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Dissertations / Theses on the topic 'Projector'
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Sierra, Hernández Wilfrido 1975. "Micro laser personal projector." Thesis, Massachusetts Institute of Technology, 2003. http://hdl.handle.net/1721.1/29704.
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Thesis (S.M.)--Massachusetts Institute of Technology, School of Architecture and Planning, Program in Media Arts and Sciences, 2003.Includes bibliographical references (p. 79-81).
The proposed research is a study of the technology and applications of personal projectors, small and inexpensive video projection devices intended for use in battery-powered hand-held or wearable products. This research will describe some ways of steering laser beams in one dimension to produce up to a one-meter wide screen. A one dimensional micro laser array will be used to avoid the effect of flickering while projecting an image. The use of a single lens to focus all lasers will save the complexity of collimating each laser independently. At the moment, the Micro Laser Personal Projector is displaying an image of 50 x 480 pixels. A DC brushless motor is used to steer the laser beams vertically. A fixed plano-convex lens focuses all 50 lasers. A piezo-electric device will be used on the future to increase the laser projector's image resolution from 50 x 480 to 200 x 480 pixels. With this image resolution the Micro Laser Personal Projector can be used in communications, entertainment, and medical applications.
by Wilfrido Sierra Hernández.
S.M.
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Hilario, Maria Nadia. "Occlusion detection in front projection environments based on camera-projector calibration." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=83866.
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Camera-projector systems are increasingly being used to create large displays for data visualization, immersive environments and augmented reality. Front projection displays, however, suffer from occlusions, resulting in shadows and light being cast, respectively, onto the display and the user. Researchers have begun addressing the issue of occlusion detection to enable dynamic shadow removal and to facilitate automatic user sensing in interactive display applications. A camera-projector system for occlusion detection in front projection environments is presented. The approach is based on offline, camera projector geometric and color calibration, which then enable online, dynamic camera view synthesis of arbitrary projected scenes. Occluded display regions are detected through pixel-wise differencing between predicted and captured camera images. The implemented system is demonstrated for dynamic shadow detection and removal using a dually overlapped projector display.
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Drozdowski, A. "Modeling the folded shell projector." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp03/MQ57282.pdf.
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Chan, Hoi Chun. "Hand held and wireless micro projector /." View abstract or full-text, 2006. http://library.ust.hk/cgi/db/thesis.pl?ECED%202006%20CHAN.
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Nordbryhn, Ola. "Automated Calibration of Multi-Projector Arrays." Thesis, Norwegian University of Science and Technology, Department of Telematics, 2009. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-9005.
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Setting up large multi-projector arrays today usually come at a cost; manual calibration of each projector requires time. The orientation of the image from each projector must be correctly aligned in six axes to make the final projected output fit the screen. Not all aspects of calibrating projectors are possible to correct, consumer hardware usually only covers two or three of the axes, the remainder are often corrected using clever projector placement. Also, the degree of which it is possible to adjust is also limited, decreasing placement flexibility. As the collaboration surfaces in Hems lab requires a large number of projectors to work seamlessly together, good calibration techniques are required in order to keep setup and maintenance time low, while giving highly accurate calibration results. Abstract By creating a software demonstrator that automates much of the calibration and enables quick and easy setup, I have made possible rapid prototyping, testing and demonstration of multi-projector arrays, both with single and stereoscopic views. As I will prove, this software shows a flexible approach that may be of use, not only to the Caruso lab and future Hems lab, but may also be used in other settings where projector technology up to this date still has not been widely used, by overcoming the calibration and image warping hurdles and limitations. Abstract The software is developed with basis in the OpenCV computer vision library, and implemented in Python. Tests show that calibration time for a single projector may be cut down to a matter of seconds, regardless of the placement of the projector in relation to the screen, whereas traditional calibration often still not reach the same level of accuracy even if taking tens of minutes or require repositioning of the projector to compensate for the lack of adjustment possibilities.
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Freeman, J. P. "Visor projected helmet mounted display for fast jet aviators using a Fourier video projector." Thesis, University of Cambridge, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.599216.
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Although the pixel failure integrity is widely published as the key advantage of a Fourier projector, the potential high luminance image may prove to be more important for such things as the display of aircraft symbology. We have shown here that it is possible to achieve image luminance levels in excess of 34000cd/cm2 at the eye using a laser source less than 0.1mW. One of the key development areas of CGH calculation has been to try to get an even replay field. In this thesis it is shown that the problem is largely due to overlapping fields from neighbouring pixels. There is no acceptable solution using one hologram that does not sacrifice other key features of the replay field. We have therefore derived a simple new algorithm, TSP, that allows us to show neighbouring pixels on separate CGHs, simply circumventing the problem of cross-pixel interference. This results in a diffraction limited performance from the hologram with negligible interference, even when defocused. The Fourier transform used a form the CGH was then taken back to a more basic level. By re-writing the algorithm, we have access to the wavefront for each pixel and the ability to modify each separately before assembling them all to form CGH. This forms the basis of our second new technique of PWPS. This resulted in a very powerful method that could correct the aberrations of almost any system. It was demonstrated by creating a 120° video projector using a glass marble as the projection lens. This method also opens up new opportunities of simpler optics, 3D, plus the ability to put pixels anywhere in the replay field. The use of a FT projector to replace CRTs requires a screen. Various technologies and methods were investigated to increase the exit pupil and reduce sparkle. The final system was a working aviators helmet mounted display, using the visor as the final collimating element.
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Sud, Daniel. "Design of a multi-projector display system." Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=82638.
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This thesis presents a new multi-projector front-projection display system that can be used for an immersive environment. The implementation of such a system faces new challenges that were avoided by design in CAVE-like systems. These include removing the perspective warping from misaligned projectors and adjusting the intensity to create a uniformly lit display in regions where projectors overlap. Also, when the display is in use, occluding objects between the projector and the display surface cause shadows on the display that must be removed. These three issues have been addressed in this work based in part on algorithms from the field of computational geometry and on techniques from existing projector systems.
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Wu, Brian Xiuken. "A controllable laser projector for diverting traffic." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/85524.
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Thesis: M. Eng., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2013.Cataloged from PDF version of thesis.
Includes bibliographical references (pages 125-127).
For this Master's thesis, I designed and implemented a combined laser and controller system that can receive and convert commands from a computer into useful laser projections. In the last 10 years, on average, one police officer, who is conducting a vehicle stop or directing traffic, is struck and killed by an oncoming vehicle per month in the United States. Most of these instances occur at night. Current literature proposes that for some drivers, especially those who are fatigued, the combination of bright, rapidly flashing emergency lighting causes them to drive closer to a emergency vehicle rather than away from it. An effective solution to this problem is to extend the visual range of warning lights. Existing methods of lane diversion are time consuming, bulky and/or dangerous to deploy. The project is a system that allows the officer to quickly delineate a series of laser points to simulate a line of road-side flares. This will result in a commonly-used, perceptually salient visual signal that will induce traffic away from the cruiser. The controller interfaces with the police officer's computer over a USB 2.0 interface. Internal EEPROM allows the system to store up to 100 unique coordinates and intensities. The communication protocol is handled with the SerialPy library. Testing and calibration of the laser projector is integrated with a simple UI and rear-facing cameras. The UI also allows the user to select arbitrary points for the laser spots to be projected on to, creating a series of virtual flares. Using a cylindrical lens to expand the laser beam and reduce divergence, we were able to focus the laser spot accurately to 50m, increasing optical power density and increasing visual recognition at a distance. The laser output power can be configured from 0.2mW to 1W using a PWM driver.
by Brian Xiuken Wu.
