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Dissertations / Theses on the topic 'Photometric'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

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1

Halliday, Colin George. "Aspects of photometric titration." Thesis, Queen's University Belfast, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.329513.

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2

Powell, Christopher. "Mutual illumination photometric stereo." Thesis, University of East Anglia, 2018. https://ueaeprints.uea.ac.uk/67065/.

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Many techniques have been developed in computer vision to recover three-dimensional shape from two-dimensional images. These techniques impose various combinations of assumptions/restrictions of conditions to produce a representation of shape (e.g. surface normals or a height map). Although great progress has been made it is a problem which remains far from solved. In this thesis we propose a new approach to shape recovery - namely `mutual illumination photometric stereo'. We exploit the presence of colourful mutual illumination in an environment to recover the shape of objects from a single i

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3

Pocino, Yuste Andrea. "Cosmology with photometric redshift." Doctoral thesis, Universitat Autònoma de Barcelona, 2020. http://hdl.handle.net/10803/671733.

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Els cartografiats de galàxies fotomètrics actuals i futurs observaran un gran volum de l’univers que ens permetrà acotar amb precisió el model cosmològic. Tanmateix, la capacitat de delimitar el model que tenen aquests cartografiats a través de les sondes cosmològiques depèn de la precisió i certesa amb les que es determina el redshift de les galàxies. Per tant, la determinació del redshift fotomètric i els seus efectes en les anàlisis cosmològiques han de ser tractats i estudiats curosament. En la primera part de la tesi, transformem la fotometria de simulacions que ja existeixen per imitar

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4

Bezanson, Rachel, David A. Wake, Gabriel B. Brammer, et al. "LEVERAGING 3D-HST GRISM REDSHIFTS TO QUANTIFY PHOTOMETRIC REDSHIFT PERFORMANCE." IOP PUBLISHING LTD, 2016. http://hdl.handle.net/10150/621218.

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We present a study of photometric redshift accuracy in the 3D-HST photometric catalogs, using 3D-HST grism redshifts to quantify and dissect trends in redshift accuracy for galaxies brighter than JH(IR) > 24 with an unprecedented and representative high-redshift galaxy sample. We find an average scatter of 0.0197 +/- 0.0003(1 + z) in the Skelton et al. photometric redshifts. Photometric redshift accuracy decreases with magnitude and redshift, but does not vary monotonically with color or stellar mass. The 1 sigma scatter lies between 0.01 and 0.03 (1 + z) for galaxies of all masses and colors

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5

Blake, R. Melvin. "Photometric decomposition of NGC 6166." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq22790.pdf.

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6

Silva, Fernández Simón Yeco. "Photometric Redshifts in the HDFS." Tesis, Universidad de Chile, 2015. http://repositorio.uchile.cl/handle/2250/133104.

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Magíster en Ciencias, Mención Astronomía<br>Se presenta fotometría óptica en 11 bandas medias a partir de observaciones realizadas con el telescopio de 2.2m en LSO (WFI) sobre un campo de ~30'×30' deg extendido en el Hubble Deep Field-South (EHDF-S), el cual es uno de los campos que contiene información en multibandas como parte del Multiwavelength Survey by Yale-Chile (MUSYC). Este campo tiene una gran cantidad de datos públicos y datos auxiliares en bandas UV, óptico, infrarrojo cercano e infrarrojo lejano. Se determinaron aperturas óptimas para fotometría de alta precisión para diversas fue

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7

Campisi, Andrea. "Development of a photometric stereo system." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2018.

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Photometric stereo is a method of estimating surface geometry by using a fixed-position camera and multiple light sources. The idea of photometric stereo is to vary the direction of incident illumination between successive images, while the viewing direction is constant; in this way, the correspondence of image points is known beforehand, as the position of the object is not changed, and surface orientation is determined by using the radiance values recorded with the different images. Photometric stereo has several applications: it is used to detect small surface defects, imperceptible to the

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8

Samaddar, Debasmita. "Photometric variability of three brown dwarfs." Access to citation, abstract and download form provided by ProQuest Information and Learning Company; downloadable PDF file 2.24 Mb., 65 p, 2006. http://proquest.umi.com/pqdlink?did=1075713471&Fmt=7&clientId=8331&RQT=309&VName=PQD.

