Inverse quantization device and method used in video decoding device
AssigneesHyundai Motor Company, Kia Corporation, Kwangwon University Industry-Academic Collaboration Foundation
InventorsDong Gyu Sim, Sea Nae Park, Jong Seok Lee, Seung Wook Park, Wha Pyeong Lim
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Abstract
An inverse quantization method is implemented by an inverse quantization device, the method configured for acquiring quantized coefficients, estimating a quantization parameter in quantization groups or quantization parameter prediction group units, generating an inverse quantization matrix for adaptive quantization, and generating transform coefficients from the quantized coefficients using the quantization parameter and the inverse quantization matrix.
Claims12
A video decoding method for decoding a video data by a video decoding apparatus, comprising:
- decoding 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;
- 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;
- generating transform coefficients from the quantized coefficients using the quantization parameter and the selected inverse quantization matrix;
- generating residual signals for the current block by inversely transforming the transform coefficients;
- and
- reconstructing 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.
A non-transitory computer readable medium storing a bitstream containing an encoded video data, the encoded video data being decoded from the bitstream by processes of:
- decoding 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;
- 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;
- generating transform coefficients from the quantized coefficients using the quantization parameter and the selected inverse quantization matrix;
- generating residual signals for the current block by inversely transforming the transform coefficients;
- and
- reconstructing 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.
Dependencies are inferred from the claim text.