M. Eng.
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Kale, Jeevan. "A Service Discovery-Enabled LCD Projector Device." ScholarWorks@UNO, 2002. http://scholarworks.uno.edu/td/6.
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The widespread deployment of inexpensive communications technology, computational resources in the networking infrastructure and network-enabled end devices pose a problem for end users: how to locate a particular network service or device out of those accessible. Service providers use Service Discovery Services (SDS) to advertise the descriptions of available or already running services, while clients use SDS to compose queries for locating these services. Service descriptions and queries use the eXtensible Markup Language (XML) to encode vendor specific information and device- or service-specific capabilities as well as the actions addressed to the device or service. This report presents the architecture and implementation of a SDS used to locate enabled LCD projectors and use them for presentation. The presentation service provides all the capabilities to the end user so that he can choose the projector device of his interest and use the graphical user interface to navigate thorough the presentation. The presentation service also has the capability to use more than one projector at a time. We use the Universal Plug and Play suite of protocols to establish the communication between client and the projector device.
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Andersson, Carl. "Seamless Automatic Projector Calibration of Large Immersive Displays using Gray Code." Thesis, Uppsala universitet, Avdelningen för visuell information och interaktion, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-207956.
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Calibrating multiple projectors to create a distortion free environment is required in many fields e.g. simulators and the calibration may be done in a series different ways. This report will cover an automatic single camera projector calibration algorithm.The algorithm handles multiple projectors and can handle projectors covering bigger field of view than a camera by supporting image stitching. A proof of concept blending algorithm is also presented. The algorithm includes a new developed interpolation method building on spline surfaces and an orientation calculation algorithm that calculates the orientation difference between two camera views. Using the algorithm to calibrate, gives pixel accuracy of less than 1 camera pixel after interpolation and the relation between two views are calculated accurately. The images created using the algorithm is distortion free and close to seamless. The algorithm is limited to a controlled projector environment and calibrates the projectors for a single viewpoint. Furthermore, the camera needs to be calibrated positioned in the sweet spot although it can be arbitrary rotated.
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Walden, Alan Keith. "Signal processing techniques on an underwater acoustic projector." Thesis, Georgia Institute of Technology, 1991. http://hdl.handle.net/1853/17336.
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Summet, Jay W. "Virtual Rear Projection: Improving the User Experience with Multiple Redundant Projectors." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/19737.
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Thesis (Ph.D)--Computing, Georgia Institute of Technology, 2008.Committee Co-Chair: Abowd, Gregoy D.; Committee Co-Chair: Rehg, James M.; Committee Member: Corso, Gregoy M.; Committee Member: Mynatt, Elizabeth; Committee Member: Pierce, Jeffrey S.; Committee Member: Pinhanez, Claudio.
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Lindroth, Lars, and Martin Lindstedt. "Development of a MEMS Mirror Based Vector Graphics Projector." Thesis, KTH, Maskinkonstruktion (Inst.), 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-99283.
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De flesta projektorer som finns på marknaden idag levererar en bild med hjälp av små färgpunkter, så kallade pixlar. Dessa projektorer är oftast avsedda för multimediabruk, exempelvis för att visa datorgrafik och filmer. Det finns dock ett problem med denna typ av teknik; när bildstorleken ökas så riskerar pixlarna att bli synliga. Detta kan i sin tur upplevas som att bildkvalitén blir sämre. Den här rapporten beskriver utvecklingen av prototyp som med en ny slags projektorteknik. Denna använder sig inte av traditionella pixlar, utan av vektorer som ritas upp av en laserpunkt. För att kunna styra lasern används två mikrospeglar som kan röra sig i en dimension vardera. Tillsammans ger dessa möjligheten att förflytta laserpunkten i två dimensioner. Tekniken bakom dessa speglar är fortfarande väldigt ny, vilket har resulterat i att bara tidiga prototypexemplar finns att tillgå. Eftersom detta är fallet så finns det inte heller några tydliga specifikationer eller modeller för speglarna och deras prestanda tillgänglig. För att kunna rita bilder bestående av vektorer har författarna valt att dela upp projektet i två fördjupningsområden. Det första området involverar utvecklingen av ett reglersystem för styrning av speglarna. En regulatoralgoritm har konstruerats som tillåter snabb och precis styrning av speglarna. De okontrollerade speglarnas översläng på 98% har kunnat reduceras till under 5% utan att negativt påverka stigtiden. Det andra området berör det faktum att speglarna enbart kan förflyttas en begränsad vinkel under ett givet tidsförlopp. Det har därför varit relevant att undersöka hur uppritningen av en bild kan planeras så att så många vektorer som möjligt kan ritas. Testerna som gjorts inom detta område på 128 slumpade vektorer indikerar att en planeringsalgoritm leder till att bilderna kan ritas upp till 45% snabbare än vad som hade varit fallet om ingen planeringsalgoritm använts. Den färdiga prototypen klarar av att rita enkla grafiska element såsom polygoner och cirklar. Utifall komplexiteten på bilderna ökas, så att de överskrider cirka 30 vektorer styck, så kommer bilden att upplevas som flimrande. Detta kan tyvärr uppfattas som ansträngande för betraktarens ögon. Anledningen till prototypen inte klarar av att rita mer är att speglarnas prestanda helt enkelt är för begränsad för detta användningsområde.Most of the projector technologies that exist in the current marketplace are focused on providing a picture based on small dots of color, so called pixels. These projectors are often intended for multimedia usage, such as showing computer graphics and movies. The issue with systems like these is that the picture will appear worse when the physical size of the image is large enough to show individual pixels. This report describes the development of a prototype for a new projection system that does not use individual pixels, but rather vectors, to display graphics. Instead of representing images as pixels they are represented as lines and curves drawn by a laser. In order to deflect the laser and draw patterns, two microelectromechanical mirrors are used, each one providing deflection in one axis. The technology behind these mirrors is still in its infancy, which has led to only early prototype samples being currently available. Due to this, no data or models describing the mirrors and their performance exist. To be able to draw images consisting of vectors the authors have had to specialize in two different fields. The first field involves the development of a control system for steering the mirrors. A controller has been constructed that allows for fast and precise actuation of the mirrors. The results from this field indicate that with the help of a control algorithm, the uncontrolled mirrors’ overshoot of 98% can be reduced to below 5% without having a negative impact on the rise time. The second field deals with the fact that the mirrors have a limit of how much they can be actuated within any given timeframe. Therefore it has been relevant to examine how one can plan to draw vector images so that the amount of vectors shown can be maximized. The results from this field indicate that for images with 128 random vectors, a planning algorithm will cause the image to be drawn up to 45% faster than without any planning. The developed prototype is able to display simple graphical elements such as polygons and circles. Increasing the complexity, typically beyond 30 vectors, will unfortunately result in flickering images that strain the eyes. This is mostly due to the fact that the mirrors lack the performance that this kind of application demands.
