The Journal of Korean Institute of Communications and Information Sciences (한국통신학회논문지)

The Korean Institute of Commucations and Information Sciences (한국통신학회)
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Study on Low Delay and Adaptive Video Transmission for a Surveillance System in Visual Sensor Networks

비디오 센서 망에서의 감시 체계를 위한 저지연/적응형 영상전송 기술 연구

  • Lee, In-Woong (Yonsei University Department of Electrical and Electronic Engineering) ;
  • Kim, Hak-Sub (Yonsei University Department of Electrical and Electronic Engineering) ;
  • Oh, Tae-Geun (Yonsei University Department of Electrical and Electronic Engineering) ;
  • Lee, Sang-Hoon (Yonsei University Department of Electrical and Electronic Engineering)
  • Received : 2014.03.19
  • Accepted : 2014.05.08
  • Published : 2014.05.31
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Abstract

Even if it is important to transmit high rate multimedia information without any transmission errors for surveillance systems, it is difficult to achieve error-free transmission due to infra-less adhoc networks. In order to reduce the transmission errors furthermore, additional signal overheads or retransmission of signals should be required, but they may lead to transmission delay. This paper represents a study on low delay and adaptive video transmission for the unmanned surveillance systems by developing system protocols. In addition, we introduce an efficient and adaptive control algorithm using system parameters for exploiting unmanned surveillance system properly over multi-channels.

비디오 센서 망을 이용한 무인 감시 체계에서는 고용량의 영상 정보를 왜곡 없이 전송하는 것이 중요하다. 하지만, 무선 채널의 특성상 왜곡 발생이 최소화 되도록 처리할 경우, 불필요한 전송 신호의 추가 또는 정보의 재전송 등으로 인해, 전송 자체의 지연을 초래하는 효과로 연결된다. 따라서 비디오 센서 망 기반의 감시 체계는 무인 체계와 운용자 사이 또는 무인체계들 사이에 고용량의 영상 정보를 압축하면서, 실시간 정보의 특성에 알맞도록 지연시간을 줄이고 시시각각 변화하는 감시 체계에 적합하게 전송할 수 있는 저지연/적응형 영상 전송 기술을 설계하는 것이 중요하다. 본 고에서는, 무인체계의 전체 시스템 프로토콜을 상기의 목표에 맞게 설계하고, 다양한 무선 환경에서 실현할 수 있는 영상전송 기술을 소개 한다. 원활한 무인체계 통신단말 운용을 위해 대용량의 다채널 영상 정보를 효율적이면서 지연이 적게 압축하고, 통신 상태 변화에 따라 유연하게 크로스 레이어 관점에서 영상의 정보를 계층적 부호화 (Layered Coding)를 기반으로 우선 순위에 기반하여 저지연 및 적응적으로 전송하는 기술을 소개한다.

Keywords

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