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1
Wellige, Rainer. "Elemente der illuminatischen Ideologie in einigen vorklassischen Werken von Goethe und Schiller." Thesis, McGill University, 1998. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=21277.
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This Master's thesis analyses the connection between the Illuminati ideology and the sociopolitical ideals contained in pre-classical works---contemporary to the existence of the order---of Johann Wolfgang Goethe and Friedrich Schiller. The first chapter examines the creation, the development and the eventual collapse of the Illuminati Secret Society (Geheimbund der Illuminaten) founded in 1776 by Adam Weishaupt in the context of the Enlightenment. The second chapter explores the ideological similarities between the young Goethe and this secret society through the analysis of his works Gotz von Berlichingen (1771--1773), Egmont (1775--1784) and Der Gross Cophta (1791). The third chapter expounds Schiller's ideological opinion of the Illuminati through Don Carlos (1787), and discusses their republican visions of freedom and human rights. The conclusion integrates the findings made in each chapter and demonstrates, through both authors' discussed works, the similar ideals of both authors and Illuminism.
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2019. https://dc.etsu.edu/illuminated/16.
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From the School of Graduate Studies; Going All In [Dr. Matthew McGahey, Ed.D. Global Sport Leadership]; Where Are They Now? [Rob Cantor & Dr. Sharon McGee]; Letters from the Past [Emily Lu, M.A. History]; Where Are They Now? [Featuring: Maura Bishop & Bradley Marshall]; Empowering Students to Take Control [Ziyad Alrumayh, M.Ed. Special Education]; Research Grant Recipients, 2018; Where Are They Now? [Featuring: Ernest Eugene & Matthew Harrison]; A Link to Your legacy [Lee Ann Davis, Director for University Alumni Programs]; Where Are They Now? [Featuring: Tiffany Hogan & Thomas Roddy]; Understanding the Value of Identity in Healthy Behaviors [Byron Brooks, Ph.D. Psychology]; Where Are They Now? [Featuring: Lindsay Toman & Shelby Morris]; Necessity, the Mother of New Understanding [Jack Hartsell, M.S. Mathematical Sciences]; Narrators of Grief; Giving Nigerian Widows’ Voice [Esosa Mohammed, M.A. Liberal Studies]https://dc.etsu.edu/illuminated/1000/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2018. https://dc.etsu.edu/illuminated/1.
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From the School of Graduate Studies; Hailing the Future [Edward Hall, Applied Computer Science, M.S.]; The Effects of "Bath Salts" on the Brain [Serena Allen, Biomedical Sciences, Ph.D., Backing Up the Unsung Heroes of Appalachian Education [Drs. Fox, Mims, Baroszuk with Olakunle Joseph Oni]; Caring for a Performer's "Instrument" [Heather Smith, Speech-Language Pathology, M.S.]; Where Are They Now? [Lawence Loving, Jenna Middlebrooks, and Jami Winstrom]; Tudo Roses, Milanese Mercenaries, and the Laws They Manipulated to Maintain Power [Heather Alexander, History, M.A.]; Positive Deviance: An Assests-Based Approach to Solving Health Disparities [Olivia Egen, Community Health, Dr.PH]; The Pure Math Behind Brands [Andrew Sweeney, Mathematical Sciences, M.S.], ETSU Student Receives TCGS Award [MD Salman Ahmed]https://dc.etsu.edu/illuminated/1001/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2017. https://dc.etsu.edu/illuminated/15.
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From the School of Graduate Studies; Nordic Noir [Bradley Hartsell English, M.A.]; Research Grant Recipients [Shina Bhatia, Byron Brooks, Jesse D. Daniel, Wesley Drew Gill, Jesi Hall, Joseph Kusi, Areej Mosa, Claiborne Daniel Sea]; Where Are They Now? [Olushola Aromona Professional Communications, M.A., 2016]; Where Are They Now? [Nathan Cunningham Public Health, M.P.H., 2014]; The Appalachian Student Research Forum- Dipping A Toe Into The Pool Of Academia; Where Are They Going? [Maike Klein Counseling, M.A., 2017]; Where Are They Now? [Russell Ingram Biology, M.S. (Biology), 2013]; The Balancing Act [Elizabeth Hall Clinical Nutrition, M.S.]; Where Are They Going? [Vijay Tiwari Biology, M.S. (Biology), 2016]; Where Are They Now? [Jeni Hunniecutt Professional Communication, M.A., 2013]; Opening Communication Between Health Care Providers And Patients [Stephanie Mathis, Community Health, Dr.P.H.]; Inside the Minds of Spiders [Rebecca Wilson Biological Sciences, Ph.D.]; Where Are They Now [Rickey Bump Art, M.F.A. (Studio Art), 2016]https://dc.etsu.edu/illuminated/1002/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2016. https://dc.etsu.edu/illuminated/3.
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From the School of Graduate Studies; Research Grant Award Recipients; Cesium Adsorption in the Environment [Kenneth Seaton Chemistry, M.S.]; Social Media and Health Information [Anthony Peluso Public Health, M.P.H]; Where Are They Now? [Samuel Kakraba Mathematical Sciences, M.S., 2015 Colton Watts Biology, M.S., 2014]; The Forgotten Law Enforcement Officers [Caitlin Botelho, Sociology, M.A.]; Asking the Right Questions [Jedaidah Chilufya Biology, M.S]; Where Are They Now? [Saundra Reynolds Liberal Studies, M.A.L.S., 2016 Kathleen Klik Psychology, Ph.D., 2015]; The Epidemiology of Hepatitis C [Yang Chen Public Health, Dr.P.H]; Criminal Justice and Sex Offenders [Maria Aparcero-Seuro Criminal Justice and Criminology, M.A.]; Student Affairs: Putting Students First [Dr. Joe Sherlin Vice President for Student Affairs, Dr. Jeff Howard Associate Vice President for Student Engagement, Dr. Michelle Byrd Associate Dean of Student]; Where Are They Now? [Tonya Hensley Nursing, D.N.P., 2014]https://dc.etsu.edu/illuminated/1004/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2015. https://dc.etsu.edu/illuminated/5.
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From the School of Graduate Studies; Where Are They Now? [Featuring Wendee White, Ariel Ford, Dr. Gene Couch & Tasha Keys]; Planning for Success [Dr. Wendy Doucette Graduate Studies Librarian]; Oregon’s Right to Choose: Decisions About Dying with Dignity [Sociology, M.A. Graduate Student: Erin Mauck]; When Pathogens Don’t Share Well: Exploring How Chlamydial Infections Prevent Herpes Virus Disease [Biomedical Sciences, Ph.D. Graduate Student: Jessica Slade]; Improving Education Through Research [Elementary Education, M. Ed. Graduate Student: Kelly Stapleton]; Controlling Lipid Synthesis [Biomedical Sciences, Ph.D. Graduate Student: Muhammad Mahbubur Rahman]; English [English, M.A. Graduate Student: Inga Sarkodie]; The Mechanism of Atr and Cancer Research [Biomedical Sciences, Ph.D. Graduate Student: Benjamin Hilton]; Monstrous-Femininity: Reevaluating the Lawrentian Woman [English, M.A. Graduate Student: Dusty Brice]; Research Grant Awardshttps://dc.etsu.edu/illuminated/1006/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2014. https://dc.etsu.edu/illuminated/7.
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Where Are They Now? [Geoff Adebonojo & Marla Perna]; Evidence from the Earth: Researching Cranial Material of Mio-Pliocene Salamanders at the Gray Fossil Site [Geosciences, M.S. (Paleontology) Graduate Student: Hannah Darcy]; Healthy Plant-Based Fats: An Ongoing Exploration of Triacylglycerol Oil Accumulation in Plants [Biology, M.S. (Biology) Graduate Student: Parker Dabbs]; ETSU Housing and Residence Life [Dr. Bonnie Burchett]; The Creative Process: Paintings Inspired by History and Connectivity [Art, M.F.A. (Studio Art) Graduate Student: Katherine Block]; Maternal and Child Health: Informing and Encouraging Healthy Families [Public Health, Dr.P.H. (Epidemiology) Graduate Student: Marc Stevens, Jr.]https://dc.etsu.edu/illuminated/1008/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2013. https://dc.etsu.edu/illuminated/10.
