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스케일러블 비디오의 무선 전송을 위한 인터리빙 기반 순방향 오류 정정 알고리즘
하호진(Hojin Ha) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.10
This paper proposes an interleaving-based forward error correction (FEC) scheme for scalable video wireless transmission. Since a scalable video transmission over wireless channel causes the steep degradation of video quality due to successive packet losses, it is required to utilize an efficient error control algorithm. A novel layer-based interleaving block structure is proposed to efficiently disperse consecutive packet losses into several scalable layers. Also, an FEC assignment algorithm using a simple layer-based error propagation in the hierarchial prediction structure is proposed for minimizing video quality degradation from packet losses. The simulation results show that the proposed algorithm achieves improved performance in various channel status, compared to the previous FEC algorithm.
하호진(Hojin Ha),서현곤(HyunGon Seo) 한국경영과학회 2014 經營 科學 Vol.31 No.4
Recently, various types of information and communication technology (ICT) such as cloud computing, big data, and virtual reality have been progressed in the world. Also, it is expected that there are many domestic and foreign visitors in Gangwon-do due to the Pyeongchang winter olympic games in 2018. In this environment, it is necessary to improve the competitiveness of Gangwon-do in winter sports areas exploiting both existing IT infrastructure and application technologies. In this paper, for sustainable development of Gangwon-do winter sports IT industry after the Olympics, we propose efficient implementation methods of 3 winter sports IT convergence services and Gangwon-do ICT activation strategy. The proposed 3 winter sports IT service areas are as follows. 1) Realistic winter sports IT service, 2) Winter sports medical IT service 3) Winter sports record analysis IT service.
강인한 스케일러블 비디오 전송을 위한 무선 채널의 손실 분포 기반 비대칭 손실 보호 알고리즘
하호진(Hojin Ha) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.3
This paper presents an unequal loss protection (ULP) scheme considering wireless channel characteristics for scalable video transmission with distortion minimization over wireless networks. Since previous ULP algorithms for scalable video utilize only the dependencies in scalable layers, burst packet loss in wireless communication significantly decreases the quality of video. In this paper, firstly, we propose the novel error propagation model including the amount of error propagation in scalable video layers and the packet loss characteristics according to variable channel status. Packet loss characteristics are exploited for improving the recovery rate by error correction in scalable layers. Then we propose the model-based unequal loss protection assignment algorithm. Compared to previous ULP schemes, simulation results show that the proposed ULP scheme gives substantial improvement for the received video quality and the graceful degradation of video quality in various packet loss rate environments.
패킷 손실 네트워크에서 스케일러블 비디오를 위한 비대칭 에러 전파 기반 FEC 알고리즘
하호진(Hojin Ha) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.2
This paper proposes an efficient unequal forward error correction(FEC) algorithm for scalable video transmission over packet-erasure networks. Layer-based scalable video occurs a lot of quality degradation due to the strong dependencies between base layer and enhancement layers So the proposed algorithm, firstly proposes the novel layer-based error propagation model considering both hierarchical coding structure for temporal scalability and layer dependencies for quality scalability. Then based on the proposed error propagation model and the current packet loss rate, the FEC assignment algorithm is proposed for minimizing the degradation of video quality. Compared with the previous FEC methods, the proposed method shows large amounts of quality improvements in various channel environments.
스케일러블 비디오의 프레임 재생율을 이용한 비대칭 손실 보호 알고리즘
하호진(Hojin Ha),이경호(Kyongho Lee) 한국정보기술학회 2013 한국정보기술학회논문지 Vol.11 No.11
This paper proposes an unequal loss protection(ULP) algorithm for improving scalable video streaming quality over packet-lossy networks using the forward error correction(FEC) mechanism. The proposed ULP algorithm is developed by the unequal importance in both temporal and quality layers of hierarchical scalable video coding structure. For efficient FEC code assignment, the proposed ULP algorithm utilizes a simple and efficient performance metric, playable frame rate(PFR). The PFR is adopted for quantifying the unequal block recovery rate of temporal and quality layers. Compared to other ULP algorithms, the proposed ULP algorithm demonstrates higher PSNR values for various channel status.
다수 사용자 OFDM 시스템에서의 비디오 전송을 위한 비례 율 적용 왜곡 최소화 자원 할당 방법
하호진(Hojin Ha),임창훈(Changhoon Yim),김영용(Young Yong Kim) 한국통신학회 2008 韓國通信學會論文誌 Vol.33 No.7B
본 논문은 다수의 비디오를 전송하는 직교 주파수 다중 분할 시스템의 다운링크에서 종단간 비디오에서 발생하는 왜곡을 최소화하는 자원 할당 방법을 제안한다. 제안된 알고리즘은 제한된 시스템 리소스에서 다수 사용자의 다양성과 패킷 왜곡 모델을 이용한 비트 왜곡 함수를 이용하여 전체 사용자의 비디오 왜곡을 최소화 한다. 첫 단계에서, H.264 비디오 코딩 구조에 존재하는 에러 은닉과 전파를 이용하여 비트 왜곡 함수를 유도한다. 두 번째 단계에서는 전체적인 비디오 화질 저하를 최소화하기 위해서, 직교 주파수 다중 분할 시스템의 자원을 사용자의 다양성을 이용하여 부 반송파와 파워를 할당하는 자원 할당 알고리즘을 제안한다. 또한 각 사용자에 의해서 요구되는 비디오 화질을 얻기 위해서, 비례 율의 요소를 적용한다. 실험결과에서, 제안된 자원할당 알고리즘은 기존의 시간 분할 다중 접속 방법 그리고 비트 왜곡의 정보를 이용하지 않는 알고리즘과 비교해서, 종단간의 비디오 화질을 크게 향상시키는 결과를 보였다. This paper proposes a resource allocation algorithm for minimizing the overall distortion of multiple users in orthogonal frequency division multiplex (OFDM). The proposed algorithm exploits the diversity of multiuser and the rate-distortion function using packet distortion model in a system with limited resources. We first induce a rate-distortion function considering error concealment and error propagation properties of H.264 video structures. Then we perform adaptive resource allocation utilizing multiuser diversity for minimizing the overall video quality degradation. We also consider the proportional rate which is pre-determined for each user. Simulation results show that compared to the previous time division multiple access method and the resource allocation method maximizing data rate, the proposed rate allocation algorithm substantially improves the received video quality.