面向软传输的视频编码技术研究

项目名称： 面向软传输的视频编码技术研究

项目编号： No.61472101

项目类型： 面上项目

立项/批准年度： 2015

项目学科： 计算机科学学科

项目作者： 范晓鹏

作者单位： 哈尔滨工业大学

项目金额： 82万元

中文摘要： 本研究主要针对无线视频编码传输中的悬崖效应问题，研究面向软播的视频编码方法。与传统方法不同，无线视频软播系统中视频不是被编码为敏感的二进制码流，而是有高度抗噪能力的实数序列。更重要的是视频软播属于无损编码，且最终的失真取决于信道噪声，因而可以有效杜绝悬崖效应，从而在根本上解决由信道质量不稳定引起的信源信道不匹配，由信道质量未知引起的码率控制困难，以及广播信道中各用户难以兼顾等问题。由于目前国内外对于视频软播的研究均处于起步阶段，其中很多问题仍急需解决，比如视频信号的变换表示、预测编码、能量分配与控制以及能量失真优化技术等。这些问题的解决，将使视频软播在无线视频传输的应用从潜在变为现实，并且会促进各种对于新应用的探索，以及促进视频编码理论和方法的发展。因此具有重要的理论意义和广泛的应用价值，值得深入展开。

中文关键词： 视频编码；分布式；软播

英文摘要： Cliff effect is one big issue in wireless visual communication system. In this proposal, we focus on this issue and propose to study a new kind of video coding method for softcast. Different from traditional method, the video signal is not coded into sensitive binary streams but robust real-valued sequences in video softcast. These robust real-valued sequences can be directly transmitted in the PHY layer of wireless channel without any further FEC protection. More importantly, softcast is lossless coding and its reconstruction distortion fully depends on the channel noise. This means softcast has no cliff effects, and therefore avoids a lot of problems in traditional system, including the source channel mismatch problem due to unstable channel noise, the rate decision problem due to unknown channel noise, and the difficulty of accommodating multiple users in broadcasting. Since softcast is very new, there are a lot of problem to solve, such as the transform coding problem, the predictive coding problem, the power allocation and control problem, the power-distortion optimization problem and etc. The solution of these problem will promote the application of softcast in wireless communication, as well as the advance of corresponding theory and methods. Therefore, this direction is of great importance and is worth to study.

英文关键词： Video coding;Distributed video coding;Softcast