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The Tennessee Military Maneuvers of 1941 [History, M.A. Graduate Student: Joshua Savage]; Creating New Technology at ETSU to Help Monitor Volcanoes [Geosciences, M.S. (Geospatial Analysis Concentration) Graduate Student: Richard Freeman]; Meet Your Personal Librarian; Where Are They Now? [Melissa Wilson]; Solving Puzzles with Algebra [Mathematical Sciences, M.S. Graduate Student: Amanda Justus]; Where Are They Now? [Raquel Fratta]; A Closer Look at Perceptions of Chinese Business [Professional Communication, M.A. Graduate Student: Xueyi LI]; Improving Care for Children with Cleft Lip & Palate [Communicative Disorders, M.S. (Speech Pathology Concentration)]; Where Are They Now? [Hilary Anne Gibson]https://dc.etsu.edu/illuminated/1011/thumbnail.jpg
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Studies, ETSU School of Graduate. "Illuminated Magazine." Digital Commons @ East Tennessee State University, 2012. https://dc.etsu.edu/illuminated/13.
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Art, M.F.A. (Studio Art Concentration) [Sculpting Conversation with Melisa Cadell Graduate Student: Melisa Cadell]; History, M.A. [Charting European Nationalism Graduate Student: John Wyatt Greenlee]; Where Are They Now? Computer and Information Sciences, M.S. (Information Technology Concentration) [Megan Bradley]; Psychology, Experimental Psychology Concentration, Ph.D. [the Effect of Self-Compassion and Mindfulness on Depression Graduate Student: Jessica Williamson]; Where Are They Now? English, M.A. [Sean Levenson]; Biomedical Sciences, Ph.D. [Searching for the off Switch in Cancer Cell Replication Graduate Student: Moises Serrano]; Clinical Nutrition, M.S. [Nutrition on the .Net Graduate Student: Courtney Mckinney]; Where Are They Now? Kinesiology and Sport Studies, M.A. (Exercise Physiology and Performance Concentration) [George Beckham]; Professional Communication, M.A. [Costume Design in the Digital Era Graduate Student: Christine Waxstein]https://dc.etsu.edu/illuminated/1014/thumbnail.jpg
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Rose, Kayla. "Illuminating Ireland : illuminated addresses and the material culture of Irish civic and national identity in the nineteenth and early twentieth centuries." Thesis, Ulster University, 2014. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.627629.
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This thesis explores the material culture of illuminated addresses in nineteenth and early twentieth-century Ireland as commemorative objects which concurrently exhibited Irish and British identity. It presents a history of the modern revival of illumination using the theoretical frameworks of material culture, art history, cultural history, anthropology and archaeology in order to determine the cultural, historical and socio-political value of illuminated addresses within the contexts of Romantic Nationalism, the Celtic Revival and modernity. The thesis reinvestigates the history of the revival of illumination in modern Ireland as it relates to the formation and expression of civic and national identity in the form of the illuminated address, and interrogates, as a case study, the art and printing firm of Marcus Ward & Co. and its chief artist and designer John Vinycomb within the larger civic development of Victorian Belfast, detailing their contributions to art, commerce and industry. As physical manifestations of Victorian and immediate post-Victorian and early modern identity, illuminated addresses were decorative, commemorative objects presented to people for significant achievements through public ceremony. The research questions associated with this thesis explore the material culture of illuminated addresses and conclude that illuminated addresses embodied, and were a key material part of expressing, Irish civic and national identity from the 1860s to the period immediately following Irish independence and partition, forming a major contribution to the study of material culture and art history in Ireland. It serves further as a recovery project in its construction of a history of forgotten objects.
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Brown, Sharon L. "Illumination." Thesis, This resource online, 1997. http://scholar.lib.vt.edu/theses/available/etd-09092008-064417/.
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Lindsay, Clifford. "Programmable Image-Based Light Capture for Previsualization." Digital WPI, 2013. https://digitalcommons.wpi.edu/etd-dissertations/88.
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Previsualization is a class of techniques for creating approximate previews of a movie sequence in order to visualize a scene prior to shooting it on the set. Often these techniques are used to convey the artistic direction of the story in terms of cinematic elements, such as camera movement, angle, lighting, dialogue, and character motion. Essentially, a movie director uses previsualization (previs) to convey movie visuals as he sees them in his "minds-eye". Traditional methods for previs include hand-drawn sketches, Storyboards, scaled models, and photographs, which are created by artists to convey how a scene or character might look or move. A recent trend has been to use 3D graphics applications such as video game engines to perform previs, which is called 3D previs. This type of previs is generally used prior to shooting a scene in order to choreograph camera or character movements. To visualize a scene while being recorded on-set, directors and cinematographers use a technique called On-set previs, which provides a real-time view with little to no processing. Other types of previs, such as Technical previs, emphasize accurately capturing scene properties but lack any interactive manipulation and are usually employed by visual effects crews and not for cinematographers or directors. This dissertation's focus is on creating a new method for interactive visualization that will automatically capture the on-set lighting and provide interactive manipulation of cinematic elements to facilitate the movie maker's artistic expression, validate cinematic choices, and provide guidance to production crews. Our method will overcome the drawbacks of the all previous previs methods by combining photorealistic rendering with accurately captured scene details, which is interactively displayed on a mobile capture and rendering platform.
This dissertation describes a new hardware and software previs framework that enables interactive visualization of on-set post-production elements. A three-tiered framework, which is the main contribution of this dissertation is; 1) a novel programmable camera architecture that provides programmability to low-level features and a visual programming interface, 2) new algorithms that analyzes and decomposes the scene photometrically, and 3) a previs interface that leverages the previous to perform interactive rendering and manipulation of the photometric and computer generated elements. For this dissertation we implemented a programmable camera with a novel visual programming interface. We developed the photometric theory and implementation of our novel relighting technique called Symmetric lighting, which can be used to relight a scene with multiple illuminants with respect to color, intensity and location on our programmable camera. We analyzed the performance of Symmetric lighting on synthetic and real scenes to evaluate the benefits and limitations with respect to the reflectance composition of the scene and the number and color of lights within the scene. We found that, since our method is based on a Lambertian reflectance assumption, our method works well under this assumption but that scenes with high amounts of specular reflections can have higher errors in terms of relighting accuracy and additional steps are required to mitigate this limitation. Also, scenes which contain lights whose colors are a too similar can lead to degenerate cases in terms of relighting. Despite these limitations, an important contribution of our work is that Symmetric lighting can also be leveraged as a solution for performing multi-illuminant white balancing and light color estimation within a scene with multiple illuminants without limits on the color range or number of lights. We compared our method to other white balance methods and show that our method is superior when at least one of the light colors is known a priori.
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Phiri, Aretha. "Illuminating chemistry." Rhodos, 2006. http://hdl.handle.net/10962/d1006407.
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Every year the Chemistry Department hosts a visiting lecturer for a week in memory of Professor William Francis Barker, former Professor of Chemistry in the Rhodes Chemistry Department (1925 -1961). This year's Barker Lecturer was Professor Mike Cook from the Department of Chemistry and Pharmaceutical Sciences at the University of East Anglia in Norwich, England. Professor Cook has an ongoing collaboration with Professor Tebello Nyokong in the Department of Chemistry in the field of phthalocyanine.
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Eckardt, Hella. "Illuminating Roman Britain." Thesis, University of Reading, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431077.
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Patel, Kartikey N. "Inspiration to Illumination." Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/33666.
