联合信源信道编码方案 [4]
论文作者:www.51lunwen.org论文属性:学术文章 Scholarship Essay登出时间:2016-04-26编辑:lily点击率:13574
论文字数:3451论文编号:org201604221634068797语种:英语 English地区:西班牙价格:免费论文
关键词:JSCC编码视频传输
摘要:本文首先给出多个链接文章对当前JSCC技术的情况进行简要介绍,然后对其基本概念、应用领域、应用方法等进行说明,并对部分代码的情况进行了分析。
stem model considered for the proposed JSCC for colour-and-depth representation of 3D video illustrated in 5‑3. At the transmitter (Tx), color and depth videos are separately compressed by H.264/AVC source coding and then protected by low-density parity-check (LDPC) codes. The output bit streams are rearranged to get single output at the multiplexer. Subsequently, the output from multiplexer is transmitted by WiMAX over a Rayleigh fading channel. At the receiver (Rx), received data stream is separated back to 2 data streams before decoded by LDPC and H.264/AVC decoders, respectively. At the end of the process, colour and depth map are reconstructed.
The main concept of JSCC is that both the source coding and channel coding are adapted according to channel conditions in order to minimize the distortion. Distortion in video communication can be separated into two major types. The first type is the quantization distortion introduced by lossy source encoding and the second type is caused by channel noise. These distortions are simply called “source distortion” and “channel distortion”. The overall distortion is equal to the addition of source and channel distortions. A popular measure for distortion is a mean square error (MSE). The overall picture distortion at the receiver end can be defined as the MSE between the received video frame and the original one. But it is a well known fact that due to the lack of correlations with the human visual system (HVS) MSE can not evaluate the quality as by a panel of human [13]. The main objective of this chapter is to investigate on minimizing the effect of these two types of distortions, using a JSCC approach, from a perceptual quality point of view.
H.264/AVC源编码——H.264/AVC Source Coding
Since early 1990s, when the video coding technology was in its immaturity, international standards, sequentially, H.261 [[xiii]], MPEG-1 [[xiv]], MPEG-2/H.262 [[xv]], H.263 [[xvi]], and MPEG-4 (Part 2) [[xvii]] have been the motivation behind the success of digital video compression. In 2003 JVT (Joint video Team) developed H.264/AVC source coding standard and today it is considered as one of the most powerful video compression standards of all time. This can achieve almost twice the coding gain when compared to former video compression standards like H.263. Studies have shown that [[xviii]] H.264/AVC can not only offer high quality services for high-bandwidth networks but also an acceptable quality service for low-bandwidth services. H.264/AVC standard is capable of providing technical solutions to a broad rage of application areas that covers all varieties of digital compressed video, including video broadcasting, video on demand (VOD), Multimedia Messaging Services (MMS) and serial or interactive storage on magnetic and optical devices. Moreover, due to flexible and customizable deign of the codec new applications may be deployed over the existing
architecture. This is because the design architecture covers a Video Coding Layer (VCL), which is intended to efficiently represent the video content, and a Network
Abstraction Layer (NAL), which organize the VCL representation of the video in a manner to allow the same video syntax to be compatible in different network environments. These features, along with several others, aid H.264/AVC to perform considerably better than any prior video coding standard under a wide range
本论文由英语论文网提供整理,提供论文代写,英语论文代写,代写论文,代写英语论文,代写留学生论文,代写英文论文,留学生论文代写相关核心关键词搜索。