8,014 research outputs found

    Mobile graphics: SIGGRAPH Asia 2017 course

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    Peer ReviewedPostprint (published version

    Layered 3D: tomographic image synthesis for attenuation-based light field and high dynamic range displays

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    We develop tomographic techniques for image synthesis on displays composed of compact volumes of light-attenuating material. Such volumetric attenuators recreate a 4D light field or high-contrast 2D image when illuminated by a uniform backlight. Since arbitrary oblique views may be inconsistent with any single attenuator, iterative tomographic reconstruction minimizes the difference between the emitted and target light fields, subject to physical constraints on attenuation. As multi-layer generalizations of conventional parallax barriers, such displays are shown, both by theory and experiment, to exceed the performance of existing dual-layer architectures. For 3D display, spatial resolution, depth of field, and brightness are increased, compared to parallax barriers. For a plane at a fixed depth, our optimization also allows optimal construction of high dynamic range displays, confirming existing heuristics and providing the first extension to multiple, disjoint layers. We conclude by demonstrating the benefits and limitations of attenuation-based light field displays using an inexpensive fabrication method: separating multiple printed transparencies with acrylic sheets.Dolby Laboratories Inc.Samsung ElectronicsAlfred P. Sloan Foundatio

    Management and display of four-dimensional environmental data sets using McIDAS

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    Over the past four years, great strides have been made in the areas of data management and display of 4-D meteorological data sets. A survey was conducted of available and planned 4-D meteorological data sources. The data types were evaluated for their impact on the data management and display system. The requirements were analyzed for data base management generated by the 4-D data display system. The suitability of the existing data base management procedures and file structure were evaluated in light of the new requirements. Where needed, new data base management tools and file procedures were designed and implemented. The quality of the basic 4-D data sets was assured. The interpolation and extrapolation techniques of the 4-D data were investigated. The 4-D data from various sources were combined to make a uniform and consistent data set for display purposes. Data display software was designed to create abstract line graphic 3-D displays. Realistic shaded 3-D displays were created. Animation routines for these displays were developed in order to produce a dynamic 4-D presentation. A prototype dynamic color stereo workstation was implemented. A computer functional design specification was produced based on interactive studies and user feedback

    An Embedded Approach to Volumetric Displays

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    The goal of this capstone project was to design and create and test a functioning volumetric display system. This project created an embedded solution for a volumetric display that can perform the necessary data manipulations required to prepare and slice a three-dimensional object for so that it can be displayed in real space

    Angular and spatial light modulation by single digital micromirror device for multi-image output and nearly-doubled étendue

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    The "Angular Spatial Light Modulator" (ASLM) achieves simultaneous angular and spatial light modulation at a plane by combining Digital Micromirror Device (DMD) based programmable blazed grating beam steering and binary pattern sequencing. The ASLM system multiplies the number of effective output pixels of the DMD for increased spatial and/or angular degrees of freedom, and nearly-doubles the etendue output of the DMD. We implement multiple illumination and projection schemes to demonstrate ASLM-based extended FOV display, light-field projection, and multi-view display. We also implement time-multiplexed pupil segmented illumination to extend the pattern steering to two dimensions. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing AgreementUniversity of Arizona; Department of Defense (DoD) National Defense Science and Engineering Graduate (NDSEG); Air Force Research Laboratory (AFRL); ARCS FoundationOpen access journalThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at [email protected]

    From Capture to Display: A Survey on Volumetric Video

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    Volumetric video, which offers immersive viewing experiences, is gaining increasing prominence. With its six degrees of freedom, it provides viewers with greater immersion and interactivity compared to traditional videos. Despite their potential, volumetric video services poses significant challenges. This survey conducts a comprehensive review of the existing literature on volumetric video. We firstly provide a general framework of volumetric video services, followed by a discussion on prerequisites for volumetric video, encompassing representations, open datasets, and quality assessment metrics. Then we delve into the current methodologies for each stage of the volumetric video service pipeline, detailing capturing, compression, transmission, rendering, and display techniques. Lastly, we explore various applications enabled by this pioneering technology and we present an array of research challenges and opportunities in the domain of volumetric video services. This survey aspires to provide a holistic understanding of this burgeoning field and shed light on potential future research trajectories, aiming to bring the vision of volumetric video to fruition.Comment: Submitte

    State of the art 3D technologies and MVV end to end system design

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    L’oggetto del presente lavoro di tesi è costituito dall’analisi e dalla recensione di tutte le tecnologie 3D: esistenti e in via di sviluppo per ambienti domestici; tenendo come punto di riferimento le tecnologie multiview video (MVV). Tutte le sezioni della catena dalla fase di cattura a quella di riproduzione sono analizzate. Lo scopo è di progettare una possibile architettura satellitare per un futuro sistema MVV televisivo, nell’ambito di due possibili scenari, broadcast o interattivo. L’analisi coprirà considerazioni tecniche, ma anche limitazioni commerciali

    Magseal Leak Testing Device

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    Magnetic Seal Corp. has forged a reputable name for itself in the high performance seal industry. Despite great manufacturing practices and product quality, they strive to be even better. Their focus on product quality and cost efficiency lead them to the realization that understanding and fully characterizing porosity in their products was crucial. Due to the nature of the casting process, their magnetic housings inherently have some porosity. Despite thorough inspections upon receiving parts form vendors, porosity can, and often does appear below the surface after parts are machined. As such, a thorough understanding of how porosity effects leakage rates in their parts became essential in order to keep uphold the quality of manufactured parts and more accurately quantify their performance with respect to the standard. The Leakseekers were tasked with designing, manufacturing, and implementing a test rig capable of two things, namely isolating leakage to just the O-Ring - Seal interface, and accurately measuring any leakage past this interface. The information provided by the rig would effectively allow Magseal to more precisely determine the allowable limits of porosity on surfaces of interest, and in so-doing limit the amount of parts discarded due to a broad spectrum that determines whether a part fails inspection or not. Through the use of Financial Analysis, Engineering Analysis and tools like QDF, the team developed a modular design that, with the use of different adapters for different seals, could test a wide range of Magseal products. For optimal utility, the rig was designed with the capability of running 100 hour tests and adapting to multiple seal sizes. Heat, insulation, and pressure sub-systems were also used to ensure that the desired test parameters remained constant throughout the course of a test. An Arduino breadboard was programmed to control and regulate temperatures while an analog pressure system was employed to ensure the desired pressure. In addition to the rig, test and operation procedures, a maintenance manual, electrical system wiring diagrams, a pressure system diagram, and all final assembly CAD part and drawing files were given to the sponsor as deliverables
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