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This thesis is the result of insights gained from
investigation of the work of Carlo Scarpa and
applied to the making of a lamp. Scarpaâ s work
has influenced this work in many ways but most
fascinating is the way detail is used. The
indirect connection between parts and blending of
precious and semiprecious metals conveys its own
language. Geometry, one of the governing aspects
of his design is a primary characteristic in the
composition of spaces. The way different metals
are used and the ways different spaces are created
are fundamental throughout his work. This project is
an attempt to make a lamp which is more than an
object. Different metals like steel, brass,
copper and aluminum are treated in extreme
conditions and the range of different materials
are part of a process. In the process of making,
the design has taken a few turns. An ongoing
dialogue with objects and an empirical process
of evaluating and analyzing past objects were
used to support the next decision. Often details
are designed on the spot in the shop. The Lamp
has had two reflectors. The design of the reflector
is part of an on going process. Although this
object may not be as functionally efficient as
other lamps, it has provided an opportunity for
discourse and acts as a vehicle for further
investigation. Many enjoyable moments are the
part of its qualified success and it has open up
a wide horizon of architectureal gesturing.Master of Architecture
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Eckardt, Hella. "Illuminating Roman Britain /." Montagnac : M. Mergoil, 2002. http://catalogue.bnf.fr/ark:/12148/cb39007842f.
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Castillo, Faune Luis Ernesto. "Improvements in illumination compensation for face recognition under noncontrolled illumination conditions." Tesis, Universidad de Chile, 2017. http://repositorio.uchile.cl/handle/2250/145204.
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Doctor en Ingeniería EléctricaFace recognition depends strongly on illumination conditions, especially in non-controlled scenarios where face illumination is not homogeneous. For this reason, illumination compensation is crucial in this task. Several methods for illumination compensation have been developed and tested on the face recognition task using international available face databases. Among the methods with best results are the Discrete Cosine Transform (DCT), Local Normalization (LN) and Self-Quotient Image (SQI). Most of these methods have been applied with great success in face recognition using a principal component classifier (PCA). In the last decade, Local Matching Gabor (LMG) classifiers have shown great success in face classification relative to other classifiers. In all cases, the illumination compensation methods improve the face recognition rates in unevenly illuminated images, but affect negatively in some well illuminated images. The aim of this thesis is to propose improvements to the current illumination compensation methods to obtain improved face recognition rates under different illumination conditions. Using genetic algorithms (GAs), parameters of the SQI method were selected to improve face recognition. The parameters optimized by the GA were: the fraction of the mean value within the region for the SQI, selection of Arctangent, Sigmoid, Hyperbolic Tangent or Minimum functions to eliminate noise, and the weight values of each filter are selected within a range between 0 and 1. The results obtained after using the proposed method were compared to those with no illumination compensation and to those previously published for SQI method. Four internationally available face databases were used: Yale B, CMU PIE, AR, Color FERET (grayscaled), where the first three contain face images with significant changes in illumination conditions, and the fourth one contains face images with small changes in illumination conditions. The proposed method performed better than SQI in images with non-homogeneous illumination. In the same way, GAs were used to optimize parameters of the modified LN and SQI methods in cascade for illumination compensation to improve face recognition. The main novelty of this proposed method is that it applies to non-homogeneous as well as homogeneous illumination conditions. The results were compared to those of the best illumination compensation methods published in the literature, obtaining 100% recognition on faces with non-homogeneous illumination and significantly better results than other methods with homogeneous illumination. Also, the DCT, LN, and SQI illumination compensation methods were optimized using GAs to be used with the LMG face classifier. Results were tested on the FERET international face database. Results show that face recognition can be significantly improved by modified versions of the current illumination compensation methods. The best results are obtained with the optimized LN method which yields a 31% reduction in the total number of errors in the FERET database. Finally, an extension of the LN method using Kolmogorov-Nagumo-based statistics was proposed to improve face recognition. The proposed method is a more general framework for illumination normalization and it was showed that LN is a particular case of this framework. The proposed method was assessed using two different classifiers, PCA and LMG, on the standard face databases Extended Yale B, AR and Gray FERET. The proposed method reached significantly better results than those previously published for other versions of LN on the same databases.
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Vacula, Daniel. "Automatizace metody měření povrchových struktur reflexním digitálním holografickým mikroskopem." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2010. http://www.nusl.cz/ntk/nusl-228893.
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Reflected-light digital holographic microscope developed at IPE FME BUT uses off-axis holography principle and low spatial and temporal coherence illumination. Microscope allows reconstruction of the image amplitude and the image phase, which can be handled in real time. The only limiting factors are imaging speed of the detector and computer performance when processing holograms. Reconstruction of image phase and amplitude allows high-resolution profilometric measurements in the vertical axis direction. This thesis deals with the automatization of profilometric measurement method proposed in [2]. Proposed method uses the combination of the image phase and the image amplitude for the measurement of specimens with surface structure the vertical size of which cause the uncertainty of the image phase by a factor of 2pí. Futher the thesis deals with the construction design of the illumination system of the microscope and its realization together with experimental verification of functionality of proposed method automatization.
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Appelt, Daniel. "Single-shot optical sectioning using polarised illumination coded structured illumination microscopy (picoSIM)." Thesis, King's College London (University of London), 2013. https://kclpure.kcl.ac.uk/portal/en/theses/singleshot-optical-sectioning-using-polarised-illumination-coded-structured-illumination-microscopy-picosim(825e59c9-6998-4acd-824b-7173ca670747).html.
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The conventional epi-uorescent wide-eld microscope features a uniform illumination of an extended sample region. A problem arises with this setup since light from outof-focus uorophores is also detected. The result is poor quality in the nal image, as out-of-focus structures appear blurred; furthermore, their emission light contributes to the background and leads to a reduction in image contrast. Removing out-of-focus light yields an optically sectioned image: a thin slice of a thick sample that only contains in-focus information. Taking a stack of such sectioned images allows for a three-dimensional (3D) view of the specimen. Structured illumination microscopy for sectioning (sSIM) is a method to obtain optically sectioned data, similar to that obtained from the widely used confocal microscope. However, sSIM suffers from a limited acquisition rate, as at least three individual raw images are needed to reconstruct one sectioned slice. The technique of polarised illumination coded structured illumination microscopy (picoSIM) combines optical sectioning with high temporal resolution. In picoSIM the individual light patterns needed to acquire the raw sSIM images are encoded in the polarisation of the illumination light. This enables the simultaneous acquisition of the data needed for the sSIM reconstruction, allowing optical sectioning with high acquisition rates. This thesis describes the theory of picoSIM and presents experimental results.
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Lior, Dan. "Computational terrain illumination problems." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape3/PQDD_0016/MQ53006.pdf.
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Rutgers, Andrew Ulrich. "Natural illumination invariant imaging." Thesis, University of British Columbia, 2011. http://hdl.handle.net/2429/33741.
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Shadows confound many machine vision algorithms and strong ambient illumination confounds active imaging, especially in outdoor automation applications such as surface mining. Natural Illumination Invariant Imaging takes images that appear to be illuminated by only an intentional flash, even with a flash only 1/37000th the power of the ambient light. This work combines hardware techniques, including brief pulses and filtering to reduce the apparent intensity of ambient light, with subtracting a reference image of the scene under only ambient illumination. Most existing techniques simply subtract an image of the scene taken at a previous time, or use several cameras to estimate the reference image. This work explores creating an accurate reference image using two cameras. The improved reference image for subtraction allows ambient shadows to be substantially removed from an image. Four experimental methods: reference estimation, segmentation, shadow removal and depth correlation; were used to evaluate the performance of ten techniques. Estimates of flash-free reference images created with the proposed techniques were compared to real images taken without a flash showed up to 63% reduction in error over existing techniques. The techniques were applied to three image processing methods: segmentation, shadow removal and depth correlation. They were applied to video for segmentation, and demonstrated segmenting an object 55% more accurately, though the measurement is scene dependent. Next, shadow ratio experiments examined the magnitude of the shadow remaining after subtraction, showing up to 70% shadow intensity removal. Depth correlation experiments showed over a 60% increase in the image area recognized using an efficient logical correlation algorithm. The theoretical performance of the techniques was examined. In summary, illumination invariant imaging was explored theoretically and experimentally, showing significant improvements for some important methods.