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9

Buyukatalay, Soner. "Photometric Stereo Considering Highlights And Shadows." Phd thesis, METU, 2011. http://etd.lib.metu.edu.tr/upload/12613749/index.pdf.

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Three dimensional (3D) shape reconstruction that aims to reconstruct 3D surface of objects using acquired images, is one of the main problems in computer vision. There are many applications of 3D shape reconstruction, from satellite imaging to material sciences, considering a continent on earth or microscopic surface properties of a material. One of these applications is the automated firearm identification that is an old, yet an unsolved problem in forensic science. Firearm evidence matching algorithms rely on the fact that a firearm creates characteristic marks on surfaces of the bullets and

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10

Botzler, Christine S. "Finding Structures in Photometric Redshift Surveys." Diss., lmu, 2004. http://nbn-resolving.de/urn:nbn:de:bvb:19-22187.

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11

McMenemy, K. R. "Photometric evaluation of aerodrome ground lighting." Thesis, Queen's University Belfast, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.273182.

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12

Berntsson, Robin. "Photometric stereo for eye tracking imagery." Thesis, Linköpings universitet, Medie- och Informationsteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-139019.

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The goal of this work is to examine the possibility of surface reconstruction from the images produced by the Tobii H5 eye tracker. It starts of by examining classic photometric stereo and its limitations under the illuminator conﬁguration of the eye tracker. It then proceeds to investigate two alternative solutions: photometric stereo under the assumption that the albedo is known and a method that uses the images from the eye tracker as a guide to mold a reference model into the users face. In the second method the pose of the reference model is estimated by minimizing a photometric error und

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13

Howell, Steve Bruce. "Photometric observations of faint cataclysmic variables." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 1995. http://dare.uva.nl/document/92246.

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14

Regnault, Nicolas. "Photometric Calibration of Wide Field Imagers." Habilitation à diriger des recherches, Université Pierre et Marie Curie - Paris VI, 2013. http://tel.archives-ouvertes.fr/tel-01045107.

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Cette thèse d'habilitation consiste en trois petits articles de revue indépendants, couvrant mes activités passées au sein du groupe de cosmologie du LPNHE. Le premier chapitre est consacré à la mesure de l'histoire de l'expansion cosmique avec des supernovae de type Ia (SNe Ia). Les techniques de détermination de distance de luminosité mises en oeuvre au sein du Supernova Legacy Survey (SNLS) sont détaillées. Les résultats de l'analyse des trois premières années de données du SNLS sont présentés. Le second chapitre traite d'un ingrédient essentiel de ce type d'analyse, à savoir la calibration

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15

Hansen, Mark F. "3D face recognition using photometric stereo." Thesis, University of the West of England, Bristol, 2012. http://eprints.uwe.ac.uk/16754/.

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Automatic face recognition has been an active research area for the last four decades. This thesis explores innovative bio-inspired concepts aimed at improved face recognition using surface normals. New directions in salient data representation are explored using data captured via a photometric stereo method from the University of the West of England’s “Photoface” device. Accuracy assessments demonstrate the advantage of the capture format and the synergy offered by near infrared light sources in achieving more accurate results than under conventional visible light. Two 3D face databases have

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16

Van, Heerden Hendrik Petrus. "Robotic control of a photometric telescope." Master's thesis, University of Cape Town, 2011. http://hdl.handle.net/11427/11399.

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The objective of this project was to design and implement the telescope control software for the Alan Cousins Telescope (ACT), a robotic telescope at the Sutherland, South Africa, site of the South African Astronomical Observatory (SAAO). The approach adopted involved a high level of modularisation of the software and the use of software simulators in an effort to foster rapid software development and enable more rigorous software testing. Significant attention was also paid to new and emerging technologies and how these may be used within the specific context of robotic telescope control soft

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17

St, Germaine Michael Tyler. "Improving Photometric Redshift Measurements Using BPZ." Thesis, The University of Arizona, 2013. http://hdl.handle.net/10150/297785.

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Redshift measurements are used in astrophysics to measure distances and to constrain fundamental cosmological quantities. Although spectroscopic redshifts (spec-z) are much more reliable than photometric redshifts (photo-z), they are much more difficult or time-consuming to obtain. We seek to optimize photo-z measurements, i.e. bring their values closer to the "true" spec-z values, by using a tool called BPZ. We investigate the changes in photo-z resulting from modified galaxy templates using the SDSS catalogue of galaxies. We also consider the effect of adding artificial noise to galaxy spect

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18

Yang, Qian, Xue-Bing Wu, Xiaohui Fan, et al. "Quasar Photometric Redshifts and Candidate Selection: A New Algorithm Based on Optical and Mid-infrared Photometric Data." IOP PUBLISHING LTD, 2017. http://hdl.handle.net/10150/627092.

