Image encoding/decoding method and apparatus for performing prediction on basis of reconfigured prediction mode type of leaf node, and bitstream transmission method

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

• obtaining a current block corresponding to a leaf node of a split tree structure based on a predetermined prediction mode type;
• determining a prediction mode type of the current block as either an intra type MODE_TYPE_INTRA or the predetermined prediction mode type;
• and
• encoding prediction mode information of the current block based on the determined prediction mode type,
• wherein the determination of the prediction mode type of the current block is performed based on a slice type and size of the current block.

A non-transitory computer-readable recording medium storing a bitstream generated by an image encoding method, the image encoding method comprising:

• obtaining a current block corresponding to a leaf node of a split tree structure based on a predetermined prediction mode type;
• determining a prediction mode type of the current block as either an intra type MODE_TYPE_INTRA or the predetermined prediction mode type;
• and
• encoding prediction mode information of the current block based on the determined prediction mode type,
• wherein the determination of the prediction mode type of the current block is performed based on a slice type and size of the current block.

A method of transmitting a bitstream generated by an image encoding method, the image encoding method comprising:

• obtaining a current block corresponding to a leaf node of a split tree structure based on a predetermined prediction mode type;
• determining a prediction mode type of the current block as either an intra type MODE_TYPE_INTRA or the predetermined prediction mode type;
• and
• encoding prediction mode information of the current block based on the determined prediction mode type,
• wherein the determination of the prediction mode type of the current block is performed based on a slice type and size of the current block.