Method and apparatus for encoding/decoding image

An apparatus for decoding an image, the apparatus comprising:

• a bitstream obtainer configured to obtain block split information of a current coding unit;
• and
• a decoder configured to determine at least one coding unit for splitting an image, based on the block shape information, determine at least one transformation unit, based on a shape of the current coding unit included in the at least one coding unit, and decode the image by performing inverse transformation based on the at least one transformation unit,
• wherein the block shape information indicates whether the current coding unit is a square shape or a non-square shape.

A method of encoding an image, the image encoding method comprising:

• determining at least one coding unit for splitting an image;
• determining at least one transformation unit, based on a shape of a current coding unit included in the at least one coding unit;
• encoding the image by performing transformation, based on the at least one transformation unit;
• and
• generating a bitstream including the encoded image and block shape information indicating whether the current coding unit is a square shape or a non-square shape.