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Добірка наукової літератури з теми "Video projector"

Автор: Grafiati

Опубліковано: 24 липня 2022

Оновлено: 8 серпня 2022

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Статті в журналах з теми "Video projector"

Sharma, Atul, Sushil Raut, Kohei Shimasaki, Taku Senoo, and Idaku Ishii. "Visual-Feedback-Based Frame-by-Frame Synchronization for 3000 fps Projector–Camera Visual Light Communication." Electronics 10, no. 14 (July 8, 2021): 1631. http://dx.doi.org/10.3390/electronics10141631.

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Анотація:

This paper proposes a novel method for synchronizing a high frame-rate (HFR) camera with an HFR projector, using a visual feedback-based synchronization algorithm for streaming video sequences in real time on a visible-light communication (VLC)-based system. The frame rates of the camera and projector are equal, and their phases are synchronized. A visual feedback-based synchronization algorithm is used to mitigate the complexities and stabilization issues of wire-based triggering for long-distance systems. The HFR projector projects a binary pattern modulated at 3000 fps. The HFR camera system operates at 3000 fps, which can capture and generate a delay signal to be given to the next camera clock cycle so that it matches the phase of the HFR projector. To test the synchronization performance, we used an HFR projector–camera-based VLC system in which the proposed synchronization algorithm provides maximum bandwidth utilization for the high-throughput transmission ability of the system and reduces data redundancy efficiently. The transmitter of the VLC system encodes the input video sequence into gray code, which is projected via high-definition multimedia interface streaming in the form of binary images 590 × 1060. At the receiver, a monochrome HFR camera can simultaneously capture and decode 12-bit 512 × 512 images in real time and reconstruct a color video sequence at 60 fps. The efficiency of the visual feedback-based synchronization algorithm is evaluated by streaming offline and live video sequences, using a VLC system with single and dual projectors, providing a multiple-projector-based system. The results show that the 3000 fps camera was successfully synchronized with a 3000 fps single-projector and a 1500 fps dual-projector system. It was confirmed that the synchronization algorithm can also be applied to VLC systems, autonomous vehicles, and surveillance applications.

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Nicolas, Christophe, Jean-Baptiste Leprince, and Jean-Pierre Huignard. "Stereoscopic LCD video projector." Journal of the Society for Information Display 2, no. 4 (1994): 165. http://dx.doi.org/10.1889/1.1984927.

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Ymauchi, K., H. Kanayama, T. Miwa, K. Takeuchi, N. Nakatani, and Y. Marusita. "High resolution LC video projector." IEEE Transactions on Consumer Electronics 36, no. 3 (1990): 430–36. http://dx.doi.org/10.1109/30.103156.

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von Jungenfeld, Rocio. "Portable Projections: Analyzing Cocreated Site-Specific Video Walks." Leonardo 53, no. 5 (October 2020): 492–97. http://dx.doi.org/10.1162/leon_a_01794.

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Анотація:

The author discusses key findings of a series of video walks developed as part of her practice-based PhD research (2011–2014). Four video walks were produced for handheld projectors and tested in four different public spaces. The first video walks ( The Surface Inside, 2011; I-Walk, 2012) were guided, and only one handheld projector was available. The latter ( Walk-itch, 2013; (wh)ere land, 2014) were created for multiple handheld projectors, offering participants a cocreative role. Onsite observations revealed a shift in participant engagement between earlier and later video walks. A threefold method for analyzing audiovisual documentation also emerged during the research.

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Kalisperakis, Ilias, Lazaros Grammatikopoulos, Elli Petsa, and George Karras. "A Structured-Light Approach for the Reconstruction of Complex Objects." Geoinformatics FCE CTU 6 (December 21, 2011): 259–66. http://dx.doi.org/10.14311/gi.6.32.

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Анотація:

Recently, one of the central issues in the fields of Photogrammetry, Computer Vision, Computer Graphics and Image Processing is the development of tools for the automatic reconstruction of complex 3D objects. Among various approaches, one of the most promising is Structured Light 3D scanning (SL) which combines automation and high accuracy with low cost, given the steady decrease in price of cameras and projectors. SL relies on the projection of different light patterns, by means of a video projector, on 3D object sur faces, which are recorded by one or more digital cameras. Automatic pattern identification on images allows reconstructing the shape of recorded 3D objects via triangulation of the optical rays corresponding to projector and camera pixels. Models draped with realistic phototexture may be thus also generated, reproducing both geometry and appearance of the 3D world. In this context, subject of our research is a synthesis of state-of-the-art as well as the development of novel algorithms, in order to implement a 3D scanning system consisting, at this stage, of one consumer digital camera (DSLR) and a video projector. In the following, the main principles of structured light scanning and the algorithms implemented in our system are presented, and results are given to demonstrate the potential of such a system. Since this work is part of an ongoing research project, future tasks are also discussed.

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Sharma, Atul, Sushil Raut, Kohei Shimasaki, Taku Senoo, and Idaku Ishii. "HFR Projector Camera Based Visible Light Communication System for Real-Time Video Streaming." Sensors 20, no. 18 (September 19, 2020): 5368. http://dx.doi.org/10.3390/s20185368.

