基于H.264视频分区码流联合信源信道编码技术研究,通信与信息系统论文,博士硕士论文AB...基于H.264视频分区码流联合信源信道编码技术研究【论文学科】通信与信息系统论文【论文级别】硕士论文,硕士毕业论文,硕士研究生论文【中文题名】基于H.264视频分区码流联合信源信道编码技术研究【英文题名】Joint Source Channel Coding Technique Research Based on H.264 Video Partitioning Code Stream 【所属分类】信息科技,电信技术,通信【中文关键词】联合信源信道编码; 不等差错保护; 差错控制【英文关键词】Joint source channel coding; Unequal error protection; Error control【中文摘要】本文主要研究了H.264编码器生成的分区码流数据的联合信源信道编码问题,提出了针对高噪声信道环境下的的联合信源信道保护方法。
本文首先对联合信源信道编码进行了概述,分析了国内外关于联合信源信道编码的研究现状。
其次对视频压缩与差错控制做了介绍,然后对H.264视频编码标准进行了概述,并对其采用的各种关键技术进行了深入的研究。
在以上分析、研究的基础之上,结合H.264中采用的数据分类的抗误码技术设计了一种不等差错保护方案。
核心思想是在高噪声信道环境下,通过对H.264编码器生成的码流进行优先级划分,对重要数据加强信道保护,以获得较好的视频恢复效果。
此外,在实际环境下,带宽受限、高噪声环境是视频通信的难点,本文进一步提出一种方法,通过信道编码和编码端参数之间的有效匹配实现联合信源信道保护的目的,取得了良好的误码保护的效果,用有限的冗余实现了有效的误码保护。
最后,对全文的工作进行了总结,并展望了今后(来源:Afa8a8aBC论文网)有待进一步完善的工作。
(来源:A2323BC论文网)【英文摘要】H.264 is a new video coding standard. It’s developed by united video group JVT which consists of Video Coding Experts Group(VCEG) of ITU-T and Movable Image Coding Experts Group(MPEG)of ISO/IEC. It uses many new coding techniques and can improve coding efficiency obviously.In recent years, with the rapid development of communication technology, as well as individual users on the new communications needs of the business growing, multimedia communications to be especially rapid development of video communications. However, due to tremendous volume of data and videoinformation in the transmission must be carried out before compression to reduce the amount of information transmission channel. After the video compression coding information in the course of transmission is highly susceptible to channel conditions and other factors from the impact of error. Therefore, the adoption of effective anti-BER video coding technology to ensure reliable transmission of information is very necessary.Isolation Theory traditional assumptions source coding and channel coding complexity can be unlimited increase in coding design neglected some of the practical design of the design principle of the separation of the efficiency of the system may be lower, and this has stimulated a more effective joint source and channel coding methods of exploration and research. Joint Source-channel coding based on the state channel, weigh source coding and channel coding rate rate on the impact of distortion in the source and channel coding and distribution of redundancy, through a joint strategy in both coding appropriate allocation of resources, so as to achieve the bestend-to-end results to achieve the best overall performance.This paper puts forward an unequal errorprotection plan. The strategy mainly researches on how to partition the information created from source coder, and uses the corresponding unequal error protection to make the important date bits be seized of more error renew ability, the aim is to obtain the best whole performance. The paper proposes that according to effect of the different parts of the code stream created from H.264 coder to the video, we can use the different error protection according to different bits. Those bits that are important to renew video use higher channel protection (use more intendance bits to protect information code stream), otherwise those bits that are not very important to renew video use lower channel protection (not very important means that if those bits are destroyed, it will not bring very severe influence or can renew those content with some compensate method). In DP mode, macro-block dates in a slice are separated into A、B、C three parts to transmit respectively. A date includes the most important information in decoding video;B date is more important thanC dates; C date is the lowest important. Besides the three dates have these connections: B and C date are independent, but the decoding of those date must depend on A date. According to this partitionmode, coder can use unequal error protection to different date selectively in order to guarantee the most important information can be received if the channel is not good. With the FEC protection towards H.264 code stream, we use FEC1 code that has the more ability to correct the error and redundancy to protect the most important dates, including SPS、PPS