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Bryan, Charles Edward. "An electron beam addressed liquid crystal light valve projector." Thesis, University of Cambridge, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.235841.
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The contents of this dissertation relate to a liquid crystal light valve which is addressed by an electron beam. The light valve has been configured with a computer aided designed optical projection system, to produce an electron beam addressed liquid crystal light valve projector. The projector is capable of turning an electrical signal into a corresponding projected picture. A minimum resolution of 33um was demonstrated in a smectic-A liquid crystal light valve and one of 40um in a dyed phase change guest-host liquid crystal light valve. The diameter of the active area of the light valve was 45mm. Crucial to the realization of the projector was the patented invention and design of an electrically highly anisotropic disc of 47mm diameter which was approximately 2mm thick. The disc, which was conducting through its thickness and insulating across its plane, formed the top interface of the liquid crystal light valve and permitted the electron beam to deposit a charge pattern which could be conveyed to the thin liquid crystal layer without loss of resolution. The disc was made using a specially constructed piece of apparatus wherein the holes in a glass capillary array were filled with a low melting point alloy. Discs were made using three different low melting point alloys and their various merits were considered. Consideration was also given to developing the deflection coils used in this projector. Computer aided design resulted in a deflection coil system capable of a resolution of over 8 x 108 pixels in a 50mm x 50mm frame at a half angular aperture of 1mrad. In order to evaluate the resolution of the light valve, a micro-computer controlled dot pattern generator was built. This was used to drive the deflection coils in such a way as to control both the dwell time and position of the electron beam spot. Lines of different spacings were written on the light valve. Electron and optical micrographs are presented to demonstrate the quality of the anisotropic disc. Photographs and optical micrographs are included to show the pictures which were obtained from the projector and also the lines written on the light valve.
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Li, Shuo. "Multiple-LED color-sequential liquid crystal on silicon projector /." View abstract or full-text, 2008. http://library.ust.hk/cgi/db/thesis.pl?ECED%202008%20LIS.
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Haas, Christopher. "The projector basis method for electronic band structure calculations." W&M ScholarWorks, 1996. https://scholarworks.wm.edu/etd/1539623886.
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Over the last several decades, two methods have emerged as the standard tools for the calculation of electronic band structures. These methods, the Car-Parinello plane wave method and the linear augmented plane wave method (LAPW), each have strengths and weaknesses in different regimes of physical problems. The Car-Parinello algorithm is ideal for calculations with soft pseudopotentials and large numbers of atoms. The LAPW method, on the other hand, easily handles all-electron and hard-core pseudopotential calculations with a small number of atoms. The projector basis method, presented here, is a hybrid mixed basis method which allows the calculation of moderately large ({dollar}\sim{dollar}200) numbers of atoms represented by hard pseudopotentials. This method will then be used to calculate two members of a relatively new mass of materials, called electrides, in which the anion has been replaced with a localized electron.
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SILVA, VICTOR LOPES DA. "A PROJECTOR OPERATOR FORMALISM TO SOLVE THE ANDERSON HAMILTONIAN." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2013. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=23245@1.
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PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIROCOORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
PROGRAMA DE SUPORTE À PÓS-GRADUAÇÃO DE INSTS. DE ENSINO
Nesta dissertação propomos um formalismo de operadores de projeção para obter a energia do estado fundamental do Hamiltoniano da Impureza de Anderson com repulsão Coulombiana U infinita. Este formalismo consiste em projetar o espaço de Hilbert em um subespaço de uma unica função correspondente ao estado fundamental do mar de Fermi, onde uma versão renormalizada do Hamiltoniano opera. A energia do estado fundamental pode ser obtida através de um processo autoconsistente. conhecendo a energia e possível calcular as propriedades fundamentais do sistema como a magnetização em função do campo magnético externo, a susceptibilidade magnética, a dependência da ocupação eletrônica como função da energia local da impureza e a temperatura Kondo, a qual caracteriza o comportamento universal do problema Kondo.
In this dissertation we propose a projector operator formalism to obtain the ground state energy of the Impurity Anderson Hamiltonian with innite Coulomb repulsion U. This formalism consists in projecting the Hilbert space into a sub-space of one function corresponding to the ground state of the free Fermi sea where a renormalized version of the Hamiltonian operates. The ground state energy can be obtained through a self-consistent process. From the knowledge of the energy, it is possible to calculate the fundamental properties of the system as it is the magnetization as a function of an external magnetic field, the magnetic susceptibility, the dependence of the electronic occupation as a function of the local energy of the impurity and the Kondo temperature, which characterizes the universal behavior of a Kondo problem.
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Miao, Lina. "Efficient seismic imaging with spectral projector and joint sparsity." Thesis, University of British Columbia, 2014. http://hdl.handle.net/2429/46256.
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In this thesis, we investigate the potential of improving the efficiency of seismic imaging with two advanced techniques: the spectral projector and the ???joint sparsity???. The spectral projector offers an eigenvalue decomposition free computation routine that can filter out unstable evanescent wave components during wave equation based depth extrapolation. ???Joint sparsity??? aims to improve on the pure sparsity promoting recovery by making use of additional structure information of the signal. Besides, a new sparsity optimization algorithm ??? PQNl1 ??? is proposed to improve both theoretical convergence rate and practical performance for extremely large seismic imaging problems.
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Thakur, Mahesh Kumar Singh. "Advanced Color Projector Design Based on Human Visual System." University of Dayton / OhioLINK, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1324514021.
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Åberg, Viktor. "Automatic projector warping using a multiple view camera approach." Thesis, KTH, Optimeringslära och systemteori, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-188775.
