AVCHD高清摄像机及其视频格式

MPEG-4 AVC/H.264是目前最新的国际视频压缩标准,已被确定为下一代影视光盘(Blue-rayDisc)和HD DVD(高清DVD)的视频编码标准之一。简要介绍AVCHD高清摄像机的主要性能指标,重点对MPEG-4 AVC/H.264的特点和应用进行了分析。     

H.264视频压缩关键技术及其应用前景

ISO/IEC和ITU-T联合制定的H.264标准,标志着视频压缩技术的最新进展.H.264视频编码新标准采用一系列最新的压缩技术,提高了压缩率.该文重点介绍了视频编码新标准H.264的关键模块,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.     

H.264,VC-1和AVS视频编码研究

从编码结构、核心技术和编码性能等方面对H．264,VC-1和AVS标准进行了研究分析,并综合比较了各个编码技术标准的特点,为应用视频压缩编码标准提供了依据。     

A Very High Throughput Deblocking Filter for H.264/AVC

This paper presents a novel hardware architecture for the real-time high-throughput implementation of the adaptive deblocking filtering process specified by the H.264/AVC video coding standard. A parallel filtering order of six units is proposed according to the H.264/AVC standard. With a parallel filtering order (fully compliant with H.264/AVC) and a dedicated data arrangement in local memory banks, the proposed architecture can process filtering operations for one macroblock with less filtering cycles than previously proposed approaches. Whereas, filtering efficiency is improved due to a novel computation scheduling and a dedicated architecture composed of six filtering cores. It can be used either into the decoder or the encoder as a hardware accelerator for the processor or can be embedded into a full-hardware codec. This developed Intellectual Property block-based on the proposed architecture supports multiple and high definition processing flows in real time. While working at clock frequency of 150 MHz, synthesized under 65 nm low power and low voltage CMOS standard cell technology, it easily meets the throughput requirements for 4 k video at 30 fps of all the levels in H.264/AVC video coding standard and consumes 25.08 Kgates.     

Mode-Dependent Templates and Scan Order for H.264/AVC-Based Intra Lossless Coding

In H.264/advanced video coding (AVC), lossless coding and lossy coding share the same entropy coding module. However, the entropy coders in the H.264/AVC standard were original designed for lossy video coding and do not yield adequate performance for lossless video coding. In this paper, we analyze the problem with the current lossless coding scheme and propose a mode-dependent template (MD-template) based method for intra lossless coding. By exploring the statistical redundancy of the prediction residual in the H.264/AVC intra prediction modes, more zero coefficients are generated. By designing a new scan order for each MD-template, the scanned coefficients sequence fits the H.264/AVC entropy coders better. A fast implementation algorithm is also designed. With little computation increase, experimental results confirm that the proposed fast algorithm achieves about 7.2% bit saving compared with the current H.264/AVC fidelity range extensions high profile.     

H.264编码技术和发展趋势

自2003年推出H．264视音频编解码标准以来，H．264迅速在Internet网和视音频领域得到普及与推广。阐述H．264的定义、H．264编码技术的主要特点与改进及其应用前景和发展趋势。     

The H.264/MPEG4 advanced video coding standard and its applications

H.264/MPEG4-AVC is the latest video coding standard of the ITU-T video coding experts group (VCEG) and the ISO/IEC moving picture experts group (MPEG). H.264/MPEG4-AVC has recently become the most widely accepted video coding standard since the deployment of MPEG2 at the dawn of digital television, and it may soon overtake MPEG2 in common use. It covers all common video applications ranging from mobile services and videoconferencing to IPTV, HDTV, and HD video storage. This article discusses the technology behind the new H.264/MPEG4-AVC standard, focusing on the main distinct features of its core coding technology and its first set of extensions, known as the fidelity range extensions (FRExt). In addition, this article also discusses the current status of adoption and deployment of the new standard in various application areas.     

VC-1视频编码技术研究

针对新一代视频编码标准VC-1，结合其主要创新内容，简要介绍了其关键技术特点。同时与H．264／AVC进行了对比，并讲述了以其合理的复杂度获得较高的主观质量。     

H.264并行视频编码的分配机制的研究

H.264作为新的视频压缩标准,采用了许多先进的算法,提供了很好的视频压缩质量。获得出色压缩效果和质量的代价是压缩编码算法复杂度的增加。为了寻求更高的编码速度,集群并行计算被运用到H.264的视频编码计算中。本文结合并行算法设计,通过对H.264视频编码的研究,分析了H.264可实现并行计算的任务单元选择;采用了片（Slice）级的H.264并行编码计算方法,并对其性能进行了测试和分析。     

Towards high efficiency video coding: Subjective evaluation of potential coding technologies

This paper describes the details and the results of the subjective quality evaluation performed at EPFL, as a contribution to the effort of the joint collaborative team on video coding (JCT-VC) for the definition of the high efficiency video coding (HEVC) standard. The performance of twenty-seven coding technologies has been evaluated with respect to two H.264/MPEG-4 AVC anchors, for high definition (HD) test material. The test campaign involved a total of 494 naive observers and took place over a period of four weeks. While similar tests have been conducted as part of the standardization process of previous video coding technologies, the test campaign described in this paper is by far the most extensive in the history of video coding standardization. A detailed statistical analysis of the subjective results is provided. The results show high consistency and support an accurate comparison of the performance of the different coding technologies.     

