H.264的视频编码技术解析

H．264是新一代视频编码标准。本文分析了H．264的分层结构和主要编码技术，探讨了其在性能改进方面的研究成果，并展望了其在多个领域中的应用前景。     

一种HEVC帧内模式选择的快速算法

HEVC是ITU-T和ISO联合制定的新一代视频编码标准。由于采用了许多新的技术,HEVC的编码效率是H.264标准的大约2倍,但是编码的复杂度也随之增加。提出了一种针对HEVC帧内预测模式选择的快速算法,该方法综合了基于视频内容分析的方法和基于统计信息的方法并加以优化。实验结果表明,在比特率和PSNR几乎不变的情况下,编码时间平均可以减少30%。     

基于新一代视频压缩编码标准H．264的研究

H.264是ITU-T的视频编码专家组(VCEG)和ISO/IEC的活动图像编码专家组(MPEG)联合开发的一个最新的视频编码标准。对H.264标准的技术特点进行概要介绍,并阐述了它在数字电视、高清晰度电视以及移动通信等方面的应用前景。     

基于分布式视频编码的WMSN节点能耗

分布式视频编码(DVC)是一种编码简单、解码复杂的视频编码方案,适用于计算能力与能量受限的WMSN节点。分析了目前性能较好的DISCOVER DVC方案以及视频传感器节点的能耗模型,研究分布式视频编码方案的对节点数据处理和传输能耗的影响。通过实验仿真的方式对比H.264帧内编码方案与DVC方案,分析H.264帧内编码视频编码方案和DISCOVER DVC方案在节点数据处理和传输方面的能耗特点。实验结果表明,与H.264帧内编码方案相比,DISCOVER DVC方案可以降低视频传感器节点的能耗。     

基于SSE技术的H．264运动估计的并行处理

H．264标准是ITU—T视频编码专家组（VcEG）和ISO／IECMPEG委员会正在制定的用于视频通信的新一代视频编码标准。运动估计是H．264最关键技术，占计算量的主要部分，因而成为视频压缩处理的瓶颈，因此必须研究运动估计的并行处理算法。通过介绍SSE技术的特点、数据结构和内联函数，在此基础上用SSE技术实现了运动估计并行算法。     

基于宏块划分的视频水印算法

研究一种针对H.264编码的帧间预测块划分视频水印算法,该算法先对水印图像进行二值处理,然后在H.264帧间预测编码时根据水印二值序列选择不同的区块划分,并将水印值嵌入进去.实验结果表明,该算法具有较好的实时性、鲁棒性.     

面向网络的立体视频编码和传输技术研究

立体视频和传统的单通道视频相比,要处理翻番的数据量,为了便于存储和传输,立体视频数据必须要进行高效的压缩．本文首先介绍了数字视频压缩技术的基本知识,包括视频压缩的基本原理以及国内外流行的视频编码标准,并对H．264标准进行了详细介绍．进而提出了一种基于H．264的立体视频编码框架,并分析了立体视频流式传输的要求,提出了适合立体视频流式传输的相关技术．     

多视点视频编码预测结构的研究

不同的多视点视频序列具有不同的时空相关性,MVC采用的分层B帧预测结构无法充分利用视频序列的属性。本文提出了一种能适应不同视频序列编码的方法,通过研究多视点视频图像中的时空相关性和视点间的相关性,适当地取消部分时间层的视点间预测并且对所有P视点的非关键帧均采用视点间预测和调整了I视点的位置。实验结果表明,本文方法在提高编码效率的同时使得预测结构具有更好的随机访问性能、更低的编码复杂度。     

基于帧内/帧间模式选择相关性的H.264/AVC快速帧内模式选择算法

对高清视频序列而言,H.264/AVC视频编码器性能优异,但同时其计算复杂度也较高。帧间和帧内预测模式的选择是H.264/AVC待优化的主要技术。鉴于此,根据选定的帧间预测模式和帧内模式选择之间存在的相关性,提出了基于最佳帧间预测模式的H.264高清基本档次编码器的快速帧内模式选择算法。对该算法的评估是基于率失真、峰值信噪比(PSNR)的改变量、执行时间以及所跳过的intra4×4和intra16×16模式占全搜索算法的百分比进行的。经720p(1280×720)和1080p(1920×1088)高清视频序列测试,在不损失PSNR、不增加码率的前提下,该算法能节省60%的帧内预测计算时间,并对16×16宏块和4×4子块帧捏模式选择部分的跳过率分别达到了16%和83%。     

基于小波域的DVC到HEVC快速转码研究

分布式视频编码是一种编码端复杂度低、解码端复杂度高的新型视频编码技术,HEVC则是编码端复杂度高、解码端复杂度低的新一代视频编码标准。通过视频转码技术将分布式视频编码和HEVC中高复杂度的运算转移到转码器,可实现一种编、解码都简单的视频编码框架。同时,针对在转码过程中需要对重建的视频帧进行HEVC重编码,提出利用分布式视频的关键帧解码生成WZ帧的编码单元四叉树划分,以降低分布式视频编码到HEVC转码的复杂度。实验结果表明,该转码方案与级联转码方案相比,在几乎不降低视频质量的前提下,极大地降低了转码计算复杂度和时间,提高了转码效率。     