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We present a new algorithm to estimate quasar photometric redshifts (photo-zs), by considering the asymmetries in the relative flux distributions of quasars. The relative flux models are built with multivariate Skew-t distributions in the multidimensional space of relative fluxes as a function of redshift and magnitude. For 151,392 quasars in the SDSS, we achieve a photo-z accuracy, defined as the fraction of quasars with the difference between the photo-z z(p) and the spectroscopic redshift z(s), vertical bar Delta z vertical bar=vertical bar z(s)-z(p)vertical bar/(1 + z(s)) within 0.1, of 74

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19

Domeniconi, Federico. "Deep Learning Techniques applied to Photometric Stereo." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2020. http://amslaurea.unibo.it/20031/.

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La tesi si focalizza sullo studio dello stato dell’arte della fotometria stereo con deep learning: Self-calibrating Deep Photometric Stereo Networks. Il modello è composto è composto di due reti, la prima predice la direzione e l’intensità delle luci, la seconda predice le normali della superficie. L’obiettivo della tesi è individuare i limiti del modello e capire se possa essere modifcato per avere buone prestazioni anche in scenari reali. Il progetto di tesi è basato su fine-tuning, una tecnica supervisionata di transfer learning. Per questo scopo un nuovo dataset è stato creato acquisendo i

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20

Borstad, Eriksen Martin. "Cross-correlating spectroscopic and photometric galaxy surveys." Doctoral thesis, Universitat Autònoma de Barcelona, 2014. http://hdl.handle.net/10803/133261.

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En esta tesis se estudia el acotamiento en los paraámetros cosmología al combinar observaciones en catálogos de galaxias espectroscópicas y fotométricos. Los catálogos fotométricos miden las distorsiones de lente gravitacional débil (WL), mientras que los catalogos espectroscópicos, con más alta precisión en la información de redshift (o corriento al rojo), son ideales para el estudio de distorsiones espaciales de redshift (RSD). El análisis combinado se realiza únicamente com funciones de correlación angular, lo que simplifica el estudio, en particular en lo que respecta a la inclusi

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21

Alarcon, Gonzalez Alex. "Higher resolution photometric redshifts for cosmological surveys." Doctoral thesis, Universitat Autònoma de Barcelona, 2019. http://hdl.handle.net/10803/669762.

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Aquesta tesi doctoral està centrada en la mesura del desplaçament al vermell (redshift) fotomètric en cartografiats de galàxies fotogràfiques i en les seves aplicacions per a extreure informació cosmològica. En la primera part d'aquesta tesi fem un pronòstic amb la tècnica de matrius de Fisher per a un cartografiat de galàxies que tingui mesures molt precises del redshift fotomètric - que poden venir tant d'espectroscòpia com de múltiples fotografies amb filtre estret. Fem servir correlacions angulars de galàxies, és a dir, com es distribueixen espacialment les galàxies, dividint una mostra

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22

Lopéz-Cruz, Omar. "Photometric properties of low-redshift galaxy clusters." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp02/NQ27999.pdf.

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23

Sethuram, Amrutha Shree. "Reconstruction of Lambertian Surfaces from Photometric Stereo." NCSU, 2005. http://www.lib.ncsu.edu/theses/available/etd-03142005-133624/.

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The objective of this thesis is to implement and compare two algorithms to reconstruct the shape of an object from photometric stereo. Photometric stereo is a practical technique for determining an object?s shape and surface reflectance properties at a distance. The implementation proposes the use of three images of an object, recorded from the same viewpoint but with different illumination. The first algorithm employs the Fourier transform method to solve the minimization problem. The gradient data is obtained by incorporating photometric stereo method on image triplets. The Fourier transform

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24

Stokman, Harro. "Robust photometric invariance in machine color vision." [S.l. : Amsterdam : s.n.] ; Universiteit van Amsterdam [Host], 2000. http://dare.uva.nl/document/56969.

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25

Babusiaux, Carine. "Photometric studies of the Milky Way Galaxy." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615732.

