共查询到19条相似文献,搜索用时 78 毫秒
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给出基于TMS320DM642实验平台的MPEG-4网络实时编码实现方法,阐述了系统实现结构框图,在分析DM642特点的基础上,讨论了网络视频编码器的实现和优化策略,并给出了较好的实验结果。 相似文献
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MPEG-4标准及其采用的视频技术 总被引:2,自引:0,他引:2
MPEG-4是关于对数字音/视频数据进行压缩、通信、存取和操作管理等新方法的标准,并为各种通信环境提供一种通用的技术解决方案。文章阐述MPEG-4的基本标准和视频技术。 相似文献
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基于对象的视频编码方法——MPEG-4 总被引:1,自引:0,他引:1
介绍了MPEG-4的各种编码方法,为了支持众多的多媒体应用,MPEG-4不仅保留了现有标准中的一些解决方案,而且致力于一些新功能的研究与定义,MPEG-4视频编码标准支持MPEG-1,MPEG-2中的大多数功能,提供不同视频标准源格式、码率、帧频下矩形图像的有效编码,同时也将支持基于内容的图像编码。 相似文献
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MPEG-4视频标准及其关键算法 总被引:3,自引:0,他引:3
MPEG-4引入了视频对象的概念,有效地支持基于内容的图像编码,对不同的视频源标准格式和不同的视频码率提供有效的编码,以满足众多多媒体的应用需求。本文系统地分析了MPEG-4视频编码算法,对MPEG-4视频标准的关键概念进行了详细的解释。 相似文献
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本丈阐述了MPEG-2解码器关键模块——运动补偿的原理及硬件实现,并讨论了其中的几个技术难点。 相似文献
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本文详细介绍了MPEG-4网络视频编码器的视频采集、传输和系统控制等方面的硬件设计方案,以及基于Vxworks的软件实现方法。 相似文献
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详细地分析了双基预测算法的实现过程及其优越之处,同时给出了一种切实可行的编码算法,产生了个符合MPEG-2语义的视频流。 相似文献
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介绍基于SIMD阵列处理机系统的1920×1152格式HDTV实现方法:先将1920×在152的HDTV画面划分6个1920×192的水平状子画面,由6个子编码器并行编码,最后将6路码流合成为高清晰度电视码流。为了较彻底地解决边界效应问题,,子图像重建质量均衡策略包括:(1)过界运动估计/运动补偿,(2)码率分配和量化控制策略。 相似文献
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MPEG-4自然视频编码技术 总被引:1,自引:0,他引:1
对MPEG-4自然视频编码的关键技术作了详细的分析和阐述。首先介绍MPEG-4频语法结构,并对视频编码的框架概要分析。接着分析了自然视频编码中涉及到的关键技术,包括:VOP的产生;二值和灰度级α平面的编码技术;运动估计和补偿方法;纹理编码;基于对象的时间分级和空间分级;MPEG-4提供的再同步和各种错误掩盖,刷新方法,精 编码技术和零树小波基的静止图像编码技术。指出MPEG-4和MPEG-1,MPEG-2等标准的异同,突出MPEG-4的三个主要特点。最后给出MPEG-4技术在网络视频传输中的应用,并给出测试和分析。 相似文献
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RATE CONTROL ALGORITHM FOR H.264 VIDEO ENCODER 总被引:1,自引:0,他引:1
Xue Jinzhu Shen Lansun 《电子科学学刊(英文版)》2003,20(6):456-460
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运动估计是MPEG图像编码中提高压缩率最有效的方法,也是运算量最大的部分,因而也是较难实时实现的。针对“高清晰度电视功能样机”信源编码的要求,就全局运动做主方法提出了相应的硬件设计,并且完成了其硬件实现。 相似文献
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Joumana Farah Ralph Mounzer 《AEUE-International Journal of Electronics and Communications》2010,64(11):1046-1054
In this paper, we tackle the problem of motion estimation in video compression. Since Full Search Algorithms (FSA) present the disadvantage of adding a high computational burden to the encoder, fast search techniques have been used in conjunction with predictive filtering, in such a way to guarantee an acceptable quality with an affordable complexity. The aim of this work is to propose a novel framework for Kalman filtering of motion information in compressed video sequences. The merits of our new framework are twofold: First, using an appropriate formulation of the system equations, several shortcomings inherent with former models in the literature are greatly counteracted. Secondly, it is constructed using a generalized structure in such a way to enclose a large variety of prediction models. Therefore, it can adapt to different types of motion activities in video sequences, without the need for a different formulation in each prediction model, as was the case in previous studies. Furthermore, we propose an adaptive motion compensation technique that permits an additional improvement to the decoded video quality. Our framework permits a considerable gain in the average performance compared to previous models and even to the FSA technique. 相似文献
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Zhenzhong Chen King N. Ngan Chengji Zhao 《Signal Processing: Image Communication》2003,18(10):879-887
Video streaming over wireless channel is challenging due to a number of factors such as limited bandwidth and loss sensitivity. In this paper, we develop a novel rate control algorithm for MPEG-4 video coding. Unlike traditional rate control schemes, we jointly consider the encoding complexity variation and buffer variation as well as human visual properties to optimize the rate control efficiency. We also analyze the sensitivity of a macroblock (MB) as a result of bit errors and calculate its error sensitivity metric. This metric is used in unequal error protection of the MB. Simulation results show that proposed approach can improve the decoded picture quality in wireless video coding and transmission. 相似文献
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Van der Werf A. Bruls F. Kleihorst R.P. Waterlander E. Verstraelen M.J.W. Friedrich T. 《Solid-State Circuits, IEEE Journal of》1997,32(11):1817-1823
I.McIC is a single-chip MPEG-2 video encoder for consumer storage applications. It supports both intra- and inter-coding mode to achieve bit rates from 5-15 Mb/s. It contains a recursive motion estimator, a programmable buffer/bit-rate controller, and a temporal noise-reduction stage. The resulting IC has 4.5×106 transistors and measures 192 mm2 in a 0.5-μm process. I.McIC was designed using mainly high-level synthesis tools. High-throughput fixed MPEG functions are performed by dedicated hardware. The remainder is performed in software by an embedded application-specific instruction-set processor with downloadable microcode to suit the IC for different applications of video coding 相似文献