搜索结果: 1-15 共查到“wyner-ziv”相关记录19条 . 查询时间(0.055 秒)
无反馈分布式视频编码中Wyner-Ziv帧的顽健重构算法
无反馈 分布式视频编码 Wyner-Ziv帧 顽健重构
2011/11/23
在无反馈分布式视频编码系统中，提出了一种Wyner-Ziv帧的顽健重构算法。针对比特面解码错误带来的视频质量下降问题，对DC系数和AC系数使用不同重构方法，特别是对于解码失败的DC系数量化值，利用编码端原始图像的相关信息自适应地调整边信息量化值和解码失败量化值对重构的贡献，从而完成重构。实验结果表明，与最小均方误差重构算法相比，该算法可以有效提高解码视频的平均PSNR（peak signal-to...
Wyner-Ziv视频编码中无反馈速率控制算法研究
Wyner-Ziv视频 无反馈 速率控制 目标帧率
2011/6/20
为了避免在分布式视频编码系统中使用反馈信道，提出了一种基于Wyner-Ziv编码的无反馈速率控制算法。首先，利用目标码率和目标帧率进行GOP层码率分配；然后，根据原始图像的帧间相关性动态选择量化因子和量化矩阵，来分配每个GOP内关键帧和Wyner-Ziv帧的比特数；接下来，利用系数带级的相关性计算相关噪声模型参数，并选择对应的LDPC校验矩阵，提出Wyner-Ziv帧的无反馈比特面速率控制算法。实...
CONSTANT QUALITY CONTROL OF WYNER-ZIV FRAMES IN DCT DOMAIN DISTRIBUTED VIDEO CODING
Distributed video coding Constant quality control Greedy algorithm Adaptive uniform quantizer
2010/12/10
For most DCT domain distributed video coding systems, xed uniform quan-tizers are used to quantize all Wyner-Ziv (WZ) frames. However, it leads to uctuantvideo quality because the WZ frame quality is...
泛在网络中基于压缩感知的Wyner-Ziv空域可分级视频编码
泛在网络 压缩感知 压缩感知测量 编码端
2010/10/7
提出一种适用于泛在网络中的基于压缩感知的Wyner-Ziv空域可分级视频编码。在编码端，基本层和增强层之间独立编码，基本层编码器将视频信号下采样，然后进行H.264视频编码，增强层编码器采用自适应的压缩感知测量、量化和熵编码。在解码端，利用时域稀疏模型，基本层和增强层联合进行压缩感知重建。理论分析和实验结果表明，所提编码算法能够灵活地调整输出码流，具有较好的率失真性能和传输的顽健性。
Wyner-Ziv视频编码中边信息生成算法研究
Wyner-Ziv视频编码 生成边信息 重影现象
2010/8/7
在Wyner-Ziv视频编码系统中，针对生成边信息容易出现块效应和重影现象的问题，提出了一种基于原始图像相关性的重叠块双向运动补偿算法。在编码端计算原始图像相关性，并将相关性数据发送到解码端辅助运动估计，得到较精确的运动矢量，最后通过重叠块双向运动补偿生成边信息。实验结果表明，与现有的双向运动补偿内插算法相比，提出的算法生成边信息的平均PSNR可以提高1.5~3dB，且边信息的主观质量也有明显改善...
An Auto-regressive Model for Checkboard Splitting based Wyner-Ziv Coding
Auto-regressive Model Checkboard Splitting Wyner-Ziv Coding
2009/12/31
An auto-regressive (AR) based side information (SI)generation is proposed in this paper for block based chessboard pattern Wyner-Ziv (WZ) coding, where each WZ frame is split into two sets at encoder ...
Wyner-Ziv视频编码中边信息估计改进算法
Wyner-Ziv视频编码 边信息 运动估计
2009/6/11
首先简要介绍了分布式编码基本原理和一种典型的分布式编码方案——Wyner-Ziv视频编码。然后在Wyner-Ziv视频编码中提出了一种改进边信息估计算法，该算法中运动估计采用加权MAD准则。实验仿真结果表明，采用该文算法得到的运动矢量场更为准确，同时在相同输出码率时PSNR比原始算法平均提高0.7 dB。
AN AUTO-REGRESSIVE MODEL FOR CHECKBOARD SPLITTING BASED WYNER-ZIV CODING
auto-regressive side information chessboard splitting wyner-ziv
2009/5/16
An auto-regressive (AR) based side information (SI) generation is proposed in this paper for block based chessboard pattern Wyner-Ziv (WZ) coding, where each WZ frame is split into two sets at encoder...
Spatial-Aided Low-Delay Wyner-Ziv Video Coding
Spatial-Aided Low-Delay Wyner-Ziv Video Coding
2009/1/16
In distributed video coding, the side information (SI) quality plays an important role in Wyner-Ziv (WZ) frame coding. Usually,SI is generated at the decoder by the motion-compensated interpolation (M...
Wyner–Ziv Switching Scheme for Multiple Bit-Rate Video Streaming
Wyner–Ziv Switching Scheme Multiple Bit-Rate Video Streaming
2008/12/31
This paper proposes a Wyner–Ziv (WZ) switching scheme for multiple bit-rate (MBR) video streaming over networks.Identical video content is encoded into a set of normal
streams, which are generated by...
Utilizing video correlations among views would definitely improve multiview video compression in terms of coding efficiency,which usually requests an expensive system to collect videos
from different...
Spatial-Aided Low-Delay Wyner-Ziv Video Coding
Spatial-Aided Low-Delay Wyner-Ziv Video Coding
2008/12/31
In distributed video coding, the side information (SI) quality plays an important role in Wyner-Ziv (WZ) frame coding. Usually,SI is generated at the decoder by the motion-compensated interpolation (M...
Scalable Wyner-Ziv Video Coding with Adaptive Bit-Plane Representation
Scalable Wyner-Ziv Video Coding Adaptive Bit-Plane Representation
2008/12/31
Scalable Wyner-Ziv video coding is desirable, especially for mobile devices with limited computational resources and bandwidth. However, the conventional bit-plane representation used in hybrid video ...
Wyner–Ziv-Based Multiview Video Coding
Distributed source coding multiview video coding (MVC) wavelet Wyner–Ziv (WZ) video coding
2008/6/17
Utilizing video correlations among views would defi-nitely improve multiview video compression in terms of coding effi-ciency, which usually requests an expensive system to collect videos ...
Wyner–Ziv Switching Scheme for Multiple Bit-Rate Video Streaming
Bit-stream switching correlation model multiple-bit-rate (MBR) streaming Wyner–Ziv (WZ) coding
2008/5/17
This paper proposes a Wyner–Ziv (WZ) switching scheme for multiple bit-rate (MBR) video streaming over networks. Identical video content is encoded into a set of normal streams, which are generated by...