有限次反馈的分布式视频编解码技术研究

发布时间：2018-01-08 16:05

本文关键词：有限次反馈的分布式视频编解码技术研究　出处：《西安电子科技大学》2014年硕士论文　论文类型：学位论文

【摘要】：分布式视频编解码(DVC)因其简单的编码端复杂度、高的压缩效率和鲁棒性等特点在新兴的无线视频传输领域得到了广泛的应用。现有的DVC系统从结构上分为有反馈信道和无反馈信道两种。有反馈信道的DVC系统利用反馈信道对解码速率进行调节从而保证视频信号以最小的码率成功解码,但是频繁的反馈增加了视频处理的时延和复杂度;无反馈信道的DVC系统不需要反馈信道进行码率调节,具有较少视频传输时延,但是很难同时满足较低的编码端复杂度和较高的压缩性能。为了解决以上两种DVC系统的缺点,本文提出了一种有限次反馈的DVC系统,采用新的反馈控制算法对DVC系统的反馈次数进行限制。该反馈控制算法将码率估计过程分为两部分:初始码率计算和附加码率计算,通过有目的地进行附加码率的请求来减少反馈次数。为了获得更好的率失真性能,本文在已有的DVC框架上增加了视频序列的划分、边信息更新和相关噪声模型更新模块。视频序列的划分模块根据像素块的运动程度判断当前帧是否需要进行复杂的编解码过程,以降低编解码复杂度和码率。解码端利用已经正确解码的比特平面对边信息和相关噪声模型进行更新以减少误码率,提高图像解码重建后的质量。实验结果表明本文提出的反馈控制算法很大程度上减少了反馈重传的次数,使得有限次反馈DVC系统的最大反馈次数为3。当反馈次数为1时,同样获得了较好的性能。本文提出的有限次反馈的DVC系统在率失真性能上优于无反馈的DVC系统,同时接近文献中没有反馈次数限制的DVC系统。
[Abstract]:Distributed video coding (DVC) because of its simple encoding complexity, compression efficiency and robustness characteristics such as high have been widely applied in the emerging field of wireless video transmission. The existing DVC system is structurally divided into a feedback channel and feedback channel. There are two kinds of channel decoding speed is adjusted in order to ensure the success rate of the video signal to the minimum decoding feedback using DVC system feedback channel, but frequent feedback increases the delay of video processing and complexity; DVC system without feedback channel does not need to adjust the channel feedback rate, with fewer video transmission delay, but it is difficult to satisfy the compression performance of the lower end of encoding complexity and higher. In order to solve the above two disadvantages of DVC systems, this paper proposes a limited feedback DVC system using feedback control algorithm of new DVC system feedback To limit the number. The rate estimation process is divided into two parts: the initial rate feedback control algorithm and additional rate calculation, additional rate by to request to reduce the number of feedback. In order to obtain a better rate distortion performance, this paper adds the video sequence in the DVC frame on the side information update and the correlation noise model updating module. Modules of video sequences to determine whether the need for the current frame decoding process complex according to the degree of motion pixel block, in order to reduce the decoding complexity and decoding rate. Using bit plane has been correctly decoded on the side information and correlation noise model is updated in order to reduce the error rate, improve the quality of the image decoding reconstruction. The experimental results show that the proposed feedback control algorithm greatly reduces the feedback number of retransmission, the limited time counter The maximum number of feedback for DVC system is 3.. When the number of feedback is 1, it also achieves better performance. The finite feedback DVC system proposed in this paper is better than the DVC system without feedback in the rate distortion performance, and it is close to the DVC system without feedback in the literature.

【学位授予单位】：西安电子科技大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN919.81

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