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Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation
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SYSNO ASEP 0422848 Document Type C - Proceedings Paper (int. conf.) R&D Document Type Conference Paper Title Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation Author(s) Marrugo, A. (ES)
Millán, M. S. (ES)
Šorel, Michal (UTIA-B) RID, ORCID
Šroubek, Filip (UTIA-B) RID, ORCIDNumber of authors 4 Source Title Proceedings ot the 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications. - Bellingham : SPIE, 2013 - ISSN 0277-786X - ISBN 978-0-8194-9601-0 Pages 8785d1 - 1-8785d1 - 8 Number of pages 8 s. Publication form Online - E Action 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications Event date 22.07.2013-26.07.2013 VEvent location Porto Country PT - Portugal Event type WRD Language eng - English Country US - United States Keywords medical image ; retinal image ; deconvolution ; deblurring ; space-variant restoration Subject RIV JD - Computer Applications, Robotics R&D Projects GA13-29225S GA ČR - Czech Science Foundation (CSF) Institutional support UTIA-B - RVO:67985556 UT WOS 000328616100190 EID SCOPUS 84891291217 DOI 10.1117/12.2025134 Annotation Retinal images are often degraded with a blur that varies across the eld 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 identication of valid local PSFs and perform interpolation to obtain the space-variant PSF. The method was tested on articial and real degraded retinal images. Results show signicant improvement in the visibility of subtle details like small blood vessels. Workplace Institute of Information Theory and Automation Contact Markéta Votavová, votavova@utia.cas.cz, Tel.: 266 052 201. Year of Publishing 2014
Number of the records: 1