The "Japan Visible Light Communication International Conference and Exhibition 2015", which showcases the latest technology of visible light communication, was held on October 26th at the Keiji Campus of Keio University in Japan. This is the first international conference and exhibition on the theme of visible light communication. The exhibition mainly introduces the progress of technology development in (1) digital signage (electronic signage) using a smartphone camera as a receiver, and (2) the use of a drone using a high-performance camera.
Visible light communication has received much attention 10 years ago, but no application examples have appeared. However, Nakagawa Masao, a member of the Japan Visible Light Communication Association and an honorary professor at Keio University in Japan, said, "In the past two years, visible light communication has once again received attention, and some practical examples have begun to appear." The popularity of smartphones equipped with the three elements of "camera", "application software" and "wireless communication" is the primary reason. In fact, there are several practical examples of (1) digital signage use.
At the exhibition, the "Optical ID Service Solution" developed by Matsushita, which was decided to be introduced in the spring of 2016 in Tokyo, and the practical level (starting verification test in 2015) developed by Fujitsu are displayed. LED lighting technology, etc. Since visible light communication can send IDs and URLs, by aligning the smartphone's camera with various advertisements (posters), AR (Augmented Reality) technology can be used to provide multilingual information, and visible light communication can also be used for text information. Accessibility display that switches between voice messages and the like. Therefore, for the 2020 Tokyo Olympics, the demand for visible light communication is expected to expand.
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Panasonic's "Light ID Service Solution." It is possible to read 32-bit or 120-bit data at intervals of a few tenths of a second according to the 10 kHz flicker. The characteristic of reading an image through a horizontal line by a smartphone camera (photosensitive element) is utilized, and the flicker of the light source is read by reading the brightness and darkness exhibited by the time difference in one image. Commercially available HD-grade photosensitive elements can be used.
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Fujitsu's "LED lighting technology for connecting physical objects and information" is a technology for reading ID information by taking a physical object that is illuminated. The illuminated light (the light source is located in the lower right corner of the figure) is assigned binary information in the temporal color change pattern. This technology is characterized by strong noise immunity and is not easily recognized by the naked eye even at low frequencies of less than 10 Hz. This technology has been used in the "Japanet Takata" online shopping channel for practical use of TV images for LED lighting applications. This technology requires a lighting device that can change color in RGB full color, and the goal is to practicalize the stage lighting and building lighting that already have the above lighting device.
Can be used to monitor the status of the plant
Nakagawa pointed out that "by using an ordinary camera as a receiver, it is possible to obtain other information such as position information and individual identification in a certain space at the same time, which is one of the reasons why visible light communication has attracted much attention." If a fixed camera such as a surveillance camera is used, the position of the object can be confirmed by the image itself, and the information of the object can be confirmed by visible light communication. "Even if the moving object and the two objects that often move together are overlapped, they can be recognized without being disturbed like electric waves." In the conference section, the NTT Communication Science Foundation introduced methods for managing user heart rate using visible light communication in stadiums and nurseries. The user carries an LED light source, sends heart rate information, and confirms with a fixed camera. Users do not have to specify their location in detail, and the monitoring party can grasp the position and heart rate of each user at one time.
For example, Nakagawa said, "Visible light communication can also be used for licenses for unmanned aerial vehicles. It is only necessary to install LEDs on the aircraft, and the monitoring party manages while monitoring the shadows." The topic of this type of application is how to keep up with the speed of the moving light source (sender). At the exhibition, NEC Engineering demonstrated a "visible light communication high-speed receiving camera" that monitors four light sources with a moving speed of about 50 cm/sec. The company is equipped with hardware that performs parallel processing at 750 bps on a 640-pixel x 100-pixel, 1500-frame/second camera, displaying ID and real-time incidental information almost without interruption. Casio Computer used the company's three-color visible light communication technology "picalico" for drone monitoring demonstrations. The demo uses a 60-frame/second camera and computer, and when the aircraft suddenly moves, the ID display is interrupted. In addition, the Casio computer also demonstrated the use of visible light communication technology in the manufacturing device status "indicator", specifically, even if the network is not laid, as long as the usual indicator light is replaced with an indicator light that supports visible light communication, the camera can be utilized. To get information including the error ID, you can monitor the status in the factory.
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"High-speed receiving camera for visible light communication" (top left) of NEC Engineering. In the demonstration, the information of the four light sources (upper right) on the top of the metronome and the turntable is read (below). Up to 1000 sources of data can be read.
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Casio computers use the visible light communication technology "picalico" to demonstrate drone monitoring. Received the IDs of the two aircraft. If it is a static point, it can support up to 50 points.
With the ability to grasp position and status, the “picalico†technology can be used to manage equipment in the factory. You can grasp the situation through the screen and record the status of each machine at regular intervals. There is no need to lay a LAN, so it is very useful in places where you need to change the layout frequently. Various monitoring ranges can be supported by changing the performance of the camera, including resolution, telephoto, wide angle, and the like.
According to Nakagawa, "In the past, there have been a lot of research on high-performance cameras with high frame rates in the field of visible light communication. Recent research has focused on how much information can be sent by ordinary cameras such as 30 frames/second (equipped with a smartphone). On the amount." The extent to which research on the integration of unrelated communication engineering and image engineering can be developed is an important factor for the future development of visible light communication. (Editor: Flora)
In addition, as a possibility of visible light communication, others have proposed a scheme for using it as a teaching material. Koji Yumi, Associate Professor of Design Department, Okayama Prefectural University, Japan, designed the "Glowing Thermometer Design" kit that displays temperature without the temperature display function and displays the temperature on the smartphone through the flashing visible light communication, and has it at the National Yunlin University of Science and Technology in Taiwan. Used in the handouts of product design. The kit on the right is a combination of the thermometer, the "picalico" of the Casio computer and the battery on the "Gadget Renesas GR-KURUMI" board. On the left is one of the works "My Heart 28 °C". A thermometer that looks like a wedding ring takes advantage of the constant flickering of light in visible light communication. According to the introduction of the child jade, it is characterized by the use of visible light communication as "visible" communication. Students can feel the existence of communication.
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