González Amador, EnriqueArines Piferrer, JustoCharlón Cardeñoso, PabloGarcía Porta, NeryAbraldes, Maximino J.Acosta Plaza, Eva2025-05-262025-05-262022Gonzalez-Amador, E.; Arines, J.; Charlón, P.; Garcia-Porta, N.; Abraldes, M.J.; Acosta, E. Improvement of Retinal Images Affected by Cataracts. Photonics 2022, 9, 251. https://doi.org/10.3390/photonics9040251https://hdl.handle.net/10347/41818Eye fundus images are used in clinical diagnosis for the detection and assessment of retinal disorders. When retinal images are degraded by scattering due to opacities of the eye tissues, the precise detection of abnormalities is complicated depending on the grading of the opacity. This paper presents a concept proof study on the use of the contrast limited adaptive histogram equalization (CLAHE) technique for better visualization of eye fundus images for different levels of blurring due to different stages of cataracts. Processing is performed in three different color spaces: RGB, CIELAB and HSV, with the aim of finding which one better enhances the missed diagnostic features due to blur. The experimental results show that some fundus features not observable by naked eye can be detected in some of the space color processed with the proposed method. In this work, we also develop and provide an online image process, which allows clinicians to tune the default parameters of the algorithm for a better visualization of the characteristics of fundus images. It also allows the choice of a region of interest (ROI) within the images that provide better visualization of some features than those enhanced by the processing of the full picture.eng© 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license. Attribution 4.0 Internationalhttp://creativecommons.org/licenses/by/4.0/Retinal imagesEye opacitiesCataractsCLAHERGBCIELABHSV2209 Óptica220915 Optometría320109 OftalmologíaImprovement of Retinal Images Affected by Cataractsjournal article10.3390/photonics9040251open access