Streaming media is important in modern information consumption industry. However the limited and varied computing resources and bandwidth of client devices pose challenges for videocoding. To make a balance between s...
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This paper proposes a new joint random caching and hierarchical transmission scheme for delivering multimedia content in cache-assisted heterogeneous networks. We use scalable video coding (SVC) and wireless edge cach...
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scalablevideo compression is a crucial task that allows for high flexibility of video streams to different networks in various applications. Current videocoding techniques exploit temporal correlation using motion-c...
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scalablevideo compression is a crucial task that allows for high flexibility of video streams to different networks in various applications. Current videocoding techniques exploit temporal correlation using motion-compensated predictive or filtering approaches. Particularly, motion-compensated temporal filtering (MCTF) is a useful framework for scalablevideo compression schemes. In this paper, we propose a new scalable video coding method that combines open-loop motion-compensated prediction with an embedded intra-band wavelet based compression. Our major objective is to provide a wavelet based videocoding system that circumvents the drawbacks of conventional closed-loop prediction systems, without sacrificing compression performance. To improve the coding efficiency, we adaptively weight the target bitrate according to the temporal frame position in the temporal pyramid. Comparisons with state-of-the-art scalable video coding solutions confirm an overall coding efficiency gain of the proposed method specially at high bitrates.
videocoding using compressive video sensing exhibits many characteristics that are desirable for transmission in a video network. In particular, the coded video is inherently scalable with channel capacity, decoding ...
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videocoding using compressive video sensing exhibits many characteristics that are desirable for transmission in a video network. In particular, the coded video is inherently scalable with channel capacity, decoding complexity, display resolution, and quality. In this paper, we present compressive video sensing methods and demonstrate video scalability with such properties as graceful degradation, multi-resolution decoding.(c) 2012 Alcatel-Lucent.
scalable video coding (SVC) allows an encoded bitstream to be brought down in scale or quality without the need for further processing. This study presents a wavelet-based motion-compensated system for SVC. The motion...
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scalable video coding (SVC) allows an encoded bitstream to be brought down in scale or quality without the need for further processing. This study presents a wavelet-based motion-compensated system for SVC. The motion vectors are encoded in a scalable manner that employs a palette of motion vectors split into layers, which gives good scalability and low bit rates. The algorithms were designed to keep the complexity and memory requirements low, making the system suitable for hardware implementation. Experimental results show that the compression performance of the proposed system compares well with the joint scalablevideo model reference software for scalablevideo extension to H.264/AVC, while providing a finer and larger range of quality scalability.
In order to provide end users with better quality video, this paper presents an adaptive multipath video stream scalable video coding algorithm, which is based on the cloud computing for H264/AVC extension, with the p...
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With the emergence of broadband wireless networks and increasing demand of multimedia information on the Internet, wireless multimedia services are foreseen to become widely deployed in the next decade. Real-time vide...
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With the emergence of broadband wireless networks and increasing demand of multimedia information on the Internet, wireless multimedia services are foreseen to become widely deployed in the next decade. Real-time video transmission typically has requirements requirements on quality service (QoS). However, wireless channels are unreliable and the channel bandwidth varies with time, which may cause severe degradation to video quality In addition,for video multicast, the heterogeneity of receivers makes it difficult to achieve efficiency and flexibility To address these issues, three techniques, namely, scalable video coding, network-aware adaptation of end systems, and adaptive QoS support from networks, have been developed, This paper unifies the three techniques and presents an adaptive framework, which specifically addresses video transport over wireless networks. The adaptive framework consists of three basic components: 1) scalablevideo representations;2) network-aware end systems;and 3) adaptive services. Under this framework , as wireless channel conditions change, mobile terminals and network elements can scale the video streams and transport the serried video streams to receivers with a smooth change of perceptual quality. The key advantages of the adaptive framework are: 1) perceptual quality is changed gracefully during periods of QoS fluctuations and handoffs;and 2) the resources are shared in a fair manner.
scalable video coding (SVC) is standardized as H.264/AVC Annex G by the Joint video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG. SVC extends the features of its base specification H.264/AVC by flexible scalability featu...
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ISBN:
(纸本)9781424425761
scalable video coding (SVC) is standardized as H.264/AVC Annex G by the Joint video Team (JVT) of ISO/IEC MPEG and ITU-T VCEG. SVC extends the features of its base specification H.264/AVC by flexible scalability features in all directions (temporal, spatial and SNR) while maintaining high compression efficiency. This paper investigates scalable video coding, general transcoding techniques and SVC to H.264/AVC transcoding with emphasis on the conversion of SNR scalability layers in SVC to a single layer H.264/AVC stream.
scalable video coding (SVC) has a great advantage due to its very easy adaptation to unpredictable bandwidth variations and network conditions. However, in some scalable video coding schemes, either a single predictio...
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ISBN:
(纸本)0819459763
scalable video coding (SVC) has a great advantage due to its very easy adaptation to unpredictable bandwidth variations and network conditions. However, in some scalable video coding schemes, either a single prediction is used, which leads to either drift or coding inefficiency, or a different prediction is obtained for each reconstructed version, which leads to add complexity. So, the new techniques have to be developed to improve the performance of the SVC scheme. Wyner-Ziv coding gives us the surprising insight that efficient data compression can also be achieved by exploiting source statistics-partially or wholly-at the decoder only. Based on the Wyner-Ziv framework, Xu and Xiong proposed a Layer Wyner-Ziv scheme (LWZ) by treating a standard coded video as a base layer, and building the bit-plane enhancement layer using Wyner-Ziv coding. The LWZ scheme has error robustness and channel adaptation. However, the coding efficiency gap between the nonscalable video coding and LWZ is very large. The reason is that only the current base layer and lower enhancement layers are used as side information, and the correlation between the temporal adjacent frames isn't utilized. In order to improve the coding efficiency, of LWZ, a scalable video coding based on Wyner-Ziv (SVC-WZ) is proposed in this paper. In our SVC-WZ scheme, we try to use the correlation between temporal adjacent frames rather than always use the correlation between the enhancement layers and the current base layer as SI during the enhancement layer encoding. Using the correlation between temporal adjacent frames would make SI more accurate, thus it could improve the coding efficiency. Our experimental results show that the SVC-WZ scheme can achieve consistently better coding efficiency than the LWZ scheme while keeping all the properties of LWZ.
An overview of a new scalable video coding (SVC) extension of the H.264/AVC standard is given in this paper. A performance analysis is presented for quality and spatial scalability. Influence of the inter-layer predic...
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ISBN:
(纸本)9789537044060
An overview of a new scalable video coding (SVC) extension of the H.264/AVC standard is given in this paper. A performance analysis is presented for quality and spatial scalability. Influence of the inter-layer prediction and the number Of scalable layers to coding efficiency is shown. Results for CGS (coarse-grain quality scalability) and MGS (medium-grain quality scalability) coding are also compared.
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