Video encoding method for encoding hierarchical-structure symbols and a device therefor, and video decoding method for decoding hierarchical-structure symbols and a device therefor

摘要

Provided is a video encoding method and an apparatus for performing the same, and a video decoding method and an apparatus for performing the same. The video encoding method for encoding symbols having a hierarchical structure includes: encoding a picture of a video based on data units having a hierarchical structure; determining symbols of the encoded picture based on the data units having the hierarchical structure; determining an encoding method of the symbols based on characteristics of symbols, which are determined based on the data units having the hierarchical structure; and encoding and outputting the symbols according to the determined encoding method.

主权项

1. A video encoding method performed by a video encoder for encoding symbols having a hierarchical structure, the video encoding method comprising:
encoding, by the video encoder based on data units having a hierarchical structure, a picture of a video; determining, by the video encoder based on the data units having the hierarchical structure, symbols of the encoded picture; determining, by the video encoder based on characteristics of the symbols, an encoding method of the symbols, the characteristics of the symbols being determined based on the data units having the hierarchical structure; and encoding and outputting, by the video encoder, the symbols according to the determined encoding method, wherein:
the determining the encoding method comprises selectively determining a symbol encoding method from among a symbol reverse encoding mode and a non-reverse encoding mode;in the symbol reverse encoding mode, symbol values of symbols of data units in a lowermost level are reversed and encoded; andin the non-reverse encoding mode, symbol values of symbols of data units in a lowermost level are encoded without being reversed, based on a ratio of symbol values that are 0 from among symbol values of the data units having the hierarchical structure.