Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation

0422848 20240103203636.220140207235959.9 84891291217 000328616100190 10.1117/12.2025134 Blind restoration of retinal images degraded by space-variant blur with adaptive blur estimation 8 s. E cav_un_epca*0424929978-0-8194-9601-00277-786XProceedings ot the 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and ApplicationsBellinghamSPIE2013 medical image retinal image deconvolution deblurring space-variant restoration cav_un_auth*0275488 Marrugo A. ES cav_un_auth*0278222 Millán M. S. ES cav_un_auth*0108377 Zpracování obrazové informace Department of Image Processing ZOI ZOI Department of Image Processing Šorel Michal UTIA-B Ústav teorie informace a automatizace AV ČR, v. v. i. cav_un_auth*0101209 Zpracování obrazové informace Department of Image Processing ZOI ZOI Department of Image Processing Šroubek Filip UTIA-B Ústav teorie informace a automatizace AV ČR, v. v. i. http://library.utia.cas.cz/separaty/2014/ZOI/sorel-0422848.pdf cav_un_auth*0292734 GA13-29225S GA ČR 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. cav_un_auth*0300572 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications 22.07.2013-26.07.2013 Porto PT JD 2014 4 PR RVO:67985556 http://hdl.handle.net/11104/0230915 S 90 0.234 13.98 0.36 Q3 2013 84891291217 SCOPUS 000328616100190 WOS cav_un_epca*0424929 Proceedings ot the 8th Iberoamerican Optics Meeting and 11th Latin American Meeting on Optics, Lasers, and Applications 978-0-8194-9601-0 0277-786X 8785D1 - 1-8785D1 - 8 Bellingham SPIE 2013