LED a) A New LED Array Acquisition Method Focusing on Time-Gradient and Space- Gradient Values for Road to Vehicle Visible Light Communication Syunsuk

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1 VOL. J97-B NO. 7 JULY 2014 本 PDF の扱いは 電子情報通信学会著作権規定に従うこと なお 本 PDF は研究教育目的 ( 非営利 ) に限り 著者が第三者に直接配布することができる 著者以外からの配布は禁じられている

2 LED a) A New LED Array Acquisition Method Focusing on Time-Gradient and Space- Gradient Values for Road to Vehicle Visible Light Communication Syunsuke USUI a), Takaya YAMAZATO, Hiraku OKADA, Toshiaki FUJII, Keita TAKAHASHI, Tomohiro YENDO, and Shintaro ARAI LED LED LED LED LED LED 2 LED 1. LED [1] [5] LED LED LED LED Nagoya University, Furo-cho Chikusa-ku Nagoya-shi, Japan Nagaoka University of Technology, Nagaoka-shi, Japan Kagawa National College of Technology, Mitoyo-shi, Japan a) usui@katayama.nuee.nagoya-u.ac.jp [6] LED LED LED LED LED LED LED LED LED LED LED LED LED 536 B Vol. J97 B No. 7 pp c 2014

3 LED LED LED [6] LED LED LED LED [7] 2 LED LED LED LED LED [8] LED LED LED LED 2 LED LED LED [9] LED LED LED ( ) LED [8] LED LED ON-OFF ON- OFF (OOK) LED OOK LED LED OOK LED LED LED LED [10] LED LED 1 Fig. 1 System model. 537

4 2014/7 Vol. J97 B No. 7 2 Fig. 2 Packet format. 3 Fig. 3 Captured images in time series. ( ) LED LED 2 LED LED 2 LED 3. LED [8] LED ON OFF 4( ) y = N 4( ) (x, t) 3. 2 LED LED LED 4( ) 4 Fig. 4 Spatio-temporal image and Spatio-temporal cross-section imege. LED LED LED 4( ) LED LED 5 (G t) (G s) LED 90m LED LED LED LED LED 538

5 LED Fig. 5 5 Scatter diagram of time/space gradient value Fig. 6 Scatter diagram of time/space gradient value (averaging 10 frames). LED LED LED 2 5 LED LED LED LED 1000fps LED LED 10 6 LED LED LED 6 G t a G s b 0 (1) LED a b G t 5. LED LED k LED 5. 1 I(x, y, t) Sobel Sobel [11] t = n G t(x, y, n) G s(x, y, n) G t(x, y, n) = {G t1} 2 + {G t2} G t1 = s 1(k, l)i(x + k, y, n + l) k= 1 l= 1 539

6 2014/7 Vol. J97 B No. 7 G t2 = 1 k= 1 l= 1 1 s 1(k, l)i(x, y + k, n + l) (2) G s(x, y, n) = {G s1} 2 + {G s2} G s1 = s 1(k, l)i(x + k, y + l, n) G s2 = k= 1 l= 1 1 k= 1 l= 1 1 s 2(k, l)i(x + k, y + l, n) (3) s 1(k, l) s 2(k, l) Sobel s 1(k, l) = s 2(k, l) = (4) k G t(x, y, n) G s(x, y, n) G t(x, y, n) = 1 k 1 G t(x, y, n l) (5) k l=0 G s(x, y, n) = 1 k 1 G s(x, y, n l) (6) k l= LED LED D(x, y, n) { 255 (A satisfied) D(x, y, n) = (7) 0 (otherwise) A : G t(x, y, n) a G s(x, y, n) b 0 a b a b G t D(x, y, n) 255 LED LED D(x, y, n) LED LED D(x, y, n) LED D(x, y, n) 1 LED 2 1 LED 5. 4 D(x, y, n) 255 c r pixel LED k a G t b 6. 1 a b [9] a b a b 6 a = b = a b 6 7 LED LED LED 50pixel 50 pixel LED a b 2 KL [9] k LED LED KL k k k 540

