Encoding and decoding methods and apparatuses with multiple image block division manners

An encoding method, comprising:

• determining that a current image block is required to be partitioned;
• in response to determining that the current image block is required to be partitioned, determining that the current image block is required to be partitioned in a horizontal direction;
• in response to the current image block being required to be partitioned in the horizontal direction, partitioning the current image block into four rectangular subblocks, wherein a size of the current image block is expressed as 4×16, and a size of each of the four rectangular subblocks is expressed as 1×16;
• and
• writing information into a bitstream, wherein the information specifies whether the current image block is required to be partitioned and whether the current image block is required to be partitioned in the horizontal direction or the vertical direction.

A non-transitory computer-readable storage medium storing a bitstream and one or more instructions executable by at least one processor to perform operations of encoding of the bitstream, the operations comprising:

• determining that a current image block is required to be partitioned;
• in response to determining that the current image block is required to be partitioned, determining that the current image block is required to be partitioned in a horizontal direction;
• in response to the current image block being required to be partitioned in the horizontal direction, partitioning the current image block into four rectangular subblocks, wherein a size of the current image block is expressed as 4×16, and a size of each of the four rectangular subblocks is expressed as 1×16;
• and
• writing information into a bitstream. wherein the information specifies whether the current image block is required to be partitioned and whether the current image block is required to be partitioned in the horizontal direction or the vertical direction.