Motion vector obtaining method and apparatus

A coding apparatus, comprising:

• a non-transitory computer-readable medium configured to store computer-readable instructions;
• and
• one or more processors in communication with the non-transitory computer-readable medium and configured to execute the computer-readable instructions stored in the non-transitory computer-readable medium thereby performing operations comprising:
• determining a target offset vector of a block and identifier information of a target picture, wherein the block comprises a plurality of sub-blocks;
• determining a location of a current sub-block of the plurality of sub-blocks;
• determining a target location coordinate value of a collocated sub-block by performing a clipping operation on an initial location coordinate value of the collocated sub-block to be within a range, wherein the initial location coordinate value is determined based on the location of the current sub-block and the target offset vector, and the collocated sub-block is in the target picture and corresponds to the current sub-block, wherein the target picture is indicated by the identifier information and wherein the range is determined based on a location and a size of a coding tree unit CTU in which the block is included, a size of the target picture, and an extension range of a temporal motion vector field of the CTU;
• obtaining a motion vector of the current sub-block based on a motion vector corresponding to the target location coordinate value;
• and
• generating predicted sample values of the block, wherein the predicted sample values of the block include predicted sample values of the plurality of sub-blocks, and wherein predicted sample values of the current subblock is generated based on the motion vector of the current sub-block.

A non-transitory computer-readable medium, storing programming instructions, which, when executed by one or more processors, cause the one or more processors to perform operations of:

• determining a target offset vector of a block and identifier information of a target picture, wherein the block comprises a plurality of sub-blocks;
• determining a location of a current sub-block of the plurality of sub-blocks;
• determining a target location coordinate value of a collocated sub-block by performing a clipping operation on an initial location coordinate value of the collocated sub-block to be within a range, wherein the initial location coordinate value is determined based on the location of the current sub-block and the target offset vector, and the collocated sub-block is in the target picture and corresponds to the current sub-block, wherein the target picture is indicated by the identifier information, and wherein the range is determined based on a location and a size of a coding tree unit CTU in which the block is included, a size of the target picture, and an extension range of a temporal motion vector field of the CTU;
• obtaining a motion vector of the current sub-block based on a motion vector corresponding to the target location coordinate value;
• and
• generating predicted sample values of the block, wherein the predicted sample values of the block include predicted sample values of the plurality of sub-blocks, and wherein predicted sample values of the current subblock is generated based on the motion vector of the current sub-block.