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Анотація:

This study develops a projector–camera-based visible light communication (VLC) system for real-time broadband video streaming, in which a high frame rate (HFR) projector can encode and project a color input video sequence into binary image patterns modulated at thousands of frames per second and an HFR vision system can capture and decode these binary patterns into the input color video sequence with real-time video processing. For maximum utilization of the high-throughput transmission ability of the HFR projector, we introduce a projector–camera VLC protocol, wherein a multi-level color video sequence is binary-modulated with a gray code for encoding and decoding instead of pure-code-based binary modulation. Gray code encoding is introduced to address the ambiguity with mismatched pixel alignments along the gradients between the projector and vision system. Our proposed VLC system consists of an HFR projector, which can project 590 × 1060 binary images at 1041 fps via HDMI streaming and a monochrome HFR camera system, which can capture and process 12-bit 512 × 512 images in real time at 3125 fps; it can simultaneously decode and reconstruct 24-bit RGB video sequences at 31 fps, including an error correction process. The effectiveness of the proposed VLC system was verified via several experiments by streaming offline and live video sequences.

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Draréni, Jamil, Sébastien Roy, and Peter Sturm. "Methods for geometrical video projector calibration." Machine Vision and Applications 23, no. 1 (March 12, 2011): 79–89. http://dx.doi.org/10.1007/s00138-011-0322-3.

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Drouin, Marc-Antoine, Pierre-Marc Jodoin, and Julien Prémont. "Camera–projector matching using unstructured video." Machine Vision and Applications 23, no. 5 (July 31, 2011): 887–902. http://dx.doi.org/10.1007/s00138-011-0358-4.

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Dussan Molinos, Laura, Cord Huchzermeyer, Robert Lämmer, Jan Kremers, and Folkert K. Horn. "Blue–Yellow VEP with Projector-Stimulation in Glaucoma." Graefe's Archive for Clinical and Experimental Ophthalmology 260, no. 4 (November 25, 2021): 1171–81. http://dx.doi.org/10.1007/s00417-021-05473-w.

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Анотація:

Abstract Background and aim In the past, increased latencies of the blue-on-yellow pattern visually evoked potentials (BY-VEP), which predominantly originate in the koniocellular pathway, have proven to be a sensitive biomarker for early glaucoma. However, a complex experimental setup based on an optical bench was necessary to obtain these measurements because computer screens lack sufficient temporal, spatial, spectral, and luminance resolution. Here, we evaluated the diagnostic value of a novel setup based on a commercially available video projector. Methods BY-VEPs were recorded in 126 participants (42 healthy control participants, 12 patients with ocular hypertension, 17 with “preperimetric” glaucoma, and 55 with perimetric glaucoma). Stimuli were created with a video projector (DLP technology) by rear projection of a blue checkerboard pattern (460 nm) for 200 ms (onset) superimposed on a bright yellow background (574 nm), followed by an offset interval where only the background was active. Thus, predominantly S-cones were stimulated while L- and M-cone responses were suppressed by light adaptation. Times of stimulus onset to VEP onset-trough (N-peak time) and offset-peak (P-peak time) were analyzed after age-correction based on linear regression in the normal participants. Results The resulting BY-VEPs were quite similar to those obtained in the past with the optical bench: pattern-onset generated a negative deflection of the VEP, whereas the offset-response was dominated by a positive component. N-peak times were significantly increased in glaucoma patients (preperimetric 136.1 ± 10 ms, p < 0.05; perimetric 153.1 ± 17.8 ms, p < 0.001) compared with normal participants (123.6 ± 7.7 ms). Furthermore, they were significantly correlated with disease severity as determined by visual field losses retinal nerve fiber thinning (Spearman R = –0.7, p < 0.001). Conclusions Video projectors can be used to create optical stimuli with high temporal and spatial resolution, thus potentially enabling sophisticated electrophysiological measurements in clinical practice. BY-VEPs based on such a projector had a high diagnostic value for detection of early glaucoma. Registration of study Registration site: www.clinicaltrials.gov Trial registration number: NCT00494923.

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Jing, Chang Long, Qi Bin Feng, Ying Song Zhang, Guang Lei Yang, Zhi Gang Song, Zhi Qi Pei, and Guo Qiang Lv. "LED-Based 3-DMD Volumetric 3D Display." Applied Mechanics and Materials 596 (July 2014): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amm.596.442.

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Анотація:

A solid-state volumetric true 3D display developed by Hefei University of Technology consists of two main components: a high-speed video projector and a stack of liquid crystal shutters. The shutters are based on polymer stabilized cholesteric texture material, presenting different states that can be switched by different voltage. The high-speed video projector includes LED-based light source and tree-chip digital micro-mirror devices modulating RGB lights. A sequence of slices of three-dimensional images are projected into the liquid crystal shutters locating at the proper depth, forming a true 3D image depending on the human vision persistence. The prototype is developed. The measurement results show that the screen brightness can reach 149 nit and no flickers can be perceived.

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Більше джерел

Дисертації з теми "Video projector"

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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Bokaris, Panagiotis-Alexandros. "Video-projected augmented reality : Photometric compensation for static and dynamic concealment." Thesis, Université Paris-Saclay (ComUE), 2016. http://www.theses.fr/2016SACLS453/document.

