The Experts below are selected from a list of 42699 Experts worldwide ranked by ideXlab platform

Michael W. Marcellin - One of the best experts on this subject based on the ideXlab platform.

  • ICIP - Visually lossless JPEG2000 at fractional Resolutions
    2011 18th IEEE International Conference on Image Processing, 2011
    Co-Authors: Ali Bilgin, Michael W. Marcellin
    Abstract:

    JPEG2000 images with K wavelet decomposition levels inherently support K + 1 spatial Resolutions. Other Resolutions can be obtained through resampling adjacent native Resolution images. In this paper, we propose a method of encoding images that can be decoded at arbitrary Resolutions in a visually lossless manner with minimum bitrates. To achieve this, visibility thresholds for resampled quantization distortions are studied, and a technique of applying thresholds that vary with the Display Resolution is introduced.

  • ICIP - Multi-Resolution visually lossless image coding using JPEG2000
    2010 IEEE International Conference on Image Processing, 2010
    Co-Authors: Han Oh, Ali Bilgin, Michael W. Marcellin
    Abstract:

    The visibility threshold is the maximum contrast where a stimulus remains invisible. This value varies with the spatial frequency and orientation of the stimulus and is often used in determining the quantization step size of a subband for visually lossless coding. When an image is Displayed at a different Resolution level, the spatial frequency of each subband is also changed. Previous JPEG2000 visually lossless algorithms have a single set of quantization step sizes optimized for the full Display Resolution. This implies that if the image is rendered at reduced Resolution there are significant amounts of extraneous information in the codestream. In this paper we present a new coding method which effectively incorporates multiple quantization step sizes into the JPEG2000 framework. This allows for visually lossless decoding at a variety of Resolutions, using only a portion of the full Resolution codestream.

Akira Okada - One of the best experts on this subject based on the ideXlab platform.

  • HCI (26) - Influence of Display Resolution on Brain Activity and Task Workload
    HCI International 2016 – Posters' Extended Abstracts, 2016
    Co-Authors: Kiyomi Sakamoto, Kuniko Yamashita, Yutaka Tanaka, Akira Okada
    Abstract:

    We experimentally investigated the influence of the use of a high-Resolution 4K tablet on participants’ physiological and psychological state while engaged in searching tasks, to evaluate their associated mental and physical workloads. The results showed NIRS, an index of nervous system activity, to be significantly higher during searching tasks with 4K content than with 2K content, whereas LF/HF (level of sympathetic nerve activity) during searching tasks was significantly lower for 4K content than for 2K content, although no significant differences were observed in subjective assessments between 4K and 2K Displays.

  • Effect of Display Resolution on brain activity and physical and mental stress when using a tablet
    2016 IEEE International Symposium on Consumer Electronics (ISCE), 2016
    Co-Authors: Kiyomi Sakamoto, Kuniko Yamashita, Yutaka Tanaka, Akira Okada
    Abstract:

    We experimentally investigated the effect of the use of a high-Resolution 4K tablet on brain activity and physical and mental stress while engaged in searching tasks. The results showed NIRS, an index of nervous system activity, to be significantly higher during searching tasks with 4K content than with 2K content, whereas LF/HF (level of sympathetic nerve activity) and blinking rates during the first half of the rest time after a set of tasks showed a tendency to be lower for 4K content than for 2K content. Moreover, the score for “visual fatigue” in subjective assessments tended to be lower for 4K content than for 2K content. Our results suggest that searching tasks in 4K can cause a surge in brain activity but a lower task workload, such as physical and mental stress and visual fatigue.