7 LED 8 90m Fig. 8 Captured images from distance 90m. 7 Fig. 7 Discriminant line by Fisher s linear discriminant. 1 Table 1 Parameters of experiment. LED blinking frequency 500Hz Capturing frame rate 1000fps Distance from LED 30m 90m LED blinking pattern On/Off Random Vehicle speed 30km/h Time Weather Daytime Sunny Image resolution pixel 9 LED Fig. 9 LED Array at each distances km/h LED 90-30m 90m 30m LED LED 8 90m 9 30m 50m 70m 90m LED LED LED LED LED 10 LED Fig. 10 Blinking pattern. LED ( ) LED LED LED On/Off( 10 ( )) Random( 10 ( )) On/Off LED ON OFF Random LED Random LED [12] S S(x, y, n) =G t(x, y, n) a G s(x, y, n) (8) 541

8 2014/7 Vol. J97 B No k Fig. 11 Number of false flames versus k. 12 Random 30m Fig. 12 Scatter diagram (Blinking pattern Random, distance 90m). b b = ϕ max{g t(x, y, n) a G s(x, y, n)} (9) S ϕ b S LED LED 1 LED LED b 6. 3 k 4. 2 LED LED LED a ϕ k 500 a =0.7 ϕ = Random 90m Fig. 13 Scatter diagram (Blinking pattern Random, distance 90m). 11 k 14 k =15 Random 90m Random 20m LED ( ) LED LED Random 15 30m 90m LED 542

9 LED 14 a Fig. 14 Survival LED pixels versus a. 15 ϕ Fig. 15 Number of false flames versus ϕ a LED 5 5pixel LED (8) S LED S S LED ( ) LED LED (5. 3 (1) (2)) 15 a average a average a = G t b a =0.7 k =15 (9) ϕ 500 ϕ 15 ϕ Fig. 16 Result of comparing with conventional method. ϕ Random 90m a =0.7 k =15 ϕ =0.7 [7] 1 10m on/off 100% 543

10 2014/7 Vol. J97 B No. 7 Random 16 62% 11% LED LED 100% 7. LED LED LED LED LED 2 LED LED LED LED JSPS C [1] T. Komine and M. Nakagawa, Fundamental analysis for visible-light communication system using LED lights, IEEE Trans. Consum. Electron., vol.50, no.1, pp , Feb [2] G.-K.-H. Pang, C.-H. Chan, and T.T.O. Kwan, Tricolor light-emitting diode dot matrix display system with audio output, IEEE Trans. Ind. Appl., vol.37, no.2, pp , March/April [3] H.-S, Liu and G. Pang, Positionning beacon system using digital camera and LEDs, IEEE Trans. Veh. Technol., vol.52, no.2, pp , March [4] LED CS , March [5] M. Akanegawa, Y. Tanaka, and M. Nakagawa, Basic study on traffic information system using LED traffic lights, IEEE Trans. Intelligent Transportation Systems, vol.2, no.4, pp , Dec [6] M. Wada, T. Yendo, T. Fujii, and M. Tanimoto, Road-to-vehicle communication using LED traffic light, IEEE Intelligent Vehicles Symposium 2009, pp , June 2009 [7] B vol.j95-b, no.11, pp , Nov [8] S. Usui, T. Yamazato, S. Arai, T. Yendo, T. Fujii, and H. Okada, Utilization of spatio-temporal image for LED array acquisition in road to vehicle visible light communication, ITS WORLD CONGRESS TOKYO 2013, Oct [9] C.M. Bishop, Pattern Recognition and Machine Learning, Springer, [10] Y. Shiraki, T. Nagura, T. Yamazato, S. Arai, T. Yendo, T. Fujii, and H. Okada, Robust receiver design for road-to-vehicle communication system using LED array and high-speed camera, 18th World Congress on Intelligent Transport Systems, Oct [11] W.K. Pratt, Digital image processing, Wiley- Interscience publication, New York, [12] T. Nagura, T. Yamazato, M. Katayama, T. Yendo, T. Fujii, and H. Okada, Tracking an LED array transmitter for visible light communications in the driving situation, IEEE International Symposium on Wireless Communication Systems (ISWCS2010), pp , Sept ITS IEEE 544

11 LED ITS e IEEE IEEE ACM ComEX Best Letter Award ( ) 10TAO 3D 14JST CREST VR IEEE ITS 23 ITS ITS 20 IEEE ITS 8 IEEE IRT 3 545

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