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

Claim 8:
9. A non-transitory computer readable medium storing a bitstream containing encoded data for a block of video data, transform coefficients of the block being generated from the bitstream by processes of:
decoding 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;
calculating a quantization parameter based on the information about the quantization parameter;
deriving 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; and
generating transform coefficients from the quantized coefficients using the quantization parameter and the selected inverse quantization matrix,
wherein delta coefficients corresponding to a part of the inverse quantization matrix included in the list are not decoded,
wherein the information about the current block comprises a size of the current block.