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Batur, Aziz Umit. "Illumination-robust face recognition." Diss., Georgia Institute of Technology, 2003. http://hdl.handle.net/1853/15440.
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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 image.
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Ramirez, Steve (Ramirez Moreno). "Illuminating the mental memoriam." Thesis, Massachusetts Institute of Technology, 2015. http://hdl.handle.net/1721.1/103205.
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Thesis: Ph. D., Massachusetts Institute of Technology, Department of Brain and Cognitive Sciences, 2015.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 212-230).
Memories thread and unify our overall sense of being. With the accumulation of our knowledge about how memories are formed, consolidated, retrieved, and updated, neuroscience has reached a point where brain cells active during these discrete mnemonic processes can be identified and manipulated at rapid timescales. Here, I begin with historical studies that lead to the modem memory engram theory. Then, I present our recent advances in memory research that combine transgenic and optogenetic approaches to reveal underlying neuronal substrates sufficient for activating mnemonic processes. Our studies' conclusions are threefold: (1) we provide proof of principle evidence demonstrating that learning-related neural changes can be isolated at the level of single cells, and that these cells can then be tagged for subsequent manipulation; (2) a defined subset of hippocampus cells are sufficient to elicit the neuronal and behavioral expression of memory recall, as well as sufficient to modify existing positive and negative memories; (3) and finally, artificially activated memories can be leveraged to acutely and chronically suppress psychiatric disease-related states. We propose that hippocampus cells that show activity-dependent changes during learning construct a cellular basis for contextual memory engrams and that directly activating these endogenous neuronal processes may be an effective means to correct maladaptive behaviors.
by Steve Ramirez.
Ph. D.
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Kuffner, Joshua A. "Illuminating the Sublime Ruin." University of Cincinnati / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1367941361.
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Kennedy-Quigley, Shanna Josephine. "Illuminating the Memphite Sarapieion." Diss., Restricted to subscribing institutions, 2008. http://proquest.umi.com/pqdweb?did=1610027861&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.
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Cornu, Catherine J. G. Hoffmann Michael R. "Photocatalysis under periodic illumination." Diss., Pasadena, Calif. : California Institute of Technology, 2002. http://resolver.caltech.edu/CaltechETD:etd-05082006-143046.
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Ramakrishnan, Rishi. "Illumination Invariant Outdoor Perception." Thesis, The University of Sydney, 2015. http://hdl.handle.net/2123/14522.
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This thesis proposes the use of a multi-modal sensor approach to achieve illumination invariance in images taken in outdoor environments. The approach is automatic in that it does not require user input for initialisation, and is not reliant on the input of atmospheric radiative transfer models. While it is common to use pixel colour and intensity as features in high level vision algorithms, their performance is severely limited by the uncontrolled lighting and complex geometric structure of outdoor scenes. The appearance of a material is dependent on the incident illumination, which can vary due to spatial and temporal factors. This variability causes identical materials to appear differently depending on their location. Illumination invariant representations of the scene can potentially improve the performance of high level vision algorithms as they allow discrimination between pixels to occur based on the underlying material characteristics. The proposed approach to obtaining illumination invariance utilises fused image and geometric data. An approximation of the outdoor illumination is used to derive per-pixel scaling factors. This has the effect of relighting the entire scene using a single illuminant that is common in terms of colour and intensity for all pixels. The approach is extended to radiometric normalisation and the multi-image scenario, meaning that the resultant dataset is both spatially and temporally illumination invariant. The proposed illumination invariance approach is evaluated on several datasets and shows that spatial and temporal invariance can be achieved without loss of spectral dimensionality. The system requires very few tuning parameters, meaning that expert knowledge is not required in order for its operation. This has potential implications for robotics and remote sensing applications where perception systems play an integral role in developing a rich understanding of the scene.
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Ricks, Brian C. "Graph-based Global Illumination." BYU ScholarsArchive, 2010. https://scholarsarchive.byu.edu/etd/2423.
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The slow render times of global illumination algorithms make them impractical in most commercial and academic settings. We propose a novel framework for calculating the computational complexity of global illumination algorithms and show that no other recent improvements have reduced this complexity. We further show that many algorithms use a tree as their rendering paradigm. We propose a new rendering algorithm, pipe casting, which calculates light paths using a graph instead of a tree. Pipe casting significantly reduces both computational complexity and actual render time of rendering. Using an L2 pixel-wise error comparison, on average our algorithm can render a variety of scenes at the same error as traditional algorithms but in about 50% of the time.
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Lošťák, Martin. "Programovatelná osvětlovací soustava pro optický mikroskop." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2008. http://www.nusl.cz/ntk/nusl-228217.
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A programmable illuminating system (PIS) uses a commercial multimedia projector together with a suitable optical relay system in order to illuminate specimens under microscope with transmitted light. The theoretical part of the diploma thesis describes some methods used in the optical transmission microscopy. All of these methods employ physical masks placed in the condenser front focal plane. In the case of the traditional methods the masks are used to enhance contrast (e.g. dark-field illumination) and resolution (oblique illumination). One of the methods (a condenser with rotating aperture) provides the information about the three-dimensionality of the specimen. The next part of the thesis contains the theory and the basic classification of the illuminating systems used in the optical transmission microscopy. An optical and mechanical design of the optical relay system used for PIS is introduced. The experimental part shows the results made with two different PIS arrangements. It was shown on two different specimens that the PIS provides the same illumination as the classical methods. It was also proved that the PIS can simulate the rotating aperture in the condenser front focal plane and thus to give the information about the three-dimensionality of the specimen. Some new static and dynamic illuminating methods were introduced.
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Beigpour, Shida. "Illumination and Object Reflectance Modeling." Doctoral thesis, Universitat Autònoma de Barcelona, 2013. http://hdl.handle.net/10803/113551.
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El modelado de la reflectancia de las superficies es una clave importante para la comprensión de escenas. Un modelo de reflectancia preciso, basado en las leyes de la física, nos permite alcanzar resultados realísticos y físicamente plausibles. Además, el uso de tal modelo nos permite establecer un conocimiento más profundo acerca de la interacción de la luz con las superficies de los objetos, y resulta crucial para una variedad de aplicaciones de visión por computador. Debido a la alta complejidad de los modelos de reflectancia, la gran mayoría de las aplicaciones existentes de visión por computador basan sus métodos en suposiciones simplificadoras, tales como la reflectancia lambertiana o la iluminación uniforme para ser capaz de resolver sus problemas.
Sin embargo, en escenas del mundo real, los objetos tienden a exhibir reflexiones más complejas (difusas y especulares), y además se ven afectados por las características y la cromaticidad de los iluminantes. En esta tesis, se incorpora un modelo de reflexión más realista para aplicaciones de visión por computador.
Para abordar tal fenómeno físico complejo, extendemos los modelos de reflectancia de los objetos del estado-del-arte mediante la introducción de un Modelo de Reflexión Dicromático Multi-Iluminante (MIDR). Usando MIDR somos capaces de modelar y descomponer la reflectancia de un objeto con especularidades complejas bajo múltiples iluminantes que presentan sombras e interreflexiones. Se demuestra que este modelo nos permite realizar una recolorización realista de los objetos iluminados por luces de colores y múltiples iluminantes.
Además se propone un método "local" de estimación del iluminante para modelar las escenas con iluminación no uniforme (por ejemplo, una escena al aire libre con un cielo azul y un sol amarillo, una escena interior con iluminación combinada con la iluminación al aire libre a través de una ventana, o cualquier otro caso en el que dos o más luces con diferentes colores iluminan diferentes partes de la escena). El método propuesto aprovecha un modelo probabilístico basado en grafos y resuelve el problema rededefiniendo la estimación como un problema de minimización de energía. Este método nos proporciona estimaciones locales del iluminante que mejoran en gran medida a los métodos del estado-del-arte en constancia de color.
