共查询到18条相似文献,搜索用时 46 毫秒
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对视频编码的 H.2 6 L标准进行简要介绍 ,归纳了 H.2 6 L标准的新特点 ,并分析和研究了 H.2 6 L熵编码的两种方法 ,指出了 H.2 6 L 在多媒体通信中广泛的应用前景 相似文献
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可伸缩视频编码是目前国际上视频技术研究的热点。联合视频组在近年来围绕可伸缩视频编码(SVC)展开了大量的研究工作,提出了作为H.264/AVC扩展集的SVC方案,实现了时域、空域和质量等三个维度上的可伸缩性,而其中基于视频尺寸(空域)的分层是这一方案的基本结构。因此,本文研究了基于H.264/AVC的空域可伸缩编码技术的基本结构和技术要点,并分析了这一技术在流媒体系统中应用所带来的好处。 相似文献
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H.26L是VCEG(视频编码专家组)制定的新的甚低码率图像压缩标准,主要应用于可视电话和网络视频传输。本文讨论了H.26L的编码原理及其相对于H.263视频编码标准的新发展,分析了该标准的优点及实用化遇到的问题。计算机对比实验表明H.26L通过采用1,4精度运动估计、增强的先进帧间预测编码和帧内预测编码.在保证图像质量的情况下,压缩码率有明显改善,但同时运算的复杂度也大大增加。 相似文献
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面向无线视频通信的相关视频编码技术是当前的研究热点,联合视频组正在研究开发的H.264/AVC扩展可伸缩编码可在空间、时间及质量上实现完全可伸缩,其视频码流能更好地适应无线网络环境及用户终端的多样性,克服无线网络易错、时变和带限的特点,提供更好的服务质量。文章详细地阐述了基于H.264/AVC扩展的可伸缩编码的关键技术及原理,并描述了其在无线视频通信中的应用及相关技术。 相似文献
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多屏将是有线/无线宽带的下一个业务大趋势,但要真正实现强调高QoS和QoE(Quality of Experience)的多屏业务,对系统及网络资源的设计、配置增加了不小的压力。本文基于H.264可伸缩编码技术,给出了一套多屏业务高效解决方案,能够在带给用户眩彩多屏业务体验的同时,实现网络资源的高效利用。 相似文献
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Performance of H.26L Video Encoder on General-Purpose Processor 总被引:2,自引:0,他引:2
Ville Lappalainen Antti Hallapuro Timo D. Hämäläinen 《The Journal of VLSI Signal Processing》2003,34(3):239-249
Two optimized implementations of the emerging ITU-T H.26L video encoder are described. The first, medium-optimized version, is implemented in C and the latter, highly optimized version, utilizes both algorithmic and platform-specific optimizations. Comparisons to a correspondingly optimized H.263/H.263+ implementation are given with the spatial and temporal video quality fixed and the bit rate and complexity varied. On a 733 MHz general-purpose processor, an average encoding speed of 17 frames per second for QCIF sequences is achieved with a 29% reduction in bit rate compared to H.263+. The complexity of H.26L is about 3.4 times more than that of H.263+. 相似文献
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分析了H.26L中熵编码的原理和特点,比较了两种不同熵编码方法的优缺点、性能差异和发展方向,提出了一种基于量化参数QP的熵编码改进方法。实验证明这种方法能在信道传输率变化到一定程度时,动态调整熵编码的方法,使H.26L熵编码器在复杂度和编码效率两方面作出合理的权衡。 相似文献
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ZhangJiangshan ZhuGuangxi 《电子科学学刊(英文版)》2003,20(1):38-44
This letter proposes an efficient wavelet-based fine Granularity Scalable(FGS)coding scheme,where the base layer is encoded with a newly designed wavelet-based coder,and the entancement layer is encoded with Progressive Fins Granularity Scalable(PFGS)coding.This algorithm involves multi-frame motion compensationk,rate-distortion optimizing strategy with Lagrangian cost function and context-based adaptive arithmetic coding.In order to improve efficiency of the enhancenent layer coding,an improved motion estimation scheme that uses both information from the base layer and the enhancement layer is also proposed in this letter.The wavelet-based coder significantly improves the coding efficiency of the base layer compared with MPEG-4 ASP(Advanced Simple Profile)and H.26L TML9.The PFGS coding is a significant improvement over MPEG-4 FGS coding at the enhancement layer.Experiments show that single layer coding efficiency gain of the proposed scheme is about 2.0-3.0dB and 0.3-1.0dB higher than that of MPEG-4 ASP and H.26L TML9,respectively.The overall coding efficiency gain of the proposed scheme is about 4.0-5.0dB higher than that of MPEG04 FGS. 相似文献
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Zhang Wang 《International Journal of Electronics》2013,100(5):583-598
Scalable video coding (SVC) is attractive due to the capability of reconstructing lower resolution or lower quality signals from partial bit streams, which allows for simple solutions adaptted to network and terminal capabilities. This article addresses the spatial scalability of SVC and proposes an efficient H.264-based scalable intra coding algorithm. In comparison with precious single layer intra prediction (SLIP) method, the proposed algorithm aims to improve the intra coding performance of the enhancement layer by a new inter layer intra prediction (ILIP) method. The main idea of ILIP is that up-sampled and reconstructed pixels of the base layer are very useful to predict and encode those pixels of the enhancement layer, especially when those neighbouring pixels are not available. Experimental results show that the peak signal to noise ratio (PSNR) data of luminance component of encoded frames are improved, and both bit-rates and computation complexity are maintained very well. For sequence Football, the average increase of PSNR is up to 0.21?dB, while for Foreman and Bus, they are 0.14?dB and 0.17?dB, respectively. 相似文献
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提出一种FGS增强层扫描算法,基本层仍采用H.264编码方式,增强层则采用水环扫描算法来代替栅格扫描算法.由于优先传输感兴趣区域的编码信息,水环扫描算法能明显改善视频图像的主观质量.实验表明,对于特定序列,此算法效果较好. 相似文献