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Анотація:

Cette thèse développe de nouvelles approches pour l'effacement et la révélation de la présence humaine en utilisant des techniques de réalité augmentée. Elle se concentre sur les systèmes projecteur-caméra (ProCams) et leur application dans les «projections intelligentes», où le contenu virtuel projeté est adapté en fonction de l'environnement. Nous nous appuyons sur les travaux antérieurs sur la compensation photométrique pour projeter sur une surface colorée fixe qui permet au spectateur d'observer la même image telle qu'elle apparaîtrait sur une surface blanche. Malgré les différentes méthodes de compensation des couleurs qui ont été proposées au cours de décennie, la compensation appliquée à monde réel avec des couleurs saturées et vives est encore une question ouverte. L'objectif principal de ce travail est la compensation photométrique sur un objet 3D en mouvement en utilisant un ProCam, ce qui est un scénario considérablement plus difficile. Une nouvelle méthode pour la compensation de couleur à l'aide d'une image d'entrée unique est proposée. Elle consiste à estimer la réflectance spectrale de la surface afin de compenser celle-ci en supposant que les réponses du projecteur sont connues ou mesurées précédemment. Cette méthode a été entièrement développée sur GPU pour permettre une compensation en temps réel. Les méthodes antérieures sur la compensation couleur sont discutées et comparées afin d'évaluer la performance de notre technique. L'étalonnage photométrique et géométrique précis d'un ProCam est essentiel pour une compensation précise. Une nouvelle technique de calibration géométrique entre un capteur de profondeur et un ProCam est présentée dans le but de réaliser la projection sur un objet en mouvement. Une calibration photométrique est décrite pour la transformation des valeurs RGB de la caméra et du projecteur (dépendantes du périphérique) vers l'espace couleur CIE XYZ 1931 (indépendantes du périphérique). Le potentiel artistique des techniques de réalité augmentée proposées est en outre exploré à travers l'installation interactive artistique “Gardien du Temple”. La révélation et l'effacement ont toujours été un terrain d'expérimentation commun aux artistes et aux scientifiques. Cette installation audiovisuelle utilise la réalité augmentée pour effacer la présence d'un poème écrit sur un tapis invitant le spectateur à le révéler. Dans de telles applications, la précision et la robustesse des méthodes utilisées sont cruciales. Cette installation artistique a donc permis de tester et d'évaluer les travaux de cette thèse dans un contexte collaboratif et exigeant
This thesis develops new approaches for human presence concealment and revelation using augmented reality techniques. It focuses on projector-camera systems (ProCams) and their application in “smart projections”, where the projected virtual content is adapted according to the environment. One previously-studied problem is the photometric compensation for projecting on a colored fixed surface that allows the viewer to observe the same image as it would appear on a white surface. Despite the various methods for color compensation that have been proposed the last decade, compensation on a real-world surface with saturated colors and sharp color boundaries is still an open issue. The main objective of this work is the color compensation on a moving 3D object using a ProCam, which is a dramatically more challenging scenario. A novel method for color compensation using a single input frame is proposed. It consists in estimating the spectral reflectance of the surface in order to compensate for it under the assumption that the projector responses are known or previously measured. This method was fully developed on GPU to enable real-time compensation. Previous methods on color compensation are discussed and compared in order to evaluate the performance of our technique. The accurate photometric and geometric calibration of a ProCam is essential for precise compensation. A new geometric calibration technique between a depth sensor and a ProCam is presented in order to make the projection on a moving object feasible. A photometric calibration is described for the transformation of the device-dependent camera and projector values to the device-independent CIE XYZ 1931 color space. The artistic potential of the proposed augmented reality techniques is further explored through the interactive art installation “Gardien du Temple”. Revelation and concealment has always been a common experimentation ground for both artists and scientists. This audio visual installation uses augmented reality to hide the presence of a written poem on a carpet inviting the spectator to reveal it. In such applications, the accuracy and robust performance of the methods employed is crucial and, thus, it offered a challenging ground for testing and evaluation

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Setkov, Aleksandr. "IVORA (Image and Computer Vision for Augmented Reality) : Color invariance and correspondences for the definition of a camera/video-projector system." Thesis, Université Paris-Saclay (ComUE), 2015. http://www.theses.fr/2015SACLS168/document.

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Анотація:

La Réalité Augmentée Spatiale (SAR) vise à superposer spatialement l'information virtuelle sur des objets physiques. Au cours des dernières décennies ce domaine a connu une grande expansion et est utilisé dans divers domaines, tels que la médecine, le prototypage, le divertissement etc. Cependant, pour obtenir des projections de bonne qualité, on doit résoudre plusieurs problèmes, dont les plus importants sont la gamme de couleurs réduite du projecteur, la lumière ambiante, la couleur du fond, et la configuration arbitraire de la surface de projection dans la scène. Ces facteurs entraînent des distorsions dans les images qui requièrent des processus de compensation complémentaires.Les projections intelligentes (smart projections) sont au cœur des applications de SAR. Composées d'un dispositif de projection et d'un dispositif d'acquisition, elles contrôlent l'aspect de la projection et effectuent des corrections à la volée pour compenser les distorsions. Bien que les méthodes actives de Lumière Structurée aient été utilisées classiquement pour résoudre ces problèmes de compensation géométrique, cette thèse propose une nouvelle approche non intrusive pour la compensation géométrique de plusieurs surfaces planes et pour la reconnaissance des objets en SAR s'appuyant uniquement sur la capture du contenu projeté.Premièrement, cette thèse étude l'usage de l'invariance couleur pour améliorer la qualité de la mise en correspondance entre primitives dans une configuration d'acquisition des images vidéoprojetées. Nous comparons la performance de la plupart des méthodes de l'état de l'art avec celle du descripteur proposé basé sur l'égalisation d'histogramme. Deuxièmement, pour mieux traiter les conditions standard des systèmes projecteur-caméra, deux ensembles de données de captures de projections réelles, ont été spécialement préparés à des fins expérimentales. La performance de tous les algorithmes considérés est analysée de façon approfondie et des propositions de recommandations sont faites sur le choix des algorithmes les mieux adaptés en fonction des conditions expérimentales (paramètres image, disposition spatiale, couleur du fond...). Troisièmement, nous considérons le problème d'ajustement multi-surface pour compenser des distorsions d'homographie dans les images acquises. Une combinaison de mise en correspondance entre les primitives et de Flux Optique est proposée afin d'obtenir une compensation géométrique plus rapide. Quatrièmement, une nouvelle application en reconnaissance d'objet à partir de captures d'images vidéo-projetées est mise en œuvre. Finalement, une implémentation GPU temps réel des algorithmes considérés ouvre des pistes pour la compensation géométrique non intrusive en SAR basée sur la mise en correspondances entre primitives
Spatial Augmented Reality (SAR) aims at spatially superposing virtual information on real-world objects. Over the last decades, it has gained a lot of success and been used in manifold applications in various domains, such as medicine, prototyping, entertainment etc. However, to obtain projections of a good quality one has to deal with multiple problems, among them the most important are the limited projector output gamut, ambient illumination, color background, and arbitrary geometric surface configurations of the projection scene. These factors result in image distortions which require additional compensation steps.Smart-projections are at the core of PAR applications. Equipped with a projection and acquisitions devices, they control the projection appearance and introduce corrections on the fly to compensate distortions. Although active structured-light techniques have been so far the de-facto method to address such problems, this PhD thesis addresses a relatively new unintrusive content-based approach for geometric compensation of multiple planar surfaces and for object recognition in SAR.Firstly, this thesis investigates the use of color-invariance for feature matching quality enhancement in projection-acquisition scenarios. The performance of most state-of-the art methods are studied along with the proposed local histogram equalization-based descriptor. Secondly, to better address the typical conditions encountered when using a projector-camera system, two datasets of real-world projections were specially prepared for experimental purposes. Through a series of evaluation frameworks, the performance of all considered algorithms is thoroughly analyzed, providing several inferences on that which algorithms are more appropriate in each condition. Thirdly, this PhD work addresses the problem of multiple-surface fitting used to compensate different homography distortions in acquired images. A combination of feature matching and Optical Flow tracking is proposed in order to achieve a more low-weight geometric compensation. Fourthly, an example of new application to object recognition from acquired projections is showed. Finally, a real-time implementation of considered methods on GPU shows prospects for the unintrusive feature matching-based geometric compensation in SAR applications

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Draréni, Jamil. "Exploitation de contraintes photométriques et géométriques en vision : application au suivi, au calibrage et à la reconstruction." Grenoble, 2010. http://www.theses.fr/2010GRENM061.

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Анотація:

Cette thèse s'intéresse à trois problèmes fondamentaux de la vision par ordinateur qui sont le suivi vidéo, le calibrage et la reconstruction 3D. Les approches proposées sont strictement basées sur des contraintes photométriques et géométriques présentent dans des images 2D. Le suivi de mouvement se fait généralement dans un flux vidéo et consiste à suivre un objet d'intérêt identifié par l'usager. Nous reprenons une des méthodes les plus robustes à cet effet et l'améliorons de sorte à prendre en charge, en plus de ses translations, les rotations qu'effectue l'objet d'intérêt. Par la suite nous nous attelons au calibrage de caméras ; un autre problème fondamental en vision. Il s'agit là, d'estimer des paramètres intrinsèques qui décrivent la projection d'entités 3D dans une image plane. Plus précisément, nous proposons des algorithmes de calibrage plan pour les caméras linéaires (pushbroom) et les vidéo projecteurs lesquels étaient, jusque-là, calibrés de façon laborieuse. Le troisième volet de cette thèse sera consacré à la reconstruction 3D par ombres projetée. À moins de connaissance à priori sur le contenu de la scène, cette technique est intrinsèquement ambigüe. Nous proposons une méthode pour réduire cette ambiguïté en exploitant le fait que les spots de lumières sont souvent visibles dans la caméra
The topic of this thesis revolves around three fundamental problems in computer vision; namely, video tracking, camera calibration and shape recovery. The proposed methods are solely based on photometric and geometric constraints found in the images. Video tracking, usually performed on a video sequence, consists in tracking a region of interest, selected manually by an operator. We extend a successful tracking method by adding the ability to estimate the orientation of the tracked object. Furthermore, we consider another fundamental problem in computer vision: calibration. Here we tackle the problem of calibrating linear cameras (a. K. A: pushbroom)and video projectors. For the former one we propose a convenient plane-based calibration algorithm and for the latter, a calibration algorithm that does not require aphysical grid and a planar auto-calibration algorithm. Finally, we pointed our third research direction toward shape reconstruction using coplanar shadows. This technique is known to suffer from a bas-relief ambiguity if no extra information on the scene or light source is provided. We propose a simple method to reduce this ambiguity from four to a single parameter. We achieve this by taking into account the visibility of the light spots in the camera

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Lee, Donggeol. "Culture shock : video interview project." Virtual Press, 2007. http://liblink.bsu.edu/uhtbin/catkey/1371470.