Por otra parte, hemos capturado nuestro propia base de datos multi-iluminante, que consiste de escenas complejas y condiciones de iluminación al aire libre o de laboratorio. Con ésta se demuestra la mejora lograda usando nuestro método con respecto a los métodos del estado-del-arte para la estimación automática del iluminante local.
Se demuestra que tener un modelo más realista y preciso de la iluminación de la escena y la reflectancia de los objetos, mejora en gran medida la calidad en muchas tareas de visión por ordenador y gráficos por computador. Mostramos ejemplos de mejora en el balance automático de blanco, reiluminación de escenas y en la recolorización de objetos. La teoría propuesta se puede emplear también para mejorar la denominación automática de colores, la detección de objetos, el reconocimiento y la segmentación, que están entre las tendencias más populares de la visión por computador.Surface reflectance modeling is an important key to scene understanding. An accurate reflectance model which is based on the laws of physics allows us to achieve realistic and physically plausible results. Using such model, a more profound knowledge about the interaction of light with objects surfaces can be established which proves crucial to variety of computer vision application. Due to high complexity of the reflectance model, the vast majority of the existing computer vision applications base their methods on simplifying assumptions such as Lambertian reflectance or uniform illumination to be able to solve their problem. However, in real world scenes, objects tend to exhibit more complex reflections (diffuse and specular) and are furthermore affected by the characteristics and chromaticity of the illuminants. In this thesis, we incorporate a more realistic reflection model in computer vision applications. To address such complex physical phenomenon, we extend the state-of-the-art object reflectance models by introducing a Multi-Illuminant Dichromatic Reflection model (MIDR). Using MIDR we are able to model and decompose the reflectance of an object with complex specularities under multiple illuminants presenting shadows and inter-reflections. We show that this permits us to perform realistic re-coloring of objects lit by colored lights, and multiple illuminants. Furthermore, we propose a “local” illuminant estimation method in order to model the scenes with non-uniform illumination (e.g., an outdoor scene with a blue sky and a yellow sun, a scene with indoor lighting combined with outdoor lighting through a window, or any other case in which two or more lights with distinct colors illuminating different parts of the scene). The proposed method takes advantage of a probabilistic and graph-based model and solves the problem by re-defining the estimation problem as an energy minimization. This method provides us with local illuminant estimations which improve greatly over state-of-the-art color constancy methods. Moreover, we captured our own multi-illuminant dataset which consists of complex scenes and illumination conditions both outdoor and in laboratory conditions. We show improvement achieved using our method over state-of-the-art methods for local illuminant estimation. We demonstrate that having a more realistic and accurate model of the scene illumination and object reflectance greatly improves the quality of many computer vision and computer graphics tasks. We show examples of improved automatic white balance, scene relighting, and object re-coloring. The proposed theory can be employed in order to improve color naming, object detection, recognition, and segmentation which are among the most popular computer vision trends.
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Talbot, Justin F. "Importance Resampling for Global Illumination." Diss., CLICK HERE for online access, 2005. http://contentdm.lib.byu.edu/ETD/image/etd1021.pdf.
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Ghosh, Abhijeet. "Realistic materials and illumination environments." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/31311.
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Throughout its history, the field of computer graphics has been striving towards increased realism. This goal has traditionally been described by the notion of photo-realism, and more recently and in many cases the more ambitious goal of perceptual realism. Photo-realistic image synthesis involves many algorithms describing the phenomena of light transport in a scene as well as its interaction with various materials. On the other hand, research in perceptual realism typically involves various tone mapping algorithms for display devices as well as algorithms that mimic the natural response of the human visual system in order to recreate the visual experience of a real scene. An important aspect of realistic rendering is the accurate modeling of the scene elements such as light sources and material reflectance properties. This dissertation proposes a set of new techniques for efficient acquisition of material properties as well as new algorithms for high quality rendering with acquired data. Here, we are mostly concerned with the acquisition and rendering of local illumination effects. In particular, we propose a new optical setup for efficient acquisition of the bidirectional reflectance distribution function (BRDF) with basis illumination and various Monte Carlo strategies for efficient sampling of direct illumination. The dissertation also looks into the display end of the image synthesis pipeline and proposes algorithms for displaying scenes on high dynamic range (HDR) displays for visual realism, and for tying the room illumination with the viewing environment for a sense of presence and immersion in a virtual environment. Here, we develop real-time rendering algorithms for driving the HDR displays as well as for active control of room illumination based on dynamic scene content. Thus, we propose contributions to the acquisition, rendering, and display end of the image synthesis pipeline while targeting real-time rendering applications, as well as high quality off-line rendering with realistic materials and illumination environments.Science, Faculty of
Computer Science, Department of
Graduate
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Short, J. "Illumination invariance for face verification." Thesis, University of Surrey, 2006. http://epubs.surrey.ac.uk/843404/.
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The task of face verification is made more difficult when the illumination conditions of image capture are not constrained. The differences in illumination conditions between the stored images of the client and the probe image can be lessened by the application of photometric normalisation. Photometric normalisation is the method of pre-processing an image to a representation that is robust to the illumination conditions of image capture. This thesis presents experiments comparing several photometric normalisation methods. The results demonstrate that the anisotropic smoothing pre-processing algorithm of Gross and Brajovic yields the best results of the photometric normalisations tested. The thesis presents an investigation into the behaviour of the anisotropic smoothing method, showing that performance is sensitive to the selection of its parameter. A method of optimising this parameter is suggested and experimental results show that it offers an improvement in verification rates. The variation of illumination across regions of the face is smaller than across the whole face. A novel component-based approach to face verification is presented to take advantage of this fact. The approach consists of carrying out verification on a number of images containing components of the face and fusing the result. As the component images are more robust to illumination, the choice of photometric normalisation is again investigated in the component-based context. The thesis presents the useful result that the simpler normalisations offer the best results when applied to facial component images. Experiments investigating the various methods of fusing the information from the components are presented, as is the issue of score normalisation. Methods of selecting which components are most useful for verification are also tested. The method of pruning the negative components of the linear discriminant analysis weight vector has been applied to the task of selecting the best subset of face components for verification. The pruned linear discriminant analysis method does not perform as well as the well known sequential floating forward selection method on the well illuminated XM2VTS database, however it achieves better generalisation when applied to the more challenging conditions of the XM2VTS dark set.
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Patmore, Christopher J. "Natural illumination in computer graphics." Thesis, University of Oxford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308755.
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Troncoso, Rey Perla. "Extending Minkowski norm illuminant estimation." Thesis, University of East Anglia, 2012. https://ueaeprints.uea.ac.uk/41970/.
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The ability to obtain colour images invariant to changes of illumination is called colour constancy. An algorithm for colour constancy takes sensor responses - digital images - as input, estimates the ambient light and returns a corrected image in which the illuminant influence over the colours has been removed. In this thesis we investigate the step of illuminant estimation for colour constancy and aim to extend the state of the art in this field. We first revisit the Minkowski Family Norm framework for illuminant estimation. Because, of all the simple statistical approaches, it is the most general formulation and, crucially, delivers the best results. This thesis makes four technical contributions. First, we reformulate the Minkowski approach to provide better estimation when a constraint on illumination is employed. Second, we show how the method can (by orders of magnitude) be implemented to run much faster than previous algorithms. Third, we show how a simple edge based variant delivers improved estimation compared with the state of the art across many datasets. In contradistinction to the prior state of the art our definition of edges is fixed (a simple combination of first and second derivatives) i.e. we do not tune our algorithm to particular image datasets. This performance is further improved by incorporating a gamut constraint on surface colour -our 4th contribution. The thesis finishes by considering our approach in the context of a recent OSA competition run to benchmark computational algorithms operating on physiologically relevant cone based input data. Here we find that Constrained Minkowski Norms operi ii ating on spectrally sharpened cone sensors (linear combinations of the cones that behave more like camera sensors) supports competition leading illuminant estimation.
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Gyllensvärd, Frida. "Efficient Methods for Volumetric Illumination." Doctoral thesis, Linköpings universitet, Medie- och Informationsteknik, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-71460.
