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    • 82. 发明申请
    • Method and apparatus for generating a quantisation matrix that can be used for encoding an image or a picture sequence
    • 用于生成可用于编码图像或图像序列的量化矩阵的方法和装置
    • US20060133479A1
    • 2006-06-22
    • US11293610
    • 2005-12-02
    • Ying ChenJiefu Zhai
    • Ying ChenJiefu Zhai
    • H04N11/04H04N11/02H04N7/12H04B1/66
    • H04N19/192H04N19/126H04N19/134H04N19/154H04N19/172H04N19/174H04N19/177H04N19/60H04N19/61
    • A significant data rate reduction effect in video coding is acchieved by quantizing the transformed frequency coefficients or components of a pixel block so that thereafter fewer amplitude levels need to be encoded and part of the quantised amplitude values becomes zero and need not be encoded as quantised amplitude values. Many transform based video coding standards use a default quantization matrix to achieve better subjective video coding/de-coding quality. A quantization matrix assigns smaller scaling values to some frequency components of the block if the related horizontal and/or vertical frequencies are believed to be the less important frequency components with respect to the resulting subjective picture quality. The inventive quantization matrix generation starts from default quantization matrices and derives therefrom a perceptually optimum quantization matrix for a given picture sequence. In a first pass the candidate quantization matrix for a given picture sequence is iteratively constructed by simultaneously increasing scaling values for some coefficient positions and decreasing scaling values for other ones of the coefficient positions. In a second pass the generated quantization matrix is applied for re-encoding the picture sequence.
    • 通过量化像素块的变换的频率系数或分量来获得视频编码中的显着的数据速率降低效果,以便此后需要编码更少的幅度水平,并且部分量化振幅值变为零并且不需要被编码为量化幅度 价值观。 许多基于变换的视频编码标准使用默认量化矩阵来实现更好的主观视频编码/解码质量。 如果相关的水平和/或垂直频率相对于所得到的主观图像质量不太重要的频率分量,则量化矩阵将更小的缩放值分配给块的某些频率分量。 本发明的量化矩阵生成从默认量化矩阵开始,并从其导出用于给定图像序列的感知最佳量化矩阵。 在第一遍中,给定图像序列的候选量化矩阵通过同时增加一些系数位置的缩放值并减小其他系数位置的缩放值来迭代地构造。 在第二遍中,生成的量化矩阵被应用于重新编码图像序列。