and A date, and use FEC2 code that has the less ability to correct the error and redundancy to protect the less important dates, including B and C date. With this unequal error protection, we guarantee the most important information correct renew under high error condition in order to obtain the better decoding effect.The experimental results show that the video transmission in the course of error ranging from protection mechanisms implemented, although an increase of redundancy, but it could be improved to a certain extent, the transmission system performance, improve video streaming channel in the worst anti-environment BER capacity. Stationary random error channel and restore the image PSNR-Y maximum value increased 8.73 dB at least 4.49 dB increase, objective quality improvement is obvious, and UEP Without UEP system than the performance gainaccess channel error probability with the increase increase. Gauss channel and restore the image PSNR-Y maximum value increased 9.36 dB, at least 2.71 dB increase. Restoration of images from the subjective feeling, the adoption of error ranging from the protection of the restoration of the subjective image quality has been greatly enhanced. The results can be seen through the introduction of the coding strategy UEP, although an increase of redundancy, but significantly improved the quality of the decoding of the video.After researches on unequal error protection scheme, the paper put forward a joint source channel coding strategy further aim at wireless channel’s characteristic that its bandwidth is limited and error is high. The thought is that channel coding must acclimatize itself to channel\'s state, matching H.264 source coder\'s QP、the packet\'s length to FEC code\'s rate. When the channel is not good, match coarse QP to less FEC code\'s rate. If increasing the value of QP, the code\'s rate is reduced, saving the source\'s bits; these bits can be used to reinforce the ability of FEC. The other way round, when the channel is good, match exquisite QP to higher FEC code\'s rate, used to transmit high qualityvideo. Combining the match strategy with unequal error protection, we can achieve better balance with reliability and validity.The experiments results indicate that under high error environment using joint source channel coding can wipe off error effectively and also has better system performance than not using joint mechanism. Under high error environment, the PSNR Y at decoder receives improvement at high range. This can guarantee the video information reliable transmission and also can utilize the channel\'s limited bandwidth source effectively.In short, the joint source-channel video transmission technology in the protection of information, is an effective method, especially in bad channel conditions of decreased slowly, and with obvious superior system performance. Can guarantee reliable transmission of video information can be effective use of limited channel bandwidth resources. With limited redundancy to achieve an effective error protection, access to the consumption of redundancy and error a better balance between protections.内容提要4-7第一章绪论7-151.1 论文选题背景7-91.2 联合信源信道编码9-131.2.1 联合信源信道编码概述9-111.2.2 联合信源信道编码研究现状11-131.2.3 联合信源信道编码意义131.3 课题研究的内容13-15第二章视频压缩与差错控制15-222.1 视频压缩编码概述15-182.1.1 视频序列冗余特性15-162.1.2 视频编码技术16-182.2 差错控制概述18-222.2.1 误码产生原因及其影响182.2.2 视频通信差错控制技术18-22第三章H.264 视频编码标准22-323.1 H.264 编码的主要目标223.2 H.264 的基本框架22-253.2.1 H.264 的档次等级22-233.2.2 H.264 编解码器23-253.3 H.264 的关键技术25-323.3.1 图像分割25-263.3.2 帧内预测26-273.3.3 数据分类27-283.3.4 参数设置28-303.3.5 灵活的宏块排序30-32第四章H.264 视频码流的不等差错保护方案32-544.1 H.264 中句法元素组织结构32-374.1.1 H.264 分层设计32-334.1.2 Slice Layer设置33-354.1.3 NAL设置35-374.2 RTP打包规则37-404.2.1 RTP包的组织结构38-394.2.2 H.264 中RTP打包规则39-404.3 不等差错保护研究现状404.4 不等差错保护方案设计与实现40-464.4.1 联合信源信道编码原理40-424.4.2 不等差错保护方案算法描述42-434.4.3 方案实现43-464.5 实验分析46-544.5.1 实验环境设置464.5.2 算法性能测试与分析46-54第五章H.264 视频码流的联合信源信道编码保护54-705.1 码率控制54-595.1.1 码率控制的重要性54-555.1.2 码率控制的基本原理555.1.3 H.264 编码参数对码率的影响55-595.2 联合信源信道编码设计与实现59-615.2.1 联合信源信道编码算法描述59-605.2.2 联合信源信道编码实现60-615.3 实验分析61-705.3.1 实验环境设置61-635.3.2 算法性能测试与分析63-70第六章总结与展望70-726.1 全文总结70-716.2 工作展望71-72参考文献72-76摘要76-79ABSTRACT79-81致谢82-83导师及作者简介83。
