Samsung patents video decoding method using bit-shift values

1. A decoding method comprising: obtaining first probability information for performing arithmetic decoding for a first bin regarding a first syntax element, based on a first probability model and a second probability model; obtaining the first bin regarding the first syntax element by performing arithmetic decoding based on the obtained first probability information; obtaining a value of the first syntax element corresponding to a first bin string including the first bin; obtaining second probability information for performing arithmetic decoding for a second bin regarding a second syntax element, based on a third probability model and a fourth probability model; obtaining the second bin regarding the second syntax element by performing arithmetic decoding based on the obtained second probability information; obtaining a value of the second syntax element corresponding to a second bin string including the second bin; obtaining a third bin regarding a third syntax element by performing arithmetic decoding in a bypass mode without probability information; and obtaining a value of the third syntax element corresponding to a third bin string including the third bin, wherein the first probability model is determined based on a first bit-shift value, the second probability model is determined based on a second bit-shift value, and the second bit-shift value is determined based on the first bit-shift value, the third probability model is determined based on a third bit-shift value, the fourth probability model is determined based on a fourth bit-shift value, and the fourth bit-shift value is determined based on the third bit-shift value, and at least one of the first bit-shift value, the second bit-shift value, the third bit-shift value and the fourth bit-shift value is determined based on a slice type of a current slice.