Method and device for video coding and decoding

A video decoding method comprising:

• obtaining slice and slice set division information from a bit stream to be decoded;
• decoding the bit stream according to the obtained slice and slice set division information, wherein the obtained information includes whether a current slice contains slice set syntax elements in the bit stream;
• and
• when none of the slice set syntax elements is present in a slice, using the syntax set syntax elements for decoding the current slice that are
• a) the same as any slice set syntax elements of a slice containing one or more slice set syntax element that occurs before the current slice in a current slice set, or
• b) the same as any slice set syntax elements of a first slice in the current slice set.

A non-transitory computer readable medium storing instructions for execution by a video decoder, the instructions comprising:

• instructions for obtaining slice and slice set division information from a bit stream to be decoded, wherein a slice comprises blocks continuous in a scanning sequence in a picture, and a slice set comprises one or more slices;
• and
• instructions for decoding the bit stream according to the slice and slice set division information obtained by the slice information obtaining unit and reconstruct the picture;
• and
• instructions for one or both of the following:
• a) obtaining, from the bit stream, a ratio of a resolution used for coding of data inside the slice in the slice set and an original resolution of the slice and decoding the data according to the ratio;
• and
• b) obtaining a quantity of storage bits required for each piece of decoded data when slice data in the slice set is decoded and decoding the data according to the quantity of the storage bits.

A video decoding method comprising:

• obtaining slice and slice set division information from a bit stream to be decoded;
• and
• decoding the bit stream according to the obtained slice and slice set division information, wherein the decoding includes one or both of the following:
• a) obtaining, from the bit stream, a ratio of a resolution used for coding of data inside the slice in the slice set and an original resolution of the slice and decoding the data according to the ratio;
• and
• b) obtaining a quantity of storage bits required for each piece of decoded data when slice data in the slice set is decoded and decoding the data according to the quantity of the storage bits.

A video coder comprising a processor and a memory, wherein the memory includes instructions executed by the processor so as to configure to:

• divide a picture to be encoded into several slices, each containing macroblocks continuous in a scanning sequence in the picture;
• group the slices contained in the picture into one or more slice sets, each containing one or more of the slices;
• and
• encode slices in the slice sets according to slice and slice set division information to get a coded bit stream of the picture, wherein the information includes whether one or more slice set syntax elements are present in a current slice;
• wherein when none of the slice set syntax elements is present in the current slice, using syntax set syntax elements for encoding the current slice that are
• a) the same as any slice set syntax elements of a slice containing one or more slice set syntax elements that occurs before the current slice in a current slice set, or
• b) the same as any slice set syntax elements of a first slice in the current slice set.

A video coder comprising a processor and a memory, wherein the memory includes instructions executed by the processor so as to configure to:

• obtain slice and slice set division information from a bit stream to be decoded;
• decode the bit stream according to the obtained slice and slice set division information, wherein the obtained information includes whether a current slice contains slice set syntax elements in the bit stream;
• and
• when none of the slice set syntax elements is present in a slice, using the syntax set syntax elements for decoding the current slice that are
• a) the same as any slice set syntax elements of a slice containing one or more slice set syntax element that occurs before the current slice in a current slice set, or
• the same as any slice set syntax elements of a first slice in the current slice set.