• Title/Summary/Keyword: 스케일러블 코딩

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Scalable Video Coding with Low Complex Wavelet Transform (공간 웨이블릿 변환의 복잡도를 줄인 스케일러블 비디오 코딩에 관한 연구)

  • Park, Seong-Ho;Kim, Won-Ha;Jeong, Se-Yoon
    • Proceedings of the KIEE Conference
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    • 2004.11c
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    • pp.298-300
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    • 2004
  • In the decoding process of interframe wavelet coding, the inverse wavelet transform requires huge computational complexity. However, the decoder may need to be used in various devices such as PDAs, notebooks, PCs or set-top Boxes. Therefore, the decoder's complexity should be adapted to the processor's computational power. A decoder designed in accordance with the processor's computational power would provide optimal services for such devices. So, it is natural that the complexity scalability and the low complexity codec are also listed in the requirements for scalable video coding. In this contribution, we develop a method of controlling and lowering the complexity of the spatial wavelet transform while sustaining almost the same coding efficiency as the conventional spatial wavelet transform. In addition, the proposed method may alleviate the ringing effect for certain video data.

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Optimal reference picture selection method in the combined codec of Multi-view HEVC and SHVC (MV-HEVC 와 SHVC 로 구성된 통합코덱에서 최적의 참조영상 선택방법)

  • Lee, Jae-Yung;Kang, Jung-Won;Lee, Ha-Hyun;Lee, Jin-ho;Han, Jong-Ki
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 2014.11a
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    • pp.101-104
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    • 2014
  • 실감형 디스플레이 장치들을 지원하기 위해 다시점 영상을 효율적으로 코딩하는 방법은 다시점 비디오 코딩 방법과 다양한 전송 환경과 다양한 종류의 단말들을 통합적으로 지원할 수 있는 스케일러블 비디오 코딩 방법은 존재하지만, 현재 유비쿼터스 환경에서 실감형 서비스를 지원하면서 동시에 다양한 환경을 지원할 수 있는 통합된 동영상 정보를 생성하는 방법은 존재하지 않는다. 따라서 본 논문에서는 통합된 동영상 정보를 생성하는 다중 확장 비디오 코딩의 개념과 동작에 대해 설명하고 최적의 inter layer 참조 영상 선택 방법에 대해 분석한다.

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Fast Mode Decision Algorithm for Scalable Video Coding (SVC) Using Directional Information of Neighboring Layer (스케일러블 비디오 코딩에서 방향성 정보를 이용한 모드 결정 고속화 기법)

  • Jung, Hyun-Ki;Hong, Kwang-Soo;Kim, Byung-Gyu;Kim, Chang-Ki;Yoo, Jeong-Ju
    • Journal of Broadcast Engineering
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    • v.17 no.1
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    • pp.108-121
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    • 2012
  • As Scalable Video Coding (SVC) is a video compression standard extended from H.264/AVC, it is a way to provide scalability in terms of temporal, spatial and quality. Although the compression efficiency of SVC is increased due to the scalability in many aspect, it is essential to reduce the complexity in order to efficiently use because the complexity is relatively increased. To reduce the complexity of SVC in the paper, we propose fast mode decision algorithm to reduce the complexity of encoding process using direction information of B-picture by efficiently performing inter-layer prediction. The proposed algorithm is a fast mode decision algorithm that makes different from detection mode number of forward and backward, bi-direction in the way using best mode of base-layer up-sampled after simply SKIP mode detection using the direction information of best mode of base-layer up-sampled. The experimental results show that the proposed algorithm approach can achieve the maximum computational time saving about 53% with almost no loss of rate distortion (RD) performance in the enhancement layer.

Media Adaptation System for Contents Service Environments Using Scalable Video Coding (스케일러블 비디오 코딩을 이용한 환경적응형 미디어 시스템)

  • Bae, Seong-Jun;Jung, Soon-heung;Kang, Jung-won;Yoo, Jeong-Ju
    • IEMEK Journal of Embedded Systems and Applications
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    • v.3 no.4
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    • pp.175-181
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    • 2008
  • This paper describes the SVC-based media adaptation system which can adapt video contents optimally to various consumption environments in an IP-based transmission scenario. As key technologies, we will present scalable video coding, SVC-based adaptive media transmission, and SVC-based adaptation signaling technology.

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A Study on Adaptive GOP Structure for SVC (스케일러블 동영상 부호화를 위한 적응적 GOP 구조에 관한 연구)

  • Jeong, Se-Yoon;Park, Min-Woo;Park, Gwang-Hoon;Kim, Kyeu-Heon;Hong, Jin-Woo
    • Journal of Broadcast Engineering
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    • v.10 no.4 s.29
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    • pp.463-473
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    • 2005
  • In this paper, we propose Adaptive GOP Structure to enhance the coding performance of scalable video coding in JVT. Adaptive GOP Structure considers temporal variances of video sequence. In general, SVC encodes a video sequence with fixed GOP size. The coding performance is varying according to the temporal variance of a video sequence. Thus, Adaptive GOP Structure method is proposed. It selects GOP size adaptively by considering temporal variance of video sequence. In the experiments, the propose method showed the enhanced coding performance in most sequences. The PSNR gain of Crew sequence is up to 0.63 dB.

