Dr. Nicholas Devaney

B.Sc, PhD

Contact Details

Lecturer Above The Bar
School of Physics
NUIG

T: Ext. 5188
E: nicholas.devaney@nuigalway.ie
 
researcher

Biography



Ph.D. (NUIG then UCG)1989
Royal Greenwich Observatory:Research Associate1989-1991
Observatoire de Meudon, Paris: Research Associate1991-1992
Instituto de Astrofisica de Canarias: Support Astronomer1993-1995
GRANTECAN, Instituto de Astrofisica de Canarias: Adaptive Optics Manager1995-2005
National University of Ireland, Galway: Lecturer2005-



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.

Research Interests

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.

Thermal Imaging
 
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.
Exoplanet Detection

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.

Research Projects

  Project Start Date End Date
EI CS 2008 0124 ITN PROPOSAL N DEVANEY 01-AUG-08 31-MAR-09

Peer Reviewed Journals

  Year Publication
(2015) 'Performance analysis of cone detection algorithms'
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]
(2014) 'Registration of adaptive optics corrected retinal nerve fiber layer (RNFL) images'
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]
(2013) 'Pre-processing, registration and selection of adaptive optics corrected retinal images'
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]
(2013) 'Adaptive optics technology for high-resolution retinal imaging'
M. Lombardo, S. Serrao, N.Devaney, M. Parravano, G. Lombardo (2013) 'Adaptive optics technology for high-resolution retinal imaging'. Sensors, [Details]
(2010) 'Enhanced faint companion photometry and astrometry using wavelength diversity'
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]
(2010) 'Experimental detection of optical vortices with a Shack-Hartmann wavefront sensor'
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]
(2009) 'An Improved Technique for the Photometry and Astrometry of Faint Companions'
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]
(2008) 'Correction of ocular and atmospheric wavefronts: a comparison of the performance of various deformable mirrors'
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]
(2008) 'Chromatic effects of the atmosphere on astronomical adaptive optics'
Devaney, N,Goncharov, AV,Dainty, JC (2008) 'Chromatic effects of the atmosphere on astronomical adaptive optics'. Applied Optics, 47 :1072-1081 [Details]
(2007) 'Application of the Hotelling and ideal observers to detection and localization of exoplanets'
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]
(2007) 'Atmospheric dispersion compensation for extremely large telescopes'
Goncharov, AV,Devaney, N,Dainty, C (2007) 'Atmospheric dispersion compensation for extremely large telescopes'. Optics Express, 15 :1534-1542 [Details]
(2006) 'Reduction of the diffraction pattern in segmented apertures'
Canales, VF,Oti, JE,Valle, PJ,Cagigal, MP,Devaney, N (2006) 'Reduction of the diffraction pattern in segmented apertures'. Optical Engineering, 45 [DOI] [Details]
(2006) 'Phasing segmented mirrors using defocused images at visible wavelengths'
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]
(2006) 'Objective assessment of image quality. IV. Application to adaptive optics'
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]
(2003) 'Optimization with numerical simulations of the conjugate altitudes of deformable mirrors in an MCAO system'
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]
(2002) 'Phasing Segmented mirrors: a modification of the Keck narrow band technique and its application to ELTs'
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]
(2000) 'The effect of Piston Errors on the Image Quality of Segmented mirror telescopes'
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]
(1995) 'The Ha envoronment of T Tauri resolved by speckle interferometry'
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]
(1995) 'Autocorrelation hole in nonlinear image detectors: an estimate using an auxiliary photomultiplier'
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]
(1995) 'A large optical and infrared outburst in OJ 287'
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]
(1992) 'Photometric techniques for close binary and multiple systems'
Devaney, M.N. (1992) 'Photometric techniques for close binary and multiple systems'. Astron Astrophys, 257 (835) [Details]
(1992) 'Binary star studies with small telescopes: photometry of close visual systems'
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]
(1991) 'High-resolution imaging of Virgo cluster galaxies. I - Observational techniques and first results'
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]
(1989) 'IMAGE SHARPENING OF TIME-TAGGED COUNTS FROM A PHOTON-COUNTING DETECTOR - APPLICATION OF A MODIFIED WIENER FILTER'
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]

Book Chapters

  Year Publication
(2002) 'Adaptive Optics: Principles, Performance and Challenges'
Devaney,N. (2002) 'Adaptive Optics: Principles, Performance and Challenges' In: Proceedings of the NATO Advanced Study Institute on Optics in Astrophysics. Cargese, France: [Details]

