Flexible tiling in video coding

Patent metadata

Field	Value
Publication number	US-11778205-B2
Application number	US-202117357724-A
Country	US
Kind code	B2
Filing date	Jun 24, 2021
Priority date	Dec 27, 2018
Publication date	Oct 3, 2023
Grant date	Oct 3, 2023

Abstract

A video coding mechanism is disclosed. The mechanism includes partitioning a picture into a plurality of first level tiles. A subset of the first level tiles is partitioned into a plurality of second level tiles. Each second level tile contains a single rectangular slice of picture data. The first level tiles and the second level tiles are encoded into a bitstream. The bitstream is stored for communication toward a decoder.

First claim

What is claimed is:

1. A method implemented in an encoder, the method comprising:
partitioning a picture into a plurality of first level tiles;
partitioning a subset of the first level tiles into a plurality of second level tiles that each contains a single rectangular slice of picture data;
encoding the first level tiles and the second level tiles into a bitstream; and
storing, in a memory of the encoder, the bitstream for communication toward a decoder.

2. The method of claim 1 , wherein the first level tiles outside the subset contain picture data at a first resolution, and wherein the second level tiles contain picture data at a second resolution different from the first resolution.

3. The method of claim 1 , wherein each of the first level tiles in the subset of the first level tiles includes two or more complete second level tiles.

4. The method of claim 1 , further comprising encoding data indicating a configuration of second level tiles in a picture parameter set associated with the picture.

5. The method of claim 4 , wherein the configuration of second level tiles is signaled as a number of second level tile columns and a number of second level tile rows.

6. The method of claim 1 , wherein data explicitly indicating a number of second level tile columns and a number of second level tile rows is omitted from the bitstream when a first level tile width is less than twice a minimum width threshold and a first level tile height is less than twice a minimum height threshold.

7. The method of claim 1 , further comprising assigning the first level tiles and the second level tiles into one or more tile groups such that all tiles in a corresponding tile group are constrained to cover a rectangular portion of the picture.

8. The method of claim 1 , further comprising encoding split indications indicating the first level tiles that are partitioned into second level tiles, wherein the split indications are omitted from the bitstream when a first level tile width is less than a minimum width threshold and a first level tile height is less than a minimum height threshold.

9. A method implemented in a decoder, the method comprising:
receiving a bitstream including a picture partitioned into a plurality of first level tiles including a subset of the first level tiles further partitioned into a plurality of second level tiles that each contains a single rectangular slice of picture data;
determining a configuration of the first level tiles and a configuration of the second level tiles based on parameters included in the bitstream;
decoding the first level tiles and the second level tiles based on the configuration of the first level tiles and the configuration of the second level tiles; and
generating a reconstructed video sequence for display based on the first level tiles and the second level tiles as decoded.

10. The method of claim 9 , wherein the first level tiles outside the subset contain picture data at a first resolution and the second level tiles contain picture data at a second resolution different from the first resolution.

11. The method of claim 9 , wherein each of the first level tiles in the subset of the first level tiles includes two or more complete second level tiles.

12. The method of claim 9 , further comprising obtaining data indicating the configuration of the second level tiles from a picture parameter set associated with the picture.

13. The method of claim 9 , wherein the configuration of the second level tiles is signaled as a number of second level tile columns and a number of second level tile rows.

14. The method of claim 9 , wherein data explicitly indicating a number of second level tile columns and a number of second level tile rows is omitted from the bitstream when a first level tile width is less than twice a minimum width threshold and a first level tile height is less than twice a minimum height threshold.

15. The method of claim 9 , wherein the first level tiles and the second level tiles are assigned into one or more tile groups such that all tiles in a corresponding tile group are constrained to cover a rectangular portion of the picture.

16. The method of claim 9 , further comprising obtaining split indications indicating the first level tiles that are partitioned into second level tiles, wherein the split indications are omitted from the bitstream when a first level tile width is less than a minimum width threshold and a first level tile height is less than a minimum height threshold.

17. An encoding device, comprising:
a memory storing instructions; and
a processor coupled to the memory, the processor configured to execute the instructions to cause the encoding device to:
partition a picture into a plurality of first level tiles;
partition a subset of the first level tiles into a plurality of second level tiles that each contains a single rectangular slice of picture data;
encode the first level tiles and the second level tiles into a bitstream; and
store, in the memory, the bitstream for communication toward a decoder.

18. The encoding device of claim 17 , further comprising a transmitter coupled to the processor, the transmitter configured to transmit the bitstream toward the decoder.

19. A decoding device, comprising:
a memory storing instructions; and
a processor coupled to the memory, the processor configured to execute the instructions to cause the decoding device to:
receive a bitstream including a picture partitioned into a plurality of first level tiles including a subset of the first level tiles further partitioned into a plurality of second level tiles that each contains a single rectangular slice of picture data;
determine a configuration of the first level tiles and a configuration of the second level tiles based on parameters included in the bitstream;
decode the first level tiles and the second level tiles based on the configuration of the first level tiles and the configuration of the second level tiles; and
generate a reconstructed video sequence for display based on the first level tiles and the second level tiles as decoded.

20. The decoding device of claim 19 , further comprising a display configured to display the reconstructed video sequence.

Assignees

• Huawei Tech Co Ltd

Inventors

• Wang Ye-Kui
• Hendry Fnu
• Sychev Maxim Borisovitch

Classifications

• H04N19/174 Primary

  the region being a slice, e.g. a line of blocks or a group of blocks · CPC title

• H04N19/119 Primary

  Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks · CPC title

• H04N19/172

  the region being a picture, frame or field · CPC title

• H04N19/30

  using hierarchical techniques, e.g. scalability (H04N19/63 takes precedence) · CPC title

• H04N19/44

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title