Purpose.: The shape of the human fovea presents important but still poorly characterized variations. In this study, variability and structure normal foveae were examined. Methods.: a group 110 eyes 57 healthy adults, analyzed by automated segmentation retinal layer on high-resolution optical coherence tomography scans. an additional 10 patients undergoing fluorescein angiography, size foveal avascular zone (FAZ) was correlated to shape. Results.: From thickest thinnest fovea, there...

The wall-to-lumen ratio (WLR) of retinal arteries is a recognized surrogate end-organ damage due to aging and/or arterial hypertension. However, parietal morphometry remains difficult assess in vivo. Recently, it was shown that adaptive optics imaging can resolve structures arterioles humans Here, using imaging, we investigated the variations thickness small with blood pressure and focal vascular damage.Adaptive superotemporal artery done 49 treatment-naive individuals [mean age (±SD) 44.9...

In humans, adaptive optics camera enables precise large-scale noninvasive retinal microcirculation evaluation to assess ageing, blood pressure and antihypertensive treatments respective roles on arterioles anatomy.We used rtx1 (Imagine-Eyes, Orsay, France) measure wall thickness, internal diameter calculate wall-to-lumen ratio (WLR) cross-sectional area of arterioles. This assessment was repeated within a short period in two subgroups hypertensive individuals without or with drug-induced...

This article presents an application of wavelet packet analysis to the features extraction part iris recognition system. An energy measure is used identify particular packets that carries discriminating information about texture. Several different orthogonal wavelets arc tested and a comparison nonorthogonal using Gabor done. The experimental results show 100% correct classifications when applying algorithm on image database new therefore interesting alternative based methods.

This paper describes a system for optical music recognition (OMR) in case of monophonic typeset scores. After clarifying the difficulties specific to this domain, we propose appropriate solutions at both image analysis level and high-level interpretation. Thus, segmentation method is designed, that allows dealing with common printing defects numerous symbol interconnections. Then, musical rules are modeled integrated, order make consistent decision. interpretation step relies on fuzzy sets...

In this paper, we propose a method based on morphological and topological analysis for the segmentation of vessels in eye fundus images.This is very important problem, particular quantitative assessment microvascular damage due to arterial hypertension, diabetes aging, such as branch retinal vein occlusions.This paper addresses step required studies.A pre-processing includes filtering enhance vessels.Attribute images are then built from combination top-hat transform (i.e., non linear...

This paper proposes an automated method for the segmentation of eight retinal layers in high resolution OCT images. It has been evaluated based on comparison with manual performed by five different experts. The successfully applied a database 72 Quantitative measures are then derived as aid to ophthalmic diagnosis. A good agreement from is obtained which allows us use proposed variability studies.

Purpose: The purpose of this study was to describe a previously unreported manifestation the optical Stiles-Crawford effect (oSCE) in normal eyes. Methods: In cohort 50 subjects, directional reflectance cones retinal periphery explored by flood-illuminated adaptive optics (FIAO) and coherence tomography (OCT). Results: 32 eyes (64%), off-axis FIAO images (∼15–20° from fovea) showed variably sized patches hyporeflective dots (called here negative mosaic) coexisting with hyperreflective...

Arteriovenous nickings (AVNs) in the retina are cause of retinal vein occlusions and also surrogates cerebrovascular aging. The prevalent mechanistic model AVNs stating that arteries crush veins remains somewhat unchallenged despite lack evidence other than fundus photographs. Here, we observed venous nicking may be absence physical contact with an arteriole. This observational study, conducted from January 2013 to September 2014, included 7 patients showing remodeling a segment close...

This paper presents an iris recognition system, based on a wavelet packet analysis using orthogonal wavelets. The identification of the different packets that carry discriminating information about texture is carried out through energy measure. Tests, conducted database 149 high quality images show good robustness in relation to changes illumination, blurring, optical axis deviation or local defects images.

Purpose: To monitor perivascular sheathing during the course of retinal vasculitis by flood illumination adaptive optics ophthalmoscopy (AOO).Methods: Perivenous and venous diameters were quantitatively analyzed semi-automatic segmentation AOO images in 12 eyes treatment-naive patients with vasculitis.Results: The width ranged from 45 to 225 µm (mean 101.0 ± 54.3). In 10 cases, underlying vein showed focal narrowing SD 14% 10). Focal arteries was also present one eye. At presentation, vessel...

In this paper, we present a method for automatically segmenting the walls of retinal arteries in adaptive optics images. To best our knowledge, is first addressing problem such achieve goal, propose to model these as four curves approximately parallel common reference line located near center vessels. Once detected, are simultaneously positioned close possible borders using an original tracking procedure cope with deformations along Then, their positioning refined deformable embedding...

In this paper, we present a complete system to monitor the growth of tomatoes from images acquired in open fields. This is challenging task because severe occlusion and poor contrast images. We approximate by spheres 3D space, hence ellipses image space. The are first identified using segmentation procedure. Then, size measured obtained camera parameters. shape information combined with temporal information, given limited evolution an next one, used throughout increase robustness respect...

In this paper, we present a segmentation procedure based on parametric active contour with shape constraint, in order to follow the growth of tomatoes from images acquired field.This is challenging task because poor contrast and occlusions by vegetation.In our sequential approach, considering one image per day, assume that available for previous day.An initial curve model computed combining gradient information region information.Then, an constraint applied provide elliptic approximation...

A major hurdle to therapeutic development in cerebral small vessel diseases is the lack of in-vivo method that can be used repeatedly for evaluating directly microvessels. We hypothesised Adaptive Optics (AO), which allows resolution images up 1–2 μm/pixel at retinal level, could provide a biomarker monitoring vascular changes CADASIL, genetic form such condition. In 98 patients and 35 healthy individuals, wall lumen ratio (WLR), outer inner diameter, thickness cross-sectional area were...

Parametric deformable models are an important technique for image segmentation. In order to improve the robustness of model, it may be interesting incorporate a priori information about shape objects segmented. this paper, we propose add parallelism constraint. Such model is relevant in many applications where elongated structures have detected. One main advantage our formulation that only needs few parameters adjusted addition those traditional snakes. The pro- posed has been applied...