  • ISCE - Influence of Display Resolution on psychophysiological state while viewing content: A comparison between age groups
    2015 International Symposium on Consumer Electronics (ISCE), 2015
    Co-Authors: Kiyomi Sakamoto, Seiji Sakashita, Hiroaki Shimazaki, Masahiro Kawashima, Kuniko Yamashita, Akira Okada
    Abstract:

    In this study, we carried out experiments to investigate the influence of Display Resolution on psychophysiological state while viewing various types of video content at 4K and 2K on a 65-inch 4K TV as a comparison between age groups. The participants viewed four kinds of TV video content (two types of scenic material and two kinds of material with movement and action). The results showed the psychological evaluation scores for participants in their 20s to be higher than those in their 50s when viewing 4K scenic content. However in both age groups, NIRS, an index of nervous system activity, during viewing tests of 4K scenic content, was significantly higher for 4K scenic content viewing than for 2K scenic content. On the other hand, there was a significant difference observed between NIRS for 4K and for 2K in the 50s participants, although there was no significant difference observed for NIRS between Resolutions in the 20s participants. Our results suggest that content viewing at 4K can cause psychological elation and a surge in brain activity, although the effects varied somewhat according to content.

  • ICCE-Berlin - Effect of Display Resolution on physiological and psychological state while viewing video content
    2014 IEEE Fourth International Conference on Consumer Electronics Berlin (ICCE-Berlin), 2014
    Co-Authors: Kiyomi Sakamoto, Seiji Sakashita, Hiroaki Shimazaki, Masahiro Kawashima, Kuniko Yamashita, Akira Okada
    Abstract:

    We experimentally evaluated the effect of Display Resolution on physiological and psychological state while viewing video content at 4K and 2K on a 65-inch 4K TV. Four kinds of video content (two types of scenic material and two types of material with movement and action) were used. Each program comprised two minutes of 4K and two minutes of 2K content. The results showed that the scores for “presence,” “impact,” “realism,” “quality” and “precision” when viewing 4K scenic content were significantly higher than those for 2K content. Significant differences were also observed between NIRS, an index of nervous system activity, during viewing tests of 4K content and that for 2K content; and between heart rate, an index of sympathetic nervous system activity, during viewing tests of 4K content and that for 2K content. Our results suggest that viewing material at 4K causes psychological elation, a surge in brain activity and calming of autonomic nerve activity, although the effects varied with type of content.

Thomas Schnell - One of the best experts on this subject based on the ideXlab platform.

  • Trade-offs in synthetic vision system Display Resolution, field of regard, terrain data density, texture, and shading during off-path operations
    International Journal of Aviation Psychology, 2009
    Co-Authors: Thomas Schnell, Mike Keller, Timothy Etherington
    Abstract:

    We conducted 2 independent fixed-base flight simulator studies to determine trade- offs in synthetic vision system (SVS) Display Resolution, field of regard, terrain data density, texture, and shading during off-path operations. The data we present herein are a synthesis of prior work and may be useful for consideration by SVS designers and certification entities. Pilots flew off-path tasks, following the middle of a curved valley depicted on the SVS. The SVS parameters were manipulated between runs and cross-track deviations from the desired path following the middle of the valley were recorded. Off-path terrain navigation tasks were used to isolate the effect of the different SVS terrain depictions on cross-track error without the overriding effects of other flight guidance symbology. For off-path SVS operations and based on the re- sults presented in this article, we recommend an SVS head-down Display Resolution of about 105 pixels per inch (ppi; 32.7 pixels per degree of visual angle) or better at a viewing distance of 21 in., a field of regard of 60 degrees, a terrain data density of 6 arc sec or better, a two-color checkerboard or elevation-based coloring scheme (or a combination thereof), and Gouraud shading of the texture.

  • Pilot performance as a function of Display Resolution and field of view in a simulated terrain following flight task using a synthetic vision system
    22nd Digital Avionics Systems Conference Proceedings (Cat No 03CH37449) DASC-03, 2003
    Co-Authors: M. Keller, Thomas Schnell, K. Lemos, L. Glaab, R. Parrish
    Abstract:

    The implementation of Synthetic Vision Systems (SVS) has posed a number of design questions. One of these questions is centered on the minimum required Display Resolution of the synthetic vision Display. Although a very high Resolution Display may be desirable from a product appeal point of view or for increased image fidelity, high quality Displays may be prohibitively expensive, particularly for general aviation pilots. Also, there may be a marginal rate of return in terms of pilot performance, workload and situation awareness (SA). A second important issue is the field of view used in Displaying the synthetic terrain. Smaller fields of view are more conformal with the natural view but appear to offer a smaller amount of navigationally relevant information than do wider fields of view. A large field of view offers the pilot more information, but distorts the image similar to what happens when wide angle lenses are used on cameras. Further, the optimal field of view may differ based on the phase of flight. The Operator Performance Laboratory (OPL) at the University of Iowa conducted an experiment to assess human performance as a function of Display Resolution and field of view. Licensed instrument pilots flew sixteen approaches in the OPL General Aviation Workstation II (GAWS TOO) flight simulator with varying Display options to determine the effect of the Displays on flight technical performance. Performance was measured for four Display Resolutions, ranging from 120 pixels per inch (best) to 80 pixels per inch (worst). Field of view ranged from 22d (conformal) to 90d (greatest minification). Flight technical performance of the pilots was measured using four objective measures: cross track error, lateral track error, runway alignment deviation, and control input. The first three measures provide a re

Tao Zhan - One of the best experts on this subject based on the ideXlab platform.

  • Improving near-eye Display Resolution by polarization multiplexing.
    Optics Express, 2019
    Co-Authors: Tao Zhan, Jianghao Xiong, Guanjun Tan, Yun-han Lee, Jilin Yang, Sheng Liu
    Abstract:

    We present here an optical approach to boost the apparent pixel density by utilizing the superimposition of two shifted-pixel grids generated by a Pancharatnam-Berry deflector (PBD). The content of the two shifted pixel grids are presented to the observer’s eye simultaneously using a polarization-multiplexing method. Considering the compact and lightweight nature of PBD, this approach has potential applications in near-eye Display systems. Moreover, the same concept can be extended to projection Displays with proper modifications.

  • enhancing the Resolution of a near eye Display with a pancharatnam berry phase deflector
    Optics Letters, 2017
    Co-Authors: Yun-han Lee, Tao Zhan
    Abstract:

    We report an electro-optic image shifter to enhance the Resolution of Display devices with a Pancharatnam–Berry phase deflector (PBD). The switching time of our PBD is less than 1 ms. Through synchronizing and computational factorization, we are able to double the Display Resolution for reducing the screen door effect. Such a thin and lightweight PBD image shifter can be easily integrated into wearable Display devices. Its potential application for virtual reality and augmented reality is emphasized.

S Daly - One of the best experts on this subject based on the ideXlab platform.

  • improved Display Resolution of subsampled colour images using subpixel addressing
    International Conference on Image Processing, 2002
    Co-Authors: D S Messing, S Daly
    Abstract:

    Subsampling based on subpixel addressing has been successfully applied to the problem of font rendering on an LCD. The increased horizontal Resolution of the process makes otherwise fuzzy or aliased text look noticeably clearer, but the increased luminance Resolution comes at the cost of chrominance aliasing. Also, the technique has only been applied to achromatic imagery. A new algorithm is presented which, based on a human perceptual model, successfully removes visible chrominance aliasing while retaining the invisible aliased components that contribute to enhanced Resolution. The algorithm is applicable to both achromatic and natural colour imagery.

  • ICIP (1) - Improved Display Resolution of subsampled colour images using subpixel addressing
    Proceedings. International Conference on Image Processing, 1
    Co-Authors: D S Messing, S Daly
    Abstract:

    Subsampling based on subpixel addressing has been successfully applied to the problem of font rendering on an LCD. The increased horizontal Resolution of the process makes otherwise fuzzy or aliased text look noticeably clearer, but the increased luminance Resolution comes at the cost of chrominance aliasing. Also, the technique has only been applied to achromatic imagery. A new algorithm is presented which, based on a human perceptual model, successfully removes visible chrominance aliasing while retaining the invisible aliased components that contribute to enhanced Resolution. The algorithm is applicable to both achromatic and natural colour imagery.