차량 사이의 텍스트메시지 교환을 위한 단거리 광카메라통신시스템 시연
Demonstration of Short-Range OCC System for Vehicle-to-Vehicle Text Message Exchange
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본 논문은 차량 사이의 텍스트 메시지 교환을 위한 단거리 광 카메라 통신시스템 시연결과를 제시한다. 텍스트 메시지 전송을 위한 송신기로 저전력 적외선 LED 배열을 사용한다. 송신기의 배열형 LED는 송신 문자에 따라 패턴이 변화하고, 수신기에서 해당 LED배열의 패턴이 영상으로 수신된다. 수신기로 시중의 상보성 금속산화물반도체(CMOS)로 구성된 이미지 센서에 기반한 USB웹 카메라를 사용한다. USB 웹 카메라는 송신기의 LED패턴을 수신하고 수신된 영상은 PC에서 처리되어 원본 텍스트 메시지를 복원하게 된다. 디코딩 과정은 Python에서 OpenCV를 활용하여 구현된다. 실험 결과에 따르면, 제안된 광카메라통신시스템은 5미터 거리에서 초당 10개의 문자 전송률로 동작할 경우, 1.6 %의 프레임 에러율로 데이터를 복원할 수 있다.
Abstract
This paper presents a demonstration of an short-range optical camera communication (OCC) system for vehicle-to-vehicle (V2V) text message exchange. The transmitter uses an array of low-power infrared (IR) light-emitting diodes (LEDs) to transmit text messages. The lighting patterns in the transmitter LED array vary with different characters, which are detected as different images at the receiver. The receiver is a commercial complementary metal oxide semiconductor (CMOS)-based USB web camera. The USB web camera receives the pattern of the transmitter LEDs and the received images are processed in PC to recover original text messages. The decoding process is implemented using OpenCV with Python. According to the experiment results, the data can be retrieved with 1.6 % frame error rate in a range up to 5 m at a data rate of 10 characters per second.
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