Patent ID: 11962775
Assignee: HYUNDAI MOTOR COMPANY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. An inverse quantization device comprising:
an entropy decoder configured to decode information about a current block, information about quantized coefficients, information about a quantization parameter, a delta index for an inverse quantization matrix, and delta coefficients of the inverse quantization matrix from a bitstream;
a quantization parameter calculator configured to calculate a quantization parameter based on the information about the quantization parameter;
an inverse quantization matrix generator configured to derive an inference identifier (ID) from the information about the current block and select an inverse quantization matrix indicated by the inference ID; and
a transform coefficient generator configured to generate transform coefficients from the quantized coefficients using the quantization parameter and the selected inverse quantization matrix,
wherein a list for the inverse quantization matrix is pre-generated, and an inverse quantization matrix included in the list is generated using a predictive inverse quantization matrix calculated based on the delta index, and delta inverse quantized data generated from the delta coefficients
wherein delta coefficients corresponding to a part of the inverse quantization matrix included in the list are not decoded.