Method and apparatus for providing a seamless tiled display

A display for producing a seamless composite image from at least two discrete images. The display includes one or more projectors for projecting each of the discrete images separately onto a screen such that at least one of the discrete images overlaps at least one other of the discrete images by more than 25 percent. The amount of overlap that is required to reduce the seams of the composite image to an acceptable level over a predetermined viewing angle depends on a number of factors including the field-of-view and aperture size of the projectors, the screen gain profile, etc. For rear-projection screens and some front projection screens, an overlap of more than 25 percent is acceptable

Display screen and method of manufacture therefor

A screen assembly that combines an angle re-distributing prescreen with a conventional diffusion screen is disclosed. The prescreen minimizes or eliminates the sensitivity of the screen assembly to projector location. The diffusion screen provides other desirable screen characteristics. The prescreen is preferably formed by a collection of light transmitting and refracting elements, preferably spheres 80, partially embedded in a light blocking layer. Toward the back of the spheres 80 are effective apertures 82 where the light blocking layer 81 is absent or at least thinner than in other regions toward the side of the spheres. The projected image enters spheres 80 through the effective apertures 82, and exits the spheres 80 centered orientationally about the normal to the lens axis. The re-oriented light rays then enter the diffusion screen for viewing

Testing Minority Preferences in Broadcasting

The United States government has several policies and programs designed to increase the number of broadcasting stations owned by racial minorities. Increasing the number of minority-owned broadcasting stations, the government claims, will diversify the content of broadcast programs by increasing the amount of minority-oriented programming. Minority owners will program their stations differently than white owners, the government claims. In this paper we present the first econometric test of these propositions about minority ownership of broadcasting stations as well as a number of other related propositions. We conclude that increasing the number of minority-owned broadcasting stations increases the amount of minority-oriented programming. We also conclude that increasing the number of female-owned stations-a policy that has been ruled unconstitutional would be just as effective at increasing minority-oriented programming

Seamless tiled display system

A modular and scalable seamless tiled display apparatus includes multiple display devices, a screen, and multiple lens assemblies. Each display device is subdivided into multiple sections, and each section is configured to display a sectional image. One of the lens assemblies is optically coupled to each of the sections of each of the display devices to project the sectional image displayed on that section onto the screen. The multiple lens assemblies are configured to merge the projected sectional images to form a single tiled image. The projected sectional images may be merged on the screen by magnifying and shifting the images in an appropriate manner. The magnification and shifting of these images eliminates any visual effect on the tiled display that may result from dead-band regions defined between each pair of adjacent sections on each display device, and due to gaps between multiple display devices

Alignment of a three-mirror telescope using the sine condition test

The Sine Condition Test has been experimentally demonstrated as an effective tool for measuring linearly field dependent aberrations in simple optical systems. Simulations have also shown that it can be used to provide feedback as part of an alignment procedure for more complex systems. In this paper we show how the Sine Condition Test was used as part of the process for aligning a three mirror telescope. We present the basic concept of the Sine Condition Test, how it was implemented in our system and the experimental results from multiple alignments. Finally, we compare our experimental results to simulated results.This 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]

Testing Minority Preferences in Broadcasting

The United States government has several policies and programs designed to increase the number of broadcasting stations owned by racial minorities. Increasing the number of minority-owned broadcasting stations, the government claims, will diversify the content of broadcast programs by increasing the amount of minority-oriented programming. Minority owners will program their stations differently than white owners, the government claims. In this paper we present the first econometric test of these propositions about minority ownership of broadcasting stations as well as a number of other related propositions. We conclude that increasing the number of minority-owned broadcasting stations increases the amount of minority-oriented programming. We also conclude that increasing the number of female-owned stations-a policy that has been ruled unconstitutional would be just as effective at increasing minority-oriented programming

161. The Potential Role of Extensor Muscle Fatigue in the Onset of Intervertebral Disc Degeneration: A Novel In Vivo Model

BACKGROUND CONTEXT: Occupation is strongly correlated to low back pain (LBP). Specific occupational activities associated with low back pain include poor posture, whole body vibration, and repetitive lifting. These activities have a common link: they result in fatigue of the primary spinal extensor musculature. This fatigue may lead to increased intervertebral loading - a stimulus for disc degeneration. If true, this association could provide a vital connection between detrimental physical activities and LBP. However, the link between muscle fatigue and increased load across the disc space has never been quantified in vivo. PURPOSE: The purpose of this study was to develop and test a wireless multi-axial force-sensing implant and large animal model of primary extensor muscle fatigue. Combined, these tools allow measurement of in vivo spinal forces during muscle fatigue to quantify changes in spine loading