NDLI: Fast and robust image registration with local motion estimation for image enhancement and activity detection in retinal imaging

Content Provider	IEEE Xplore Digital Library
Author	Kulcsar, C. Fezzani, R. Le Besnerais, G. Plyer, A. Levecq, X.
Copyright Year	2014
Description	Author affiliation: ONERA (French Aerosp. Lab.), Palaiseau, France (Le Besnerais, G.; Plyer, A.) \|\| Imagine Eyes, Orsay, France (Levecq, X.) \|\| Lab. Charles Fabry, Univ. Paris 11, Palaiseau, France (Kulcsar, C.; Fezzani, R.)
Abstract	Recent retinal imaging systems, including those featuring adaptative optics (AO) correction, produce sequences of images having a very high spatial resolution, but possibly affected by a low Signal-to-Noise Ratio (SNR). A simple, fast and efficient way to improve SNR in many cases is to average images. However, image quality appears to be highly variable from one frame to another, and sequences feature large inter-frame global motions due to eye movements. We consider in this paper both global and local motion estimation to deliver enhanced images or to detect vessel activity. We tackle the problem of retinal vessels local motions due to bloodstream. If not accounted for, these motions lead to some blurring of the enhanced image, which in turn degrades image analysis, for instance the estimation of the thickness of the vessels wall or the wall-to-lumen ratio. Interframe local motions need thus to be estimated. We propose to compensate for local motions using a fast optical flow estimation called FOLKI developed at ONERA/DTIM, which combines very fast computational times with a good accuracy. The method is then applied to detect vessel activity. Improvements are demonstrated both in terms of final image quality and of local activity detection, on sequences recorded on Imagine Eyes' rtx1 system.
Starting Page	1
Ending Page	5
File Size	1459652
Page Count	5
File Format	PDF
ISBN	9781479979714
DOI	10.1109/IWCIM.2014.7008811
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2014-11-01
Publisher Place	France
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Image registration Motion estimation Estimation Optical imaging Retina Adaptive optics Robustness Image reconstruction Optical flow
Content Type	Text
Resource Type	Article

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