Understanding by Capturing

17
Understanding by Capturing
～Simultaneous multi-biosignal sensing by visible light communication～
Abstract
By using LEDs and a high-speed camera, we aim to develop an easily expandable sensor-network
system. This exhibit shows a new portable system that processes most tasks on a small FPGA . Our
network system can gather data in situations where the conventional wireless networks do not work
so well. For instance, it can be used to measure detailed biosignal information of athletes playing at
one location, and this information can be sent over a high-speed network to physical education
instructors at another location, who can then remotely coach the athletes. In addition, our system
can be used in group psychophysical experiments. By enabling such new means of study, our
research will lead to new insights into, for example, how to quantify realistic communications.
Raw images
System Configuration
Serial transmission of
8-bit biosignal
High-speed
camera
Brightness near LEDs
FPGA*
PC
time
Very high throughput is required to
transmit the original images.
（e.g. in 8000 fps case, about 640 Mbps）
Low throughput is all that is
needed to send only averaged
brightness and images.（about 8
Mbps）
Biosignal Sensor
with LED transmitters
LED Tracking Function on FPGA
Simplifying the tracking method
Tracking range
*Field-programmable gate array
Applications
Update the range using center
Center on time i
Rehabilitation
* White pixel corresponding to LED
By taking a brightness
weighted average,
we obtain the center.
Remote coaching system
Related works
[1] 河合遼，城圭太，泉知倫，白木善史，鎌本優，“高速カメラによる広帯域光無線通信のための光源追跡ハードウェアの検討，”情報処理学
会第76回全国大会予稿集，東京電機大学，2014年3月
[2] 中原優，泉知論，白木善史，鎌本優，孟林，“高速カメラによる広帯域光通信の移動体への適用と試作，”2015年電子情報通信学会・総合
大会予稿集，立命館大学，2015年3月
Contact
Yoshifumi Shiraki Moriya Research Laboratory
E-mail : Shiraki.yoshifumi(at)lab.ntt.co.jp
Copyright (C) 2015 NTT Communication Science Laboratories

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