Image decoding method, image coding method, image decoding apparatus, image coding apparatus, and image coding and decoding apparatus

摘要

An image decoding method for decoding a bitstream including a coded signal resulting from coding slices into which an image is partitioned and each of which includes coding units, includes decoding the coded signal, wherein each of the slices is either a normal slice having, in a slice header, information used for another slice or a dependent slice which is decoded using information included in a slice header of another slice, the image includes rows each of which includes coding units, and when the normal slice starts at a position other than the beginning of the first row, the second row immediately following the first row does not start with the dependent slice.

主权项

1. An image coding method for coding a plurality of slices into which an image is partitioned and each of which includes a plurality of coding units, to generate a bitstream, the method comprising:
partitioning the image into the slices; and coding the slices resulting from the partitioning, wherein each of the slices is either a normal slice having, in a slice header, information used for another slice or a dependent slice which is decoded using information included in a slice header of another slice, the image includes a plurality of rows each of which includes two or more of the coding units, and in the partitioning, when the normal slice starts at a position other than a beginning of a first row, the image is partitioned into the slices to cause a second row immediately following the first row to not start with the dependent slice, wherein in the coding, arithmetic coding of the second row is initialized using a context obtained after arithmetic coding of one of the coding units that is located second in the first row.