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Анотація:

This project is for Rinker Center for International Programs at Ball State University to provide useful information to international and American students. The project consists of ten video interviews with the director of Rinker Center for International Programs and nine international students presenting Ghana, France, Germany, Mexico, Brazil, Japan, China, Taiwan, and Turkey. Each interviewee provides cultural differences between American culture and their cultures. In addition, the interviewees tell their personal solutions for coping with cultural difficulties based on their experiences in the United States or different cultures. The director was given three questions and the nine international students were asked ten questions.Each video interview is categorized under country menus and question menus designed with Adobe Macromedia Flash 8 to be navigated by clicking each menu button on a computer.
Department of Telecommunications

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Vatsella, Christina. "La question de l'espace dans l'installation vidéo." Thesis, Paris 4, 2012. http://www.theses.fr/2012PA040269.

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Анотація:

Ayant comme point de départ les premières expérimentations de Nam June Paik avec les téléviseurs au début des années 1960, cette étude suit l’évolution historique de l’installation vidéo en parcourant cinq décennies de création. La problématique de l’espace, fil conducteur de cette recherche, nous amène d’abord à la constitution d’une typologie. Fruit de l’étude de l’évolution des formes principales de l’installation vidéo, cette classification a pour objet l’œuvre sous sa forme aboutie, c’est-à-dire installée. Néanmoins, cet état n’est que le résultat final d’un long processus. Divisée en quatre étapes, l’étude de la mise en espace de l’œuvre soulève des questions cruciales liées à l’acquisition, l’exposition et la conservation de l’installation vidéo. Une fois que l’œuvre est installée, elle s’articule autour d’un espace-temps virtuel, celui de l’image vidéographique, et d’un espace-temps réel, celui du dispositif plastique, analysés dans la troisième et dernière partie. Cette étude met l’accent sur la dimension historique de l’installation vidéo tout en la contextualisant au sein de l’histoire de l’art du vingtième siècle
Having as a starting point Nam June Paik’s experimentations with televisions in the early 1960s, this essay traces the history of the video installation spanning five decades. The question of space is the basic thread of the analysis. It has led to the constitution of a typology that examines the evolution of the main forms of the video installation. This classification focuses on the artwork that is already installed. However, this state is the outcome of a complicated procedure. Divided into four steps and thoroughly examined, this process raises some crucial questions concerning the acquisition, the exposition and the conservation of the video installation. When installed, the artwork acquires two spatiotemporal dimensions, namely the virtual space and time of the video image and the real space and time of the installation, both analysed in the third chapter. This essay stresses the historical aspect of the video installation by situating it within the broader context of the 20th century history of art

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Lin, Ching-Ping. "Streaming video for parental involvement education." CSUSB ScholarWorks, 2003. https://scholarworks.lib.csusb.edu/etd-project/2473.

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Анотація:

The purpose of this project is to develop a way of communication between school and parents. It aims to help parents to be more involved in their children's education. One of the main aspects and focus of this project is the analysis of the use of streaming video.

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Pommeray, Michel. "Etude d'un vidéoprojecteur laser stéréoscopique." Valenciennes, 1995. https://ged.uphf.fr/nuxeo/site/esupversions/9fd20f01-dce5-49a3-b087-e8faf2cfc241.

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After a review of the main three-dimensional display techniques, this report proposes a study of a laser videoprojector, which allows the two images of a stereo-pair to be seen simultaneously. The left and right images correspond to two orthogonal polarization directions of the laser beam. So, for each pixel, an intensity and a polarization angle are computed from the pixel intensities of the left and right images. At restitution, special polarizing glasses worn by the viewer decode the polarized images to provide the left and right eye views. As images are projected in waves of four lines to reduce the rotation speed of the polygonal mirror doing horizontal scanning, the laser beam is diffracted by a multifrequency acousto-optic modulator. The linearization of the diffraction efficiencies is realized by the introduction of an additional acoustic carrier. A suitable anisotropic interaction greatly reduces the multiple rediffraction effects. The polarization angle of the light beams stemming from the acousto-optic component can not be modulated independently by the electro-optic modulator. A study of the image degradation, in both spatial and frequency domains, is presented, in case the intensities are averaged over two successive lines of a screen for each image. Next a second method, indemnifing the absence of ghost images and minimizing the mean square error, is analysed, then compared to the previous one with the help of a set of numerical results and simulations
Près une analyse des principales techniques de restitution du relief, ce mémoire propose l'étude d'un vidéoprojecteur laser, autorisant la visualisation simultanée des deux images d'un couple stéréoscopique. Les images gauche et droite du couple correspondent à deux directions de polarisation orthogonales du faisceau laser. Ainsi, pour chaque pixel, une intensité et un angle de polarisation sont calcules a partir des intensités des pixels des images gauche et droite. A la restitution, les lunettes a verres polarises orthogonalement, portées par le spectateur, adressent a chaque il l'image qui lui est destinée. La projection des images s'effectuant par paquet de quatre lignes, de manière a réduire la vitesse de rotation du miroir polygonal assurant le balayage horizontal, le faisceau laser est diffracte et module en intensité par un composant acousto-optique multifréquence. La linéarisation des rendements de diffraction de ce dernier est réalisée par l'adjonction d'une voie supplémentaire, dite de compensation. Les phénomènes d'intermodulation sont réduits par le choix d'une coupe acoustique particulière dans la paratellurite. Le modulateur électro-optique ne permet pas la modulation indépendante de l'angle de polarisation des faisceaux lumineux issus du composant acousto-optique. Une étude, dans le domaine spatial et fréquentiel, de la dégradation des images, qui s'en suit, est présentée dans le cas ou les intensités sont moyennées sur deux lignes consécutives d'une trame, pour chaque image. Une seconde méthode, minimisant l'erreur quadratique moyenne, est ensuite analysée, puis comparée à la précédente à l'aide d'un ensemble de résultats numériques et de simulations

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Lin, Ruisheng. "Projection of video images from phase-only holograms." Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610252.

