著者

Takefumi Hiraki Shogo Fukushima Hiroshi Watase Takeshi Naemura

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.7, no.4, pp.160-168, 2019 (Released:2019-10-01)

参考文献数

18

被引用文献数

5

---

We previously studied methods leveraging pixel-level visible light communication (PVLC) that embeds imperceptible information for human eyes in each pixel of an image. The PC computation load and amount of data transferred between the PC and projector in previous PVLC systems were excessive because the PC executed both the video and data encoding processes. As a result, it was impossible to achieve both high-dynamic-range images and dynamic updates of the images and data. In this paper, we propose a dynamic PVLC system that offers high video quality and interactively updates the PVLC information through hardware encoding processing. Our system can project a 24-bit gradation color PVLC video that contains 64-bit data at 120 fps by synchronously controlling the ON/OFF states of the DMD and LED light sources at the given performance limit of the projector.

著者

Satoshi Abe Takefumi Hiraki Shogo Fukushima Takeshi Naemura

出版者

The Institute of Image Information and Television Engineers

雑誌

ITE Transactions on Media Technology and Applications (ISSN:21867364)

巻号頁・発行日

vol.8, no.3, pp.170-185, 2020 (Released:2020-07-01)

参考文献数

40

被引用文献数

2

---

Communication between screens and cameras has attracted attention as a ubiquitous information source, motivated by the widespread use of smartphones and the increase of public information screens. The method that encodes data into visible patterns impairs the user's visual experience. Previously, embedding matrix barcodes into images on displays by utilizing imperceptible color vibration was proposed. In this approach, the visual experience is maintained considering that barcodes are imperceptible, and it can be implemented on almost any display and camera. Herein, we describe a sophisticated modulation protocol and restoration procedure whereby device characteristics such as the display's gamma feature and the smartphone's rolling shutter are taken into consideration. Extensive experiments reveal the parameters for the modulation and that this system works under practical situations. In addition, scenarios of potential practical applications and a user study examining imperceptibility of barcodes and usability of the system are presented to illustrate the technological capabilities.