doc.: ieee 802.15-
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doc.: IEEE 802.15-<08-0748 >
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Project: IEEE P802.15 Working Group for Wireless Personal Area NProject: IEEE P802.15 Working Group for Wireless Personal Area Networks (WPANs)etworks (WPANs)Submission Title: [VLC use case with image sensors]Date Submitted: [9 November 2008]Source: [(1)Shuji Suzuki, NEC]Address [(1)1753 Shimonumabe Nakahara-ku Kawasaki 211-8666 Japan]Voice:[(1)81-44-396-2245]E-Mail:[(1) [email protected]]Re: []
Abstract: [VLC use case with image sensors is explained. The hybrid of image sensor and photo diode array is also presented.]
Purpose: [Contribution to IEEE 802.15 SG-VLC]Notice: This document has been prepared to assist the IEEE P802.15. It is offered as a basis for discussion and is not binding on the contributing individual(s) or organization(s). The material in this document is subject to change in form and content after further study. The contributor(s) reserve(s) the right to add, amend or withdraw material contained herein.Release: The contributor acknowledges and accepts that this contribution becomes the property of IEEE and may be made publicly available by P802.15.
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VLC use case with image sensors
Shuji Suzuki
NEC
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Image Sensor Use case
Network
Warehouse
LED Tags
Position
Information APP
Various Mobile Terminals
Size, cost and power consumption reduction
Large Camera
Industrial application
Information collection from Various LEDs
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Image Sensor at high position
LED Tags with optical ID
Location measurement of LED tags with accuracy higher than RFID
Application for Warehouse Management
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Location measurement accuracy
Target LED Tags
VGA Image Sensor
Example: 640 x 480 pixels (VGA) resolution
→ 1.25cm resolution for 8m x6m
Plus Measurement error of distortion by optical lens
8m
6m
Experimental Results
5cm resolution for 8m x 6m plane with
equalization software for lens distortion
Pretty good measurement accuracy
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ＬＥＤ traffic light
ＬＥＤ light ＬＥＤ sign
Emergency information
Sales promotion
ＬＥＤ head light
Bus for Airport
Image sensor in future mobile phone
Received information will be shown on LCD display with Image⇒ AR
AR: Augmented Reality
Bus for Beach
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Optical signal receivers1. Photo diode
Already used for free-space optics receiver (IrDA etc.)
Easy to receive high-speed optical signal
Limited space-division selectivity
→ Weakness for Interference light
2. Image Sensor：
Optical receiver with position detection
Capability of interference rejection
Low dependency for transmission distance
Limited frame-rate → Limited LED signal speed
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Received optical waveform 2.5 Gbps650nm Laser Diode
Example of VL high-seed transmission
Error free for 10cm transmission experiment
Received optical waveform 2.5 Gbps780nm Laser Diode
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Example of High-speed Image Sensor
2400 fps Image Sensor is used to receive 1200bps Optical Signal
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LED Light house: (70% of Japanese Light house)
Weather forecastTidal wave
Sea condition
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Image Sensor
500m Transmission Experiment
５００ｍ
Received Optical Signal Waveform
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Possible Solution: Hybrid of Image sensors and Photo diode array
Is there any solution to take advantage of Image sensors and photo diodes ?
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Hybrid of Image sensors and Photo diode array
Sun light
Multiple optical signal sources
Image Sensor
(640x480)
Optical Lens
Position detection with high quality
image
High-speed Optical signal receiving
Photo diode array (8x6)
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Image Sensor
(640x480)
Optical Lens
Position detection Logic
High-speed receiver circuit array
Photo diode array (8x6)
Signal Selector
Position equalization
Possible structure of Hybrid sensors
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Q&A