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1 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos) (Regular Paper) 22 4, (JBE Vol. 22, o. 4, July 2017) ISS (Online) ISS (Print) Optical Flow CCTV a), a), a), a), b) Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos Jihae Kim a), okyung Shin a), Jaekyung Kim a), Cheolhee Kwon a), and Hyeran Byun b) CCTV. (IPM, Inverse Perspective Mapping), 1), 2). (Optical flow). CCTV 106,993, 88.94%. Abstract This paper proposes a vehicle counting and speed estimation method for traffic situation analysis in road CCTV videos. The proposed method removes a distortion in the images using Inverse perspective Mapping, and obtains specific region for vehicle counting and speed estimation using lane detection algorithm. Then, we can obtain vehicle counting and speed estimation results from using optical flow at specific region. The proposed method achieves stable accuracy of 88.94% from several CCTV images by regional groups and it totally applied at 106,993 frames, about 3 hours video. Keyword : Vehicle Counting, Vehicle Speed Estimation, Inverse Perspective Mapping, Optical Flow, Traffic Situation Analysis a) LIG.Project 5(LIG ex1 Avionics R& Lab) b) (Yonsei University, ept. Computer Science) Corresponding Author : (Hyeran Byun) hrbyun@yonsei.ac.kr Tel: ORCI: () (o ,eep Learning ) Manuscript received April 3, 2017; Revised July 7, 2017; Accepted July 7, Copyright 2017 Korean Institute of Broadcast and Media Engineers. All rights reserved. This is an Open-Access article distributed under the terms of the Creative Commons BY-C- ( which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited and not altered.

2 (JBE Vol. 22, o. 4, July 2017). 10 (ITS, Intelligent Transportation System) [1]-[3],. ITS.. [4],[5],[6],[7],[8].,..... [4]-[6],[9]... [4],[5]. (OF, Optical Flow), (F, Frame ifference), (BS, Background Subtraction)., - [10] (Vision) [6],[7],[9],[11],[12].. CCTV (IPM, Inverse Perspective Mapping) [13] -(Top-view) Fig. 1. The flow of the proposed method. 2, 3 IPM.. 4, 5.

3 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos)..,. 1.. (F, Frame ifference), (BS, Background Subtraction), (OF, Optical Flow) [4],[5],[14]-[16]. (F, Frame ifference) [4],[5].,,. (BS, Background Subtraction) [14],[16].. (background modeling).,,. [14],[16] CCTV. (OF, Optical Flow) [15],[17].. 2. /, -, - [6],[7],[9],[11],[12],[18].. Inertial avigation System(IS) (wheel speed sensor)..,. height-precision GPS. GPS,. - [18] kinematic dynamics model... - [6],[7],[9],[11],[12]. [7],[11]. [12] Lucas- Kanade Horn-Schunck.. CCTV CCTV. CCTV

4 (JBE Vol. 22, o. 4, July 2017) 1) (IPM, Inverse Perspective Mapping), 2), 3) (OF, Optical Flow), 4) 4. (perspective distortion) IPM -,.., IPM IPM (IPM, Inverse Perspective Mapping). 2, 3. [19]. 2 (resampling). 2 (Euclidean). (), ( ) ( ), (), () (2) 2 3. CCTV... (IPM, Inverse Perspective Mapping) [13] -. tan cos tan sin (a) Input image (b) Vanishing point detection (c) Result of IPM 2. Fig. 2. Examples of applying IPM

5 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos) 2 IPM., IPM. 2. IPM -. [13],[20] 3. 3(a) 3.1 IPM -. -., -(top-hat). 3(b), 3(c). [21] (structuring element),. 3(d). (column), 5 (bin). 3(e) - 3(f). 2/3, 20. 3(g). -. (3) n-1, n ( ) 0.6,. 3. Fig. 3 Flow of lane detection algorithm

6 (JBE Vol. 22, o. 4, July 2017) 3. CCTV. IPM. Farneback (dense optical flow)..,. (sparse optical flow), (dense optical flow). Lucas-kanade,.. Farneback. Farneback. 4 step. 3.2,. 4. Fig. 4. Example of motion measuring regionounting Fig. 5 The flow of vehicle counting

7 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos). (maxflow) (4). max max max,, ( ) ( ) (5), (6).,.. 4. CCTV. Lucas-Kanade. 3.2 Lucas-Kanade.., Lucas-Kanade,.... ( ) 1000cm(10m). (7).,,,. (7). (8)., (7), FPS C km/h. (8). 1.. CCTV.

