Retrospective Illumination Correction of Retinal Images
Joint Authors
Kubecka, Libor
Kolar, Radim
Jan, Jiri
Source
International Journal of Biomedical Imaging
Issue
Vol. 2010, Issue 2010 (31 Dec. 2010), pp.1-10, 10 p.
Publisher
Hindawi Publishing Corporation
Publication Date
2010-07-04
Country of Publication
Egypt
No. of Pages
10
Main Subjects
Abstract EN
A method for correction of nonhomogenous illumination based on optimization of parameters of B-spline shading model with respect to Shannon's entropy is presented.
The evaluation of Shannon's entropy is based on Parzen windowing method (Mangin, 2000) with the spline-based shading model.
This allows us to express the derivatives of the entropy criterion analytically, which enables efficient use of gradient-based optimization algorithms.
Seven different gradient- and nongradient-based optimization algorithms were initially tested on a set of 40 simulated retinal images, generated by a model of the respective image acquisition system.
Among the tested optimizers, the gradient-based optimizer with varying step has shown to have the fastest convergence while providing the best precision.
The final algorithm proved to be able of suppressing approximately 70% of the artificially introduced non-homogenous illumination.
To assess the practical utility of the method, it was qualitatively tested on a set of 336 real retinal images; it proved the ability of eliminating the illumination inhomogeneity substantially in most of cases.
The application field of this method is especially in preprocessing of retinal images, as preparation for reliable segmentation or registration.
American Psychological Association (APA)
Kubecka, Libor& Jan, Jiri& Kolar, Radim. 2010. Retrospective Illumination Correction of Retinal Images. International Journal of Biomedical Imaging،Vol. 2010, no. 2010, pp.1-10.
https://search.emarefa.net/detail/BIM-497401
Modern Language Association (MLA)
Kubecka, Libor…[et al.]. Retrospective Illumination Correction of Retinal Images. International Journal of Biomedical Imaging No. 2010 (2010), pp.1-10.
https://search.emarefa.net/detail/BIM-497401
American Medical Association (AMA)
Kubecka, Libor& Jan, Jiri& Kolar, Radim. Retrospective Illumination Correction of Retinal Images. International Journal of Biomedical Imaging. 2010. Vol. 2010, no. 2010, pp.1-10.
https://search.emarefa.net/detail/BIM-497401
Data Type
Journal Articles
Language
English
Notes
Includes bibliographical references
Record ID
BIM-497401