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Wang, Tianzi. "Use video to disseminate : How to produce a video for a research project?" Thesis, KTH, Skolan för elektroteknik och datavetenskap (EECS), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-265551.

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Nowadays, scholars are encouraged to use video for research dissemination. In most of the EU and national research projects, it is the hard requirement that the project results need to be disseminated to the public in multiple channels, e.g. video, webpage, etc. Thus the general aim of this master thesis research has arisen from this challenge faced by scholars, who normally have limited experience in the media production workflow and collaborating with video producers. To bridge the gap between researchers and media experts, better workflow guidance on production management is needed. In this study, the literature on three conventional video production management methods is reviewed and compared, aiming to identify the advantage and disadvantage of the methods for the research project video production. Emerging from the key findings, a novel management model is developed to meet the needs of researchers. Meanwhile, a logic workflow is proposed accordingly. The proposed approach is implemented and evaluated with a case study on a real video production project for a research centre at KTH. The limitation of the study is discussed in the end, with the suggestion given on further research.
Idag uppmanas forskare att använda video för forskningsförmedling. I de flesta EU-och nationella forskningsprojekt är det ett hårt krav att projektresultaten måste sprida sig till allmänheten via flera kanaler, t.ex. video, webbsida etc. Således har den generella målsättningen med detta examensarbete uppstått på grund av denna utmaning som forskare står inför, som normalt sett har begränsad erfarenhet av medieproduktionsarbete och av samarbete med videoproducenter. För att överbrygga klyftan mellan forskare och medieexperter behövs bättre arbetsflödesledning för produktionsledning. I denna studie granskas litteraturen för tre konventionella videoproduktionshanteringsmetoder och jämförs för att identifiera fördelar och nackdelar med metoderna för ett forskningsprojekts videoproduktion. En ny ledningsmodell har utvecklats för att möta forskarnas behov. Under tiden föreslås ett logiskt arbetsflöde. Det föreslagna tillvägagångssättet genomförs och utvärderas med en fallstudie gällande ett verkligt videoproduktionsprojekt för ett forskningscenter vid KTH. Begränsningen av studien diskuteras i slutet, med förslag på vidare forskning.

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Книги з теми "Video projector"

Hutchinson, Tom. Project video. Oxford: Oxford University Press, 1991.

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Hutchinson, Tom. Project video. Oxford: Oxford UniversityPress, 1992.

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Hutchinson, Tom. Project video 2. Oxford: Oxford University Press, 1992.

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The art of projectionism. Wien: Czernin Verlag, 2008.

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Bergquist, Carl J. The video hacker's handbook: Electronic projects for video enthusiasts. Indianapolis, IN: Prompt Publications, 1997.

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Bergman, Robert E. Managing interactive video/multimedia projects. Englewood Cliffs, N.J: Educational Technology Publications, 1990.

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Caporali, Enrica, and Vladimir Trajkovik, eds. Video Conference as a tool for Higher Education. Florence: Firenze University Press, 2012. http://dx.doi.org/10.36253/978-88-6655-108-9.

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The book describes the activities of the consortium member institutions in the framework of the TEMPUS IV Joint Project ViCES - Video Conferencing Educational Services (144650-TEMPUS-2008-IT-JPGR). In order to provide the basis for the development of a distance learning environment based on video conferencing systems and develop a blended learning courses methodology, the TEMPUS Project VICES (2009-2012) was launched in 2009. This publication collects the conclusion of the project and it reports the main outcomes together with the approach followed by the different partners towards the achievement of the project's goal. The book includes several contributions focussed on specific topics related to videoconferencing services, namely how to enable such services in educational contexts so that, the installation and deployment of videoconferencing systems could be conceived an integral part of virtual open campuses.

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Caporali, Enrica, and Vladimir Trajkovik, eds. ViCES - Video Conferencing Educational Services Main Project Outcomes. Florence: Firenze University Press, 2012. http://dx.doi.org/10.36253/978-88-6655-118-8.

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This e-book has been developed as result of the Video Conference Educational Service (ViCES) project under the TEMPUS action of the European Commission (144650-TEMPUS-2008-IT-JPGR. It is intended to serve as a set of guidelines for the setup and usage of videoconference tools in educational and vocational training institutions. It also offers suggestions to: companies, agencies and institutions that plan to introduce video conferencing based training experiences. The e-book covers both technical and organizational issues related to video conferencing educational services, such as: Learning Methodology Guideline, Non functional Requirements Recommendation, Organizational Structure & Business Processes Recommendation, Service Level Agreement Recommendation, Video Conferencing Service Sustainability Strategy, and Video Conferencing end Station Basic Tutorial.

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Schouten, Dirk. Media action projects: A model for integrating video in project-based education, training and community development. Nottingham: Urban Programme Research Group, University of Nottingham, 1997.

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Dreier, Troy. CNET Do-It-Yourself Home Video Projects. New York: McGraw-Hill, 2007.

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Частини книг з теми "Video projector"

Kobayashi, Shuhei, Fumihiko Sakaue, and Jun Sato. "Multiple View Geometry of Projector-Camera Systems from Virtual Mutual Projection." In Advances in Image and Video Technology, 1070–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92957-4_93.

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Leischner, Vojtěch, and Zdenek Mikovec. "Video Projection on Transparent Materials." In Digital Interaction and Machine Intelligence, 145–52. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-11432-8_14.