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The main objective of this master thesis was to construct an automatic method for calibrating a projector to display images on a curved screen without the images looking deformed from a certain intended viewing position. Since the method was thought to be used in a flight simulator, where the intended viewing position has an occluded view of the screen, the method needed to be able to handle these occlusions in some way, and the proposed solution was to use two cameras for the calibration; one in the intended viewing position and one with a more clear sight of the screen.This thesis adds the multi-camera functionality to an existing algorithm for projector calibration using a single camera, which was developed in 2013. This algorithm performs well in calibrating projectors with respect to views that have a clear sight of the screen but lacks the functionality to do a calibration when its single camera cannot capture all parts of the screen from its viewing position.The algorithm developed uses point transfer between camera views to supply the camera in the viewing position with enough information to make a suitable calibration even for the regions of the screen it cannot capture itself.A program has been developed, showing that it is possible to do this projector calibration for situations where up to half of the screen is occluded from the intended viewing position, with a result that is not notably worse than when using the single camera algorithm for similar situations with clear sight of the screen. It might be possible to run the algorithm with less than half the screen visible from the viewing position, but an upper limit of how much of the screen can be occluded with an accepted result has not been found.The algorithm should be usable with any pair of cameras, and any projector, and does not assume that the cameras are stereo calibrated beforehand. However in the testing done in this thesis, camera images with resolution 640x480 have been used, and the displayed projector images have had the resolution 256x192 in the calibration.Huvudmålet med detta examensarbete var att konstruera en metod för att automatiskt kalibrera en projektor till att projicera bilder på en kurvad skärm, på så sätt att bilderna som projiceras på skärmen inte ser deformerade ut från en viss åskådarposition. Eftersom målet var att kunna använda metoden för att kalibrera projektorerna i en flygsimulator, där den tilltänkta åskådarpositionen har en något skymd sikt över skärmen, behövde metoden hantera detta problem på något sätt, och den föreslagna lösningen var att använda två kameror för att genomföra kalibreringen; en kamera i den tilltänkta åskådarpositionen och en kamera i en annan position, med en friare sikt över skärmen.Detta arbete är en utvidgning av en sedan tidigare existerande algoritm för projektorkalibrering, som använder en ensam kamera i den tilltänkta åskådarpositionen och utvecklades 2013, genom att funktionalitet för att använda multipla kameror har lagts till. Den tidigare algoritmen, som detta arbete är en utvidgning av, presterar bra i tillämpningar då den tilltänkta åskådarpositionen har fri sikt över skärmen, men fungerar inte alls om den ensamma kameran är det minsta skymd och inte kan fånga alla delar av skärmen på film.Algoritmen som föreslås i detta arbete använder punktöverföring mellan kameravyer för att förse huvudkameran i den tilltänkta åskådarpositionen med tillräcklig information om områden som den inte kan se själv för att kunna göra en lämplig kalibrering av projektorn med avseende på hela skärmen.Ett program har utvecklats, för att visa att det är möjligt att genomföra en sådan projektorkalibrering även för situationer då upp till halva projektorskärmen är skymd från den tilltänkta åskådarpositionen, med resultat som inte är märkbart sämre än vad som uppnås då åskådarpositionen har fri sikt över skärmen och således kan använda algoritmen för en ensam kamera för en i övrigt identisk uppställning. Det kan mycket väl vara möjligt att ha sikt över betydligt mindre än halva skärmen, men fokus har inte lagts på att hitta en övre gräns på hur stora delar av skärmen som kan vara skymd och ändå generera ett acceptabelt resultat för projektorkalibreringen.Den föreslagna algoritmen ska gå att använda med två godtyckliga kameror och vilken projektor som helst, och den utgår inte ifrån att kamerorna är stereo-kalibrerade i förhand. I testandet som har gjorts för detta examensarbete har dock kameror med upplösning 640x480, och projektorbilder med upplösning 256x192 använts.
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Hoch, Stefan Ludwig. "State stability analysis for the fermionic projector in the continuum." kostenfrei, 2008. http://www.opus-bayern.de/uni-regensburg/volltexte/2008/1010/.
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Lo, Po-Kai, and 駱柏凱. "An Automatic Projection Integration System for the Projector Array." Thesis, 2015. http://ndltd.ncl.edu.tw/handle/70894552086607290272.
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碩士國立中興大學
電機工程學系所
103
Current development of technology has involved integrating large, high-definition screens into people’s daily life, and projector technology is highly developed. Because projectors not only feature high resolution imaging, but are also easy to carry, this study employed a multi-projector system to achieve high definition output on a large screen by using C language and DirectX. In Chapter 1, we introduce the conventional multi-projector system and propose a solution to the numerous problems that it incurs in the form an automatic projection integration system. When projections from multiple projectors are combined, they become distorted because of improper projector placement, and bright regions typically appear because of overlaps in the projections. An edge blending technique, gamma correction, and homography matrix are proposed to solve these two problems in Chapter 2. C language and an automatic projection integration system can be used to achieve real-time high-quality output, desktop screen capture, and reduced costs. This goal can be achieved using DirectX, Direct Show, and Direct 3D.We introduce DirectX, Direct Show, and Direct 3D in Chapter 3. The system flow of automatic and manual calibration of the multi-projector system is introduced in Chapter 4. A webcam is used to capture the point of projection border, and a homography matrix is used, as described in Chapter 2, to calibrate the distortion of projection. Bright regions are then removed by applying the edge blending technique. Finally, the maximum actual region size of projections can be used to combine after calibration of the multi-projector system. In addition, a graphical user interface designed using DirectX can be used to manually merge and calibrate a multi-projector system. In Chapter 5, experiments were performed to verify the automatic projection integration system and the results are reported.
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Cao, Xiang. "Handheld projector interaction." 2009. http://link.library.utoronto.ca/eir/EIRdetail.cfm?Resources__ID=968387&T=F.
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Pan, Kwang-Ping, and 潘光平. "LCD Type Projector." Thesis, 1998. http://ndltd.ncl.edu.tw/handle/56071383513520653001.
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Hsu, Hsin-Chi, and 徐信吉. "Portable Infrared Projector." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/3e3zkh.
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碩士逢甲大學
電機工程學系
106
Infrared dynamic scene simulation is key equipment for the military hardware in the environment simulation system. It plays an important role in the current military industry. Every time a military product test is conducted, the infrared system must provide the target and the background real infrared scene. Infrared guidance or observation systems are placed in real environments. Experiments with real targets are very expensive, and due to actual conditions, unpredictable meteorological conditions, different targets, and different environments, using background infrared radiation characteristics and infrared thermal scenes, can provide a convenient, feasible, and inexpensive detection method for seeker performance testing. It can not only provide infrared for different targets under different weather conditions and different radiation backgrounds. Features and thermal images comprehensively test the performance of the seeker. The purpose of this study is to develop a portable, dynamic, 256-gray black-and-white and a low-cost digital infrared projector. The system is composed of five elements; an illumination lens, a DMD, a projection lens, drive circuit, and an infrared scene generating computer. Use PWM to generate 256 gray level black and white images. The high-resolution infrared camera is used to capture the projection image of IR DLP which analyzes by the image analysis program. The experiment result shows that the 25*25 pixel dynamic image produces.
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Shiao-Hua, Lu, and 盧孝華. "Laser Scan Projector." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/07573641345446473951.
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Chu, Chung-Jen, and 朱崇仁. "RED COLOR ENHANCED PROJECTION LAMP DRIVER FOR COLOR SEPARATE PROJECTOR." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/44786725560959133171.
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碩士國立成功大學
微電子工程研究所碩博士班
93
Recently, micro display systems, especially, the Digital Light Processor (DLP) developed by TI based on MEMS technology, have been developed successfully for video projection applications. For the application, the color manage system is the key technology and has been studied extensively. In general, red, green and blue-three colors are separated sequentially, as the output light of projection lamp passes through color wheel in one chip DLP projector. Then the three colors are managed to generate a color image by the synchronized Digital Light Processor. However, due to the inherent weak intensity of red light in the color spectrum of conventional projection lamp, result in the degraded red color performance. In this thesis, we try to enhance the red color by only setting parameters of firmware in projection lamp driver and to optimize the color design with less cost and developing time. Firstly, we study the operation principle of general projection lamp driver and develop the mechanism of red color enhanced projection lamp driver. Then use the DLP Composer to simulate and modify the mechanism. Finally, design and test the red color enhanced projection lamp driver system. Experimental results evidence the developed lamp driver not only possesses the higher output of red color and improves the color performance of projection system, but also is feasible for real application in color separate projector.
