Illumination correction and contrast equalization in colour fundus images

Author

Kolar, Radim ; Odstrcilik, Jan ; Jan, Jiri ; Harabis, Vratislav

Author_Institution

Dept. of Biomed. Eng., Brno Univ. of Technol., Brno, Czech Republic

fYear

2011

fDate

Aug. 29 2011-Sept. 2 2011

Firstpage

298

Lastpage

302

Abstract

A method for correction of non-uniform illumination in colour fundus images based on the B-spline approximation of the illumination surface is presented. The control points for B-splines are determined from an original image, separately from the red, green and blue channel. The estimated illumination surface is used in a multiplicative model for fast correction. The proposed approach has been subjectively tested on new publicly available retinal image database DRIIL (Digital Retinal Images for ILumination correction), which contains 165 images. Objective testing has been conducted by investigating the influence of the proposed method on blood-vessel segmentation using another high resolution fundus image dataset of healthy and diabetic patients.

Keywords

eye; image colour analysis; image segmentation; lighting; medical image processing; splines (mathematics); B-spline approximation; DRIIL retinal image database; Digital Retinal Images for ILumination correction; blood-vessel segmentation; colour fundus images; contrast equalization; illumination surface; nonuniform illumination correction; Adaptive optics; Image color analysis; Image segmentation; Lighting; Mathematical model; Optical imaging; Retina;

fLanguage

English

Publisher

ieee

Conference_Titel

Signal Processing Conference, 2011 19th European

Conference_Location

Barcelona

ISSN

2076-1465

Type

conf

Filename

7074258