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Dr. Nicholas Devaney B.Sc, PhD
My background is in Astronomical Imaging with high spatial resolution, mostly involving Adaptive Optics and Image Processing. My current work in this area concerns the detection of extrasolar planets in data obtained using adaptive optics. I am also interested in the application of adaptive optics and other techniques to the enhancement of microscopy. In addition, I am supervising projects on Image processing of medical images; specifically on the study of retinal disease using adaptive-optics retinal images, the optimal detection of lesions in mammography and computation imaging. The latter is concerned with the combination of optics and image processing to provide new imaging modalities such as 3D imaging, depth estimation, face and gesture detection etc.
| Computational Imaging
Computational imaging involves the combination of optics and image processing to enhance some aspect of imaging or allow the extraction of new information. For example, aperture masks may be designed which extend the depth of focus of a camera, or allow depth to be extracted from images. Plenoptic cameras and camera arrays provide information on the 'light field' i.e. the direction of the rays from the objects in the scene. This information allows digital re-focusing, the generation of synthetic views and recovery of 3D object shape. The gain in angular information is traded against spatial resolution, and we are investigating techniques to provide higher spatial resolution. This will be particularly important for applications in microscopy as well as macroscopic applications, such as face and gesture recognition.
High-resolution retinal image processing
Adaptive optics is now used to provide images of the retina with unprecedented detail. Image processing can further enhance these images by selecting those images with the highest contrast, and precisely registering the images. We use a multi-resolution approach based on wavelets to carry out these tasks. We are also developing ways to automatically detect photoreceptors (cones and rods) and nerve fivers in the retinal images. Quantification of these structures at high resolution will allow early detection of retinal disease, and tracking the effects of treatment. We are carrying out this work in close collaboration with ophthalmologists.
Enhancing microscopy using Adaptive Optics and deconvolution
Images obtained with microscopes may be blurred by aberrations introduced by the sample. Adaptive optics has been used recently to correct for these aberrations and provide clearer images. Alternatively, the aberrations can be measured and the correction applied in post-processing. We are comparing these approaches in order to understand the relative benefits as applied to different modes of microscopy.
We are investigating the combination of thermal and visual imaging for novel applications. The thermal imager has much lower spatial resolution than the visual camera, and we are developing techniques to 'fuse' the data from the two systems in order to enhance enhance the function. An example of application is the measurement of core body temperature from the nasal corner of the eye.
A large number of planets have been detected outside our solar system using indirect techniques (e.g. see here). Imaging of these exoplanets is extremely challenging given how close they are to their parent stars, and how much fainter. The brightness ratio with the parent star is of the order 10^-6 to 10^-9. Obtaining such images will require using large (or extremely large) telescopes, with practically perfect adaptive optics. Even so, residual speckle effects severely hamper our ability to unambiguously detect exoplanets. We have developed optimal techniques based on using knowledge of the data statistics. We have also developed a powerful inverse-problem approach applicable to multi-wavelength data. This exploits the fact that the position of residual speckles scales with wavelength, and this fact may be used to discriminate speckles from planets. We want to extend these approaches to future Extremely Large Telescopes.
Lesion detection in mammography
The sort of optimal detection techniqes which we have developed for exoplanet images can be applied to many tasks; one example is the detection of lesions in mammographs. This is complicated by the fact that there are many different kinds of lesion, and the background tissue varies greatly between subjects.
