DECODING METHOD, DECODER APPARATUS, ENCODING METHOD, AND ENCODER APPARATUS

摘要

A decoding method includes: obtaining a plurality of quantization parameter sets from a header of a coded stream (S400); parsing an identifier from a header of a coded picture included in the coded stream (S402); selecting at least one quantization parameter set from among the plurality of quantization parameter sets, based on the parsed identifier (S404); determining whether a flag parsed from the header of the coded picture has a predetermined value (S408); generating a new quantization matrix from another quantization matrix when the flag has the predetermined value (S410); decoding the coded picture by inversely quantizing the coded picture using the generated new quantization matrix (S412); and decoding the coded picture by inversely quantizing the coded picture using a quantization matrix included in the selected quantization parameter set when the flag does not have the predetermined value (S414).