METHOD AND APPARATUS FOR HIERARCHICAL DATA UNIT-BASED VIDEO ENCODING AND DECODING COMPRISING QUANTIZATION PARAMETER PREDICTION

摘要

A method of decoding a video includes determining an initial value of a quantization parameter (QP) used to perform inverse quantization on coding units included in a slice segment, based on syntax obtained from a bitstream; determining a slice-level initial QP for predicting the QP used to perform inverse quantization on the coding units included in the slice segment, based on the initial value of the QP; and determining a predicted QP of a first quantization group of a parallel-decodable data unit included in the slice segment, based on the slice-level initial QP.

主权项

1. A video decoding apparatus comprising:
a processor configured to obtain a quantization parameter of a slice, generate a predicted quantization parameter of a current quantization group using the quantization parameter of the slice, generate a predicted quantization parameter of a next quantization group using the quantization parameter of the slice, and perform an inverse quantization on the current quantization group and the next quantization group, wherein the current quantization group is a first quantization group in a current row included in the slice, the next quantization group is a first quantization group in a next row included in the slice, and each of the current row and the next row comprises a plurality of largest coding units.