Project: EI CS 2008 0124 ITN PROPOSAL N DEVANEY ( REI705)
Start/End Dates: 01-AUG-08 / 31-MAR-09
|Devaney,N. (2002) 'Adaptive Optics: Principles, Performance and Challenges' In: Proceedings of the NATO Advanced Study Institute on Optics in Astrophysics. Cargese, France: [Details]|
Peer Reviewed Journals
|L. Mariotti and N. Devaney (2015) 'Performance analysis of cone detection algorithms'. Journal Of The Optical Society Of America A-Optics Image Sci, 32 . [Details]|
|Ramaswamy, G,Lombardo, M,Devaney, N (2014) 'Registration of adaptive optics corrected retinal nerve fiber layer (RNFL) images'. Biomedical Optics Express, 5 :1941-1951. [DOI] [Details]|
|Ramaswamy, G,Devaney, N (2013) 'Pre-processing, registration and selection of adaptive optics corrected retinal images'. Ophthalmic And Physiological Optics, 33 :527-539. [DOI] [Details]|
|M. Lombardo, S. Serrao, N.Devaney, M. Parravano, G. Lombardo (2013) 'Adaptive optics technology for high-resolution retinal imaging'. Sensors, . [Details]|
|Burke, D,Devaney, N (2010) 'Enhanced faint companion photometry and astrometry using wavelength diversity'. Journal Of The Optical Society Of America A-Optics Image Science And Vision, 27 :246-252. [Details]|
|Murphy, K,Burke, D,Devaney, N,Dainty, C (2010) 'Experimental detection of optical vortices with a Shack-Hartmann wavefront sensor'. Optics Express, 18 :15448-15460. [Details]|
|Burke, D,Gladysz, S,Roberts, L,Devaney, N,Dainty, C (2009) 'An Improved Technique for the Photometry and Astrometry of Faint Companions'. Publ Astron Soc Pac, 121 :767-777. [Details]|
|Devaney, N,Dalimier, E,Farrell, T,Coburn, D,Mackey, R,Mackey, D,Laurent, F,Daly, E,Dainty, C (2008) 'Correction of ocular and atmospheric wavefronts: a comparison of the performance of various deformable mirrors'. Applied Optics, 47 :6550-6562. [Details]|
|Devaney, N,Goncharov, AV,Dainty, JC (2008) 'Chromatic effects of the atmosphere on astronomical adaptive optics'. Applied Optics, 47 :1072-1081. [Details]|
|Caucci, L,Barrett, HH,Devaney, N,Rodriguez, JJ (2007) 'Application of the Hotelling and ideal observers to detection and localization of exoplanets'. Journal Of The Optical Society Of America A-Optics Image Science And Vision, 24 :13-24. [Details]|
|Goncharov, AV,Devaney, N,Dainty, C (2007) 'Atmospheric dispersion compensation for extremely large telescopes'. Optics Express, 15 :1534-1542. [Details]|
|Canales, VF,Oti, JE,Valle, PJ,Cagigal, MP,Devaney, N (2006) 'Reduction of the diffraction pattern in segmented apertures'. Optical Engineering, 45 . [DOI] [Details]|
|Schumacher, A,Devaney, N (2006) 'Phasing segmented mirrors using defocused images at visible wavelengths'. Monthly Notices Of The Royal Astronomical Society, 366 :537-546. [DOI] [Details]|
|Barrett, HH,Myers, KJ,Devaney, N,Dainty, C (2006) 'Objective assessment of image quality. IV. Application to adaptive optics'. Journal Of The Optical Society Of America A-Optics Image Science And Vision, 23 :3080-3105. [Details]|
|Femenia, B., Devaney, N. (2003) 'Optimization with numerical simulations of the conjugate altitudes of deformable mirrors in an MCAO system'. Astron Astrophys, (404):1165-1176. [Details]|
|Schumacher, A., Devaney, N., Montoya, L. (2002) 'Phasing Segmented mirrors: a modification of the Keck narrow band technique and its application to ELTs'. Applied Optics, 41 :1297-1307. [Details]|