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26

Farooq, Abdul Rehman. "Dynamic photometric stereo for complex surface analysis." Thesis, University of the West of England, Bristol, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.409451.

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27

McAllister, Martin J. "Photometric mass determinations of eclipsing cataclysmic variables." Thesis, University of Sheffield, 2017. http://etheses.whiterose.ac.uk/19647/.

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Cataclysmic variables (CVs) are a type of close, interacting binary system containing a white dwarf primary and a low-mass, Roche lobe-filling secondary/donor. Mass is commonly transferred from the donor to an accretion disc around the white dwarf, due to the conservation of angular momentum, before eventually reaching the surface of the white dwarf. A region of increased luminosity, termed the 'bright spot', exists at the intersection of accretion disc and mass transfer stream. The transfer of mass within the system is a turbulent process, giving rise to random photometric variations commonly

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28

Cuesta, Contreras Angel. "Geometric and photometric affine invariant image registration." Thesis, Heriot-Watt University, 2009. http://hdl.handle.net/10399/2228.

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This thesis aims to present a solution to the correspondence problem for the registration of wide-baseline images taken from uncalibrated cameras. We propose an affine invariant descriptor that combines the geometry and photometry of the scene to find correspondences between both views. The geometric affine invariant component of the descriptor is based on the affine arc-length metric, whereas the photometry is analysed by invariant colour moments. A graph structure represents the spatial distribution of the primitive features; i.e. nodes correspond to detected high-curvature points, whereas a

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29

Li, Boren. "Photometric stereo for micro-scale shape reconstruction." Diss., Virginia Tech, 2017. http://hdl.handle.net/10919/75021.

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This dissertation proposes an approach for 3D micro-scale shape reconstruction using photometric stereo (PS) with surface normal integration (SNI). Based on the proposed approach, a portable cost-effective stationary system is developed to capture 3D shapes in the order of micrometer scale. The PS with SNI technique is adopted to reconstruct 3D microtopology since this technique is highlighted for its capability to reproduce fine surface details at pixel resolution. Furthermore, since the primary hardware components are merely a camera and several typical LEDs, the system based on PS with SNI

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30

Bakthavatchalam, Manikandan. "Utilisation of photometric moments in visual servoing." Thesis, Rennes 1, 2015. http://www.theses.fr/2015REN1S057/document.

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Cette thèse s'intéresse à l'asservissement visuel, une technique de commande à retour d'information visuelle permettant de contrôler le mouvement de systèmes équipées de caméras tels que des robots. Pour l'asservissement visuel, il est essentiel de synthétiser les informations obtenues via la caméra et ainsi établir la relation entre l'évolution de ces informations et le déplacement de la caméra dans l'espace. Celles-ci se basent généralement sur l'extraction et le suivi de primitives géométriques comme des points ou des lignes droites dans l'image. Il a été montré que le suivi visuel et les m

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31

Osborn, Hugh P. "Long-period exoplanets from photometric transit surveys." Thesis, University of Warwick, 2017. http://wrap.warwick.ac.uk/98252/.

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Photometric transit surveys on the ground & in space have detected thousands of transiting exoplanets, typically by analytically combining the signals from multiple transits. This technique of exoplanet detection was exploited in K2 to detect nearly 200 candidate planets, and extensive follow-up was able to confirm the planet K2-110b as a 2:6 0:1R , 16:7 3:2M planet on a 14d orbit around a K-dwarf. The ability to push beyond the time limit set by transit surveys to detect long-period transiting objects from a single eclipse was also studied. This was performed by developing a search technique

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32

Davies, John Keith. "Photometric monitoring of early type emission line stars." Thesis, University of Central Lancashire, 1988. http://clok.uclan.ac.uk/20181/.

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A programme of simultaneous optical (UBVRI) and infrared (JHKL MNQ) photometry of early type, emission line, stars is described. Particular emphasis is placed on observations of suspected pre-main-sequence objects such as Herbig Ae/Be stars. The observations, together with data from the IRAS point source catalogue, are analysed to probe the circumstellar environments of these objects and to determine the extent and causes of optical variability in such stars. It was found that many of these stars are associated with warm circumstellar dust and that the mean temperature of that dust is higher t

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33

Etherington, James Daniel Lambert. "Measuring galaxy environment in large scale photometric surveys." Thesis, University of Portsmouth, 2016. https://researchportal.port.ac.uk/portal/en/theses/measuring-galaxy-environment-in-large-scale-photometric-surveys(acd86f3b-67cd-4684-8d88-e49bb54790c6).html.

