Video encoding method and apparatus, video decoding method and apparatus, and device, system and storage medium

A video encoding method, comprising:

• dividing a current block into N regions, wherein N is a positive integer;
• determining a second quantization coefficient of a current region, and performing parity hiding on all or a portion of the second quantization coefficient, to obtain a first quantization coefficient, wherein the current region is a region that comprises at least one non-zero quantization coefficient in the N regions;
• and
• determining a target context model corresponding to the first quantization coefficient, and encoding the first quantization coefficient using the target context model to obtain a bitstream, wherein parity of a quantization coefficient whose parity is hidden of the first quantization coefficient is indicated by P quantization coefficients of the current region, and P is a positive integer.

A video decoder, comprising a memory and a processor;

• wherein
• the memory is configured to store a computer program;
• and
• the processor is configured to execute the computer program to implement:
• decoding a bitstream, to obtain P quantization coefficients of a current region, wherein the current region is a region of a current block that comprises at least one non-zero quantization coefficient, and P is a positive integer;
• determining, according to the P quantization coefficients, parity of a quantization coefficient whose parity is hidden of a first quantization coefficient, wherein the first quantization coefficient is a quantization coefficient obtained by performing parity hiding on all or a portion of a second quantization coefficient, the second quantization coefficient is a quantization coefficient whose parity is not hidden of the current region;
• determining a target context model corresponding to the first quantization coefficient, and decoding the first quantization coefficient which is encoded based on context using the target context model, to obtain a decoded first quantization coefficient;
• and
• determining the second quantization coefficient according to the parity of the quantization coefficient whose parity is hidden and the decoded first quantization coefficient.