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IPTV 서비스 영상에 대한 객관적 품질측정 방안 연구

Research for measuring degradation of IPTV-serviced videos

  • 김원준 (한국정보통신대학교 시각정보처리연구실) ;
  • 김창익 (한국정보통신대학교 시각정보처리연구실) ;
  • 김진술 (한국전자통신연구원 방송통신융합연구부분 네트워크연구부 QPS인프라연구팀) ;
  • 이현우 (한국전자통신연구원 방송통신융합연구부분 네트워크연구부 QPS인프라연구팀) ;
  • 류원 (한국전자통신연구원 방송통신융합연구부분 네트워크연구부 QPS인프라연구팀)
  • Kim, Won-Jun (Information and Communications University) ;
  • Kim, Chang-Ick (Information and Communications University) ;
  • Kim, Jin-Sul (Electronics and Telecommunications Research Institute) ;
  • Lee, Hyun-Woo (Electronics and Telecommunications Research Institute) ;
  • Ryu, Won (Electronics and Telecommunications Research Institute)
  • 발행 : 2008.07.30

초록

최근 IP 기반의 멀티미디어 서비스가 증가하면서 IPTV에 대한 수요가 급증할 것으로 예상되고 있다. IPTV는 케이블을 이용하는 기존의 TV와 달리 IP 네트워크 기반의 다양한 서비스 제공이 가능하다. 그러나 IPTV 서비스 품질은 패킷 손실, 지터와 같은 네트워크 열화에 크게 영향을 받기 때문에 언제나 안정된 서비스를 보장하기가 힘들다. 본 논문에서는 다양한 영상 열화에 대하여 주관적 평가를 반영한 IPTV 서비스 품질측정 방안을 도출한다. 이를 위하여 시청자에게 인지적으로 영향을 줄 수 있는 열화 항목을 선정하였으며 선정된 각 열화 항목에 대하여 측정 메트릭을 제안하였다. 각 열화 항목에 대하여 MOS(Mean Opinion Score) 기반의 주관적 평가를 수행하였으며 제안한 메트릭의 측정 결과를 주관적 평가에 사상시켜 주관적 인지 상태를 고려하는 항목별 객관적 품질측정 기준을 도출한다. 다양한 영상에 대한 실험을 통해 개발된 품질측정 메트릭이 주관적 측면을 잘 반영하고 있음을 확인할 수 있다.

With the advent of IP-based multimedia service based on IP network, there is a rapidly increasing demand for IPTV. Unlike the previous coaxial cable based TV, IPTV provides a variety of convergence services based on IP newark. However, since the IPTV service quality is a lot affected by the network degradation such as packet loss and jitter, it may not be guaranteed. In this paper, we propose an objective measure for various degradations of IPTV-based videos considering subjective assessment. To this end, we first determine QoE(Quality of Experience) indicators, which can affect human visual perception. Then we develop the video quality metric for each QoE indicator. Subjective assessment based on MOS is conducted and used to construct mapping relationship between each measure and perceived visual quality. Experiments are performed on various videos to confirm the efficiency and robustness of the proposed method and show high correlation with subjective assessment.

키워드

참고문헌

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