18 November 2013 Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation
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Proceedings Volume 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications; 8785D1 (2013) https://doi.org/10.1117/12.2025134
Event: 8th Ibero American Optics Meeting/11th Latin American Meeting on Optics, Lasers, and Applications, 2013, Porto, Portugal
Abstract
Retinal images are often degraded with a blur that varies across the field view. Because traditional deblurring algorithms assume the blur to be space-invariant they typically fail in the presence of space-variant blur. In this work we consider the blur to be both unknown and space-variant. To carry out the restoration, we assume that in small regions the space-variant blur can be approximated by a space-invariant point-spread function (PSF). However, instead of deblurring the image on a per-patch basis, we extend individual PSFs by linear interpolation and perform a global restoration. Because the blind estimation of local PSFs may fail we propose a strategy for the identification of valid local PSFs and perform interpolation to obtain the space-variant PSF. The method was tested on artificial and real degraded retinal images. Results show significant improvement in the visibility of subtle details like small blood vessels.
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Andrés G. Marrugo, Andrés G. Marrugo, María S. Millán, María S. Millán, Michal Šorel, Michal Šorel, Filip Šroubek, Filip Šroubek, } "Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation", Proc. SPIE 8785, 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications, 8785D1 (18 November 2013); doi: 10.1117/12.2025134; https://doi.org/10.1117/12.2025134
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