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Li, Jiunn-Her, and 黎俊和. "Introduction of LCD Projector Development and Research on DLP Projector Optical Engine." Thesis, 2003. http://ndltd.ncl.edu.tw/handle/47236651326888803526.
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碩士國立交通大學
機械工程系
91
The development of projection system and equipment are improved significantly in the last few years thanks to the prosperous progress of the projection technology. The projector operation principle is the same as overhead projectors and slide projectors. The image of pictures or texts shown on the white wall or screen is projected through a high-illuminated light bulb. In terms of micro projection panel type, the projectors can be divided into 3 different categories. There are High temperature polysilicon (HTPS) transmissive LCD panel type, Digital Light Processing (DLP) type utilizing Digital Micromirror Device (DMD) chip which is developed by TI, and Liquid Crystal on Silicon (LCOS) which is regarded as the most promising design after a couple of years. The transmissive LCD projector approximately penetrates the projector market. Therefore most manufacturers in Taiwan nowadays are focusing on developing DLP or LCOS projectors as the start. Concerning the safety and stability issues of the products, it is very important to control the optical engine cooling. The solution provided in this thesis is increasing the vents in order to keep the temperature of the projector within the safety level. Thus, the stability of the projector is considerably improved and the possible thermal problems are eliminated for the future development of new projectors.
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Zhuang, Ming-yin, and 莊明穎. "Camera-projector presentation system." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/31368324191961360232.
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碩士國立中山大學
資訊工程學系研究所
93
As the popularity of the digital Web-cam，these devices are more and more cheaper and powerful. We can apply computer vision techniques with camera and projector to build a more convenient presentation system. In presentation, sometimes due to the position of projector, the images appear the perspective distortion (keystone distortion). The user should manually adjust the position of projector or use the keystone corrections of the projector. But when the distortion is not trapezium, the built-in keystone corrections are not suitable in this situation. We present a computer-vision based method that uses a Web-cam to calibrate the keystone distortion. The Web-cam takes the images that the projector projected on the wall. If the Web-cam observes keystone distortions of the projected images, we use a geometric transform that pre-warps the images in the projector frame, such that these images appears rectangle with known aspect ratio after being projected on the wall. Besides, we implement the virtual buttons that allow users to interact with the computer. The virtual buttons means that when the camera detect the laser point is on the virtual buttons, computer triggers the event as the virtual button being pushed. This paper uses point-matching pairs to obtain the homography between camera image frame and source image frame. The homography, that is the fundamental of calibrating perspective distortions also help us to search the position of the laser point.
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Chuang, Yuan-Ming, and 莊元銘. "Panorama Multiple Projector Processor." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/70835133192344513492.
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碩士國立中興大學
電機工程學系所
98
Friendly price, large-screen, and high quality of resolution and colorfulness make projectors appear not only in exhibitions and meeting rooms but also in classrooms and home theaters. This shows that projectors have become commercial manufactures from professional products. Therefore, how to improve the application of projectors turns into one of the most important topics these years. First, the chapter one of this paper discusses the available systems of multi-projectors-geometric-correction, but most of them use either computer-retouching or high performance graphic processors which are highly dependent on computers and very expansive. To improve the situation this paper provide a solution which models curved projecting surface on the lateral surface of cylindroid and implements the system of multi-projectors-geometric-correction with low-cost hardware. Either a gap between the images or a double bright seam usually appears when sewing multiple projection images. “Edge Blending” is introduced in chapter two to remove the double bright seam. This technique decreases the pixel in overlap region of each projector to make the projection smooth. In addition, the structure and optics properties of projectors are mentioned in this chapter, too. The distortion of projections on non-plat surface is first described in chapter three. Through the properties of projectors, we construct a projection model which takes the lateral surface of cylindroid as projecting surface and develop a geometric correction algorithm. Further, we modify the model to make it more practical and develop an algorithm with more generality. To reduce the operation, the algorithm is simplified, but the operation is still too complex to implement, therefore the look-up-table is proposed. We introduce our system in the last of this chapter. In chapter four, the results of simulations and practical projecting experiments are demonstrated. The experimental results in chapter four and the drawback of the algorithm are discussed in chapter five. The conclusion and future work are also proposed in this chapter, too. This paper provides a solution which implements the system of multi-projectors-geometric-correction. This system reduces not only the dependence on computers but also the limitation from the projecting surrounding. We expect that the results of this study will provide a wide application for projectors.
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Chung, Chin-Lin, and 張君霖. "The development of profile projector." Thesis, 1995. http://ndltd.ncl.edu.tw/handle/30422714343571853318.
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Ho, Tsanyu, and 何璨佑. "Liquid Crystal Display Optical Projector." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/58785366220711341673.
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碩士國立中央大學
光電科學研究所
89
In this study, optical projector and liquid crystal display are combined to make a liquid crystal display optical projector. It gets data or image form of outside objects by computer or CCD Camera. Then it sends to the liquid crystal panel and projects the image form by using the optical elements of the projector. Furthermore, it can move the liquid crystal panel, computer and CCD Camera away. And instead, a transparency can be inserted in directly to be used an optical projector. The light source is very important. And the driver circuit is not a traditional linear power supply. It changes to a smaller size and highly efficient of the switched-mode power supply. The heat produced by the light source will damage the liquid crystal panel, so the radiator of the system is the key point. At last, we will measure the image, the light output, contrast ratio and uniformity form of the projector.
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"Projector-based interactive visual processing." Thesis, 2011. http://library.cuhk.edu.hk/record=b6075187.
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Motivated by these problems, we explore the potential of projectors in interactive information visualization and processing in this thesis. In particular, we make three contributions. First, we propose a computer vision solution for direct 3D object exhibition and manipulation without the user wearing spectacles. In our approach, a new 3D display interface is designed by projecting images on a hand-held foam sphere which can be moved freely by the user. By tracking the motion of the sphere and projecting motion-dependent images onto the sphere, a virtual 3D perception can be created. Using this interface, the user will experience as if he is holding the real object in hands and be able to control the viewing angle freely.Second, we extend the projection on traditional rigid screen to projection on flexible surfaces. A new flexible display method is proposed, which can project information on a hand-held flexible surface (e.g. an ordinary white paper with a checker pattern at the back) that can be twisted freely. While the user twists the projection surface, the system recovers the deformation of the surface and projects well-tailored information onto the surface corresponding to the deformation. As a result, the viewer will see the information as if it was printed on the paper. Two applications, the flexible image projection and curvilinear data slicing are created to demonstrate the usefulness of the method. After the studies on fixed-position projection, we conduct an investigation on mobile projectors, which is becoming especially necessary with the rapid popularity of mobile projectors. We propose a hand-held movable projection method that can freely project keystone-free content onto a general flat surface without any markings or boundaries on the displaying screen. Compared with traditional static projection systems that keep the projector and screen in fixed positions, our projection scheme can give the user greater freedom of display control while producing undistorted images at the same time.
