Beaming Displays

Existing near-eye display designs struggle to balance between multiple trade-offs such as form factor, weight, computational requirements, and battery life. These design trade-offs are major obstacles on the path towards an all-day usable near-eye display. In this work, we address these trade-offs by, paradoxically, removing the display from near-eye displays. We present the beaming displays, a new type of near-eye display system that uses a projector and an all passive wearable headset. We modify an off-the-shelf projector with additional lenses. We install such a projector to the environment to beam images from a distance to a passive wearable headset. The beaming projection system tracks the current position of a wearable headset to project distortion-free images with correct perspectives. In our system, a wearable headset guides the beamed images to a user’s retina, which are then perceived as an augmented scene within a user’s field of view. In addition to providing the system design of the beaming display, we provide a physical prototype and show that the beaming display can provide resolutions as high as consumer-level near-eye displays. We also discuss the different aspects of the design space for our proposal

Metameric Inpainting for Image Warping

Image-warping , a per-pixel deformation of one image into another, is an essential component in immersive visual experiences such as virtual reality or augmented reality. The primary issue with image warping is disocclusions, where occluded (and hence unknown) parts of the input image would be required to compose the output image. We introduce a new image warping method, Metameric image inpainting - an approach for hole-filling in real-time with foundations in human visual perception. Our method estimates image feature statistics of disoccluded regions from their neighbours. These statistics are inpainted and used to synthesise visuals in real-time that are less noticeable to study participants, particularly in peripheral vision. Our method offers speed improvements over the standard structured image inpainting methods while improving realism over colour-based inpainting such as push-pull. Hence, our work paves the way towards future applications such as depth image-based rendering, 6-DoF 360 rendering, and remote render-streaming

Perceptually guided computer-generated holography

Computer-Generated Holography (CGH) promises to deliver genuine, high-quality visuals at any depth. We argue that combining CGH and perceptually guided graphics can soon lead to practical holographic display systems that deliver perceptually realistic images. We propose a new CGH method called metameric varifocal holograms. Our CGH method generates images only at a user’s focus plane while displayed images are statistically correct and indistinguishable from actual targets across peripheral vision (metamers). Thus, a user observing our holograms is set to perceive a high quality visual at their gaze location. At the same time, the integrity of the image follows a statistically correct trend in the remaining peripheral parts. We demonstrate our differentiable CGH optimization pipeline on modern GPUs, and we support our findings with a display prototype. Our method will pave the way towards realistic visuals free from classical CGH problems, such as speckle noise or poor visual quality

Vaccination coverage and reasons for non-vaccination in a district of Istanbul

BACKGROUND: In order to control and eliminate the vaccine preventable diseases it is important to know the vaccination coverage and reasons for non-vaccination. The primary objective of this study was to determine the complete vaccination rate; the reasons for non-vaccination and the predictors that influence vaccination of children. The other objective was to determine coverage of measles vaccination of the Measles Immunization Days (MID) 2005 for children aged 9 month to 6 years in a region of Umraniye, Istanbul, Turkey. METHODS: A '30 × 7' cluster sampling design was used as the sampling method. Thirty streets were selected at random from study area. Survey data were collected by a questionnaire which was applied face to face to parents of 221 children. A Chi-square test and logistic regression was used for the statistical analyses. Content analysis method was used to evaluate the open-ended questions. RESULTS: The complete vaccination rate for study population was 84.5% and 3.2% of all children were totally non-vaccinated. The siblings of non-vaccinated children were also non-vaccinated. Reasons for non-vaccination were as follows: being in the village and couldn't reach to health care services; having no knowledge about vaccination; the father of child didn't allow vaccination; intercurrent illness of child during vaccination time; missed opportunities like not to shave off a vial for only one child. In logistic regression analysis, paternal and maternal levels of education and immigration time of both parents to Istanbul were found to influence whether children were completely vaccinated or non-vaccinated. Measles vaccination coverage during MID was 79.3%. CONCLUSION: Efforts to increase vaccination coverage should take reasons for non-vaccination into account

Income Distribution and Economic Crises

This paper analyzes the relationship between income distribution and the severity of economic crises, where the severity is measured by the length and the depth of the recessions. Using an extensive panel dataset on income distribution and employing an event study framework, we find significant evidence that there is a negative association between the prevailing degree of income inequality and the severity of the recessions. In the case of high income countries that have bad income distribution, however, recessions are observed to be longer than the average. This observation is likely to result from the combination of the strong status-quo bias of the financially powerful income groups and the available means to redistribute towards the poor so as to help mitigate the pressures for reforms to improve income distribution via creative destruction. The longer period of recessions observed in developed countries than in less developed countries in the aftermath of the Great Recession is in support of this argument. The findings also reveal that recessions tend to be longer during the decade of the 1990s than the rest of the period studied. The evidence regarding the corrective effect on the recessions of accommodative fiscal or monetary policy stance, measured by the size of the government and the inflation rate, is observed to be only barely significant on average. Wirh regard to the impact of recessions on income distribution, the evidence in the paper indicates that the post-crises income distribution worsens significantly with the length but improves with the depth of the preceding recession. We also note that, in addition to the persistence effect, the lack of monetary discipline worsens income distribution in the postcrises period significantly

Opinions of Secondary School Students about Socio-cultural Change and Education in Turkey: Findings from a Survey in May-June 2011

AbstractA questionnaire consisting of 89 questions was administered to 2584 students in 38 high schools from five different types of high schools in ten districts/municipalities on the Asian side of Istanbul. These five types of schools were cross-tabulated with parents’ educational background and occupational statuses: Anatolian High School and Private High Schools students’ fathers and mothers had been mostly professionals and high level administrators from upper-middle strata, while Vocational High Schools, semi-religious Imam-Hatip High Schools and General High School students’ fathers and mothers were mostly craftsmen, small traders and workers from lower social strata. Students’ knowledge of what is happening globally is fed by TV and Internet while social media was also one of the vehicles through which they get connected with each other and with the world. Students’ experience of going abroad was rather low while the percentage of wanting to live abroad was rather high. Students’ attitudes towards mathematics were not very positive

Beaming Display Using Thin Holographic Waveguides for Wider Head Orientation Angle Range

Augmented Reality (AR) glasses face fundamental challenges related to technical trade-offs. Emerging Beaming Displays (BDs) offer a compelling solution by separating the active and passive components. However, existing BD-based AR glasses have yet to achieve a thin and lightweight design with wide incident projection angles. This work proposes an eyepiece for BDs, including a holographic waveguide with tailored in- and out-coupling gratings. The proposed design aims to achieve a millimeter-thin form factor with a wide tolerance for incident angles, thus overcoming the limitations of existing designs. We have constructed proof-of-concept passive AR glasses prototypes, all approximately 2mm thick, including one in the form of conventional eyeglasses, and demonstrated an acceptable lateral angle of incidence of up to 90 degrees