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Proceedings Paper

Optical characterization and calibration of gastroscope
Author(s): Chuang-Jan Chang; Jyh-Jong Wei; Hong-Jueng King; Gwo-Jen Jan
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Paper Abstract

Endoscopy is a versatile medical device, but with deficiency of severe image distortion from a super-wide angle lens CCD- camera installed. We designed a planar circular pattern target mounted on a XYZ transnational stage and developed a calibration method to correct the distorted image. Through the image shaping similarity and symmetric properties of a circular pad posing in the specific spatial coordinates, an optimized algorithm is to adjust the orientation of the gastroscopic head and the coordinates of the target until the accurate system alignment obtained. The profiles of image mapping and the calibration object are to derive both the image distortion and calibration function as single variable polynomial equations. Using the calibration function, the distorted gastroscopic image could transfer to comply with an ideal pinhole mapping. The experimental results validated that a gastroscopic image could be corrected and depict better geometrical information. Concurrently displaying with the traditional screen, this technique could aid the physician in metering a tumor or lesion size.

Paper Details

Date Published: 4 June 2001
PDF: 8 pages
Proc. SPIE 4254, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems III, (4 June 2001); doi: 10.1117/12.427940
Show Author Affiliations
Chuang-Jan Chang, National Taiwan Univ. (Taiwan)
Jyh-Jong Wei, National Taiwan Univ. (Taiwan)
Hong-Jueng King, Chung-Shang Institute of Science and Technology (Taiwan)
Gwo-Jen Jan, National Taiwan Univ. (Taiwan)


Published in SPIE Proceedings Vol. 4254:
Biomedical Diagnostic, Guidance, and Surgical-Assist Systems III
Tuan Vo-Dinh; Warren S. Grundfest; David A. Benaron, Editor(s)

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