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The properties of galaxies, such as the galaxy red fraction and galaxy stellar mass function, have been shown to depend upon their environment in the local Universe. Large scale photometric surveys such as the DES and in the future Euclid, will be vital to gain insight into the evolution of galaxy properties and the role of environment through cosmic time. Large samples come at the cost of redshift precision and this affects the measurement of galaxy environment. In this thesis an analysis pipeline is constructed to derive galaxy parameters including absolute magnitudes, stellar masses and gal

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34

Barsky, S. "Surface shape and colour reconstruction using photometric stereo." Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/842858/.

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This thesis is on the use of a surface reconstruction method called Photometric Stereo in Machine Vision. In the first part we propose a modification of the method which allows one to reconstruct the shape and colour of the surface in the presence of highlights and shadows. We also provide an extensive error analysis of the algorithm, concentrating on design issues such as choice of thresholds. The second part of the thesis is on the subject of illumination direction invariant classification of 3-dimensional textures. Using Photometric Stereo, one can reconstruct the surface shape and infer it

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35

Wu, Tai-Pang. "From dense photometric stereo to interactive 3D markup /." View abstract or full-text, 2007. http://library.ust.hk/cgi/db/thesis.pl?CSED%202007%20WU.

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36

Lawrie, Katherine Anne. "Photometric variability and rotation in magnetic white dwarfs." Thesis, University of Leicester, 2013. http://hdl.handle.net/2381/28179.

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This thesis explores the photometric variability in isolated magnetic white dwarfs (MWDs) to search for spin periods. Approximately 40% of MWDs exhibit photometric modulations as the star rotates due to the effects from a strong magnetic field or star spots. A sample of 77 MWDs is studied to discover periods on timescales of minutes to one week. Well-defined periods are determined in 12 MWDs, with periods of roughly an hour to a few days, and variability with poorly constrained periods is found in a further 13 stars. MWD spin periods can provide important constraints for their post main-sequen

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Forne, Christopher Jes. "3-D Scene Reconstruction from Multiple Photometric Images." Thesis, University of Canterbury. Electrical and Computer Engineering, 2007. http://hdl.handle.net/10092/1227.

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This thesis deals with the problem of three dimensional scene reconstruction from multiple camera images. This is a well established problem in computer vision and has been significantly researched. In recent years some excellent results have been achieved, however existing algorithms often fall short of many biological systems in terms of robustness and generality. The aim of this research was to develop improved algorithms for reconstructing 3D scenes, with a focus on accurate system modelling and correctly dealing with occlusions. With scene reconstruction the objective is to infer scene p

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38

Scott, Christopher John Piers. "Indirect photometric determination of polar solutes by HPLC." Thesis, University of Bristol, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327903.

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Tsiotsios, Chourmouzios. "Shape estimation in murky water using photometric stereo." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/57033.

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Photometric stereo offers the possibility of object shape reconstruction via reasoning about the amount of light reflected from oriented surfaces. However, in murky media such as sea water light interacts not only with the scene but also with the medium particles. The resulting image formation model is complex and hard to optimize directly for scene orientation and albedo. The effectiveness of previous solutions has been limited since they were based on unrealistic assumptions about the imaging conditions or on external hardware for estimating some of the unknown model variables. In this thesi

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Collister, Adrian Ashley. "Galaxy clustering with spectroscopic and photometric redshift surveys." Thesis, University of Cambridge, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.613869.

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Lee, Ki Won. "A photometric survey of the Small Magellanic Cloud." Thesis, University College London (University of London), 2005. http://discovery.ucl.ac.uk/1446424/.

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The initial mass function (IMF) is defined as the fraction or number of stars born per unit mass interval and is the one of key parameters in astronomy. Since Salpeter (1955)'s work, there have been many studies, and most of them show the universality of the IMF regardless of systems, mass ranges, and metallicity within observational errors, although recently there are some suggestions of its variation. The main aim of this thesis is to test the IMF universality, based on a photometric study of the SMC. In order to study the IMF of massive stars and the star formation history, we perform a BVR

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42

Fiedorowicz, Pier Alexander, and Pier Alexander Fiedorowicz. "Reducing Photometric Redshift Uncertainties Using Galaxy Clustering Information." Thesis, The University of Arizona, 2017. http://hdl.handle.net/10150/624981.

