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Retrospective color shading correction for endoscopic images

: Weiherer, M.; Zorn, M.; Wittenberg, T.; Palm, C.


Tolxdorff, T.:
Bildverarbeitung für die Medizin 2020 : Algorithmen - Systeme - Anwendungen. Proceedings des Workshops vom 15. bis 17. März 2020 in Berlin
Wiesbaden: Springer Fachmedien, 2020 (Informatik aktuell)
ISBN: 978-3-658-29266-9 (Print)
ISBN: 978-3-658-29267-6 (Online)
Workshop Bildverarbeitung für die Medizin (BVM) <2020, Berlin>
Conference Paper
Fraunhofer IIS ()

In this paper, we address the problem of retrospective color shading correction. An extension of the established gray-level shading correction algorithm based on signal envelope (SE) estimation to color images is developed using principal color components. Compared to the probably most general shading correction algorithm based on entropy minimization, SE estimation does not need any computationally expensive optimization and thus can be implemented more effciently. We tested our new shading correction scheme on artificial as well as real endoscopic images and observed promising results. Additionally, an indepth analysis of the stop criterion used in the SE estimation algorithm is provided leading to the conclusion that a fixed, user-defined threshold is generally not feasible. Thus, we present new ideas how to develop a non-parametric version of the SE estimation algorithm using entropy.