In this paper we propose a multipath video streaming mechanism based on the scalable video coding (SVC) extension of H.264/AVC. Our method adapts to the heterogeneous capabilities of different end-users. Additionally,...
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This paper presents a new algorithm of scalable video coding base on frequency spectrum. Data partition in MPEG-2 is an early scalable video coding base on spectrum, but it is rough in scalable granularity and low in ...
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In this paper, an efficient spatially scalable video coding scheme with a two-layered architecture is proposed. In this architecture, two spatial layers are referred to as a base layer and an enhancement layer. The ba...
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In this paper, an efficient spatially scalable video coding scheme with a two-layered architecture is proposed. In this architecture, two spatial layers are referred to as a base layer and an enhancement layer. The base layer is coded to be compatible to H.264 standard, and when coding the enhancement layer, a new inter layer intra coding method (ILICM) is used to improve the coding efficiency. ILICM intends to use a few specific pixels in the up-sampled and decoded base layer block to predict the corresponding block in enhancement layer, when those original predictors are not available. Besides, in order to interpolate the base layer data, a graceful component-based up-sampling method (CUSM) is also introduced in this paper. Based on the human vision system, CUSM assigns a much simpler up-sampling filter for the chroma component due to its lower sensitivity for human eyes. Generally, proposed schemes including ILICM and CUSM are expected to increase the coding performance of enhancement layer and reduce the computing complexity of the decoder, respectively. Experimental results show that, the PSNR values of luma component of encoded frames are increased with no additional cost on coded bit-rate for ILICM method, while CUSM method can also maintain the coding performance under the theoretically significant reduction of computational complexity.
Many researches on peer-to-peer video streaming have focused on dealing with highly dynamic, high-churn P2P environment. Most of P2P streaming protocols were modified from a P2P file sharing protocol. Inspired by the ...
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Many researches on peer-to-peer video streaming have focused on dealing with highly dynamic, high-churn P2P environment. Most of P2P streaming protocols were modified from a P2P file sharing protocol. Inspired by the high performance on peer-to-peer file sharing of BitTorrent, we propose an overlaying streaming mechanism on the native BitTorrent protocol and realize a practical P2P video streaming service, called WuKong. WuKong not only takes advantages of BitTorrent but also combines the video scalability of layered videocoding. In this paper, we depict an overlaid streaming mechanism in WuKong and an adaptive layer-downloading process to balance between the video quality and bandwidth utilization on heterogeneous peers. WuKong is carried out by using an open-sourced library of the BitTorrent protocol, coding schemes of the Windows Media video (WMV), and the scalable video coding (SVC). We measured and compared the service quality of end-users served by WuKong on heterogeneous peers. In addition, we evaluated the effectiveness of WuKong with peers that are randomly joining and leaving the P2P network. The results show that WuKong not only provides high quality P2P video streaming services but also supports different scaling abilities over heterogeneous devices.
Recent advances in forward error correction and scalable video coding enable new approaches for robust, distributed streaming in Mobile Ad Hoc Networks (MANETs). This paper presents an approach for distribution of rea...
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Recent advances in forward error correction and scalable video coding enable new approaches for robust, distributed streaming in Mobile Ad Hoc Networks (MANETs). This paper presents an approach for distribution of real time video by uncoordinated peer-to-peer relay or source nodes in an overlay network on top of a MANET. The approach proposed here allows for distributed, rate-distortion optimized transmission-rate allocation for competing scalablevideo streams at relay nodes in the overlay network. The approach has the desirable feature of path/source diversity that can be used for enhancing reliability in connectivity to serving nodes and/or attaining a higher throughput. The distributed approach reduces signaling overhead as well as avoiding scalability issues that come with centralized processing in MANETs. Results show a significant performance gain over both single-server systems and previously proposed multi-source systems. (C) 2008 Elsevier Inc. All rights reserved.
scalable video coding is an H.264/AVC scalable extension that is used to provide various network-friendly scalability using a single bit stream. In SVC, the newly adapted predictive coding techniques can achieve high ...
