Adaptive dequantization method and apparatus in video coding

An adaptive dequantization method in video coding, comprising:

• determining an image area (X), in a current decoded image, corresponding to a first transform coefficient set, the first transform coefficient set comprising N transform coefficients of any color space component in the current decoded image, and N being a positive integer;
• obtaining temporal neighborhood pixel information of X;
• calculating a quantization adjustment factor according to a first variance (Pvar), the Pvar being a variance of luminance components of multiple pixels or a variance of the same color space components of the multiple pixels, and the color space component corresponding to the first transform coefficient set;
• and
• performing dequantization processing on the first transform coefficient set according to the quantization adjustment factor to obtain a second transform coefficient set.

An adaptive dequantization apparatus in video coding, comprising:

• a memory comprising instructions;
• and
• a processor coupled to the memory and configured to execute the instructions, which causes the processor to be configured to:
• determine an image area, in a current decoded image, corresponding to a first transform coefficient set, the first transform coefficient set comprising N transform coefficients of any color space component in the current decoded image, and N being a positive integer;
• obtain decoded pixel information of the image area, the decoded pixel information comprising spatial neighborhood pixel information of the image area;
• calculate a quantization adjustment factor according to third function (ƒ3(Pmax−Pmin)) of a difference between a maximum pixel value (Pmax) and a minimum pixel value (Pmin), the Pmax being a maximum value of luminance components of multiple pixels corresponding to the decoded pixel information or a maximum value of the same color space components of the multiple pixels, the Pmin being a minimum value of the luminance components of the multiple pixels or a minimum value of the same space components of the multiple pixels, and the color space component corresponding to the first transform coefficient set;
• and
• perform dequantization on the first transform coefficient set according to the quantization adjustment factor to obtain a second transform coefficient set.