Video decoding method based on hierarchical coded block pattern information

A method of decoding an encoded video comprising:

• determining at least one coding unit by using split information extracted from 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 square 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,
• wherein a height of each of the square transformation units of the lower level is half a height of the transformation unit of the current level.