METHOD AND DEVICE FOR ENCODING/DECODING IMAGE

摘要

A method and a device for encoding/decoding an image are disclosed. The method for decoding an image comprises the steps of: decoding information on a quantization matrix; and restoring the quantization matrix on the basis of the information on the quantization matrix, wherein the information on the quantization matrix includes information indicating a DC value of the quantization matrix and/or information indicating differential values of quantization matrix coefficients.

主权项

1. A video decoding method, comprising:
decoding a bitstream to generate a transform coefficient block; decoding information on a quantization matrix; reconstructing a quantization matrix based on the information on the quantization matrix, wherein the information on the quantization matrix includes at least one of information indicating a prediction method of the quantization matrix, information on a reference quantization matrix identifier of the quantization matrix, information representing a DC value of the quantization matrix, and information representing a difference value between quantization matrix coefficients; and scaling the transform coefficient block based on the quantization matrix, wherein the reconstructing of the quantization matrix includes, deriving a quantization matrix coefficient by using the information representing a difference value between the quantization matrix coefficients, and arranging the quantization matrix coefficients in the quantization matrix by up-right diagonally scanning the quantization matrix coefficients.