&lt;title&gt;Imaging properties of retro-reflective materials used in head-mounted projective displays (HMPDs)&lt;/title&gt;

Hua, Hong; Gao, Chunyu; Rolland, Jannick P.

doi:10.1117/12.478871

Cited by 19 publications

(18 citation statements)

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“…HMPD's and their image qualities as well as the use and evaluation of reflective materials, used as a screen, have been discussed and introduced by others already [12]. This technology was also already used in other research where digital content is projected to reflective surfaces [2] as well as non-reflective surfaces [20,21] to allow interactions between users and the system.…”

Section: State-of-the-artmentioning

confidence: 98%

Head-worn mixed reality projection display application

Akşit

Kade

Özcan

et al. 2014

Proceedings of the 11th Conference on Advances in Computer Entertainment Technology

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The main goal of this research is to develop a mixed reality (MR) application to support motion capture actors. This application allows seeing and exploring a digital environment without occluding the actor's visual field. A prototype is built by combining a retro-reflective screen covering surrounding walls and a headband consisting of a laser scanning projector with a smartphone. Built-in sensors of a smartphone provide navigation capabilities in the digital world. The integrated system has some unique advantages, which are collectively demonstrated for the first time: (i) providing fixed field-ofview (50 o in diagonal), fixed retinal images at full-resolution, and distortion-free images that are independent of the screen distance and shape; (ii) presenting different perspectives to the users as they move around or tilt their heads, (iii) allowing a focus-free and calibration-free display even on non-flat surfaces using laser scanning technology, (iv) enabling multiple users to share the same screen without crosstalk due to the use of retro-reflectors, and (v) producing high brightness pictures with a projector of only 15 lm; due to a high-gain retro-reflective screen. We demonstrated a lightweight, comfortable to wear and low cost head-mounted projection display (HMPD) which acts as a stand-a-lone mobile system. Initial informal functionality tests have been successfully performed. The prototype can also be used as a 3D stereo system using the same hardware by additionally mounting polarized glasses and an active polarization rotator, while maintaining all of the advantages listed above.

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Section: State-of-the-artmentioning

confidence: 98%

Head-worn mixed reality projection display application

Akşit

Kade

Özcan

et al. 2014

Proceedings of the 11th Conference on Advances in Computer Entertainment Technology

View full text Add to dashboard Cite

show abstract

“…HMPD's and their image qualities as well as the use and evaluation of reflective materials, used as a screen, have been discussed and introduced already [13]. This technology was also already used in other research where digital content is projected to reflective surfaces [3] as well as non-reflective surfaces [22,23] to allow interactions between users and the system.…”

Section: State Of the Artmentioning

confidence: 99%

Head-mounted mixed reality projection display for games production and entertainment

Kade

Akşit

Ürey

et al. 2015

Pers Ubiquit Comput

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This research presents a mixed reality (MR) application that is designed to be usable during a motion capture shoot and supports actors with their task to perform. Through our application, we allow seeing and exploring a digital environment without occluding an actor's field of vision. A prototype was built by combining a retroreflective screen covering surrounding walls and a headband consisting of a laser scanning projector with a smartphone. Built-in sensors of a smartphone provide navigation capabilities in the digital world. The presented system was demonstrated in an initially published paper. Here, we extend these research results with our advances and discuss the potential use of our prototype in gaming and entertainment applications. To explore this potential use case, we built a gaming application using our MR prototype and tested it with 45 participants. In these tests, we use head movements as rather unconventional game controls. According to the performed user tests and their feedback, our prototype shows a potential to be used for gaming applications as well. Therefore, our MR prototype could become of special interest because the prototype is lightweight, allows for freedom of movement and is a lowcost, stand-alone mobile system. Moreover, the prototype also allows for 3D vision by mounting additional hardware.

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“…Thirdly, previous investigation on retroreflective materials shows that the retro-reflectance of currently available materials drops off significantly for light incident at angles beyond ±35°. 18 A FOV beyond 70 degrees will inevitably cause vignetting-like effect and compromise image uniformity. Finally, the angular resolution of the display degrades with the increase of the FOV.…”

Section: Overall Specificationmentioning

confidence: 99%

Design of a polarized head-mounted projection display using FLCOS microdisplays

Zhang

Hua

2007

SPIE Proceedings

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Head-mounted projection display (HMPD) technology, as an alternative to conventional head mounted displays (HMD), offers the potential of designing wide field-of-view (FOV) optical see-through HMDs. Due to multiple passes through a beamsplitter, however, existing HMPD designs suffer from low luminance efficiency and thus the displayed image is lack of brightness and contrast. The design of a polarized head-mounted projection display (p-HMPD) was recently proposed. The major departure of a p-HMPD design from other existing HMPD systems is the usage of polarization management to minimize light loss through beamsplitting. A p-HMPD consists of a pair of projections lenses, microdisplays, polarization control elements, and retroreflective sheeting material as a projection screen. In this paper, we explore the usage of a ferroelectric liquid-crystal-on-silicon (FLCOS) microdisplay as the image source and present a compact design of an illumination unit with double telecentric optics to achieve highly bright and uniform illumination on the FLCOS microdisplay. The key contribution of this design lies in the compactness which is a critical factor in HMD systems. The first-order optics and the transformation of polarization in the design will be described in detail. The simulation of the illumination unit will be shown and its luminous efficiency and uniformity will be discussed. Based on this illumination engine, we will further describe the design of a compact projection lens and discuss the overall performance of the optics.

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<title>Imaging properties of retro-reflective materials used in head-mounted projective displays (HMPDs)</title>

Cited by 19 publications

References 0 publications

Head-worn mixed reality projection display application

Head-worn mixed reality projection display application

Head-mounted mixed reality projection display for games production and entertainment

Design of a polarized head-mounted projection display using FLCOS microdisplays

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