H．264运动估计算法优化研究

H．264是一种适应于低码率传输的新一代视频压缩标准,但其在获得高性能的同时,也导致了其复杂性很高。运动估计是运算量最大的一部分,对运动估计算法进行优化是提高编码效率的关键。基于此,从运动估计的基本原理入手,对几种典型的快速搜索算法进行了分析比较,在此基础上讨论了H．264标准中运动估计的特点和改进方法,并结合H．264标准的特点和快速搜索原理给出了H．264中运动估计快速算法的优化思路。     

Comparisons of EVD and DVD

1Introduction Chinahasthelargestmarketofaudio visualequip mentintheworld,whichisrapidlydevelopedfrom VCD,SVCDtoDVD.Now,themarketofDVDisin creasedveryfast,especiallyintheinternationalmarket(increasingbyafactorof25%everyyear).Butitis limitlessforpeopletohan…     

新一代视频压缩标准H.264

JVT(Joint Video Team)开发的新一代的低比特率视频标准H．264具有出色的编码效率和压缩性能。其基本框架和已有的视频编码标准类似，但它包含许多特有的重要的技术特征，系统介绍这些特征及其性能，H．264对于研究多媒体通信和新一代的网络业务有着重要的意义。     

面向IPTV的H.264高清编码视频质量评估

高清晰度视频质量能够有效提升IPTV的业务体验,但是高清视频对编码速率和网络条件的要求都很高.本文在IPTV环境下,基于H.264编码技术,对不同码率下的高清编码视频进行了主观质量评测.为在现阶段IPTV网络环境下开展高清视频业务提供有效的技术参考.     

A Cost-Shared Quantization Algorithm and Its Implementation for Multi-Standard Video Codecs

Due to the growing demand of digital convergence, there is a need to have a video encoder/decoder (codec) that is capable of supporting multiple video standards on a single platform. High Efficiency Video Coding (HEVC), successor to H.264/MPEG-4 AVC, is a new standard under development that aims to substantially improve coding efficiency compared to AVC High Profile. This paper presents an efficient architecture based on a resource sharing strategy that can perform the quantization operation of the emerging HEVC encoder and six other video encoders: H.264/AVC, AVS, VC-1, MPEG-2, MPEG-4, and Motion JPEG (MJPEG). Since HEVC is still in the drafting stage, the proposed architecture is designed in such a way that any final changes can be accommodated into the design. The proposed quantizer architecture is completely division-free, as the division operation is replaced by shift and addition operations for all the codecs. The design is implemented on an FPGA and later synthesized in CMOS 0.18 μm technology. While working at 190 MHz, the design can decode a 1080p HD video at up to 61 frames per second. The multi-codec architecture is also suitable for low-cost VLSI implementation.     

基于DSP的双路信道无线视频终端设计

以高性能DSP为设计核心,采用H.264编码,利用双路增强型数据业务(EDGE)信道,将视频流发送到视频服务器.提出了基于双路缓冲区判断的发送控制策略,详细描述了系统结构及软硬件设计.实验结果表明,CIF格式的图像传输基本能达到实时的要求.     

AVS trick modes for PVR and VOD services

AVS1-P2 is a recently completed video compression standard developed by the Audio and Video Coding Standard (AVS) Workgroup of China. The standard promises comparable compression efficiency to the H.264/MPEG-4 AVC video codec with lower implementation complexity and royalty fees. AVS1-P2 is the Chinese next generation national video coding standard with an increasing amount of industrial importance as it is being required for different applications and services. It is expected that AVS1-P2 will be prominent in emerging Chinese digital video application markets, especially for personal video recorder (PVR) and video on demand (VOD).This paper discusses how trick modes for PVR and VOD can be performed with AVS1-P2 content. It begins with generating an index table to facilitate AVS1-P2 trick modes followed by a discussion of basic and advanced trick modes. Next, the minimum decoder speed and display frame buffer requirements are analyzed for smooth trick play, especially for 1× rewind. VOD stream delivery strategies for various trick modes and transitions are then discussed. Finally, an overview of other topics that may affect implementation such as content protection and encoding is provided. Many of the discussions are also applicable to other video coding standards like MPEG-2, H.264/AVC, etc.     

一种面向H.264/AVC的码率控制算法

码率控制是视频编码中非常重要的技术之一,任何标准离开码率控制其应用都会受到限制.H.264/AVC是目前最新的视频编码标准,本文根据H.264/AVC编码标准的特性及其HRD部分对码率控制的要求,提出了一种新的适合H.264/AVC的码率控制算法,该算法实现了率失真优化与码率控制的结合,使得在达到码率控制的同时也能保证较高的编码效率,同时在码率控制的过程中根据HRD缓冲区状态进行位分配调整,保证了编解码缓冲区既不上溢又不下溢.该算法作为技术提案已被H.264/AVC接受,并集成到H.264/AVC的校验模型软件中.     

H．264多安全级网络视频加密方案研究

为了满足网络多媒体在安全性和实时性上多样化的加密需求,同时为新一代的视频压缩编码技术提高安全保障。基于H．264视频编码标准和密码学原理,分析现有的视频加密算法性能,同时从安全性出发,面向网络视频服务需求制定多安全级网络视频加密方案。该方案针对不同网络视频提供安全、实时的服务,提高了网络资源利用率,对网络具有良好的适应性。同时也为新一代多媒体安全保护技术提供了新的思路。     

HEVC并行解码器设计

新一代视频编码标准HEVC(High Efficiency Video Coding)主要面向高清及超高清视频编码,压缩效率相比之前的编码标准H.264有较大提高.但压缩效率的提高必然会带来计算的复杂化,为提高HEVC的解码效率,降低时延,提出了一种并行解码器架构.该并行解码器的设计是基于HEVC中熵片(Entropy slice)和波前并行处理(Wavefront Parallel Processing, WPP)技术的引入以及滤波器(Deblocking Filter)无相关性的特点.实验结果表明,该并行解码器能够充分利用硬件资源,提高解码效率.