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Modern imaging modalities can generate three-dimensional datasets with a very high detail level. To transfer all the information to the user in an efficient way there is a need for three-dimensional visualization. In order to enhance the diagnostic capabilities the utilized methods must supply the user with fast renderings that are easy to interpret correctly. It can thus be a challenge to visualize a three-dimensional dataset in a way that allows the user to perceive depth and shapes. A number of stereoscopic solutions are available on the market but it is in many situations more practical and less expensive to use ordinary two-dimensional displays. Incorporation of advanced illumination can, however, improve the perception of depth in a rendering of a volume. Cast shadows provide the user with clues of distances and object hierarchy. Simulating realistic light conditions is, however, complex and it can be difficult to reach interactive frame rates. Approximations and clever implementations are consequently required. This thesis presents efficient methods for calculation of illumination with the objective of providing the user with high spatial and shape perception. Two main types of light conditions, a single point light source and omni-directional illumination, are considered. Global transport of light is efficiently estimated using local piecewise integration which allows a graceful speed up compared to brute force techniques. Ambient light conditions are calculated by integrating the incident light along rays within a local neighborhood around each point in the volume. Furthermore, an approach that allows the user to highlight different tissues, using luminous materials, is also available in this thesis. A multiresolution data structure is employed in all the presented methods in order to support evaluation of illumination for large scale data at interactive frame rates.
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Mouradian, Sara L. (Sara Lambert). "Target detection through quantum illumination." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/77028.
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Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, February 2012."February 2012." Cataloged from PDF version of thesis.
Includes bibliographical references (p. 69-70).
Classical target detection can suffer large error probabilities in noisy and lossy environments when noise photons are mistaken for signal photons reflected from an object. It has been shown theoretically that the correlation between entangled photons can be used to better discriminate between the signal photons reflected by an object and noise photons, thus reducing the probability of error [13, 15, 17, 7, 6]. This thesis presents the first experimental implementation of target detection enhanced by quantum illumination (QI). Nondegenerate, time entangled signal and idler beams are created through Type-O spontaneous parametric downconversion (SPDC). The signal is attenuated and combined with large levels of noise. The signal is phase modulated to improve the observation by shifting it from DC to 16 kHz. The return signal and idler are recombined in an optical parametric amplifier (OPA) which captures the phase correlation between the two beams. It is found that only 10% of the total signal and idler photons interact at the OPA due to the multi-mode nature of the SPDC emission which does not match the pump spatial mode and thus experience lower gains at the OPA. Considering only the power interacting at the OPA, the signal-to-noise ratio (SNR) of QI agrees with the theoretical model.
by Sara L. Mouradian.
M.Eng.
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Xu, Wenbang. "Defeating eavesdropping with quantum illumination." Thesis, Massachusetts Institute of Technology, 2012. http://hdl.handle.net/1721.1/71512.
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Thesis (Elec. E.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2012.Cataloged from PDF version of thesis.
Includes bibliographical references (p. 77-79).
Quantum illumination is a paradigm for using entanglement to gain a performance advantage-in comparison with classical-state systems of the same optical power-over lossy, noisy channels that destroy entanglement. Previous work has shown how it can be used to defeat passive eavesdropping on a two-way Alice-to-Bob-to-Alice communication protocol, in which the eavesdropper, Eve, merely listens to Alice and Bob's transmissions. This thesis extends that work in several ways. First, it derives a lower bound on information advantage that Alice enjoys over Eve in the passive eavesdropping scenario. Next, it explores the performance of alternative practical receivers for Alice, as well as various high-order modulation formats for the passive eavesdropping case. Finally, this thesis extends previous analysis to consider how Alice and Bob can minimize their vulnerability to Eve's doing active eavesdropping, i.e., when she injects her own light into the channel.
by Wenbang Xu.
Elec.E.
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Keller, Kourtney. "Lumensecity: Objects Illuminated in Time." ScholarWorks@UNO, 2010. http://scholarworks.uno.edu/td/1206.
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This thesis explores the evolution of my work in graduate school. Upon entering into this course of study my artistic expression was polarized into realms of 2 and 3-Dimensional tactile works and experiments in 4-Dimensions (time) in the form of animations and short films. The content and context of these works have interwoven but their presentations remained polarized. In my masterʼs studies I have attempted to synergize the mediums of my artworks in order to achieve more realized and formal presentations. Following this course, I hope for my work to further evolve.
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Williams, Gareth Wyn. "Methods for global illumination models." Thesis, University of Manchester, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.695389.
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Global illumination models are used to simulate the complex lighting effects found in nature. This thesis investigates the wavelet radiance global illumination model and the extension of the wavelet radiance algorithm to support non-uniform rational B-spline (NURBS) surfaces. NURBS are a powerful mathematical form for representing freeform surfaces - NURBS are used in many rendering systems and therefore it is very useful to extend illumination models to support these surfaces.
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Glawson, Shanna. "An Unbearable Illumination of Truth." Digital Commons @ East Tennessee State University, 2021. https://dc.etsu.edu/etd/3914.
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An Unbearable Illumination of Truth is a series of sculptures created to explore the connection between trauma and healing. The sculptural exhibition addresses economic, occupational, childhood, sexual, and gender-based trauma. These sculptures incorporate familiar motifs and visual metaphors to express narratives of varying types of traumas. A broad range of sculptural materials (such as wood, fabric, and found objects) and methods are used to create these symbolic, objective forms. The juxtaposition of shelters with other forms and materials visually enacts the themes of vulnerability and intrigue that characterizes traumatic incidents. Shelters are referenced throughout this entire body of work as an allegory for identity. Ultimately, this work is intended to induce empathy and raise awareness of important, underlying social issues that revolve around trauma. This message is especially important today due to a dramatic increase of trauma related issues as a result of the COVID-19 pandemic.
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Brookshire, Charles Thomas. "Illumination Recovery For Optical Microscopy." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1588936914060945.
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Zain, Dzul Haimi bin Md. "Safavid qur'ans : style and illumination." Thesis, University of Edinburgh, 1997. http://hdl.handle.net/1842/21628.
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This thesis aims to a achieve something that has not been done before- to identify the style of illuminated Safavid Qur'ans. The first serious attempt to look critically at a wide spectrum of Qur'an manuscripts dates from the famous World of Islam festival held in London in 1976, with its many exhibitions. Since then, hardly anything has been published specifically on Safavid Qur'äns. The major subsequent study on illuminated Qur'äns is that carried out by David James in his book entitled Qur'äns of the Mamluks (1988). Most writings on Safavid Qur'äns have been in bits and pieces. The thin and ambiguous distinction between the style of 16th-17th century Ottoman, Mughal and Safavid Qur'änic illumination adds to the tendency that scholars have evinced to skim over the problems. Many Qur'äns are without provenance; indeed, only a few have a clear provenance. Discussion thus tends to linger on secure by dated or provenanced examples of Qur'äns which possess full documentary information. The methods to be used in identifying these Qur'äns remain to be discovered by future researchers. To tackle all three schools of Qur'änic illumination-Safavid, Ottoman and Mughal-would be too big a task. Even to concentrate on Safavid Qur'äns alone is itself a task that requires time, devotion, and, incidentally, strong financial support to arrive at a sufficiently detail analysis.
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Achar, Supreeth. "Active Illumination for the RealWorld." Research Showcase @ CMU, 2017. http://repository.cmu.edu/dissertations/1080.
