Encoding method and device of video using data unit of hierarchical structure, and decoding method and device thereof

摘要

Provided are a method and a device for encoding a video by using a data unit of a hierarchical structure, and a method and a device for decoding the same. A video encoding device includes: a hierarchical encoder configured to encode a picture of a video based on a data unit of a hierarchical structure; and an entropy coder configured to determine a context model used for entropy coding of a symbol based on hierarchical information of a data unit to which the symbol of the encoded picture belongs, and to entropy encode the symbol using the determined context model.

主权项

1. A video decoding method comprising:
receiving a bitstream including a transformation unit split flag indicating whether a transformation unit of a current transformation depth is split, the transformation unit being included in a coding unit; determining a context model based on a size of the transformation unit of the current transformation depth; obtaining the transformation unit split flag by entropy decoding the bitstream based on the determined context model; when the transformation unit split flag indicates a split of the transformation unit of the current transformation depth, splitting the transformation unit of the current transformation depth into four rectangular transformation units of a lower transformation depth; and when the transformation unit split flag indicates a non-split of the transformation unit of the current transformation depth, performing inverse-transformation on the transformation unit of the current transformation depth, wherein the context model includes information to determine a most probable symbol (MPS), and wherein:
a rectangular transformation unit has a shape with a width and a height that are a same length,an image is split into a plurality of maximum coding units according to information about the maximum size of the coding unit,a current maximum coding unit among the plurality of maximum coding units is hierarchically split into one or more coding units of depths including at least one of a current depth and a lower depth according to split information,when the split information indicates a split for the current depth, a coding unit of the current depth is split into four coding units of the lower depth, independently from neighboring coding units, andwhen the split information indicates a non-split for the current depth, one or more transformation units are obtained from the coding unit of the current depth.