Ultra-Widefield Fluorescein Angiography Image Brightness Compensation Based on Geometrical Features.
FA
UWFA
curve length
gamma correction
image enhancement
image processing
ophthalmology
solid angle
Journal
Sensors (Basel, Switzerland)
ISSN: 1424-8220
Titre abrégé: Sensors (Basel)
Pays: Switzerland
ID NLM: 101204366
Informations de publication
Date de publication:
21 Dec 2021
21 Dec 2021
Historique:
received:
26
10
2021
revised:
08
12
2021
accepted:
16
12
2021
entrez:
11
1
2022
pubmed:
12
1
2022
medline:
13
1
2022
Statut:
epublish
Résumé
Ultra-widefield fluorescein angiography (UWFA) is an emerging imaging modality used to characterise pathologies in the retinal vasculature, such as microaneurysms (MAs) and vascular leakages. Despite its potential value for diagnosis and disease screening, objective quantitative assessment of retinal pathologies by UWFA is currently limited because laborious manual processing is required. In this report, we describe a geometrical method for uneven brightness compensation inherent to UWFA imaging technique. The correction function is based on the geometrical eyeball shape, therefore it is fully automated and depends only on pixel distance from the center of the imaged retina. The method's performance was assessed on a database containing 256 UWFA images with the use of several image quality measures that show the correction method improves image quality. The method is also compared to the commonly used CLAHE approach and was also employed in a pilot study for vascular segmentation, giving a noticeable improvement in segmentation results. Therefore, the method can be used as an image preprocessing step in retinal UWFA image analysis.
Identifiants
pubmed: 35009554
pii: s22010012
doi: 10.3390/s22010012
pmc: PMC8747562
pii:
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Subventions
Organisme : Silesian University of Technology
ID : 07/010/RGJ20/0043
Organisme : Silesian University of Technology
ID : 07/010/SDU/10-22-01
Organisme : National Centre for Research and Development
ID : STRATEGMED1/234261/2/NCBR/2014
Organisme : Silesian University of Technology
ID : BK-296/RIB1/2021
Organisme : Ministry of Science
ID : 07/010/BK_21/1006
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