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Active illumination systems use a controllable light source and a light sensor to measure properties of a scene. For such a system to work reliably across a wide range of environments it must be able to handle the effects of global light transport, bright ambient light, interference from other active illumination devices, defocus, and scene motion. The goal of this thesis is to develop computational techniques and hardware arrangements to make active illumination devices based on commodity-grade components that work under real world conditions. We aim to combine the robustness of a scanning laser rangefinder with the speed, measurement density, compactness, and economy of a consumer depth camera. Towards this end, we have made four contributions. The first is a computational technique for compensating for the effects of motion while separating the direct and global components of illumination. The second is a method that combines triangulation and depth from illumination defocus cues to increase the working range of a projector-camera system. The third is a new active illumination device that can efficiently image the epipolar component of light transport between a source and sensor. The device can measure depth using active stereo or structured light and is robust to many global light transport effects. Most importantly, it works outdoors in bright sunlight despite using a low power source. Finally, we extend the proposed epipolar-only imaging technique to time-of-flight sensing and build a low-power sensor that is robust to sunlight, global illumination, multi-device interference, and camera shake. We believe that the algorithms and sensors proposed and developed in this thesis could find applications in a diverse set of fields including mobile robotics, medical imaging, gesture recognition, and agriculture.
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Zabriskie, Nathan Andrew. "NetLight: Cloud Baked Indirect Illumination." BYU ScholarsArchive, 2018. https://scholarsarchive.byu.edu/etd/7031.
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Indirect lighting drastically increases the realism of rendered scenes but it has traditionally been very expensive to calculate. This has long precluded its use in real-time rendering applications such as video games which have mere milliseconds to respond to user input and produce a final image. As hardware power continues to increase, however, some recently developed algorithms have started to bring real-time indirect lighting closer to reality. Of specific interest to this paper, cloud-based rendering systems add indirect lighting to real-time scenes by splitting the rendering pipeline between a server and one or more connected clients. However, thus far they have been limited to static scenes and/or require expensive precomputation steps which limits their utility in game-like environments. In this paper we present a system capable of providing real-time indirect lighting to fully dynamic environments. This is accomplished by modifying the light gathering step in previous systems to be more resilient to changes in scene geometry and providing indirect light information in multiple forms, depending on the type of geometry being lit. We deploy it in several scenes to measure its performance, both in terms of speed and visual appeal, and show that it produces high quality images with minimum impact on the client machine.
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Aston, Stacey Jane. "Using an illumination discrimination paradigm to investigate the role of illumination priors in colour perception." Thesis, University of Newcastle upon Tyne, 2018. http://hdl.handle.net/10443/4116.
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Previous studies suggest human colour constancy is optimised for natural daylight illuminations - a \blue bias" for colour constancy - but it is unclear how such a bias is encoded in the visual system. We use an illumination discrimination task to test two hypothesised mechanisms. Both hypotheses suggest that the human visual system has a prior expectation that illuminations are more likely to vary in a bluer region of chromaticity space. One hypothesis (the nature hypothesis) suggests this has developed in the human visual system through evolution, with selection of colour mechanisms that have reduced sensitivity to global bluer changes across a scene (a species prior). The second hypothesis suggests that the prior is learnt through experience with illuminations (the nurture hypothesis - an individual prior). In Chapter 3 we expand on previous results showing a \blue bias" for colour constancy when the illumination varies from a neutral reference, to show that the \blue bias" prevails in variants of the task where the illuminations are all chromatically biased. This result supports the nature hypothesis. However, depending on the chromatic bias, di erent biases can emerge in the threshold data that are more supportive of the nurture hypothesis. In Chapter 4 we explore individual di erences in illumination discrimination ability, compare illumination discrimination ability with chromatic contrast detection ability, and develop ideal observer models for the task. The results in this Chapter are mostly in support of the nurture hypothesis. In Chapter 5 we show that illumination priors may play a role in the recent visual illusion of a dress photograph that appeared blue and black to some observers but white and gold to others. Finally, in Chapter 6, we search for evidence that observers can learn an illumination prior during a psychophysical task. We conclude that the \blue bias" is likely governed by both a learnt prior over the characteristics of daylight illuminations (the nurture hypothesis) and a generic reduction in sensitivity to bluer changes in an illumination (the nature hypothesis).
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Khan, Haris Ahmad. "Multispectral constancy for illuminant invariant representation of multispectral images." Thesis, Bourgogne Franche-Comté, 2018. http://www.theses.fr/2018UBFCK028/document.
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En imagerie couleur, un système d’acquisition capture une scène avec une haute résolution spatiale mais une résolution spectrale limitée. L’imagerie hyperspectrale permet d’acquérir la scène avec une grande résolution spectrale. Un système d’acquisition hyperspectrale est un ensemble complexe et il est difficile de l’utiliser pour acquérir des données dans une situation où les conditions d’imageries ne sont pas contrôlées. De plus, ces systèmes sont chers et souvent encombrants ou difficiles à manipuler. À cause de ces problèmes, l’utilisation de l’imagerie hyperspectrale n’a pas encore été beaucoup utilisée en vision assistée par ordinateur, et la plupart des systèmes de vision utilise l’imagerie couleur.L’imagerie multispectrale propose une solution intermédiaire, elle permet de capturer une information moins résolue selon la dimension spectrale, comparée à l’hyperspectrale, tout en préservant la résolution spatiale. Ces systèmes sont moins encombrants et moins difficiles à maitriser grâce aux récentes avancées technologiques, et arrivent sur le marché en tant que produits commerciaux. On peut citer les matrices de filtres spectraux (spectral filter arrays) qui permettent l’acquisition en temps réel d’images multispectrales grâce à l’utilisation d’unecaméra de complexité similaire à une caméra couleur. Jusqu’ici, les informations capturées par ces systèmes étaient considérées de la même manière que les imageurs hyperspectraux en champ proche, c’est à dire que pour utiliser l’information au mieux, les conditions d’acquisitions devaient être connues et le système calibré, en particulier pour l’éclairage de la scène et la dynamique de la scène.Afin d’élargir l’utilisation de l’imagerie multispectrale pour la vision par ordinateur dans des conditions générales, je propose dans cette thèse de développer les méthodes calculatoires en imagerie couleur (computational color imaging) et de les adapter aux systèmes d’imagerie multispectraux. Une caractéristique très puissante de l’imagerie couleur est de proposer un rendu constant des couleurs de la surface d’un objet à travers différentes conditions d’acquisition via l’utilisation d’algorithmes et divers traitements de l’information.Dans cette thèse, j’étends la notion de constance des couleurs et de balance des blancs de l’imagerie couleur à l’imagerie multispectrale. J’introduis le terme de constance de l’information spectrale (multispectral constancy).Je propose la construction d’un ensemble d’outils permettant la représentation constante de l’information spectrale à travers le changement d’éclairage. La validité de ces outils est évaluée à travers la reconstruction de la réflectance spectrale des objets lorsque l’éclairage change. Nous avons également acquis de nouvelles images hyperspectrales et multispectrales mises à disposition de la communauté.Ces outils et données permettront de favoriser la généralisation de l’utilisation de l’imagerie multispectrale en champ proche dans les applications classiques utilisant traditionnellement l’imagerie couleur et de sortir ce mode d’imagerie des laboratoires. L’avantage en vision par ordinateur est une meilleure analyse de la réflectance de la surface des objets et donc un avantage certain dans les tâches de classification et d’identification de matériauxA conventional color imaging system provides high resolution spatial information and low resolution spectral data. In contrast, a multispectral imaging system is able to provide both the spectral and spatial information of a scene in high resolution. A multispectral imaging system is complex and it is not easy to use it as a hand held device for acquisition of data in uncontrolled conditions. The use of multispectral imaging for computer vision applications has started recently but is not very efficient due to these limitations. Therefore, most of the computer vision systems still rely on traditional color imaging and the potential of multispectral imaging for these applications has yet to be explored.With the advancement in sensor technology, hand held multispectral imaging systems are coming in market. One such example is the snapshot multispectral filter array camera. So far, data acquisition from multispectral imaging systems require specific imaging conditions and their use is limited to a few applications including remote sensing and indoor systems. Knowledge of scene illumination during multispectral image acquisition is one of the important conditions. In color imaging, computational color constancy deals with this condition while the lack of such a framework for multispectral imaging is one of the major limitation in enabling the use of multispectral cameras in uncontrolled imaging environments.In this work, we extend some methods of computational color imaging and apply them to the multispectral imaging systems. A major advantage of color imaging is the ability of providing consistent color of objects and surfaces across varying imaging conditions. In this work, we extend the concept of color constancy and white balancing from color to multispectral images, and introduce the term multispectral constancy.The validity of proposed framework for consistent representation of multispectral images is demonstrated through spectral reconstruction of material surfaces from the acquired images. We have also presented a new hyperspectral reflectance images dataset in this work. The framework of multispectral constancy will make it one step closer for the use of multispectral imaging in computer vision applications, where the spectral information, as well as the spatial information of a surface will be able to provide distinctive useful features for material identification and classification tasks
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Wang, Zhaoshuai. "ILLUMINATE THE PATHWAY OF MEMBRANE PROTEIN ASSOCIATION AND DEGRADATION." UKnowledge, 2017. http://uknowledge.uky.edu/chemistry_etds/87.
