Journal of the Institute of Electronics and Information Engineers (전자공학회논문지)

The Institute of Electronics and Information Engineers (대한전자공학회)
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A Vehicle Speed Measurement System Implementation using a Stereo Camera and a License Plate Recognition Algorithm

스테레오 카메라와 번호판 인식 알고리즘을 활용한 차량 속도 측정 시스템 구현

  • Kim, Young-Mo (School of Electronics Engineering, College of IT Engineering, Kyungpook National University) ;
  • Rheu, Jee-Hyung (School of Electronics Engineering, College of IT Engineering, Kyungpook National University) ;
  • Choi, Doo-Hyun (School of Electronics Engineering, College of IT Engineering, Kyungpook National University)
  • 김영모 (경북대학교 IT대학 전자공학부) ;
  • 류지형 (경북대학교 IT대학 전자공학부) ;
  • 최두현 (경북대학교 IT대학 전자공학부)
  • Received : 2016.01.27
  • Accepted : 2016.07.02
  • Published : 2016.07.25
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Abstract

This paper presents and implements a vehicle speed measurement system using a license plate recognition system and a stereo camera. Using the feature points of the license plate recognition system, the disparity information is extracted and then the distance to the feature points is calculated by using the disparity information. In this paper, a vehicle speed is measured using the adjacent distances from consecutive stereo images and the corresponding time of the distances. Actual vehicle speed is also measured using the reference measurement equipment (tape switch based system) in order to test the accuracy of the proposed speed measurement system. The implemented stereo based speed measurement system shows appropriate result within specification both in the daytime and nighttime experiments.

본 논문에서는 번호판 인식 시스템과 스테레오 카메라를 이용한 차량의 속도 측정 시스템을 제안하고 구현한다. 차량 번호판 인식의 결과로 나오는 특징점을 활용하여 스테레오 영상의 양안 차 정보를 추출하고 이를 이용하여 해당 특징점까지의 거리를 계산한다. 본 논문에서는 인접 스테레오 영상에서 계산된 특징점까지의 거리와 각 거리에 해당하는 시간 정보를 이용하여 차량의 속도를 측정한다. 제안한 속도 측정 시스템의 정확도를 확인하기 위해 테이프 스위치로 된 기준 측정 장비를 사용하여 속도를 비교하였다. 주간과 야간 2회에 걸쳐 실시한 시험 결과에서도 알 수 있듯이 구현된 스테레오 기반 속도 측정 시스템은 경찰청 기준 오차 범위를 만족하는 속도 측정 결과를 보였다.

Keywords

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