Method and device for encoding/decoding image
AssigneeElectronics and Telecommunications Research Institute
InventorsSung Chang Lim, Hui Yong Kim, Jin Ho Lee, Jin Soo Choi, Jin Woong Kim
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Abstract
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.
Claims6
A video encoding method, comprising:
- determining a quantization matrix;
- and
- encoding 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;
- wherein the encoding the information on the quantization matrix includes,
- deriving an array of arranged quantization matrix coefficients by up-right diagonally scanning the quantization matrix coefficients in the quantization matrix;
- and
- generating information representing a difference value between the arranged quantization matrix coefficients.
A non-transitory computer-readable recording medium storing a bitstream that is generated by a video encoding method, the method comprising:
- determining a quantization matrix;
- and
- encoding 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;
- wherein the encoding the information on the quantization matrix includes,
- deriving an array of arranged quantization matrix coefficients by up-right diagonally scanning the quantization matrix coefficients in the quantization matrix;
- and
- generating information representing a difference value between the arranged quantization matrix coefficients.
Dependencies are inferred from the claim text.