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Escherichia coli transporter protein AcrB and its homologues are the inner membrane components of the Resistance-Nodulation-Division (RND) family efflux pumps in Gram-negative bacteria. It is well accepted that soluble proteins are only marginally stable, but such insight is missing for membrane proteins. The lack of stability data, including thermodynamic stability and oligomer association affinity is a result of intrinsic difficulties in working with membrane proteins. In addition, the degradation of soluble proteins in E. coli has been extensively studied whereas the degradation process of membrane proteins remains unclear. A focus of my thesis is the validation and development of methods used to measure the thermo- and oligomeric- stability of membrane proteins. I investigated the mechanism of a popular thermal-stability assay developed specifically for the study of membrane proteins uses a thiol-specific probe, 7-diethylamino-3-(4-maleimidophenyl)-4-methylcoumarin (CPM). I found that, contrary to current understanding, the presence of a sulfhydryl group was not a prerequisite for the CPM thermal stability assay. The observed fluorescence increase is likely caused by binding of the fluorophore to hydrophobic patches exposed upon protein unfolding. I then applied these methods in the study of three projects. In the first project, I investigated how suppressor mutations restore the function of AcrBP223G, in which the Pro223 to Gly mutation compromised the function of AcrB via disrupting AcrB trimerization. The results suggested that the function loss resulted from compromised AcrB trimerization could be restored through various mechanisms involving the compensation of trimer stability and substrate binding. In the second project, I created two AcrB fusion proteins, with C-terminal yellow fluorescence protein (YFP) and cyan fluorescence protein (CFP), respectively. YFP and CFP form a fluorescence resonance energy transfer (FRET) pair. Using this pair of fusion proteins, I studied AcrB assembly both in detergent micelles and in lipid bilayers. A positive cooperativity was observed in kinetic studies of association of AcrB trimer. Reconstitution experiment revealed that the association showed a higher FRET efficiency and faster association rate in liposome than in DDM. In the last project, I developed a fluorescence method to study the degradation of AcrB-ssrA by the ClpXP system. Comparing to the degradation of GFP-ssrA, degradation of AcrB-CFP-ssrA showed a lower maximum velocity and tighter binding to the enzymes with a positive cooperativity.
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Negash, Awoke. "Superresolution fluorescence microscopy with structured illumination." Doctoral thesis, Universitat Politècnica de Catalunya, 2017. http://hdl.handle.net/10803/461679.
Full textAbstract:
The resolution of a conventional fluorescence microscope image is diffraction limited which achieves a spatial resolution of 200nm lateral and 500nm axial. Recently, many superresolution fluorescence microscopy techniques have been developed which allow the observation of many biological structures beyond the diffraction limit. Structured illumination microscopy (SIM) is one of them. The principle of SIM is based on using a harmonic light grid which down modulates the high spatial frequencies of the sample into the observable region of the microscope. The resolution enhancement is highly dependent on the reconstruction technique, which restores the high spatial frequencies of the sample to their original position. Common SIM reconstructions require the perfect knowledge of the illumination pattern. However, to perfectly control the harmonic illumination patterns on the sample plane is not easy in experimental implementations and this makes the experimental setup very technical. Reconstructing SIM images assuming the perfect knowledge of the illumination intensity patterns may, therefore, introduce artifacts on the estimated sample due to the misalignment of the grid that can occur during experimental acquisitions. To tackle this drawback of SIM, in this these, we have developed blind-SIM reconstruction strategies which are independent of the illumination patterns. Using the 3D blind-SIM reconstruction strategies we extended the harmonic SIM to speckle illumination microscopy which uses random unknown speckle patterns that need no control, unlike the harmonic grid patterns. For harmonic-SIM images, since incorporating some information about illumination patterns is valuable, we have developed a 3D positive filtered blind-SIM reconstruction which confines the iterative estimation of the illuminations in the vicinity of the Fourier peaks (using carefully designed Fourier filter masks) in the Fourier space. Using blind-SIM reconstruction techniques a lateral resolution of about 100nm and axial resolution of about 200nm is obtained in both speckle and harmonic SIM. In addition, to reduce the out-of-focus problem in widefield images, a simple computational technique which is based on reconstructing 2D data with 3D PSF is developed based on blind-SIM reconstruction. Moreover, to combine the functionalities of SIM and light sheet microscopy, as a proof of concept, we have developed a simple microscope setup which produces a structured light sheet illumination pattern.La microscopie de fluorescence optique est l’un des outils les plus puissants pour étudier les structures cellulaires et moléculaires au niveau subcellulaire. La résolution d’une image de microscope conventionnel à fluorescence est limitée par la diffraction, ce qui permet d’obtenir une résolution spatiale latérale de 200nm et axiale de 500nm. Récemment, de nombreuses techniques de microscopie de fluorescence de super-résolution ont été développées pour permettre d’observer de nombreuses structures biologiques au-delà de la limite de diffraction. La microscopie d’illumination structurée (SIM) est l’une de ces technologies. Le principe de la SIM est basé sur l’utilisation d’une grille de lumière harmonique qui permet de translater les hautes fréquences spatiales de l’échantillon vers la région d’observation du microscope. L’amélioration de la résolution de cette technologie de microscopie dépend fortement de la technique de reconstruction, qui rétablit les hautes fréquences spatiales de l’échantillon dans leur position d’origine. Les méthodes classiques de reconstruction SIM nécessitent une connaissance parfaite de l’illumination de l’échantillon. Cependant, l’implémentation d’un contrôle parfait de l’illumination harmonique sur le plan de l’échantillon n’est pas facile expérimentalement et il présente un grand défi. L’hypothèse de la connaissance parfaite de l’intensité de la lumière illuminant l’échantillon en SIM peut donc introduire des artefacts sur l’image reconstruite de l’échantillon, à cause des erreurs d’alignement de la grille qui peuvent se présenter lors de l’acquisition expérimentale. Afin de surmonter ce défi, nous avons développé dans cette thèse des stratégies de reconstruction «aveugle» qui sont indépendantes de d’illumination. À l’aide de ces stratégies de reconstruction dites «blind-SIM», nous avons étendu la SIM harmonique pour l’appliquer aux cas de «SIM-speckle» qui utilisent des illuminations aléatoires et inconnues qui contrairement à l’illumination harmonique, ne nécessitent pas de controle. Comme il est utile de récupérer des informations sur l’illumination en SIM harmonique, nous avons développé une reconstruction blind-SIM tridimensionnel et filtrée qui confine l’estimation itérative des illuminations au voisinage des pics dans l’espace de Fourier, en utilisant des masques de filtre de Fourier soigneusement conçus. En utilisant des techniques de reconstruction blind-SIM, une résolution latérale d’environ 100 nm et une résolution axiale d’environ 200 nm sont obtenues, à la fois en SIM harmonique et en SIM speckle. En outre, pour réduire le problème de focalisation dans les images de champ large, une technique de calcul simple qui repose sur la reconstruction bidimensionnel de données à partir de PSF tridimensionnel est développée. En outre, afin de combiner à la fois les fonctionnalités de la SIM et de la microscopie á nappe de lumière, en tant que preuve de concept, nous avons développé une configuration de microscope simple qui produit une nappe de lumière structurée