The recent trend of human-computer interaction technologies has revealed the potential of the projector as an powerful interaction tool. More than a pure display tool, a projector has great strength that can change largely the way a traditional user interface works. Although some possibilities have been investigated in previous work, certain applications and approaches deserve further studies. For example, 1) Projection showing 3D information: viewing 3D models is usually achieved by projecting polarized light of different phases for left and right eyes, and the user is required to wear specially designed spectacles. The cost of building such a system is high. 2) Projection on flexible surface: most existing systems display information on flat rigid projection screens, extending it to non-planar flexible surfaces is an interesting and useful research direction; 3) Direct user-info interaction: existing systems using mouse and screen have limited freedom of control and low level of user experience. Direct manipulation of the display object by the hands of a user is more natural; 4) Mobile projector display: portable or embedded projectors are becoming more and more popular, but some fundamental problems, e.g. the keystone correction, are not fully studied.
To verify the correctness of our methods, we built prototype systems using off-the-shelf devices and conducted extensive experiments, including both simulation and real experiments. The results show that the proposed methods are effective and good performance has been achieved. In particular, the real-time speed and low-cost requirement make it quite appealing in many application areas, such as education, digital games, medical applications etc. Capitalizing on the shrinking size, increasing portability, and decreasing cost of projectors, it is predictable that projector-based interactive processing will become more and more popular in the near future. We believe the research work in this thesis will provide a good foundation for further research and development on computer vision and projector-based applications.
Li, Zhaorong.
Adviser: Kin-Hong Wong.
Source: Dissertation Abstracts International, Volume: 73-06, Section: B, page: .
Thesis (Ph.D.)--Chinese University of Hong Kong, 2011.
Includes bibliographical references (leaves 133-142).
Electronic reproduction. Hong Kong : Chinese University of Hong Kong, [2012] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. [Ann Arbor, MI] : ProQuest Information and Learning, [201-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Electronic reproduction. Ann Arbor, MI : ProQuest Information and Learning Company, [200-] System requirements: Adobe Acrobat Reader. Available via World Wide Web.
Abstract also in Chinese.
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Tsai, Tsai-Ling, and 蔡采玲. "Projector Hanger Analysis and Design." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/96462010813357674976.
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Ma, Chao-hui, and 馬超慧. "Pocket Size LED Projector Design." Thesis, 2010. http://ndltd.ncl.edu.tw/handle/27163153417172028090.
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碩士國立中央大學
光電科學研究所
98
At present, all design of communication systems, digital camera, camcorder and projector et cetera were requested with the smallest volume, convenient and carry-on product. It would be best that a machine including multi function such as communication, photograph,and video, broadcast and share with friends. Since many years the mobile device has made much progress in size. Similarly the size of projector devices is demanded smaller from mini,pocket to Pico size which is significant to integrate into mobile device and other 3C product. As this requisition, we need to think about not only the size but also the power consumption of all key parts at first priority when designing the projector device. In this thesis, for the light source we used the Red, Green and Blue LED with collimator to replace the conventional lamp, reflector and color wheel due to LED light source is the low power consumption, do not need to cool down with fan when the users turn on and off and reduce the size of the light source system. For illumination system we used lens array to take the place of Rod for reduces the total track of illumination system and to get high uniformity above 82%. For light separator, we use a new type TIR prism design which combines the projection lens and illumination system to decrease the volume and improve thecontrast of the projector.For the projection system, we used 8 elements such as 6 Spherical lenses and 2 Aspherical lenses to design the telecentric lens with 52 mm of the total track and do the evaluation and analyze the tolerance of the lenses with Code V optical software. Finally we use the ASAP optical software to simulate the system of the power efficiency and uniformity.
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CHEN, CHIEN-CHIH, and 陳知堅. "Mini-Projector Lens Optical Design." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/35rxfa.
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碩士大同大學
機械工程學系(所)
95
Abstract There are three projection displays technologies in industry, including LCD,LCOS ,and DMD light-valve projector. Portative projection display will become main stream in market .In this thesis ,using a optical simulation program ,Zemax, to release the optical projector seidel Aberrations and the chromatic Aberrations。The modifying of a patent US4726667, which the LCD projector larger semi-diameter contacted to portative projection lens special specification and used two aspheric surfaces to optimize aberrations balance and approach solution fast.
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Wei-Shian, Yeh. "Multi-Resolution Display Using Steerable Projector." 2007. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-1801200717255800.
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SAN-LUNG, KU, and 顧善隆. "System design of laser pico-projector." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/21390006658246875378.
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碩士臺北城市科技大學
嵌入式系統產業研發碩士專班
100
Pico projector can be an external equipment of 3C products such as cell phone, digital camera, i-pod, i-pad, etc. which can not be shared or entertained with others just because limited by screen size. It solves the size problem through projecting a big enough screen. Pico projector can be carried by businessmen to process prompt presentation or be shared the video or audio with friends by new generations; more further, it can integrate various mobile electronic devices like cell phone, digital camera, NB, i-pod, video, PDA and palm game machine, etc. to achieve the goals of pleasure, sharing and working. Plus the concept of creative multiple screens and combinative projector, we can develop immense practical market and industrial value. Consumer groups include business users who need to present in a small space and young generation who love to share pictures and movies immediately. This thesis has mentioned few issues. First is about how to design a system driver equipment of laser optical engine (using laser diode as a light source and MEMS mirror to scan the light deviation.) Because MEMS mirror dose not scan the light deviation by sequence but by Lissajous, the major consideration is the cooperation of projector point calculation and hardware. Second is driver system design (driver of MEMS mirror and laser diode.) Others are going to reveal more in the thesis.
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Li, Meng-Che, and 李孟哲. "Micro DLP Projector with Laser Illuminator." Thesis, 2009. http://ndltd.ncl.edu.tw/handle/90796414238543037474.
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碩士國立清華大學
動力機械工程學系
97
Abstract The rapid evolution of digital projector technology in the recent years, one of the major trends is light, thin, and small portable projector. The research is an extended work based on Texas Instruments Inc. DLP (Digital Light Processing) projection technology which discusses the feasibility on how to shrink optical system in non-imaging and imaging optical designs. Another key feature is exploiting laser instead of conventional UHP lamp as the illuminator. During the experiment, the prototype is modified from an existing commercial DLP projector bought from the projector market. The laser projector should be able to project image on the wall after the modification. The article will describe the detail process of the integration including optical simulation to design a small achromat doublet projection lens, laser illuminator design, laser beam shaping, and electronic controller design to control lasers in color-sequential mode. Eventually, evaluate the each performance index after the laser projector is successfully in operation.
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Pan, Jui-Wen, and 潘瑞文. "High Efficiency Pocket Size LED Projector." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/64798396732217272041.
