Inter prediction method and apparatus, video encoder, and video decoder

An apparatus for coding video data, comprising:

• a non-transitory memory containing instructions;
• and
• a processor in communication with the memory and upon execution of the instructions, performs steps comprising:
• determining N target picture blocks in which M neighboring locations of a current picture block are located, wherein each of the M neighboring locations is located in one picture block, wherein any two of the N target picture blocks are different, both M and N are positive integers, and M is greater than or equal to N, and wherein the M neighboring locations of the current picture block comprise at least one of a location adjacent to a boundary of the current picture block or a location from which a distance to a boundary of the current picture block are within a specific range;
• determining candidate motion information of the current picture block based on motion information of the N target picture blocks, and adding the candidate motion information of the current picture block to a motion information candidate list of the current picture block;
• performing inter prediction on the current picture block based on the motion information candidate;
• and
• wherein the candidate motion information is candidate motion information of at least two control points of the current picture block;
• and candidate motion information of each one control point of the current picture block is derived based on all affine coding blocks in which a current neighboring location is located, after all the affine coding blocks are determined;
• wherein adding the candidate motion information to the motion information candidate list includes:
• firstly establishing a coding block candidate list including a plurality of affine coding blocks in which a plurality of neighboring locations of the current picture block are located, wherein no same affine coding block exists in the coding block candidate list;
• and deriving information from the coding block candidate list all at once and adding the information to the motion information candidate list.

A non-transitory computer-readable storage medium, the computer-readable storage medium stores instructions;

• and when the instructions are executed on a computer, the computer is enabled to perform the following steps:
• determining N target picture blocks in which M neighboring locations of a current picture block are located, wherein each of the M neighboring locations is located in one picture block, wherein any two of the N target picture blocks are different, both M and N are positive integers, and M is greater than or equal to N, and wherein the M neighboring locations of the current picture block comprise at least one of a location adjacent to a boundary of the current picture block or a location from which a distance to a boundary of the current picture block are within a specific range;
• determining candidate motion information of the current picture block based on motion information of the N target picture blocks, and adding the candidate motion information of the current picture block to a motion information candidate list of the current picture block;
• performing inter prediction on the current picture block based on the motion information candidate;
• and
• wherein the candidate motion information is candidate motion information of at least two control points of the current picture block;
• and candidate motion information of each one control point of the current picture block is derived based on all affine coding blocks in which a current neighboring location is located, after all the affine coding blocks are determined;
• wherein adding the candidate motion information to the motion information candidate list includes:
• firstly establishing a coding block candidate list including a plurality of affine coding blocks in which a plurality of neighboring locations of the current picture block are located, wherein no same affine coding block exists in the coding block candidate list;
• and deriving information from the coding block candidate list all at once and adding the information to the motion information candidate list.