Method of scalable video application in the advanced T-DMB (지상파 DMB 고도화 망에서의 스케일러블 비디오 부호화 기술)

  • Jun, Dong-San;Kwak, Sang-Min;Lim, Hyung-Soo;Choi, Hae-Chul;Kim, Jae-Gon;Lim, Jong-Soo;Hong, Jin-Woo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.44 no.1
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    • pp.1-9
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    • 2007
  • Digital Multimedia Broadcasting is the next generation broadcasting service which enables various digital multimedia contents, i.e., audio and video, and data access for mobile users. However, due to the bandwidth limitation, the spatial resolution is limited to CIF(Common Interleaved Frame). The Advanced Terrestrial DMB (AT-DMB) secures additional bandwidth by adopting hierarchical modulation transmission technology and provides high data rate and quality for mobile multimedia broadcasting services with scalable video coding(SVC). This paper proposes scalable video coding technology for AT-DMB which enables high quality mobile multimedia broadcasting services that exceeds current DMB service's quality and contents capability.

Media-aware and Quality-guaranteed Rate Adaptation Algorithm for Scalable Video Streaming (미디어 특성과 네트워크 상태에 적응적인 스케일러블 비디오 스트리밍 기법에 관한 연구)

  • Jung, Young-H.;Kang, Young-Wook;Choe, Yoon-Sik
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.34 no.5B
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    • pp.517-525
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    • 2009
  • We propose a quality guaranteed scalable video streaming service over the Internet using a new rate adaptation algorithm. Because video data requires much more bandwidth rather than other types of service, therefore, quality of video streaming service should be guaranteed while providing friendliness with other service flows over the Internet. To successfully provide this, we propose a framework for providing quality-guaranteed streaming service using two-channel transport layer and rate adaptation of scalable video stream. In this framework, baseline layer for scalable video is transmitted using TCP transport for minimum qualify service. Enhancement layers are delivered using TFRC transport with layer adaptation algorithm. The proposed framework jointly uses the status of playout buffer in the client and the encoding rate of layers in media contents. Therefore, the proposed algorithm can remarkably guarantee minimum quality of streaming service rather than conventional approaches regardless of network congestion and the encoding rate variation of media content.

Development of Hierarchical Media Processing for High Quality AT-DMB Service (고품질 AT-DMB 서비스를 위한 계층적 미디어 처리용 시뮬레이터 개발)

  • Jun, Do-Young;Kim, Min-Sung;Jang, Seung-Min;You, Hong-Yeon;Hong, Sung-Hoon
    • Proceedings of the KIEE Conference
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    • 2008.04a
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    • pp.86-88
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    • 2008
  • 지상파 방송(DMB: Digital Multimedia Broadcasting)은 음성, 영상, 데이터와 같은 다양한 멀티미디어 신호를 디지털 방식으로 변조하여 이동 중에 방송을 청취 할 수 있는 차세대 디지털방송 서비스이다. 하지만 한정된 대역폭으로 인한 비디오 전송율의 한계에 따라 최대 CIF(Common Interleaved Frame)급 화면해상도까지 서비스가 가능하다. 그러나 지상파 DMB 전송 고도화망에서는 계층 변조(Hierarchical Modulation)전송 기법을 통하여 추가의 전송대역폭을 확보할 수 있다. 또한 스케일러블 비디오 코딩(Scalable Video Coding)부호화 방식을 이용하여 고전송효율/고품질의 이동 멀티미디어 방송서비스를 제공할 수 있는 고품질 AT(Advanced Terrestrial)-DMB 시스템이 가능하다. 이러한 고품질 AT-DMB의 개발에 있어서 여러 방식들이 제시됨에 따라 시뮬레이터를 통한 다중화 시스템의 분석이 필요하다. 본 논문에서는 고품질 AT-DMB가 가능한 스케일러블 비디오 방식을 JM8.8을 사용하여 구현하였으며, 다중화 시스템의 실험을 하였다. 또한 시뮬레이터를 통하여 확보된 계층 간의 화질 차이와 엔지니어를 위해 비트스트림의 분석화면 및 PSNR을 제공 하였다.

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Overview of H.264/AVC Scalable Extension (H.264/AVC-Scalable Extension의 표준화 연구동향과 알고리즘 분석)

  • Park Seong-ho;Kim Wonha;Han Woo-jin
    • Journal of Broadcast Engineering
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    • v.10 no.4 s.29
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    • pp.515-527
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    • 2005
  • A next-generation codec should be developed to be a scalable video codec(SVC) that not only maximizes the coding efficiency but also adaptively copes with the various communication devices and the variation of network environments. To meet these requirements, Joint Video Team (JVT) of ISO/IEC and ITU-T is standardizing H.264/AVC based SVC. In this paper, we introduce research directions and status on SVC standardization and also analyze techniques and algorithms adopted in the current SVC.