PVLC projector

Kimura, Sho; Oguchi, Riichi; Tanida, Hideo; Kakehi, Yasuaki; Takahashi, Keita; Naemura, Takeshi

doi:10.1145/1400885.1401030

Cited by 16 publications

References 1 publication

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Visuo-Haptic Display by Embedding Imperceptible Spatial Haptic Information into Projected Images

Miyatake

Hiraki

Maeda

et al. 2020

Haptics: Science, Technology, Applications

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Visuo-haptic augmented reality (AR) systems that represent visual and haptic sensations in a spatially and temporally consistent manner are used to improve the reality in AR applications. However, existing visual displays either cover the user's field-of-view or are limited to flat panels. In the present paper, we propose a novel projectionbased AR system that can present consistent visuo-haptic sensations on a non-planar physical surface without inserting any visual display devices between a user and the surface. The core technical contribution is controlling wearable haptic displays using a pixel-level visible light communication projector. The projection system can embed spatial haptic information into each pixel, and the haptic displays vibrate according to the detected pixel information. We confirm that the proposed system can display visuo-haptic information with pixel-precise alignment with a delay of 85 ms. We can also employ the proposed system as a novel experimental platform to clarify the spatio-temporal perceptual characteristics of visual and haptic sensations. As a result of the conducted user studies, we revealed that the noticeable thresholds of visual-haptic asynchrony were about 100 ms (temporal) and 10 mm (spatial), respectively.

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Visuo-Haptic Display by Embedding Imperceptible Spatial Haptic Information into Projected Images

Miyatake

Hiraki

Maeda

et al. 2020

Haptics: Science, Technology, Applications

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PILC Projector: Image Projection With Pixel-Level Infrared Light Communication

et al. 2019

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Invisible-light communication between a projector and multiple devices on the projection plane enables human-computer interaction applications such as movable displays and pointing devices. In this paper, we propose a pixel-level infrared light communication (PILC) projector that can project rich, invisible position-dependent information on high-contrast, full-color visible images. Although previous methods for such communication sacrificed the image quality, the amount of information, or other features, our method meets all the requirements by adding an infrared light source to a full-color DLP projector. This system alternately projects visible images and invisible data sequences with visible and infrared light, respectively. As proof of concept, we built a functional prototype and confirmed that its image contrast is more than 60 times that of a previous method while maintaining pixel-level position accuracy. In addition, we investigated flicker-perception rates in response to different amounts of embedded information and discovered that we could send rich information (up to approximately 2 kbps) with imperceptible flicker. Finally, we built a tabletop application with the proposed system, in which users can simultaneously see both an aerial photograph and a map through movable displays.

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