Video encoding method and apparatus and video decoding method and apparatus, based on hierarchical coded block pattern information
A method and apparatus for decoding video and a method and apparatus for encoding video are provided. The method for decoding video includes: receiving and parsing a bitstream of encoded video; extracting, from the bitstream, encoded image data of a current picture assigned to a maximum coding unit of the current picture, information regarding a coded depth of the maximum coding unit, information regarding an encoding mode, and coding unit pattern information indicating whether texture information of the maximum coding units has been encoded; and decoding the encoded image data for the maximum coding unit, based on the information regarding the coded depth of the maximum coding unit, the information regarding the encoding mode, and the coding unit pattern information.
1. A method of decoding an encoded video, the method comprising:
determining at least one coding unit by using split information extracted from a bitstream;
extracting from the bitstream transformation index information indicating whether a transformation unit of a current level included in a coding unit among the at least one coding unit is split;
when the transformation index information indicates a split of the transformation unit of the current level, splitting the transformation unit of the current level into transformation units of a lower level; and
when the transformation index information indicates a non-split of the transformation unit of the current level, obtaining pattern information for the transformation unit of the current level,
wherein the pattern information indicates whether the transformation unit of the current level contains one or more transform coefficient not equal to 0.
2. The method of claim 1 , wherein the transformation unit of the current level is included in the coding unit, and a size of the transformation unit of the current level is smaller than or equal to a size of the coding unit.
3. The method of claim 1 , wherein the transformation unit of the current level is obtained by halving a height and a width of the coding unit.
4. The method of claim 1 , wherein the coding unit is a data unit in which a picture of the encoded video is encoded and the transformation unit of the current level is a data unit in which the data of the coding unit is transformed.