Browsing by Author "Devaney, Nicholas"
Now showing items 1-20 of 21
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Adaptive optics technology for high-resolution retinal imaging
Lombardo, Marco; Serrao, Sebastiano; Devaney, Nicholas; Parravano, Mariacristina; Lombardo, Giuseppe (MDPI AG, 2012-12-27)Adaptive optics (AO) is a technology used to improve the performance of optical systems by reducing the effects of optical aberrations. The direct visualization of the photoreceptor cells, capillaries and nerve fiber bundles ... -
An improved technique for the photometry and astrometry of faint companions
Burke, Daniel; Gladysz, Szymon; Roberts, Lewis; Devaney, Nicholas; Dainty, Chris (IOP Publishing, 2009-07-01)We propose a new approach to differential astrometry and photometry of faint companions in adaptive optics images. It is based on a prewhitening matched filter, also referred to in the literature as the Hotelling observer. ... -
Analysis of cone mosaic reflectance properties in healthy eyes and in eyes with nonproliferative diabetic retinopathy over time
Mariotti, Letizia; Devaney, Nicholas; Lombardo, Giuseppe; Lombardo, Marco (Association for Research in Vision and Ophthalmology (ARVO), 2017-08-18)PURPOSE. We investigate the reflectance properties of the cone mosaic in adaptive optics (AO) images of healthy subjects and subjects with nonproliferative diabetic retinopathy (NPDR) over time. METHODS. We acquired images ... -
Analysis of EMCCD gain estimation techniques for use in astronomical instruments
McErlean, Donal (NUI Galway, 2023-09-14)Electron-multiplied Charge Coupled Devices (EMCCDs) are used in many astro nomical instruments where they provide much improved signal to noise compared to conventional CCDs. However, the gain provided by electron-multiplication ... -
Depth of field reduction for miniature-camera imaging
Cognard, Timothée E. (NUI Galway, 2020-08-25)This thesis investigates the reduction of depth-of- field for miniature camera systems, such as the ones embedded in smartphones. The work on digital shallow depth-of- field is already mature and implemented in most modern ... -
Detection of faint exoplanets in multispectral data
Hanley, Kenneth (NUI Galway, 2019-04-15)The detection of extrasolar planets is extremely difficult due to their extreme faintness and proximity to their parent stars. Direct, ground-based detection is particularly challenging and despite the incredible contrast ... -
Image super-resolution for consumer thermal cameras
Lynch, Colm (NUI Galway, 2019-01-21)This thesis attempts to solve a problem currently faced by consumer-grade thermal cameras. Consumers have grown accustomed to the high pixel counts and high resolution offered by the modern smartphone, while the performance ... -
Irish Machine Vision and Image Processing Conference Proceedings 2016
Devaney, Nicholas (Irish Pattern Recognition and Classification Society, 2016)[No abstract available] -
Objective assessment of image quality iv application to adaptive optics
Barrett, Harrison H.; Myers, Kyle J.; Devaney, Nicholas; Dainty, Christopher (The Optical Society, 2006-12-01) -
Performance analysis of cone detection algorithms
Mariotti, Letizia; Devaney, Nicholas (Optical Society of America, 2015-04-01)Many algorithms have been proposed to help clinicians evaluate cone density and spacing, as these may be related to the onset of retinal diseases. However, there has been no rigorous comparison of the performance of these ... -
Performance analysis of cone detection algorithms
Mariotti, Letizia; Devaney, Nicholas (The Optical Society, 2015-03-04) -
Pex 1. multi-spectral expansion of residual speckles for planet detection
Devaney, Nicholas; Thiebaut, Eric (Oxford University Press (OUP), 2017-08-30)The detection of exoplanets in coronographic images is severely limited by residual starlight speckles. Dedicated post-processing can drastically reduce this 'stellar leakage' and thereby increase the faintness of detectable ... -
Phytochrome a and b regulate primary metabolism in arabidopsis leaves in response to light
Han, Xiaozhen; Tohge, Takayuki; Lalor, Pierce; Dockery, Peter; Devaney, Nicholas; Esteves-Ferreira, Alberto A.; Fernie, Alisdair R.; Sulpice, Ronan (Frontiers Media SA, 2017-08-09)Primary metabolism is closely linked to plant productivity and quality. Thus, a better understanding of the regulation of primary metabolism by photoreceptors has profound implications for agricultural practices and ... -
Pre-processing, Registration and Quality Assessment of Adaptive Optics Assisted Retinal Images
Ramaswamy, Gomathy (2014-01-27)In recent decades, adaptive optics (AO) technology has been embedded into retinal imaging devices, producing a new generation of instrument, which can provide retinal images with cellular resolution. This new technological ... -
Processing of adaptive optics photoreceptor images and application to the study of healthy and diabetic retinas
Mariotti, Letizia (2017-11-17)The introduction of adaptive optics (AO) into vision science has made it possible for clinicians to study the human retina in vivo with high-resolution images. The study of AO images of the cone photoreceptor mosaic is ... -
Registration of adaptive optics corrected retinal nerve fiber layer (rnfl) images
Ramaswamy, Gomathy; Lombardo, Marco; Devaney, Nicholas (The Optical Society, 2014-05-22) -
Reliability and agreement between metrics of cone spacing in adaptive optics images of the human retinal photoreceptor mosaic
Giannini, Daniela; Lombardo, Giuseppe; Mariotti, Letizia; Devaney, Nicholas; Serrao, Sebastiano; Lombardo, Marco (Association for Research in Vision and Ophthalmology (ARVO), 2017-06-20)PURPOSE. To assess reliability and agreement among three metrics used to evaluate the distribution of cell distances in adaptive optics (AO) images of the cone mosaic. METHODS. Using an AO flood illumination retinal camera, ... -
A review of resolution losses for AR/VR foveated imaging applications
Cognard, Timothee E.; Goncharov, Alexander; Devaney, Nicholas; Dainty, Chris; Corcoran, Peter (Institute of Electrical and Electronics Engineers, 2018-08-15)Foveated imaging is of great interest for Augmented and Virtual Reality applications. The resolution losses off-axis simulated in foveated imaging are modelled using cone density on the retina. This article reviews the ... -
Understanding the changes of cone reflectance in adaptive optics flood illumination retinal images over three years
Mariotti, Letizia; Devaney, Nicholas; Lombardo, Giuseppe; Lombardo, Marco (Optical Society of America, 2016)Although there is increasing interest in the investigation of cone reflectance variability, little is understood about its characteristics over long time scales. Cone detection and its automation is now becoming a fundamental ... -
Understanding the changes of cone reflectance in adaptive optics flood illumination retinal images over three years
Mariotti, Letizia; Devaney, Nicholas; Lombardo, Giuseppe; Lombardo, Marco (The Optical Society, 2016-06-24)