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搜索结果: 1-15 共查到信息处理技术 H.264/AVC相关记录15条 . 查询时间(0.046 秒)
在分析现有视频水印算法的基础上,结合H.264压缩编码标准的特性,提出了一种新的基于纹理特征的视频顽健水印算法。算法先对当前帧4×4块进行整数离散余弦变换,判断其是否是纹理块,再采用能量差的方式自适应选择系数嵌入水印。实验结果表明,该算法对视频质量和码率的影响较小,并且能有效抵抗高斯噪声、低通滤波、重编码等常见的视频水印攻击。
Novel Statistical Modeling, Analysis and Implementation of Rate-Distortion Estimation for H.264/AVC Coders.
To acquire the optimal coding mode of each macroblock, the H.264/AVC encoder exhaustively calculates the ratedistortion cost for all available modes and chooses the minimum one as the best mode. There...
为了在相对有限的传输比特率下获得最佳的视觉质量,严格地保证编码比特流满足带宽和假设参考解码缓冲区的限制,码率控制成为视频图像压缩技术中重要的一部分。根据指数型率失真模型,调和平均数预测当前帧的图像复杂度,提出了一种新的H.264/AVC码率控制改进算法。实验数据表明,调和平均数方法相比于线性预测方法更为有效和准确。相比于JVT-G012码率控制算法,新算法获得了较高的比特预测精度,具备更优的缓冲区...
由于通信信道带宽有限,有必要对视频编码的输出码率进行控制。基于视频编码标准H.264采用的码率控制算法,在初始QP值的设定以及宏块层码率控制方面提出了改进。在初始QP值的计算上,提出了利用基于bpp、熵和梯度的图像复杂度对初始QP值进行估计的方法。另外利用时间上的预测信息和空间上的MAD梯度信息在宏块层对MAD预测进行了改进,能更有效地实现对码率的精确控制。实验结果表明,与H.264标准参考软件J...
在H.264/AVC视频标准中,自适应环路滤波器用于消除预测和变换过程中引入的块效应,提高编码性能,但它具有较高的复杂性,占据大量的运算时间。针对这一问题,设计和实现一种基于数字信号处理DSP平台的流水线设计方法,采用条件判断减少跳转,利用并行性加速运算。实验数据表明,该方法能提高环路滤波器的效率。
This paper proposes a transcoding scheme from AVS to H.264/AVC. As highcompression video coding standards, H.264/AVC jointly developed by MPEG and ITU and AVS developed by the Audio Video Coding Sta...
In this paper, we propose a context-based adaptive fast Intra_4x4 prediction mode decision algorithm for H.264/AVC. Firstly, a 3-order Markov random field model is introduced to describe the spatial d...
In this paper, the generalized Gaussian distribution is employed first to model the 16(4*4) integer transform coefficients of the residue image in H.264 videos. Then the distortion-rate function of ge...
In this paper, a low-complexity Adaptive Block-size Transform (ABT) scheme is proposed for the H.264/AVC.The integer 8x8/4x4 discrete cosine transforms with an extended relation are applied to the pro...
Abstract—This paper deals with the problem of shot-change detection on H.264/AVC compressed video. As H.264/AVC employs several new coding tools, the statistic information of macroblock is different ...
Transcoding is an important technique for reducing the bit rate or spatial resolution to meet the constrained transmission bandwidths and terminal capabilities. In this paper, we propose a spatial dow...
In this paper, an efficient rate-control scheme for H.264/AVC video encoding is proposed. The redesign of the quantization scheme in H.264/AVC results in that the relationship between the quantization...
H.264/AVC is a new international standard for the compression of natural video images, in which a deblocking filter has been adopted to remove blocking artifacts. In this paper, we propose an efficien...
Transcoding is a very effective method for universal media adaptation. Spatial resolution downscaling is one of the most popular transcoding applications. Although a number of transcoding methods have...

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