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scalable video coding is an H.264/AVC scalable extension that is used to provide various network-friendly scalability using a single bit stream. In SVC, the newly adapted predictive coding techniques can achieve high encoding efficiency, but they increase the computational complexity. To reduce the computational complexity, we present a fast mode decision algorithm based on the block complexity function considering the degree of correlation between base layer and enhancement layer. The simulation results show that the encoding time of the proposed fast mode decision algorithm for the combined scalability is about 54.72% compared with normal method although the loss of visual quality is negligible(1).
We address the problem of enhancement layer drift estimation for fine granular scalablevideo. An optimal per-pixel drift estimation algorithm is introduced. The encoder assumes that there is some truncation of the en...
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We address the problem of enhancement layer drift estimation for fine granular scalablevideo. An optimal per-pixel drift estimation algorithm is introduced. The encoder assumes that there is some truncation of the enhancement layer, which does not allow the enhancement layer reference to be properly reconstructed, and the encoder recursively estimates the associated drift and chooses coding modes accordingly. The approach yields performance gains of about 1 dB across low to medium rates. In addition, we investigate dual frame prediction, for both base and enhancement layer, with pulsed-quality allocation in the base layer.
In the emerging international standard for scalable video coding (SVC) as an extension of H. 264/AVC, a computationally expensive exhaustive mode decision is employed to select the best prediction mode for each macrob...
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In the emerging international standard for scalable video coding (SVC) as an extension of H. 264/AVC, a computationally expensive exhaustive mode decision is employed to select the best prediction mode for each macroblock (MB). Although this technique achieves the highest possible coding efficiency, it results in extremely large computation complexity, which obstructs SVC from the practical application. We propose a fast mode decision algorithm for SVC, comprising two fast mode decision techniques: early SKIP mode decision and adaptive early termination for mode decision. They make use of the coding information of spatial neighboring MBs in the same frame and neighboring MBs from base layer to early terminate the mode decision procedure. Experimental results show that the proposed fast mode decision algorithm can achieve the average computational savings of about 70% with almost no loss of rate distortion performance in the enhancement layer. (C) 2010 SPIE and IS&T. [DOI: 10.1117/1.3478882]
This paper presents a fast mode decision to accelerate the encoding process of scalable video coding (SVC) through coded block pattern (CBP) analysis. CBP contains residual information of each macroblock (MB) and prov...
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This paper presents a fast mode decision to accelerate the encoding process of scalable video coding (SVC) through coded block pattern (CBP) analysis. CBP contains residual information of each macroblock (MB) and provide cues for mode prediction in encoding process. The proposed algorithm makes use of the existing mode information in base layer (BL), enhancement layer (EL) and CBP to remove invalid modes for the mode prediction of the current MB in EL coding. Also, the EL's modes in the highest temporal level of a group of picture are determined by high correlation exists in adjacent frames. Experimental results show that the proposed algorithm saves an average of 68% of EL motion estimation time with minor degradation in PSNR and with few bitrate increase of SVC quality and spatial scalabilities when compared to JSVM 9.19.14. Our algorithm outperforms the best-known method by 17% EL motion estimation time saving in average. (c) 2012 Elsevier Inc. All rights reserved.
In this paper, a new fast encoding algorithm based on an efficient motion estimation (ME) process is proposed to accelerate the encoding speed of the scalable video coding standard. Through analysis of the ME process ...
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In this paper, a new fast encoding algorithm based on an efficient motion estimation (ME) process is proposed to accelerate the encoding speed of the scalable video coding standard. Through analysis of the ME process performed in the enhancement layer, we discovered that there are redundant MEs and some MEs can simply be unified at the fully overlapped search range (FOSR). In order to make the unified ME more efficient, we theoretically derive a skip criterion to determine whether the computation of rate-distortion cost can be omitted. In the proposed algorithm, the unnecessary MEs are removed and a unified ME with the skip criterion is applied in the FOSR. Simulation results show that the proposed algorithm achieves computational savings of approximately 46% without coding performance degradation when compared with the original SVC encoder.
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