8 (JBE Vol. 22, o. 4, July 2017). 1. 2, 3, 4. (ay) (ight) 16., 106, Table 1. Test set composition for experiment CCTV ay ight total Busan 7,000 6,218 13,218 Goyang 7,000 7,000 14,000 Gimpo1 7,000 7,000 14,000 Gimpo2 5,575 6,787 12,362 Yangsan 7,000 7,000 14,000 Ceongdo 7,000 7,000 14,000 Suseong 5,873 5,813 11,686 amyangju 6,727 7,000 13,727 total 53,175 53, , Table 2. Composition of testset for evaluation # lane CCTV 4 G Busan_ Busan_ oyang_ Goyang_ 3 Gimpo1_ Gimpo2_ Yangsan_ Gimpo1_ Gimpo2_ Yangsan_ 2 Ceongdo_ Suseong_ amyangju_ Ceongdo_ Suseong_ amyangju_

9 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos) 2.. ground truth. (9) (10)., G ground truth, C. (9) AE (10) ground truth(g), experimental result(c),,. 3 4, 4 5 3, ground truth(g), experimental result(c), % %, 87.32%.. 7 (background subtraction) [14], (optical flow) Lucas-kanade.,,, 56.94%, 63.57%, 88.94%.. Gimpo Table 3. Experiment result of 4 lanes of video CCTV Lane 1 Lane 2 Lane 3 Lane 4 total ground truth experimental result accuracy(%) Busan average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) Goyang average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h)

10 (JBE Vol. 22, o. 4, July 2017) 4. 3 Table 4. Experiment result of 3 lanes of video CCTV Lane 1 Lane 2 Lane 3 total Gimpo1 Gimpo2 Yangsan ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) Table 5. Experiment result of 2 lanes of video CCTV Lane 1 Lane 2 total ground truth experimental result accuracy(%) Ceongdo average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) Suseong average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h) ground truth experimental result accuracy(%) amyangju average speed(km/h) ground truth experimental result accuracy(%) average speed(km/h)

11 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos) 6. Table 6. Accuracy of vehicle counting on day and night video Accuracy(%) ay ight total Fig. 6. Result of vehicle counting experiment 7. Fig. 7. Result of vehicle counting with comparative experiment

12 (JBE Vol. 22, o. 4, July 2017) 8. Fig. 8. Result of vehicle speed estimation... Farneback, Lucas-kanade.. Farneback. 8.,... CCTV. (IPM, Inverse Perspective Mapping),..,, CCTV..,

