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    • 70. 发明授权
    • Quantization method and apparatus in encoding/decoding
    • 编码/解码中的量化方法和装置
    • US09258568B2
    • 2016-02-09
    • US12210890
    • 2008-09-15
    • Jianhua ZhengJianwen ChenYun HeXinjian Meng
    • Jianhua ZhengJianwen ChenYun HeXinjian Meng
    • H04N7/12H04N11/02H04N11/04H04N19/174H04N19/176H04N19/70H04N19/46H04N19/61H04N19/126H04N19/154H04N19/18H04N19/177
    • H04N19/174H04N19/126H04N19/154H04N19/176H04N19/177H04N19/18H04N19/46H04N19/61H04N19/70
    • A method and apparatus is provided for implementing quantization in encoding/decoding. Firstly, the quantization on the picture transformed coefficient matrix is performed using a quantization parameter model, that is, the coefficient matrix is modeled as a parameter model represented by only several parameters, in which the parameter model includes two sorts of parameters, frequency band distribution parameters and frequency band weighting parameters. Thus, a quantization matrix conforming to the human vision system can be obtained by controlling the model parameters and the subjective quality of the encoded picture can be easily controlled. Secondly, the method does not need to store or transfer the quantization matrix in the bitstream which help to improve the encoding efficiency. Finally, the quantization on picture transformed coefficients using the method is well adapted to the content information of the picture to be encoded. Therefore, the present invention can improve the subjective quality of the encoded picture.
    • 提供了一种用于在编码/解码中实现量化的方法和装置。 首先,使用量化参数模型来执行对图像变换系数矩阵的量化,即,将系数矩阵建模为仅由几个参数表示的参数模型,其中参数模型包括两种参数,频带分布 参数和频带加权参数。 因此,可以通过控制模型参数来获得符合人类视觉系统的量化矩阵,并且可以容易地控制编码图像的主观质量。 其次,该方法不需要存储或传送比特流中的量化矩阵,这有助于提高编码效率。 最后,使用该方法的图像变换系数的量化很好地适应于要编码的图像的内容信息。 因此,本发明可以提高编码图像的主观质量。