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博士國立中央大學
光電科學研究所碩士在職專班
96
Nowadays, the advance of communication systems and portable devices such as the personal digital assistants (PDAs) and mobile-phones enrich our daily life. These communication systems make the transference of video information possible; miniaturization of portable devices lets us watch live programs online anytime, anywhere. lthough the improvement in size of the mobile devices has made much progress, the size of projector devices are still needed significant miniaturizations. Beside their overly large size, the current projectors still have several other disadvantages such as high power onsumption, noisy fans and delay when switching on and off. improvements need to be made in order to match other portable devices. In this thesis, a compact LED light source is used in place of conventional lamps, which makes for power conservation and faster on-off delay time. After combining this light source with a novel TIR prism, projection lens and illumination system , a reduction in the size of the whole system became possible. Moreover, the advantages of LED light source projection systems mean that primary colors can be created by the LED instead of being laboriously filtered from a white light source. The typical color gamut can be as much as above 120% over the sRGB standard [1-3]. In this thesis, we propose a pocket-size projector system with compact size of 75mm × 67 mm × 42 mm. For the LED light source, there are three discrete red, green, and blue (RGB) color LED sources. The size of the light source module is 30mm × 30 mm × 20 mm. The volume of the light source is only 18cm3, meaning a reduction in the size of the entire light source system of 60% that of a traditional light source module. Beside the volume issue, the collimating lens lets the collecting efficiency reach to 95 % at the divergence angle of 12.5 degree. For the illumination system, we use the micro lens array as intensity homogenizer. It can not only reduce the total track of illumination system but also reach high uniformity degree with 93%. For the light separator, we use a novel TIR prism design to replace the tradition TIR prism. The prism is consist of two triangle prisms .The novel prism can not only reduce the size of light separator but also increase the contrast ratio to 3700: 1 for whole system. For the projecting lens, a compact telecentric lens with a total track of 42mm is also developed. The MTF value of the lens can reach 0.5 at the spatial frequency of 36lp/mm. It will offer a sharpness image quality. The RMS spot size was controlled under 13.6 um2 for all fields. The fale phenomenon can’t be seen for the projected image. The optical distortion and TV distortion were controlled under 0.5%. The distortion phenomenon can’t visible by humen eye. The optical performance of this telecentric lens are better than that of the traditional designs. Moreover, the projection lens and the illumination system are designed independently via telecentric conditions. This thesis supports a detail description about LED projector with the projection lens, LED light source system with collimation parts, novel TIR prism and homogenizer. The efficiency and color performance are also discussed.
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Yeh, Wei-Shian, and 葉韋賢. "Multi-Resolution Display Using Steerable Projector." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/67532865312912884808.
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碩士國立臺灣大學
資訊工程學研究所
95
In this paper, we proposed a multi-resolution display system that is designed in accordance with human visual perception system. Research on human visual perception system had conducted studies on the spatial variation in human visual resolution. Their studies had shown that only the fovea region of human eyes can afford sharp vision with acute visual details. In comparison, peripheral region of human eyes perceives rough percipience of the world with coarse visual details. Similarly, our multi-resolution display system projects a large low-resolution area and a high-resolution sub-view by a fixed projector system and a steerable projector system. By the steerable projector, the high-resolution sub-view can move to various positions on the large display to “enhance” a certain local area. We have shown in this paper that the technologies for calibrating and interacting with this system. We design an user interface for a user to interact with the multi-resolution display by using a laser pointer to direct the projection of the steerable projector. Three experiments are introduced to demonstrate the system. A user study is done to evaluate the performance of our system. The system has great potential to be combined with various techniques to develop practical or interesting applications.
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Huang, Po-Tsung. "e-Fovea:Multi-Resolution Projector-Camera System." 2008. http://www.cetd.com.tw/ec/thesisdetail.aspx?etdun=U0001-2107200812063100.
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Ning, Yi, and 寧毅. "Bluetooth Photo E-dictionary Projector Pen." Thesis, 2017. http://ndltd.ncl.edu.tw/handle/2w9h6u.
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碩士國立中央大學
通訊工程學系在職專班
106
This work deals with an e-dictionary pen which can translate an English vocabulary on the paper into a Chinese one and project it on the same place. Notice that, compared with the same products on the market, we present a low cost solution, also notice that we enhance user-friendliness and convenience. The developed e-dictionary pen is functioned as scanning an English vocabulary on ink paper by an optical lens in front of the pen, transforming the read texts string into grey level images, and relaying the images to a smartphone via a Bluetooth interface embedded in the pen. Adopting the Optical Character Recognition(OCR) Application Programming Interface(API) within smartphones, text strings are recognized from the relayed images, translated into coded Chinese vocabulary, transferred into bitmap images, and sent back to the pen through the same interface. After receiving the bitmap images, e-dictionary pen will project it on ink paper. It has shown that, in order to cut the cost of an e-dictionary pen, we eliminate all expensive components by making use of functions and databank of smartphones to process all required complex algorithms. It has shown that an e-dictionary pen is only an I/O device which results in friendly and convenient for users.
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Huang, Po-Tsung, and 黃博聰. "e-Fovea:Multi-Resolution Projector-Camera System." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/84019790418714512898.
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碩士國立臺灣大學
資訊工程學研究所
96
In this paper, we proposed the e-Fovea, a multi-resolution projector-camera system. This system is designed in accordance with human visual perception system. Research on human visual perception system had conducted studies on the spatial variation in human visual resolution. Their studies had shown that only the fovea region of human eyes can afford sharp vision with acute visual details. In comparison, peripheral region of human eyes perceives rough percipience of the world with coarse visual details. Similarly, our system composed of a multi-resolution input channel and output display. The multi-resolution input channel consists of a wide-angle camera and a speed-dome camera. The multi-resolution output display consists of a fixed projector and a steerable projector. By the steerable projector, the high-resolution sub-view can move to various positions on the large display to “enhance” a certain local area. We want to create a cost-effective, attentive user interface that can help reduce human operator’s cognitive loads during their monitoring tasks. Two experiments are introduced to demonstrate the system. A user study is done to evaluate the performance of our system. We have shown in this thesis that the layout of the system and the technologies for the geometric calibrating input and output devices.
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陳柏安. "Numerical Analysis of a DLP Projector." Thesis, 2004. http://ndltd.ncl.edu.tw/handle/56096113946124568508.
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碩士國立臺灣科技大學
機械工程系
93
Due to its compact size and high-resolution video output, digital light processor (DLP) video projector has become more popular in the current market. However, reducing projector size generates a problem of more heat dissipation being crowded into less space and leads to the need for an effective heat removal mechanism. As a result, this numerical investigation is aimed to examine and enhance the thermal management of a DLP projector. At first, numerical simulation on a DLP projector is performed by using a CFD code. Later, the detailed velocity, pressure, and temperature distributions are visualized numerically and utilized to identify the components in which their temperatures are higher than the thermal-design limitations stated in DLP products thermal design guide. These high-temperature regions include color-wheel motor, cooling fan, and exhaust fan. Furthermore, based on this numerical outcome, several modifications are proposed to improve the flow patterns associated with these ill-design portions. Among them, the appropriate guide plate is added to prevent the airflow circulation within the projector that causes extreme temperatures for components in the affected area. Also, extra open vent area is placed near the inlet region of cooling fan to reduce the system resistance and ensure that the airflow is replaced by the cooler intake air. Thereafter, numerical simulations are executed to validate the corresponding improvements generated by those new alternatives. In conclusion, simulation results show that significant temperature drops (roughly 30~45℃) on color-wheel motor and cooling fans are achieved.
