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Shading correction for endoscopic images using principal color components

  • Tobias BergenEmail author
  • Thomas Wittenberg
  • Christian Münzenmayer
Original Article

Abstract

Purpose

Inhomogeneous illumination often causes significant shading and vignetting effects in images captured by an endoscope. Most of the established shading correction methods are designed for gray-level images. Only few papers have been published about how to compensate for shading in color images. For endoscopic images with a distinct red coloring, these methods tend to produce color artifacts.

Method

A color shading correction algorithm for endoscopic images is proposed. Principal component analysis is used to calculate an appropriate estimate of the shading effect so that a one-channel shading correction can be applied without producing undesired artifacts.

Results

The proposed method is compared to established YUV and HSV color-conversion-based approaches. It produces superior results both on simulated and on real endoscopic images. Example images of using the proposed shading correction for endoscopic image mosaicking are presented.

Conclusion

A new method for shading correction is presented which is tailored to images with distinct coloring. It is beneficial for the visual impression and further image analysis tasks.

Keywords

Color shading correction De-vignetting Principal component analysis Endoscopy Image stitching 

Notes

Compliance with ethical standards

Conflict of interest

Tobias Bergen, Thomas Wittenberg and Christian Münzenmayer declare that they have no conflict of interest.

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Copyright information

© CARS 2015

Authors and Affiliations

  • Tobias Bergen
    • 1
    Email author
  • Thomas Wittenberg
    • 1
  • Christian Münzenmayer
    • 1
  1. 1.Fraunhofer Institute for Integrated Circuits IISErlangenGermany

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