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In cosmology and astronomy, measuring the distances to galaxies is an important task. This is done by measuring the redshift of the spectra from these sources. Photometric redshifts are a quick way of estimating the true redshifts and are calculated using color band intensities. The errors on these measurements produce an apparent anisotropy in the radial direction. One of our fundamental assumptions in cosmology is that the universe is isotropic. The ultimate goal of this project is to recover isotropy in the photometric redshift data. This is done using Bayesian statistical inference to

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Drory, Niv. "A near-infrared selected photometric survey of distant galaxies." Diss., lmu, 2002. http://nbn-resolving.de/urn:nbn:de:bvb:19-2849.

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Allyn, M. Liz. "Indirect photometric chromatography of iodide ion in aqueous solutions /." Online version of thesis, 1987. http://hdl.handle.net/1850/8769.

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Unger, Jonas, Stefan Gustavson, and Anders Ynnerman. "High Dynamic Range Video for Photometric Measurement of Illumination." Linköpings universitet, Visuell informationsteknologi och applikationer, 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-40069.

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We describe the design and implementation of a high dynamic range (HDR) imaging system capable of capturing RGB color images with a dynamic range of 10,000,000 : 1 at 25 frames per second. We use a highly programmable camera unit with high throughput A/D conversion, data processing and data output. HDR acquisition is performed by multiple exposures in a continuous rolling shutter progression over the sensor. All the different exposures for one particular row of pixels are acquired head to tail within the frame time, which means that the time disparity between exposures is minimal, the entire f

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46

DeCocq, John D. "The impact of abundance variations on photometric luminosity indicators." Virtual Press, 1996. http://liblink.bsu.edu/uhtbin/catkey/1014853.

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Red dwarf stars are one proposed solution to the dark matter problem in the Milky Way Galaxy These cool, low luminosity stars are difficult to detect and segregate in surveys. This study utilizes photometric data obtained on the Kron-Cousins photometric system to develop criteria that classifies stars as red. Two of the color indices are then used to create a two-color diagram to allow separation of giant and dwarf stars. An algorithm based on calculated equations is provided to separate the giant and dwarf stars after detection. A third class of stars, subdwarfs, is addressed as a potential p

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Spence, Andrew D. "Calibrated and uncalibrated photometric stereo for surface texture acquisition." Thesis, Heriot-Watt University, 2005. http://hdl.handle.net/10399/235.

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Soo, John Yue Han. "Enhancing photometric redshifts for the era of precision cosmology." Thesis, University College London (University of London), 2018. http://discovery.ucl.ac.uk/10055277/.

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Photometric redshifts (photo-z's) are vital for the success of current and forthcoming cosmological galaxy surveys. This work focuses on three different approaches to enhance photo-z's. Firstly, we study the extent to which galaxy morphology improves photo-z's. Using artificial neural networks, we compare the performances of several morphological parameters and find that galaxy size and surface brightness bring about the most improvement to photo-z's in bright samples. When multiple morphological parameters are used, the improvement in scatter reaches as high as 12% for the Main Galaxy Sample

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49

Eminian, Celine. "Photometric redshifts and physical properties of low redshift galaxies." Thesis, University of Sussex, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.496929.

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In this thesis we are interested in the properties of low redshift galaxies. In the first part, we look at the large-scale structure of the Sloan Digital Sky Survey galaxies using photometric redshifts. In the second part, we bring new insight into physical properties of galaxies, in particular into their dust content, and show how they are related to their near-infrared colours.

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50

La, Forgia Fiorangela. "Photometric analysis of asteroids and comets from space observations." Doctoral thesis, Università degli studi di Padova, 2014. http://hdl.handle.net/11577/3424608.

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The European space mission Rosetta, during its still ongoing journey to the comet 67P/Churyumov-Gerasimenko, on 10 July 2010 made an intermediate stop flying close to the asteroid 21 Lutetia at a distance of less than 3200 km and observed it from a varying observing point, otherwise inaccessible from Earth. Less than four months later, on 4 November 2010, the EPOXI mission, extension of the NASA Deep Impact mission, offered another unexpected opportunity approaching the small hyperactive Jupiter family comet 103P/Hartley 2 a few days after its perihelion passage at a distance of less than 700

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