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1 Project: IEEE P Working Group for Wireless Personal Area Networks N (WPANs) Submission Title: [VLC using Image Sensor] Date Submitted: [8 September 2008] Source: [(1)Shuji Suzuki, NEC] Address [(1)1753 Shimonumabe Nakahara-ku Kawasaki Japan] Voice:[(1) ] [(1) s-suzuki@dl.jp.nec.com] Re: [] Abstract: [Advantage of image sensor for optical signal and position detector is explained. The example of high-speed image sensor also are presented.] Purpose: [Contribution to IEEE SG-VLC] Notice: This document has been prepared to assist the IEEE P 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 P

2 VLC using Image Sensors Shuji Suzuki NEC 1

3 Contents Optical signal detection by Image sensor Advantage of Image sensor Road map of Image sensor for VL Application for warehouse management Future applicaion of Image sensor Example of high-speed Image sensor develop ment 2 SG-VLC

4 1. Photo diode SG-VLC Optical signal receivers 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:New Technology Optical receiver with position detection Capability of interference rejection Low dependency for transmission distance Future possibility for high-speed transmission 3

5 Optical signal detection by Image Sensor (Video Camera) Optical signal of LED Tags LED Tag Sampling by Image sensor t Optical signal bitrate:40bit/sec Image sensor : 120fps(frame per second) Signal processing by PC or within Image sensor 4

6 Advantage of Image Sensor as an Optical signal detector Sun light Multiple optical signal sources 2 dimensional CMOS/CCD Sensor Capability of Space-Division Multiplexed data transmission and position detection Optical Lens Capability of interference rejection 5

7 Another Advantage of Image Sensor as an Optical signal detector Photons per Pixel Low dependency for transmission distance Multiple pixels are receiving same optical signal Single pixel is receiving optical signal SG-VLC Transmission Distance 6

8 Another Advantage of Image Sensor as an Optical signal detector LED Optical Lens CMOS/CCD Sensor 4pixels 10,000 photons/pixel 40,000 photons 10,000 photons Same photons/pixel 1 pixel 10,000 photons/pixel 7

9 Road map of Image Sensor Network Large Camera Position Information APP LED Tags Industrial application Warehouse SG-VLC Various Mobile Terminals Information collection from Various LEDs 8

10 Application for Warehouse Management Image Sensor at high position LED Tags with optical ID Location measurement of LED tags with accuracy higher than RFID 9

11 VGA Image Sensor Location measurement accuracy Example: 640 x 480 pixels (VGA) resolution 1.25cm resolution for 8m x6m Plus Measurement error of distortion by optical lens Experimental Results Target LED Tags 5cm resolution for 8m x 6m plane with equalization software for lens distortion 6m Pretty good measurement accuracy 8m 10

12 Road map of Image Sensor Network Large Camera LED Tags Warehouse SG-VLC Position Information APP Industrial application Size, cost and power consumption reduction of Image Sensor Various Mobile Terminals Information collection from Various LEDs 11

13 Image sensor in future mobile phone LED light LED sign Received information will be shown on LCD display with Image AR Sales promotion AR: Augmented Reality Emergency information LED traffic light Bus for Airport LED head light SG-VLC Bus for Beach 12

14 Example of High-speed Image Sensor 2400 fps Image Sensor is used to receive 1200bps Optical Signal 13

15 Optical signal detection LED only Position possibility 100 環境光なし ID あり (PRE 検出時 ) 80 With interference light Position possibility X 環境光あり ID あり (PRE 検出時 ) Y Optical signal can be detected W/WO interference light SG-VLC X Y 14

16 Q&A 15