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About 10,000 papers for “Projector”

Projector

Bulletin of Miscellaneous Information (Royal Gardens Kew)

Cited by 0

Projector

Cardinal Scholar (Ball State University) · 1966

Cited by 0

Projector

HALEY, S · Minerva Access (University of Melbourne) · 2014

Cited by 0

Projector

Encyclopedia of Early Modern History Online · 2021

Cited by 0

Projector

Kevin Kreiser, Jingyi Yu, Depixelation Videos et al. · 2013

Abstract The screen-door effect or projector pixelation is a visual artifact produced by many digital projectors. In this paper, we present a real-time projector depixelation framework for displaying high resolution videos. To attenuate pixelation, we use the common defocusing approach of setting the projection a little out-of-focus. Using a camera-projector pair, our system efficiently measures the spatially-varying defocus kernel and stores it as a texture on the graphics hardware. We explore two novel techniques to compensate for the defocusing blur in real-time. First, we develop a steepest descent algorithm on the GPU for estimating the optimally deblurred video frames based on the measured defocus kernel. Second, we present a novel optical flow algorithm that uses an illumination ratio map (IRM) to model illumination transformations between consecutive frames. We store both the IRM and optical flow as textures. To process a frame at runtime, we use the textures to warp the optimized previous frame into an initialization for the iterative GPU optimization. We show that our GPU optimization achieves one magnitude acceleration using this warping. Experiments on various video clips show that our framework can realize real-time video playback with significantly reduced pixelation and defocus while preserving fine details and temporal coherence.

Cited by 0

projector

OKAMOTO, KENJI · Institutional Repository of Xi'an Institute of Optics and Fine Mechanics, Chinese Academy of Sciences (Xian Institute of Optics and Precision Mechanics) · 2016

A projector is provided, having a light source emitting a laser beam; an optical element, which the laser beam emitted by the light source passes through; a projection component, projecting an image onto a projection surface by irradiating the laser beam emitted from the optical element onto the projection surface while scanning. The optical element has an incident surface, where the laser beam emitted by the light source is incident; and an emitting surface, where the laser beam incident to the incidence surface is emitted. A first lens surface, shaping a beam shape of the laser beam from elliptic into circular by astigmatism generated in the laser beam, is formed on one of the incident and the emitting surfaces, and a second lens surface, converting the laser beam from a divergent beam into a parallel beam, is formed on the other one of the incident the emitting surfaces.

Cited by 0

Projector Illustration

Chapman University Digital Commons (Chapman University) · 2015

Illustration of the interior of a projector [unidentified]; may be using a color wheel with lens.

Cited by 0

Touch projector

Sebastian Boring, Dominikus Baur, Andreas Butz et al. · 2010

In 1992, Tani et al. proposed remotely operating machines in a factory by manipulating a live video image on a computer screen. In this paper we revisit this metaphor and investigate its suitability for mobile use. We present Touch Projector, a system that enables users to interact with remote screens through a live video image on their mobile device. The handheld device tracks itself with respect to the surrounding displays. Touch on the video image is projected onto the target display in view, as if it had occurred there. This literal adaptation of Tani's idea, however, fails because handheld video does not offer enough stability and control to enable precise manipulation. We address this with a series of improvements, including zooming and freezing the video image. In a user study, participants selected targets and dragged targets between displays using the literal and three improved versions. We found that participants achieved highest performance with automatic zooming and temporary image freezing.

Cited by 221

Anisotropic Projector

Robert B. Leighton · Review of Scientific Instruments · 1956

An optical projector having different magnifications, 5× and 50×, in two rectangular directions is described. Although the device is designed principally for rapid measurement of cloud-chamber track curvatures, it has been applied to various situations in which plane-to-plane imaging at constant magnification is desired. Simple plano-convex cylindrical lenses are used as the image-forming elements. These give quite satisfactory linearity and resolution at the maximum magnification.

Cited by 1Open access

Projector construction

Auer, Peter · OSF Preprints (OSF Preprints) · 2022

A projector construction is a syntactic construction which grammatically projects a(n) (often) complex continuation in the same turn. The term was coined by Paul Hopper and Susanne Günthner (2010) for certain cases of complex syntax in talk-in-interaction.

Cited by 0Open access

Projector Phones

Johannes Schöning, Markus Löchtefeld, Michael Rohs et al. · IGI Global eBooks · 2012

With the miniaturization of projection technology, the integration of tiny projection units into mobile devices is no longer fiction; therefore, such integrated projectors in mobile devices could make mobile projection ubiquitous. These phones will have the ability to project large-scale information onto any surfaces in the real world, and by doing so, the interaction space of the mobile device can be considerably expanded. In addition, physical objects in the environment can be augmented with additional information, which can support interaction concepts that are not even possible on modern desktop computers today. The authors believe that mobile camera-projector units can form a promising interface type for mobile Augmented Reality (AR) applications, thus, this paper identifies different application classes of such interfaces. In addition, different spatial setups of camera and projector units will have an effect on the possible applications and the interaction space with the focus on the augmentation of real word objects in the environment. This paper presents two examples of applications for mobile camera-projector units and different hardware prototypes that allow augmentation of real world objects.

Cited by 1

Baird Projector

Chapman University Digital Commons (Chapman University) · 2015

Cited by 0

Laser Projector

P. Svoboda · Digital Repository (National Repository of Grey Literature) · 2015

The aim of this thesis is to create a system, which draws the graphics with the help of a set laser project and eventually is able to synthetize several coloured rays and thus realise a multicolour drawing. The whole system is controlled by a Raspberry PI microcomputer and the data is sent to it from a PC via an Ethernet cable. The transmission of the projector device was identified and possible ways of improving the device were suggested. The results of this thesis allow creation of a multi-coloured vector picture, transferring it into the device and depiction on the project desktop. The whole device can therefore be used for example for the purpose of a presentation.

Cited by 0

3D projector

David Adam Jonathan Bell · DR-NTU (Nanyang Technological University) · 2014

This report details the work undertaken by the author towards the “3D Projector” project undertaken as part of the “MP4079 – Final Year Project” class at Nanyang Technological University in Singapore. The work was completed during the period from 12 August 2013 to 7 April 2014. The objectives set out at the beginning of the project were for the student to improve the existing 3D holographic projector at the Centre for Optical and Laser Engineering (COLE) laboratory at NTU, for them to prepare holographs for display, and to prepare an instruction manual. A review of background theory is supplied, along with the steps taken in the design optimisation process. Detailed CAD drawings of all the components in the projector are also provided. In the appendices section of the report, an instruction manual for the projector is also provided. Project objectives were completed ahead of time and to a satisfactory standard in regards to the original scope. The 500 Singapore dollar budget was not exceeded.

Cited by 0