Light field visualization technology offers a glasses-free 3D experience that may be enjoyed by multiple observers simultaneously. The overall visual experience depends on a multitude of factors, among which is light ray density. In case of horizontal-only parallax displays, it defines the smoothness of the horizontal motion parallax, which is crucial to visualization quality. However, the perceived light ray density naturally depends on the viewing distance; the farther the observer is, the fewer light rays may address the two pupils, with respect to a single point on the screen. Research on this topic has already been initiated and the first results are now available in the scientific literature. However, the experiment, similarly to the vast majority of research efforts regarding the perceived quality of light field visualization, is built on the participation of individuals that are screened for normal vision. Yet a notable portion of potential future users would not pass such screening, particularly the Snellen chart on visual acuity. In this paper, we investigate the suitability of viewing distances for the future use cases of light field visualization from the perspective of users with reduced visual capabilities. The subjective tests evaluate contexts of passive visual consumption, such as a cinematic experience or an exhibition of cultural heritage. The selected use cases are not only assessed by their natural viewing distance intervals, but by closer and farther distances as well. The output of the research aims to extend the social inclusion of potential systems and services of light field visualization.
Smart wearable devices have taken the market by storm. They are now their own device category on the consumer market, their popularity is unquestioned due to their ever-increasing set of functionalities and the vigorous competition between some of the biggest companies, and they seamlessly integrated into our everyday lives, as well as into professional contexts. New models appear on the market regularly, particularly since the sensory system of such devices is continuously developing, adding more ways of data acquisition and processing, along with projections and analyses. However, while the devices of certain subcategories are nearly identical with regard to their core functionalities, there may be significant differences in their specifications. Furthermore, the delivery of specifications towards the users is highly manufacturer-dependent and lacks coherent standardization. This is particularly relevant to professional contexts, such as defense, where individuals competently familiarizing themselves with their personal devices is essential. In this paper, we investigate the delivery of the specifications of the state-of-the-art smart wearable devices. We separately study the commonalities and best practices by device subcategories and usage contexts. We also highlight certain deviations on the current market and provide recommendations for the further evolution of such practices. The paper introduces the results of a study on documentation-related user behavior as well, in order to support future research.
KEYWORDS: Visualization, Spatial resolution, Molybdenum, Color blindness, Color vision, Prototyping, Analytical research, 3D visualizations, Zoom lenses, Video
Light field visualization technology has progressed significantly in the past two decades. With the emergence of commercially-available devices, both industry and academia have begun research on the potential use cases of future society, including medical visualization, 3D digital signage, telepresence, military applications and many more. During the evaluation and quality assessment of such usage contexts and display types, test participants are typically screened for visual acuity via the Snellen chart and color vision via the Ishihara plates. However, there is an unfortunate global trend that the eyesight of the new generations is getting notably worse, and other sight-related issues, such as color vision deficiency, are becoming more common as well. Therefore, while medical technologies do relentlessly combat the diseases and disorders of the human eye, long-term innovations of visualization must also account for such users. Yet at the time of this paper, those with imperfect vision are underrepresented in light field research. In this paper, we present the results of the series of subjective tests carried out on light field displays, exclusively with test participants that otherwise would not qualify to assess visualization quality in a regular study. The experiments aim at investigating the most relevant research questions of light field visualization quality, such as spatial resolution, angular resolution and viewing distance. Test participants with imperfect visual acuity are classified by the diopters of their corrective lenses, and correlations between diopters and subjective ratings are addressed. Similar analyses were performed for color-blind test participants as well.
Access to the requested content is limited to institutions that have purchased or subscribe to SPIE eBooks.
You are receiving this notice because your organization may not have SPIE eBooks access.*
*Shibboleth/Open Athens users─please
sign in
to access your institution's subscriptions.
To obtain this item, you may purchase the complete book in print or electronic format on
SPIE.org.
INSTITUTIONAL Select your institution to access the SPIE Digital Library.
PERSONAL Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.