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Jordan, Samuel James. "Projector-Camera Calibration Using Gray Code Patterns." Thesis, 2010. http://hdl.handle.net/1974/5911.
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A parameter-free solution is presented for data projector calibration using a single camera and Gray coded structured light patterns. The proposed method assumes that both camera and projector exhibit significant non-linear distortion, and that projection surfaces can be either planar or freeform. The camera is calibrated first through traditional methods, and the calibrated images are then used to detect Gray coded patterns displayed on a surface by the data projector. Projector to camera correspondences are created by decoding the patterns in the camera images to form a 2D correspondence map. Calibrated systems produce geometrically correct, ex- tremely short throw projections, while maintaining or exceeding the projection size of a standard configuration. Qualitative experiments are performed on two baseline images, while quantitative data is recovered from the projected image of a chessboard pattern. A typical throw ratio of 0.5 can be achieved with a pixel distance error below 1.Thesis (Master, Electrical & Computer Engineering) -- Queen's University, 2010-06-29 09:33:50.311
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Lin, Pei-Shiun, and 林佩勳. "Effects of Content Types and Projection Distances on User Preferences of Micro-projector Displays." Thesis, 2013. http://ndltd.ncl.edu.tw/handle/77ryzf.
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碩士國立臺北科技大學
工業工程與管理系碩士班
101
With the evolution of projection technology, micro-projectors have been rapid developed. Its applications range from conventional stand-alone sets to embedment in portable devices. However most of the research on micro projection technology has mainly been related to the applications with mobile phones but not to the design of user interfaces or user experience. Therefore, this study aims to understand whether content types and projection distances have significant impacts on user subjective preferences. There were three contents types and six projection distances as the independent variables, participants’ responses on their preferences as the dependent variable. A repeated-measures ANOVA was used to analyze the date. A brief question was also asked after the experiment to understand participants’ rationale behind their responses. Results showed that significant effects on user preferences were found from the different projection distances and from the interactions between the projection distances and the content types, but not from the different content types. Projection distance in one meter had the highest preference, due to its screen size and the level of brightness. For the interaction effects, user preferred static pictures to dynamic video in one-meter projection distance. However, this preference was reversed in the distance of two meters. Results of the question after the experiment have confirmed that the sizes and levels of brightness primary factors to influence user preferences. It is believed that the findings of this study will help industry to better understand the needs of users, so that it can better meet the technology development and application market demand.
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Liu, Chang-Yen, and 劉昌彥. "Projector Brightness and Uniformity Analysis and Countermeasure." Thesis, 2008. http://ndltd.ncl.edu.tw/handle/74776055318723223512.
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碩士元智大學
電機工程學系
96
This thesis is mainly to study the improvement for analysis and countermeasure on projector brightness and uniformity. Taguchi methods[6] were used to analyze for component quality of projector system. Sensitivity of noise factor of projector brightness and uniformity is reduced by parameter design. Under different noise factors, we search the best control factor. The variability of the projector quality characteristics of brightness and uniformity is reduced. Parameter design takes the orthogonal array to do the experiment. According to the characteristics of the problem, the number of quantity factors and the number of level factors, we use orthogonal arrays to find interaction effects between different factors of the output response for the best design. The sensitivity of variability factor of technology, products and process is reduced to minimize manufacturing cost. We can get the systematic optimization by parameter design of brightness and uniformity in projector system.
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Kuo, Ming-Huang, and 郭名晃. "Autostereoscopic 3D Display With Proximity Projector Array." Thesis, 2007. http://ndltd.ncl.edu.tw/handle/72562387763646847923.
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碩士國立清華大學
光電科技產業研發碩士專班
95
Three dimensional display is the major effort toward natural vision in the development of display technology. Current 3D display suffers from the issues of low resolution and narrow viewing angle due to the availability of high performance key components, which results in low acceptability of 3D displays in the consumer market. In this research, a novel concept of constructing high resolution and wide viewing angle autostereoscopic 3D display by using proximity projector array has been proposed for solving the issue with currently available technology. A pixel size down to a few tens micro can be achieved by projecting microdisplay with low magnification ratio, and a large screen can be made by tiling up an array of such projected screen. Accompanying with slant lenticular array, it becomes possible to make a high resolution and wide viewing angle 3D displays. The major work of the research are the design and evaluation on the proximity projection optics, and optimization of slant lenticular array. In this research, the single proximity projection optics has been designed with the MTF value up to 32% at the spatial frequency of 64lp/mm and the greatest distortion value smaller than 0.1% which value is in between half to one pixel size. Besides to polarization beam splitter, all the lens are made of plastic optics materials, such as PC and COC, and therefore it can be potentially fabricated with low cost.
50
Liao, Hao-Yen, and 廖浩延. "Thermal Analysis of a Mini LED Projector." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/09049756955036063522.
Full textAbstract:
碩士國立臺灣海洋大學
機械與機電工程學系
99
Owing to improvement of the optical engine technology and use of LEDs as the light source, the projectors have been downsized greatly. As such, the mobility of the projectors increases significantly. However, the LED operating temperature is much lower than traditional lamps. To prevent damage of the LED projectors from high temperature and to increase the life cycle, thermal control and sufficient cooling is essential. In this paper, flow and thermal fields inside an LED projector are studied by conducting experimental measurement and numerical simulation with the code Flotherm. Both experimental and numerical results are compared. The effect of each cooling component is investigated via removal or adjustment of the component. It is found that heat accumulation and low speed vortices appear within the projector. Several approaches are adopted to resolve these problems, including installation of a partition, optimization of fin heat sinks, and change of size and location of the chassis openings. The best of combinations of these approaches is found for improving heat dissipation. The operating temperature of the red LED is the lowest among the RGB LEDs, and hence more attention should be given to the red LED in the thermal design, compared with green and blue LEDs. Use of an insulation pad is helpful in that it can protect the heat-sensitive components from being exposed to hot air and users from injury upon touching the components. The slit in the fins can cause nonuniformity of temperature distribution. Another effect is air leakage and thus decreasing the air flow and the heat dissipated. Based on the cost and associated benefit, the suggested approaches for improvement in cooling in descending order are installation of a partition to prevent recirculation of hot air due to waste heat, adjustment of location of chassis openings, and optimization of fin heat sinks. Final results after improvement indicate temperature drops of green, blue, and red LEDs of 4.5℃, 4.37℃, and 3.68℃, and DMD and DLP chips of 4.3℃ and 5.28℃, respectively.