An image decoding device in accordance with this invention includes: a prediction unit to create a prediction block by rebuilding the mode preview function of the current block,in the current block or sub-block of the current block units: a reverse scan unit to convert residual marks into a two-dimensional quantum block; a unit reverse quantification for reverseQuantification of the quantum block using a quantum parameter and a reverse transformation unit to reverse transformation of the reverse transformation block Quantification. The predictable quantum parameterwhich is used to reconstruct the quantum parameter,is produced using the quantum parameters of the coding units on the left and above the current coding unit (CU). Therefore,image quality is improved by adaptive control of quantum parameters based on coding size,and image compression performance is improved by efficient coding and decoding of quantum parameters that reduce the number of duplicates required for the transmission of quantum parameters.
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