|Bello, C.D., Devaney, N., Castro, J. (2000) 'The effect of Piston Errors on the Image Quality of Segmented mirror telescopes'. ReV Mex Astron Astrophys, 36 :57-66. [Details]|
|Devaney, M.N., Thiébaut, E., Foy, R., Blazit, A., Bonneau, D., Bouvier, J., De Batz, B., Thom, Ch. (1995) 'The Ha envoronment of T Tauri resolved by speckle interferometry'. Astron Astrophys, 300 (181). [Details]|
|Cagigal, M.P., Prieto, P.M., Rodríguez, A., Fuensalida, J.J., Devaney, M.N. (1995) 'Autocorrelation hole in nonlinear image detectors: an estimate using an auxiliary photomultiplier'. Opt Lett, 20 (2448). [Details]|
|Kidger, M. R., Gonzalez-Perez, J. N., de Diego, J. A., Zapatero-Osorio, M. R., Hammersley, P. L., Cepa, J., Devaney, N., Sahu, K., Vidal, I. (1995) 'A large optical and infrared outburst in OJ 287'. Astron Astrophys Suppl, (113). [Details]|
|Devaney, M.N. (1992) 'Photometric techniques for close binary and multiple systems'. Astron Astrophys, 257 (835). [Details]|
|Dick, J.S.B., Devaney, M.N., Argyle, R.W., Jones, D.H.P. (1992) 'Binary star studies with small telescopes: photometry of close visual systems'. Meas Sci Technol, 3 (184). [Details]|
|Tanvir, N. R., Shanks, T., Major, J. V., Doel, A. P., Dunlop, C. N., Myers, R. M., Redfern, R. M., O'Kane, P., Devaney, M. N. (1991) 'High-resolution imaging of Virgo cluster galaxies. I - Observational techniques and first results'. MNRAS, 253 :21-24. [Details]|
|REDFERN, RM,DEVANEY, MN,OKANE, P,RAMIREZ, EB,RENASCO, RG,ROSA, F (1989) 'IMAGE SHARPENING OF TIME-TAGGED COUNTS FROM A PHOTON-COUNTING DETECTOR - APPLICATION OF A MODIFIED WIENER FILTER'. Monthly Notices Of The Royal Astronomical Society, 238 :791-806. [Details]|
|Xu, S. and Devaney, N. (2014) Vignetting Modeling and Correction for a Microlens-based Light Field Camera . In: S. Coleman, B. Gardiner and D. Kerr eds. Irish Machine Vision and Image Processing Derry, , 27-AUG-14 - 29-AUG-14 [Details]|
|Xu. S., Zhi-Liang, Z., Devaney, N. (2015) Multi-view Image Restoration From Plenoptic Raw Images Asian Conference on Computer Vision 2014 Singapore, , 01-NOV-14 - 05-NOV-14 [Details]|
|J. Gallagher, N. Devaney (2012) Wavefront sensing and deconvolution of widefield images of biological samples for microscopy Frontiers in Optics [Details]|
|P.R. Lawson, R. Frazin, H.H. Barrett, L. Caucci, N. Devaney (2012) On advanced estimation techniques for exoplanet detection and characterization using ground-based coronagraphs Proc SPIE [Details]|
|Devaney, N and Thiebaut, E. (2011) Inverse problem approach to the detection of exoplanets in multiwavelength data OSA [Details]|
|5. Ridgway, S., ten Brummelaar, T., Sturmann, J., Sturmann, L., Turner, N., McAlister, H., Monnier, J., Ireland, M., Tuthill, P., Coburn, D., Dainty, C., Devaney, N., Goncharov, A., Mozurkewich, D. (2010) Adaptive optics for the CHARA array II Proc. SPIE [Details]|
|A.V. Goncharov, L. Lobato Bailon, N. Devaney, J.C. Dainty (2009) Optical testing of lens systems with concentric design SPIE Optical Measurement Systems for Industrial Inspection VI [Details]|
|N. Devaney, D. Coburn, C. Coleman, J.C. Dainty, E. Dalimier, T. Farrell, D. Lara, D. Mackey, R. Mackey (2009) Characterisation of MEMs mirrors for use in atmospheric and ocular wavefront correction SPIE MEMS Adaptive Optics II [Details]|
