4 June 2001 Optical characterization and calibration of gastroscope
Author Affiliations +
Proceedings Volume 4254, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems III; (2001); doi: 10.1117/12.427940
Event: BiOS 2001 The International Symposium on Biomedical Optics, 2001, San Jose, CA, United States
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.
© (2001) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Chuang-Jan Chang, Jyh-Jong Wei, Hong-Jueng King, Gwo-Jen Jan, "Optical characterization and calibration of gastroscope", Proc. SPIE 4254, Biomedical Diagnostic, Guidance, and Surgical-Assist Systems III, (4 June 2001); doi: 10.1117/12.427940; https://doi.org/10.1117/12.427940





Image analysis

CCD cameras

Detection and tracking algorithms

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