Encoding method and apparatus therefor, decoding method and apparatus therefor

A video decoding apparatus comprising a processor configured to:

• obtain, from a bitstream, information indicating a minimum split unit coding order (SUCO) size and information indicating a maximum SUCO size;
• obtain split information indicating whether a current block is to be split into lower blocks from the bitstream;
• when a smaller value among a height and a width of the current block is smaller than the minimum SUCO size or a larger value among the height and the width of the current block is greater than the maximum SUCO size, determine lower horizontal coding order information applied to the lower blocks to be identical to higher horizontal coding order information applied to the current block, without obtaining the lower horizontal coding order information from the bitstream;
• split the current block into the lower blocks when the split information indicates that the current block is to be split;
• and
• decode the lower blocks according to a coding order indicated by the lower horizontal coding order information.

A video encoding method comprising:

• determining whether a current block is split into lower blocks;
• when the current block is split into the lower blocks, and when a smaller value among a height and a width of the current block is smaller than a minimum split unit coding order (SUCO) size or a larger value among the height and the width of the current block is greater than a maximum SUCO size, determining lower horizontal coding order information applied to the lower blocks to be identical to higher horizontal coding order information applied to the current block, without encoding the lower horizontal coding order information into a bitstream;
• encoding, into the bitstream, the lower blocks according to a coding order indicated by the lower horizontal coding order information;
• and
• encoding, into the bitstream, information indicating the minimum SUCO size and information indicating the maximum SUCO size.

A non-transitory computer readable storage medium storing a bitstream generated by a video encoding method, the bitstream comprising:

• information indicating a minimum split unit coding order (SUCO) size;
• and
• information indicating a maximum SUCO size,
• wherein the video encoding method comprises:
• determining whether a current block is split into lower blocks;
• when the current block is split into the lower blocks, and when a smaller value among a height and a width of the current block is smaller than the minimum SUCO size or a larger value among the height and the width of the current block is greater than the maximum SUCO size, determining lower horizontal coding order information applied to the lower blocks to be identical to higher horizontal coding order information applied to the current block, without encoding the lower horizontal coding order information into the bitstream;
• encoding, into the bitstream, the lower blocks according to a coding order indicated by the lower horizontal coding order information;
• and
• encoding, into the bitstream, the information indicating the minimum SUCO size and the information indicating the maximum SUCO size.