Patent ID: 11943441
Assignee: HYUNDAI MOTOR COMPANY
Field: Audio-visual technology (Electrical engineering)
Classification: CPC H | IPC H

Claim 0:
1. A video decoding apparatus, comprising:
a memory; and
one or more processors configured to:
decode, a bitstream to obtain 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;
calculate a quantization parameter based on the information about the quantization parameter;
derive an inference identifier (ID) from the information about the current block and selecting an inverse quantization matrix indicated by the inference ID, 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;
generate transform coefficients from the quantized coefficients using the quantization parameter and the selected inverse quantization matrix;
generate residual signals for the current block by inversely transforming the transform coefficients; and
reconstruct the current block using the residual signals,

wherein delta coefficients corresponding to a part of the inverse quantization matrix included in the list are not decoded.