|Burke, D., Devaney, N., Gladysz, S. (2008) Optimal linear estimation of binary star parameters Proc SPIE [Details]|
|Goncharov,A.V., Devaney, N., Farrell,T. (2008) Alternative schemes for multi-reference wavefront sensing Proc SPIE [Details]|
|Devaney, N. (2007) Review of Astronomical Adaptive Optics and plans SPIE Adaptive Optics for Laser Systems and Other Applications [Details]|
|Myers,R.M.,Bonaccini Calia,D.,Devaney, N.,Esposito,S.,Goodsell,S.J.,Goncharov, A., Guerra,J.C.,Guillet de Chatellus,H.,Harrison, M.A., Holzloehner,R.,Marchetti, E.,Morris,T.J.,Pinna,E., Pique,J.P.,Rabien,S.,Reyes,M.,Ribak, E., Rutten,R.G.M.,Schnetler,H.,Strachan, M., Stuik,R.,Talbot,R.G.,Tulloch,S.M. (2007) The European LGS test facility Astronomical Adaptive Optics Systems and Applications III [Details]|
|Myers,R.M.,Calia,D.B., Devaney, N.,Esposito,S.,Goodsell, S.J.,Goncharov,A.V.,Guerra,J.C., Guillet de Chatellus, H.,Harrison, M.A.,Holzloehner,R.,Marchetti, E.,Morris, T.J., Pinna,E.,Pique, J.,Rabien,S.,Reyes,M.,Ribak,E.,Rutten,R.G., Schnetler,H.,Strachan, M.,Stuik,R., Talbot,R.G. (2007) The European E-ELT WHT LGS Test Facility Consortium Adaptive Optics: Analysis and Methods/Computational Optical Sensing and Imaging/Information Photonics/Signal Recovery and Synthesis Topical Meetings on CD-ROM, OSA Technical Digest (CD) (Optical Society of America, 2007), paper AWD5 [Details]|
|Barrett, H., Myers, K.J., Devaney, N., Dainty, C. (2006) Task performance in astronomical adaptive optics SPIE Advances in Adaptive Optics II [Details]|
|Cuevas,S.,Sanchez,B., Bringas,V.,Espejo, C.,Flores,R.,Capa,O.,Lara,G.,Chavoya,A.,Anguiano,G.,Arciniega,S.,Dorantes,A.,Gonzalez, J.L., Montoya,M.,Toral,R., Hernez,H., Nava,R.,Devaney,N.,Castro,J.,Cavaller,L.,Farah,A., Godoy,J., Cobos,F.J., Tejada,C., Garfias,F. (2006) Site acceptance of the commissioning instrument for the Gran Telescopio Canarias Proc SPIE [Details]|
|Devaney,N.,Dainty,C.,Esposito,S. (2006) Experimental verification of the virtual wavefront sensor concept - art. no. 62672M Ground-based and Airborne Telescopes, Pts 1 and 2, SPIE , pp.M2672-M2672 [Details]|
|Devaney, N.; Bello, D.; Femenia, B.; Castro, J.; Villegas Lopez, A.; Reyes, M.; Fuensalida, J. (2004) Preliminary design and plans for the GTC adaptive optics system SPIE Advancements in Adaptive Optics [Details]|
|Devaney, N., Schumacher, A (2004) Cophasing techniques for extremely large telescopes Second Backaskog Workshop on Extremely Large Telescopes [Details]|
|Esposito, S., Devaney, N. (2001) Segmented mirror co-phasing using a Pyramid Sensor ?Beyond conventional Adaptive Optics? Venice, [Details]|
|Schumacher, A., Montoya, L., Devaney, N., Dohlen, K., Dierickx, P. (2001) Phasing ELTs for Adaptive Optics-Preliminary results of a comparison of techniques ?Beyond conventional Adaptive Optics? Venice, [Details]|
|Castro, F.J., Devaney, N., Jochum, L., Ronquillo, B., Cavaller, L., (2000) The status of the design and fabrication of the GTC mirrors Proc SPIE , pp.24-33 [Details]|
|Devaney, N., Cavaller,L., Jochum, L., Bello, C.D., Castro, J. (2000) Guacamole: the GTC Guiding, Acquisition and Calibration Module Proc SPIE , pp.146-153 [Details]|
|Devaney, M.N., Bello, C.D., Keen, J. (1998) Adaptive Optics for the Gran Telescopio Canarias Proc SPIE , pp.561-567 [Details]|
