Search results for " Photography"
showing 10 items of 107 documents
Retinal Imaging through Phakic Iris-Claw IOL.
2014
AbstractBackground: Phakic anterior chamber iris-fixated IOL (PIOL) are established for the correction of high myopia. These patients require attention to macular pathologies. This study was to evaluate the quality of imaging through the PIOLs. Methods: 54 eyes of 31 myopic and hyperopic patients with Verisyse®, Verisyse toric®, and Veriflex® phakic iris-fixated IOL were included. Mean preoperative refraction was −11.0 D and +5.7 D, respectively; mean follow-up time was 7.4 years (5–11 years). A matched control group was formed without PIOL implantation. OCT scans were performed and evaluated qualitatively and quantitatively. Results: In 52 eyes of 31 patients (96%), a 3D-OCT image and fund…
Correlations between central corneal thickness and general anthropometric characteristics and cardiovascular parameters in a large European cohort fr…
2014
PURPOSE The aim of this study was to evaluate the correlations between general anthropometric features and cardiovascular parameters and central corneal thickness (CCT) in an adult European cohort. METHODS Analysis was based on a Gutenberg Health Study cohort that included 5000 subjects (2540 male, 2460 female), aged 35 to 74 years at enrollment. The participants underwent a standardized protocol with a comprehensive questionnaire; ophthalmic examination (slit-lamp biomicroscopy; autorefractometry; noncontact tonometry; fundus photography; CCT measurements (optical pachymetry); visual field testing; and a thorough general examination focused on cardiovascular parameters, psychosomatic evalu…
Optical coherence tomography of chorioretinal and choroidal folds
2007
. Purpose: To report the optical coherence tomography (OCT) findings in cases of chorioretinal and choroidal folds. Methods: Eight subjects with folds of the fundus of the eye were examined with fundus photography, fluorescein angiography, B-scan ultrasonography and Stratus OCT. Results: Two types patterns were found on OCT. Five cases showed undulating retinal as well as retinal pigment epithelial lines of normal thickness; these were defined as chorioretinal folds. The posterior vitreous surface often adhered to the crests of the folds only. Three cases exhibited a wavy appearance of the retinal pigment epithelium and a flat retinal surface; these were classified as choroidal folds. Co…
Scratches Removal in Digitised Aerial Photos Concerning Sicilian Territory
2007
In this paper we propose a fast and effective method to detect and restore scratches in aerial photos from a photographic archive concerning Sicilian territory. Scratch removal is a typical problem for old movie films but similar defects can be seen in still images. Our solution is based on a semiautomatic detection process and an unsupervised restoration algorithm. Results are comparable with those obtained with commercial restoration tools.
Gully erosion susceptibility assessment by means of GIS-based logistic regression: A case of Sicily (Italy)
2014
article i nfo Article history: This research aims at characterizing susceptibility conditions to gully erosion by means of GIS and multivariate statistical analysis. The study area is a 9.5 km 2 river catchment in central-northern Sicily, where agriculture ac- tivities are limited by intense erosion. By means of field surveys and interpretation of aerial images, we prepared a digitalmap of thespatial distribution of 260 gulliesinthestudy area.Inaddition,fromavailable thematicmaps, a 5 m cell size digital elevation model and field checks, we derived 27 environmental attributes that describe the variability of lithology, land use, topography and road position. These attributes were selected f…
Quantitative colorimetric analysis of some inorganic salts using digital photography
2011
An analytical imaging approach to the quantitation of dissolved chemical species absorbed in the visible spectral region is reported. The approach uses digital images of a series of standard solutions of the target substance and their processing with appropriate software to assign a numeric value to each standard in terms of color intensity. Such a value is directly proportional to the analyte concentration and allows the construction of a calibration graph. The results thus obtained are compared with those provided by the classical spectrophotometricmethod used to run calibration curves for colored substances. The chemical imaging technique is relative simple and affordable; in fact, it ca…
FIctional Artworks. Literary Ékphrasis and the Invention of Images
2016
The volume is devoted to images in painting, photography and cinema invented by literature. At the same time it intends to question, through this perspective, the relationship between text and image, between verbal and visual in modern and contemporary literature. The authors investigate the mutual boundaries between literature and arts from the point of view of aesthetics, visual culture and literary theory, trying to build a map of the notional ékphrasis, a description which constitutes the work of art while telling it.
Soglie narrative e fotografiche in “Leggenda privata” di Michele Mari
2018
The aim of the paper is to analyze the narrative and photographic thresholds of Leggenda privata by Michele Mari (2017). The first case is a rhetorical artifice, a horror-gothic-fantastic narrative threshold, that Mari creates to distinguish the present of writing from the past of memories, intended, as I will try to demonstrate, to problematize the crucial questions of autobiography: incipit and explicit of the narration, literature and bios, fiction and non-fiction. Mari adds another expedient to this one: the inclusion of family photographs, selected from his personal archive, and that, for the variety of their authors, reveal another threshold, that between the writer and the photograph…
LogDet divergence-based metric learning with triplet constraints and its applications.
2014
How to select and weigh features has always been a difficult problem in many image processing and pattern recognition applications. A data-dependent distance measure can address this problem to a certain extent, and therefore an accurate and efficient metric learning becomes necessary. In this paper, we propose a LogDet divergence-based metric learning with triplet constraints (LDMLT) approach, which can learn Mahalanobis distance metric accurately and efficiently. First of all, we demonstrate the good properties of triplet constraints and apply it in LogDet divergence-based metric learning model. Then, to deal with high-dimensional data, we apply a compressed representation method to learn…
Image Processing Chain For Digital Still Cameras Based On The Simpil Architecture
2005
The new generation of wireless devices herald the development of products for integrated portable image and video communication requiring to image and video applications high computing performance. Portable MultiMedia Supercomputers (PMMS), a new class of architectures, allow to combine high computational performance, needed by multimedia applications, and a big energy efficiency, needed by portable devices. Among PMMS, the SIMPil (SIMD processor pixel) architecture satisfies the above requirements, especially with video and digital images processing tasks. In this paper we, exploit the SIMPil computation and throughput efficiency to implement the whole image processing chain of a digital s…