Method and apparatus for encoding image
Provided is a method of decoding an image, the method including: determining at least one prediction unit included in a current frame that is one of at least one frame forming the image; determining a reference region to be referred to by a current prediction unit that is one of the at least one prediction unit; changing a sample value included in at least one of the current prediction unit and the reference region, based on an analyzing result of a sample value of the reference region; determining a sample value included in the current prediction unit, based on a result of changing the sample value; and decoding the image based on the determined sample value of the current prediction unit.
1. A method of decoding an image, the method comprising:
obtaining, from a bitstream, first information indicating whether a planar mode is used;
when the first information indicates that the planar mode is not used, obtaining, from the bitstream, second information indicating at least one most probable mode to be used in determining an intra prediction mode of a current block; and
decoding the image according to the intra prediction mode determined by using the second information,
wherein the at least one most probable mode is determined by referring to an intra prediction mode performed in a block adjacent of the current block.