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AbstractWe propose a new coating for light projection on transparent materials that can open new possibilities for design. What we often struggle with is the lighting of clear glass. By definition, clear glass lets most of the light pass through. We have found a way to turn glass surfaces opaque or transparent by using ultraviolet (UV) fluorescence coating. In combination with a UVA light source, we can project the dynamic content onto a glass surface treated with a special coating that transforms the UVA light into visible light. The added benefit of such a coating is that it can be applied to any organically shaped surface using a spray gun, not just flat surfaces. Another advantage is that the light source is nearly invisible to the human eye, especially with a UV light pass-through filter. We have created a prototype with a modified overhead projector to measure the light characteristics and documented the steps to reproduce our results.

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Furukawa, Ryo, Masahito Naito, Daisuke Miyazaki, Masahi Baba, Shinsaku Hiura, Yoji Sanomura, Shinji Tanaka, and Hiroshi Kawasaki. "Auto-calibration Method for Active 3D Endoscope System Using Silhouette of Pattern Projector." In Image and Video Technology, 222–36. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-75786-5_19.

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Okazaki, Tomoya, Takayuki Okatani, and Koichiro Deguchi. "Shape Reconstruction by Combination of Structured-Light Projection and Photometric Stereo Using a Projector-Camera System." In Advances in Image and Video Technology, 410–22. Berlin, Heidelberg: Springer Berlin Heidelberg, 2009. http://dx.doi.org/10.1007/978-3-540-92957-4_36.

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Stricker, Ronny, Steffen Müller, and Horst-Michael Gross. "Universal Usage of a Video Projector on a Mobile Guide Robot." In Intelligent Robotics and Applications, 25–36. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-22873-0_3.

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de Souza Filho, José Luiz, Roger Correia Silva, Dhiego Oliveira Sad, Renan Dembogurski, Marcelo Bernardes Vieira, Sócrates de Oliveira Dantas, and Rodrigo Silva. "Analysis of a High Definition Camera-Projector Video System for Geometry Reconstruction." In Computational Science and Its Applications – ICCSA 2012, 228–39. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-31125-3_18.

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Inoué, Shinya, and Kenneth R. Spring. "Video Monitors, Projectors, and Printers." In Video Microscopy, 383–439. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5859-0_10.

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Meyer, Jeanine. "Jigsaw Video." In HTML5 and JavaScript Projects, 291–319. Berkeley, CA: Apress, 2018. http://dx.doi.org/10.1007/978-1-4842-3864-6_8.

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Kuschel, Tim. "Projection." In The Live Event Video Technician, 71–92. New York: Focal Press, 2022. http://dx.doi.org/10.4324/9781003247036-8.

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Park, Hanhoon, Moon-Hyun Lee, Byung-Kuk Seo, Hong-Chang Shin, and Jong-Il Park. "Radiometrically-Compensated Projection onto Non-Lambertian Surface Using Multiple Overlapping Projectors." In Advances in Image and Video Technology, 534–44. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11949534_53.

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Тези доповідей конференцій з теми "Video projector"

Yamauchi, Kanayama, Miwa, Takeuchi, Nakatani, and Marushita. "High Resolution LCD Video Projector." In IEEE International Conference on Consumer Electronics. IEEE, 1990. http://dx.doi.org/10.1109/icce.1990.665928.

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Drareni, J., S. Roy, and P. Sturm. "Geometric video projector auto-calibration." In 2009 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR Workshops). IEEE, 2009. http://dx.doi.org/10.1109/cvpr.2009.5204317.

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Drareni, Jamil, Sebastien Roy, and Peter Sturm. "Geometric video projector auto-calibration." In 2009 IEEE Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2009. http://dx.doi.org/10.1109/cvprw.2009.5204317.

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Yoneno, Kunio, Yasushi Kurokawa, Kazuhiro Kaneko, Koichi Ara, and Kanazawa Masaru. "Multi-Sync Video/Data Projector." In OE/LASE '89, edited by Frederic J. Kahn. SPIE, 1989. http://dx.doi.org/10.1117/12.952841.

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Doshi, Rekha, and Eugene O. Curatu. "Zoom lens design for video projector." In Optical Science, Engineering and Instrumentation '97, edited by Ellis I. Betensky, Allen Mann, and Iain A. Neil. SPIE, 1997. http://dx.doi.org/10.1117/12.284240.

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Freeman, Jonathan P., Timothy D. Wilkinson, and Paul Wisely. "Visor projected HMD for fast jets using a holographic video projector." In SPIE Defense, Security, and Sensing, edited by Bahram Javidi, Jung-Young Son, John T. Thomas, and Daniel D. Desjardins. SPIE, 2010. http://dx.doi.org/10.1117/12.855020.

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Hiura, Shinsaku, Kenji Tojo, and Seiji Inokuchi. "3-D tele-direction interface using video projector." In the SIGGRAPH 2003 conference. New York, New York, USA: ACM Press, 2003. http://dx.doi.org/10.1145/965400.965525.

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Drouin, Marc-Antoine, Pierre-Marc Jodoin, and Julien Premont. "Camera-projector matching using an unstructured video stream." In 2010 IEEE Computer Society Conference on Computer Vision and Pattern Recognition Workshops (CVPR Workshops). IEEE, 2010. http://dx.doi.org/10.1109/cvprw.2010.5543474.

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Baker, Harlyn, and Zeyu Li. "Camera and Projector Arrays for Immersive 3D Video." In 2nd International ICST Conference on Immersive Telecommunications. ICST, 2009. http://dx.doi.org/10.4108/icst.immerscom2009.6238.