Conference Publications

  Year Publication
(2014) Irish Machine Vision and Image Processing
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]
(2015) Asian Conference on Computer Vision 2014
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]
(2012) Frontiers in Optics
J. Gallagher, N. Devaney (2012) Wavefront sensing and deconvolution of widefield images of biological samples for microscopy Frontiers in Optics [Details]
(2012) Proc SPIE
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]
(2011) OSA
Devaney, N and Thiebaut, E. (2011) Inverse problem approach to the detection of exoplanets in multiwavelength data OSA [Details]
(2010) Proc. SPIE
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]
(2009) SPIE Optical Measurement Systems for Industrial Inspection VI
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]
(2009) SPIE MEMS Adaptive Optics II
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]
(2008) Proc SPIE
Burke, D., Devaney, N., Gladysz, S. (2008) Optimal linear estimation of binary star parameters Proc SPIE [Details]
(2008) Proc SPIE
Goncharov,A.V., Devaney, N., Farrell,T. (2008) Alternative schemes for multi-reference wavefront sensing Proc SPIE [Details]
(2007) SPIE Adaptive Optics for Laser Systems and Other Applications
Devaney, N. (2007) Review of Astronomical Adaptive Optics and plans SPIE Adaptive Optics for Laser Systems and Other Applications [Details]
(2007) Astronomical Adaptive Optics Systems and Applications III
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]
(2007) 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
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]
(2006) SPIE Advances in Adaptive Optics II
Barrett, H., Myers, K.J., Devaney, N., Dainty, C. (2006) Task performance in astronomical adaptive optics SPIE Advances in Adaptive Optics II [Details]
(2006) Proc SPIE
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]
(2006) Ground-based and Airborne Telescopes, Pts 1 and 2, SPIE
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]
(2004) SPIE Advancements in Adaptive Optics
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]
(2004) Second Backaskog Workshop on Extremely Large Telescopes
Devaney, N., Schumacher, A (2004) Cophasing techniques for extremely large telescopes Second Backaskog Workshop on Extremely Large Telescopes [Details]
(2001) ?Beyond conventional Adaptive Optics?
Esposito, S., Devaney, N. (2001) Segmented mirror co-phasing using a Pyramid Sensor ?Beyond conventional Adaptive Optics? Venice, [Details]
(2001) ?Beyond conventional Adaptive Optics?
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]
(2000) Proc SPIE
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]
(2000) Proc SPIE
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]
(1998) Proc SPIE
Devaney, M.N., Bello, C.D., Keen, J. (1998) Adaptive Optics for the Gran Telescopio Canarias Proc SPIE , pp.561-567 [Details]
(1998) Proc SPIE
Castro, J., Bello, C., Jochum, L., Devaney, N. (1998) Image quality and active optics for the Gran Telescopio Canarias Proc SPIE [Details]
(1998) Proc SPIE
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]
(1998) New Astronomy Reviews
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]
(1997) Proc ESO workshop on ?Laser Guide Star Adaptive Optics?, Garching
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]
(1996) Proc SPIE
Devaney, M.N. (1996) Adaptive Optics plans for the Gran Telescopio Canarias Proc SPIE [Details]
(1996) Proc SPIE
Escudero-Sanz, I., Manescau, A., Devaney, M.N., (1996) Optical configurations of the Gran Telescopio Canarias Proc SPIE [Details]
(1994) IAU Circular
Kidger, M., Devaney, N., Sahu, K., Lopez, S. (1994) Nova Cassiopeiae 1993 IAU Circular [Details]
(1993) IAU Symp
Clegg, R.E.S.C., Devaney, M.N. (1993) Images & Kinematics of the ''born-again' planetary, Abell 78 IAU Symp [Details]
(1993) Proc ESO conference on ?High Resolution Imaging by Interferometry II?
Devaney, M.N. (1993) Speckle Interferometric Observations of Binary Stars from La Palma Proc ESO conference on ?High Resolution Imaging by Interferometry II? [Details]

Conference Paper

  Year Publication
(2008) “Characterisation of MEMS mirrors for use in atmospheric and ocular wavefront correction”. Conference on MEMS Adaptive Optics II, SPIE 88802.
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]
(2008) “Alternative schemes for multi-reference wavefront sensing”. Adaptive Optics Systems.
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]
(2006) Experimental verification of the virtual wavefront sensor concept. Ground-based and Airborne telescopes, Orlando, Florida.
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]
(2006) Task performance in astronomical adaptive optics. Advances in Adaptive Optics II, Orlando Florida.
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]
(2006) Task performance in Astronomical Adaptive Optics. Advances in Adaptive Optics ii Ellerbroek, Bonaccini Calia Orlando.
Barrett, M., Devaney, D., (2006) Task performance in Astronomical Adaptive Optics. Advances in Adaptive Optics ii Ellerbroek, Bonaccini Calia Orlando. Conference Paper [Details]
(2006) Experimental verification of the virtual wavefront sensor concept. Ground-based and Airborne Telescopes LM Stepp.
Goncharov., Devaney., Dainty., Esposito. (2006) Experimental verification of the virtual wavefront sensor concept. Ground-based and Airborne Telescopes LM Stepp. Orlando: Conference Paper [Details]

Invited papers

  Year Publication
(2007) Review of Astronomical Adaptive Optics. Adaptive Optics for Laser systems and other Applications Prague.
Devaney,N. (2007) Review of Astronomical Adaptive Optics. Adaptive Optics for Laser systems and other Applications Prague. Invited papers [Details]

Reviews

  Year Publication
(2013) Adaptive Optics Technology for High-Resolution Retinal Imaging.
Lombardo, M,Serrao, S,Devaney, N,Parravano, M,Lombardo, G (2013) Adaptive Optics Technology for High-Resolution Retinal Imaging. Reviews [DOI] [Details]

Employment

  Employer Position From / To
Royal Greenwich Observatory Post Doctoral Research Associate 01-AUG-89 / 31-DEC-91
Meudon Observatory, Paris Post doctoral researcher 01-JAN-92 / 01-JAN-93
Instituto de Astrofisica de Canarias Support Astronomer 01-JAN-93 / 01-JAN-95
Grantecan, Instituto de Astrofisica de Canarias Adaptive Optics manager 01-JAN-95 / 01-APR-05

Education

  Year Institution Qualification Subject
1989 National University of Ireland
1985 University College Galway

Teaching Interests



Current Teaching:

PH103: History of Astronomy
PH351 : Wave Optics
PH402: Medical Image processing
PH459: Applied Optics 

Past:
PH211: Electricity, Magnetism and circuits