Multiple description scalable video coding based on 3D lifted wavelet transform

INTRODUCTION With the expansion of multimedia applications, video transmission is becoming an important issue in the research area of communication. It is very im- portant to compress a large amount of video data effectively, which has already attracted considerable attention recently. To make source coders both er- ror-resilient and network-adaptive are two main challenges facing the video compression techniques. It is necessary to make the bitstreams temporal, spa- tial and SNR scalabl…     

Multipoint videoconferencing with scalable video coding

INTRODUCTION Modern videoconferencing systems allow two o more participants to communicate with each other in real-time using both audio and video. Conventionally when more than two participants are present, a sta configuration is generally employed, wherein a Mul tipoint Conferencing Unit (MCU), or bridge, is util ized to connect to all participants and coordinat communications between them. The general archi tecture is shown in Fig.1. Fig.1 Multipoint videoconferencing system Network…     

Multiple description coding with spatial-temporal hybrid interpolation for video streaming in peer-to-peer networks

INTRODUCTION Multimedia services over the Internet are be- coming popular due to the widespread deployment of broadband access. However, the conventional cli- ent-server architecture severely limits the number of simultaneous users, especially for bandwidth inten- sive applications such as video streaming. P2P net- works, on the other hand, offer a solution to the scalability problem. As a node joins a P2P network, it not only consumes resources but also contributes its bandwidth or comp…     

Very low bit-rate video coding based on wavelet transform

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An adaptive joint source and channel coding scheme for H.264 video multicasting over wireless LAN

INTRODUCTION Video multicasting over wireless local area net- work (WLAN) (IEEE Standard 802.11, 1997) enables the distribution of live or pre-recorded programs to many receivers efficiently. An example application is to redistribute TV programs or location-specific in- formation in hot spots such as airport. Users can watch their favorite TV programs on mobile devices while browsing the Internet. For enterprise applica- tions, an example is multicasting video of a lecture or trainin…     

RTP payload format for H.264/SVC scalable video coding

The scalable extension of H.264/AVC, known as scalable video coding or SVC, is currently the main focus of the Joint Video Team‘s work. In its present working draft, the higher level syntax of SVC follows the design principles of H.264/AVC.Self-contained network abstraction layer units (NAL units) form natural entities for packetization. The SVC specification is by no means finalized yet, but nevertheless the work towards an optimized RTP payload format has already started. RFC 3984, the RTP payload specification for H.264/AVC has been taken as a starting point, but it became quickly clear that the scalable features of SVC require adaptation in at least the areas of capability/operation point signaling and documentation of the extended NAL unit header. This paper first gives an overview of the history of scalable video coding, and then reviews the video coding layer (VCL)and NAL of the latest SVC draft specification. Finally, it discusses different aspects of the draft SVC RTP payload format, including the design criteria, use cases, signaling and payload structure.     

Edge-oriented compression coding on image sequence

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A parallel memory architecture for video coding

To efficiently exploit the performance of single instruction multiple data （SIMD） architectures for video coding, a parallel memory architecture with power-of-two memory modules is proposed. It employs two novel skewing schemes to provide conflict-free access to adjacent elements （8-bit and 16-bit data types） or with power-of-two intervals in both horizontal and vertical directions, which were not possible in previous parallel memory architectures. Area consumptions and delay estimations are given respectively with 4, 8 and 16 memory modules. Under a 0.18-pm CMOS technology, the synthesis results show that the proposed system can achieve 230 MHz clock frequency with 16 memory modules at the cost of 19k gates when read and write latencies are 3 and 2 clock cycles, respectively. We implement the proposed parallel memory architecture on a video signal processor （VSP）. The results show that VSP enhanced with the proposed architecture achieves 1.28× speedups for H.264 real-time decoding.     

基于JND和AR模型的感知视频编码方法(英文)

为了达到减少比特数同时保持画面质量的目的,提出了一种基于最小可视失真(JND)和自回归(AR)模型的感知视频编码方法.首先,设计了基于JND的纹理分割算法,建立了空时JND模型,以MB为基本单元,通过计算其JND能量并与阈值做比较,用以分割出视频序列中的纹理区域.然后,开发了AR模型来合成纹理区,在使用最小二乘法计算出AR模型的参数后,用相邻的前后参考帧对应像素的线性插值来生成重构像素.最后,为了检验所提方法的效果,将其与H.264/AVC视频编码系统做比较,用不同的视频序列实验来验证所提方法的有效性.实验结果显示,对于具有不同纹理特点的实验序列,所提方法可以在保持感知质量的同时将比特率减少15%～58%.