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Minato, Yoshihiro, Takeshi Tsujimura, Kiyotaka Izumi, and Hiroki Fukushima. "Laser luminance pointing system superposed upon video projector image." In 2012 IEEE/SICE International Symposium on System Integration (SII 2012). IEEE, 2012. http://dx.doi.org/10.1109/sii.2012.6427301.

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Звіти організацій з теми "Video projector"

Matzner, Shari, Colleen K. Trostle, Garrett J. Staines, Ryan E. Hull, Andrew Avila, and Genevra EL Harker-Klimes. Triton: Igiugig Video Analysis - Project Report. Office of Scientific and Technical Information (OSTI), February 2016. http://dx.doi.org/10.2172/1485061.

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Saifoloi, Malama, Evangelia Papoutsaki, Marcus Williams, Usha Sundar Harris, and Munawwar Naqvi. Participatory Video and the Pacifica Mamas: A Pilot Project. Unitec ePress, August 2016. http://dx.doi.org/10.34074/emed.044.

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Emerging literature highlights that in the Pacific, the use of participatory video (PV) is a new trend in research and community action. It can be employed as a tool to empower communities to have agency over their media outputs, meaning that they have full control of the content creation, production and distribution processes. But to date there is still a dearth of studies that fully explore its potential use in different contexts, especially within diasporic networks. To address this gap, a pilot project was undertaken where PV methodologies were tested in collaboration with a diasporic Pacific community group based in West Auckland, New Zealand. This report feeds back on the overall process of developing the pilot project.

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Brickeen, B. K. Develop Solid State Laser Sources for High Resolution Video Projection Systems. Office of Scientific and Technical Information (OSTI), October 2000. http://dx.doi.org/10.2172/766163.

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George, Marianne, and David Lewis. The Subsistence Science and Video Project (SSVP). (Annual Summarizing Progress Report). Fort Belvoir, VA: Defense Technical Information Center, November 1994. http://dx.doi.org/10.21236/ada300948.

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Adolf, A., and P. MacAvock. A Uniform Resource Name (URN) Namespace for the Digital Video Broadcasting Project (DVB). RFC Editor, September 2008. http://dx.doi.org/10.17487/rfc5328.

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Chien, Stanley, Yaobin Chen, Lauren Christopher, Mei Qiu, and Zhengming Ding. Road Condition Detection and Classification from Existing CCTV Feed. Purdue University, 2022. http://dx.doi.org/10.5703/1288284317364.

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The Indiana Department of Transportation (INDOT) has approximately 500 digital cameras along highways in populated areas of Indiana. These cameras are used to monitor traffic conditions around the clock, all year round. Currently, the videos from these cameras are observed one-by-one by human operators looking for traffic conditions and incidents. The main objective of this research was to develop an automatic, real-time system to monitor traffic conditions and detect incidents automatically. The Transportation and Autonomous Systems Institute (TASI) of the Purdue School of Engineering and Technology at Indiana University-Purdue University Indianapolis (IUPUI) and the Traffic Management Center of INDOT developed a system that monitors the traffic conditions based on the INDOT CCTV video feeds. The proposed system performs traffic flow estimation, incident detection, and classification of vehicles involved in an incident. The research team designed the system, including the hardware and software components added to the existing INDOT CCTV system; the relationship between the added system and the currently existing INDOT system; the database structure for traffic data extracted from the videos; and a user-friendly, web-based server for showing the incident locations automatically. The specific work in this project includes vehicle-detection, road boundary detection, lane detection, vehicle count over time, flow-rate detection, traffic condition detection, database development, web-based graphical user interface (GUI), and a hardware specification study. The preliminary prototype of some system components has been implemented in the Development of Automated Incident Detection System Using Existing ATMS CCT (SPR-4305).

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Athey, J. E. An introduction to the Alaska Groundwater Quality Project: Naturally Occurring Contaminants (presentation and video): Alaska Water Well Association 2022 Conference, presented by video, Anchorage, Alaska, February 17-18, 2022. Alaska Division of Geological & Geophysical Surveys, February 2022. http://dx.doi.org/10.14509/30859.

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Adolf, A., and P. Siebert. Update to the Registrant Information for the Digital Video Broadcasting Project (DVB) Uniform Resource Name (URN) Namespace. RFC Editor, September 2014. http://dx.doi.org/10.17487/rfc7354.

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Johnson, Peter N., Michael D. Rayton, Bryan L. Nass, and John E. Arterburn. Enumeration of Salmonids in the Okanogan Basin Using Underwater Video, Performance Period: October 2005 (Project Inception) - 31 December 2006. Office of Scientific and Technical Information (OSTI), June 2007. http://dx.doi.org/10.2172/949218.

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Winseck, D. Growth and Upheaval in the Network Media Economy in Canada, 1984-2019. Canadian Media Concentration Research Project (CMCRP), Carleton University, November 2020. http://dx.doi.org/10.22215/cmcrp/2020.1.

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This report examines the development of the media economy over the past thirty-five years. Since beginning this project a decade ago, we have focused on analyzing a comprehensive as possible selection of the biggest telecoms, Internet and media industries (based on revenue) in Canada, including: mobile wireless and wireline telecoms; Internet access; cable, satellite & IPTV; broadcast television, specialty and pay television services as well as Internet-based video subscription and download services; radio; newspapers; magazines; music; Internet advertising; social media; operating systems; browsers, etc.

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