Decoding method, encoding method and apparatuses

An encoding method for a picture, performed by an encoding side, and comprising:

• dividing a picture frame into one or more coding units (CUs);
• determining a plurality of quantization parameter (QP) values for the picture frame, wherein a CU of the one or more CUs comprises a plurality of pixels, each of the plurality of pixels corresponds to a respective QP value in the plurality of QP values, and at least two pixels of the plurality of pixels have different QP values, and for each of the plurality of pixels, the respective QP value corresponding to the pixel is adaptively adjusted based on information of one or more reconstructed pixels surrounding the pixel;
• and
• encoding, based on the plurality of QP values, the picture frame.

A video coding system, comprising:

• an encoding device;
• and
• a decoding device, wherein the encoding device is communicatively connected to the decoding device,
• wherein the encoding device is configured to:
• divide a picture frame into one or more coding units (CUs);
• determine a plurality of quantization parameter (QP) values for the picture frame;
• and
• encode, based on the plurality of QP values, the picture frame;
• wherein the decoding device is configured to:
• analyze a code stream to obtain one or more picture frames, wherein the one or more picture frames comprise the picture frame that comprises the one or more CUs;
• determine a plurality of QP values for the picture frame;
• and
• decode, based on the plurality of QP values, the picture frame;
• wherein a CU of the one or more CUs comprises a plurality of pixels, each of the plurality of pixels corresponds to a respective QP value in the plurality of QP values, and at least two pixels of the plurality of pixels have different QP values, and for each of the plurality of pixels, the respective QP value corresponding to the pixel is adaptively adjusted based on information of one or more reconstructed pixels surrounding the pixel.