Intra prediction method and device

An image encoding method performed by an encoding apparatus, the method comprising:

• obtaining a coding block by partitioning an image;
• determining a split type for the coding block based on a size of the coding block;
• deriving a current coding block split from the coding block based on the split type for the coding block;
• and
• encoding image information including information on the split type,
• wherein encoding the image information comprises:
• encoding a split flag indicating whether the coding block is spilt;
• based on a value of the split flag being equal to 1, encoding a first flag indicating whether the coding block is quad tree split;
• and
• based on a value of the first flag indicating that the coding block is not quad tree split, encoding a second flag indicating whether a split direction of the coding block is a vertical direction or a horizontal direction,
• wherein information on a minimum block size about the quad tree split is encoded,
• wherein the information on the minimum block size about the quad tree split is encoded at a sequence level, and
• wherein the split type is determined based on the minimum block size about the quad tree split.

A transmission method for image data, the method comprising:

• obtaining a bitstream of encoded image information, wherein the encoded image information is generated based on obtaining a coding block by partitioning an image, determining a split type for the coding block based on a size of the coding block, deriving a current coding block split from the coding block based on the split type for the coding block, and encoding image information including information on the split type;
• and
• transmitting the image data comprising the bitstream,
• wherein encoding the image information comprises:
• encoding a split flag indicating whether the coding block is spilt;
• based on a value of the split flag being equal to 1, encoding a first flag indicating whether the coding block is quad tree split;
• and
• based on a value of the first flag indicating that the coding block is not quad tree split, encoding a second flag indicating whether a split direction of the coding block is a vertical direction or a horizontal direction,
• wherein information on a minimum block size about the quad tree split is encoded,
• wherein the information on the minimum block size about the quad tree split is encoded at a sequence level, and
• wherein the split type is determined based on the minimum block size about the quad tree split.