The Journal of The Korea Institute of Intelligent Transport Systems (한국ITS학회 논문지)

The Korea Institute of Intelligent Transport Systems (한국ITS학회)
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15×15 Kernel Block Adaptive Median Filter based on LED Illumination Detection Algorithm for Low Rate CamCom

15×15 Kernel Block Adaptive Median Filter를 적용한 저속 카메라 통신용 LED 조명 검출 알고리즘 연구

  • Han, Jungdo (Dept. of Integrated IT Eng., Seoul National Univ. of Science and Tech) ;
  • Lee, Minwoo (IoT Convergence Research Technology Lab., Seoul National Univ. of Science and Tech) ;
  • Cha, Jae Sang (Dept. of Electronics and IT Media Eng., Seoul National Univ. of Science and Tech)
  • 한정도 (서울과학기술대학교 IT융합공학과) ;
  • 이민우 (서울과학기술대학교 IoT융복합기술연구소) ;
  • 차재상 (서울과학기술대학교 전자IT미디어공학과)
  • Received : 2018.10.01
  • Accepted : 2018.10.16
  • Published : 2018.10.31
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Abstract

With the rapid development of RF based high speed wireless communication technology, devices that can be applied to IoT networks based on RF bandwidth are rapidly spreading, nevertheless, the development speed of the RF communication is not possible to keep up with the spread of the RF band for wireless communication. In this situation, OWC technology that uses visible light source as a transmitter is attracting attention as a technology that can overcome the band exhaustion problem of RF based wireless communication technology. Although, due to the distortion of the LED illumination shape by camera exposure time and LED blinking period, the LED illumination detection rate is degraded and the RoI setting is inaccurate. In this paper, we propose an adaptive median filter applied LED illumination detection algorithm for low rate CamCom, it is possible to detect a clear RoI and LED illumination. This research will be able to play a role as a complementary material of RF based wireless communication technology efficiently.

RF 기반 고속 무선통신 기술이 급속히 발전함에 따라 무선 주파수 대역을 기반으로한 IoT 네트워크용 디바이스가 빠르게 보급되고 있으나, 최근 IoT 네트워크 디바이스의 급속한 확산 속도에 비하여 RF 통신 기술의 발전속도가 미치지 못하고 있다. 이러한 상황에서 가시광원을 송신수단으로 사용하는 OWC 기술은 RF 기반 무선 통신의 대역 고갈 문제를 극복 할 수 있는 기술로서 주목받고 있으나, OWC용 데이터 수신 중 발생하는 LED 조명 형태의 왜곡으로 인하여 LED 조명 검출율이 저하되고 RoI의 설정이 부정확해지는 현상이 발생 할 가능성이 있다. 본 논문에서는 Adaptive Median Filter를 적용한 저속 카메라 통신용 LED 조명 검출 알고리즘을 제안하였다. 이를 통해 명확한 RoI 설정 및 LED 조명 검출이 가능할 것으로 사료되며, 본 연구결과를 통해 RF 기반 무선 통신기술의 보완재로서의 역할을 효율적으로 수행 할 수 있을 것으로 판단된다.

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References

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