A method for video decoding to obtain a quantization parameter and an apparatus therefor a method for video encoding to transmit a quantization parameter and an apparatus therefor

摘要

A video decoding method according to an embodiment provided in the present disclosure obtains, from a picture parameter set, a QP initial value to be applied to a current picture and picture header QP difference value information, and the picture header QP difference value information is the current picture. When it is indicated that the QP difference value information is present in the picture header, a first QP difference value for the current picture is obtained from the picture header, and the QP for the coding unit included in the current picture is combined with the QP initial value. A method of determining using the first QP difference value, performing inverse quantization on the coding unit using the QP to obtain transform coefficients of the coding unit, and reconstructing the coding unit using the transform coefficients provides