A new method for distortion correction of electronic endoscope images

Author

Haneishi, Hideaki ; Yagihashi, Yutaka ; Miyake, Yoichi

Author_Institution

Dept. of Inf. & Comput. Sci., Chiba Univ., Japan

Volume

14

Issue

3

fYear

1995

fDate

9/1/1995 12:00:00 AM

Firstpage

548

Lastpage

555

Abstract

A new method to correct the barrel distortion of an electronic endoscope image is presented. A correction model assuming circularly symmetric distortion is introduced with the following model parameters: the center of distortion and the coefficients of polynomials representing the distortion correction in the radial direction. If the imaging system is distortion-free, straight lines in the object space should be imaged as straight lines. Based on this criterion, a distorted image of a standard pattern consisting of a grid of several straight lines is recorded, and the model parameters are then estimated as a basis for straightening distorted lines. This method has the advantage of not needing a careful placement of the standard pattern for calibration. Correction results are presented for the grid pattern chart to verify a sufficient degree of correction. Examples of distortion correction of real intestinal images and physicians´ comments are also presented

Keywords

biomedical electronics; medical image processing; modelling; barrel distortion; circularly symmetric distortion; correction model; distorted lines straightening; distortion center; distortion correction method; electronic endoscope images; grid pattern chart; intestinal images; medical diagnostic imaging; model parameters; physicians´ comments; polynomial coefficients; radial direction; Calibration; Charge-coupled image sensors; Endoscopes; Image analysis; Image texture analysis; Intestines; Optical fiber sensors; Parameter estimation; Polynomials; Surface topography;

fLanguage

English

Journal_Title

Medical Imaging, IEEE Transactions on

Publisher

ieee

ISSN

0278-0062

Type

jour

DOI

10.1109/42.414620

Filename

414620