|Castro, J., Bello, C., Jochum, L., Devaney, N. (1998) Image quality and active optics for the Gran Telescopio Canarias Proc SPIE [Details]|
|Jochum, L.J., Castro, J., Devaney, M.N. (1998) Gran Telescopio Canarias: current status of its optical design and opto-mechanical support system Proc SPIE [Details]|
|Devaney, M.N., Keen, J. (1998) The use of turbulence profile measurements to predict the performance of Adaptive Optics Systems New Astronomy Reviews , pp.459-463 [Details]|
|Devaney, M.N. (1997) Adaptive Optics & Laser Guide Star performance estimates for the Gran Telescopio Canarias Proc ESO workshop on ?Laser Guide Star Adaptive Optics?, Garching [Details]|
|Devaney, M.N. (1996) Adaptive Optics plans for the Gran Telescopio Canarias Proc SPIE [Details]|
|Escudero-Sanz, I., Manescau, A., Devaney, M.N., (1996) Optical configurations of the Gran Telescopio Canarias Proc SPIE [Details]|
|Kidger, M., Devaney, N., Sahu, K., Lopez, S. (1994) Nova Cassiopeiae 1993 IAU Circular [Details]|
|Clegg, R.E.S.C., Devaney, M.N. (1993) Images & Kinematics of the ''born-again' planetary, Abell 78 IAU Symp [Details]|
|Devaney, M.N. (1993) Speckle Interferometric Observations of Binary Stars from La Palma Proc ESO conference on ?High Resolution Imaging by Interferometry II? [Details]|
|Devaney,N. et al (2008) “Characterisation of MEMS mirrors for use in atmospheric and ocular wavefront correction”. Conference on MEMS Adaptive Optics II, SPIE 88802. San Jose, CA: Conference Paper [Details]|
|Goncharov,A.V.,Devaney, N.M.,Farrell,T.,Dainty,J.C. (2008) “Alternative schemes for multi-reference wavefront sensing”. Adaptive Optics Systems. Marseille: Conference Paper [Details]|
|Goncharov, A.V.,Devaney, N., Dainty,J.C.,Esposito,S. (2006) Experimental verification of the virtual wavefront sensor concept. Ground-based and Airborne telescopes, Orlando, Florida. Conference Paper [Details]|
|Barrett,H.H.,Myers,K.J.,Devaney,N.,Dainty,J.C. (2006) Task performance in astronomical adaptive optics. Advances in Adaptive Optics II, Orlando Florida. Conference Paper [Details]|
|Barrett, M., Devaney, D., (2006) Task performance in Astronomical Adaptive Optics. Advances in Adaptive Optics ii Ellerbroek, Bonaccini Calia Orlando. Conference Paper [Details]|
|Goncharov., Devaney., Dainty., Esposito. (2006) Experimental verification of the virtual wavefront sensor concept. Ground-based and Airborne Telescopes LM Stepp. Orlando: Conference Paper [Details]|
|Devaney,N. (2007) Review of Astronomical Adaptive Optics. Adaptive Optics for Laser systems and other Applications Prague. Invited papers [Details]|
|Lombardo, M,Serrao, S,Devaney, N,Parravano, M,Lombardo, G (2013) Adaptive Optics Technology for High-Resolution Retinal Imaging. Reviews [DOI] [Details]|
| Employer: Royal Greenwich Observatory
Position: Post Doctoral Research Associate
| Employer: Meudon Observatory, Paris
Position: Post doctoral researcher
| Employer: Instituto de Astrofisica de Canarias
Position: Support Astronomer
| Employer: Grantecan, Instituto de Astrofisica de Canarias
Position: Adaptive Optics manager
| Year 1989 Institution: National University of Ireland
| Year 1985 Institution: University College Galway
PH103: History of Astronomy
PH351 : Wave Optics
PH402: Medical Image processing
PH459: Applied Optics
PH211: Electricity, Magnetism and circuits