixiang Nie, STI Medical Systems (United States)
Marcelo Soto-Thompson, STI Medical Systems (United States)
Chao-I Chen, Univ. of California, Santa Barbara (United States)
Yousif I. A-Rahim, Univ. of Hawaii John A. Burns School of Medicine (United States)


Published in SPIE Proceedings Vol. 6918:
Medical Imaging 2008: Visualization, Image-Guided Procedures, and Modeling
Michael I. Miga; Kevin Robert Cleary, Editor(s)

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