13 4: Optical Flow CCTV (Jihae Kim et al.: Optical Flow Based Vehicle Counting and Speed Estimation in CCTV Videos). (References) [1] EunJu Lee, Jae-Yeal am, ByoungChul Ko, Speed-limit Sign Recognition Using Convolutional eural etwork Based on Random Forest, The Korean Institute of Broadcast and Media Engineers, pp , [2] Kum, Chang-Hoon, Cho, ong-chan, Kim, Whoi-Yul, evelopment of Lane etection System using Surrounding View Image of Vehicle, The Korean Institute of Broadcast and Media Engineers, pp , [3] Hyung-Sub Kang, ong-chan Cho and Whoi-Yul Kim, Passing Vehicle etection using Local Binary Pattern Histogram, The Korean Institute of Broadcast and Media Engineers, pp , [4] A. Tourani and A. Shahbahrami, Vehicle Counting Method Based on igital Image Processing Algorithms, IEEE Transactions on International Conference on Pattern Recognition and Image Analysis, pp. 1-6, [5] Y. Xia, X. Shi, G. Song, Q. Geng and Y. Liu, Towards imporving quality of video-based vehicle counting method for traffic flow estimation, Signal Processing, pp , [6] X. Qimin, L. Xu, W. Mingming, L. Bin and S. Xianghui, A Methodology of Vehicle Speed Estimation Based on Optical Flow, IEEE International Conference on Service Operations and Logistics and Informaitcs, pp , [7] J. Lan, J. Li, G. Hu, B. Ran, L. Wang, Vehicle speed measurement based on gray constraint optical flow algorithm, International Journal of Light and Eletron Optics, pp , [8] M.S. Shirazi and B. Morris, A Typical Video-based Framework for Counting, Behavior and Safety Analysis at Intersections, IEEE Transactions on Intelligent Vehicles Symposium, pp , [9] S.C. iamantas and P. asgupta, Active Vision Speed Estimation from Optical Flow, Towardss Autonomous Robotic Systems, pp , [10] X. Yu, X. Gao, Review of Vehicle State Estimation Problem under riving Situation, Chinese Journal of Mechanical Engineering, pp , [11].C. Luvizon, B.T. assu and R. Minetto, Vehicle speed estimation by license plate detection and tracking, IEEE International Conference on Acoustics, Speech and Signal Processing, pp , [12] E. Patel and. Shukla, Comparison of Optical Flow Algorithms for Speed etermination of Moving Objects, International Journal of Computer Applications, Vol. 63, o. 5, pp , [13]. ing, J.S. Yoo, J.K. Jung and S. Kwon, An Urban Lane etection Method Based on Inverse Perspective Mapping, GCIT, Advanced Science and Technology Letters, vol. 63 pp.53-58, [14] S. Aslani and H. Mahdavi-asab, Optical Flow Based Moving Object etection and Tracking for Traffic Surveillance, International Journal of Electrical, Computer, Energetic, Electronic and Communication Engineering, Vol. 7, o. 9, pp , [15] A. Glowacz, Z. Mikrut and P. Pawlik, Video etection Algorithm Using an Optical Flow Calculation Method, Multimedia Communications, Services and Security, Vol. 287, pp , [16] H.Y. Cheng and S.H. Hsu, Intelligent Highway Traffic Surveillance With Self-iagnosis Abilities, IEEE Transactions on Intelligent Transportation Systems, Vol. 12, o. 4, pp , [17] M. Mizushima, Y. Taniquchi, G. hasegawa, H. akano and M. Matsuoka, Counting Pedestrians Passing through a Line in Video Sequences based on Optical Flow Extraction, Recent Advances in Circuits, Systems and Automatic Control, pp , [18] K. Jo, K. Chu, K. Lee, M. Sunwoo, Integration of Multiple Vehicle Models with IMM Filter for Vehicle Localization, IEEE Transactions on Intelligent Vehicles Symposium, pp , [19] M. Bertozzi, A. Broggi and A. Fascioli, An extension to the Inverse Perspective Mapping to handle non-flat roads, IEEE International Conference on Intelligent Vehicle, pp , [20] M. Aly, Real time etection of Lane Markers in Urban Streets, IEEE Transactions on Intelligent Vehicles Symposium, [21] S. Suzuki and K. Abe, Topological Structural Analysis of igitized Binary Images by Border Following, Computer Vision, Graphics, and Image Processing, Vol. 30, o. 1, pp , [22] L. Imsland, T.A. Johansen, T.I. Fossen, et al, Vehicle velocity estimation using nonliear observer, Automatica, pp , [23] R. Zhao and X. Wang, Counting Vehicles from Semantic Rigions, IEEE Transactions on Intelligent Transportation Systems, Vol. 14, o. 2, pp , 2013.

14 (JBE Vol. 22, o. 4, July 2017) : () ~ : LIG - ORCI : - :,,, : () : () ~ : LIG - ORCI : - :,,, : CW() ~ : LIG - ORCI : - :,, CW : () ~ : LIG - ORCI : - : RF,, : () : () : University of Illinois, Computer Science(M.S.) : Purdue University, Computer Science(Ph..) ~ 1995 : ~ 1998 : ~ 2003 : ~ : - ORCI : - :,,

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