Encoding device, encoding method, decoding device, and decoding method

Patent metadata

Field	Value
Publication number	US-10499079-B2
Application number	US-201815980852-A
Country	US
Kind code	B2
Filing date	May 16, 2018
Priority date	Sep 28, 2012
Publication date	Dec 3, 2019
Grant date	Dec 3, 2019

Abstract

The present technology relates to an encoding device, an encoding method, a decoding device, and a decoding method, which are capable of sharing or predicting information related to a reference image of an image having a hierarchical structure. An enhancement encoding unit sets reference image specifying generation information used for generation of reference image specifying information of an enhancement image using reference image specifying information serving as information related to a reference image used when the enhancement image is encoded and reference image specifying information serving as information related to a reference image of a base image. The enhancement encoding unit encodes the enhancement image using the reference image, and generates encoded data. A transmission unit transmits the encoded data and the reference image specifying generation information. For example, the present technology can be applied to the encoding device.

First claim

The invention claimed is:

1. A decoding device, comprising:
circuitry configured to:
receive an encoded stream comprising encoded data of an image;
generate a first reference image specifying information using a reference image generation information generated by using a first reference image information that is information for specifying a reference image of a first slice of an enhancement image and a second reference image information that is information for specifying a reference image of a second slice of a base image as collocated to the first slice; and]
decode the encoded data of the image using the first reference image based on the first reference image specifying information,
wherein a flag in the encoded stream indicates that the second reference image information is used as the first reference image information as the reference image generation information.

2. The decoding device according to claim 1 ,
wherein the encoded stream comprises the reference image specifying information.

3. The decoding device according to claim 2 ,
wherein the circuitry is configured to generate the reference image specifying information based on the reference image generation information of SPS (Sequence Parameter Set) extracted from the encoded stream.

4. The decoding device according to claim 2 ,
wherein the circuitry is configured to generate the reference image specifying information based on the reference image generation information of a slice header extracted from the encoded stream.

5. The decoding device according to claim 2 ,
wherein the circuitry is configured to:
generate the second reference image information as the first reference image information based on the reference image generation information.

6. The decoding device according to claim 2 ,
wherein the circuitry is configured to:
receive a difference between the first reference image information and the second reference image information and information indicating that the first reference image information is predicted from the second reference image information and the difference as the reference image generation information;
add the second reference image information to the difference received by the reception unit based on the information; and
generate an addition value obtained as a result as the first reference image information.

7. The decoding device according to claim 2 ,
wherein the circuitry is configured to:
receive information specifying an enhancement layer; and
generate the first reference image information based on information specifying the enhancement layer.

8. The decoding device according to claim 2 ,
wherein the circuitry is configured to:
weight the first reference image of the first slice using weighting information including a weight coefficient, wherein the first reference image information is the weighting information of the first reference image, the second reference image information is the weighting information of the second reference image;
weight the first reference image using the first reference image specifying information; and
decode encoded data using the first reference image.

9. The decoding device according to claim 8 ,
wherein the circuitry is configured to:
weight the first reference image of the first slice as condition that the second reference image of the second slice is weighted.

10. A decoding method, comprising:
receiving an encoded stream comprising encoded data of an image;
generating, using circuitry, a first reference image specifying information using a reference image generation information generated by using a first reference image information that is information for specifying a reference image of a first slice of an enhancement image and a second reference image information that is information for specifying a reference image of a second slice of a base image as collocated to the first slice; and
decoding, using the circuitry, the encoded data of the image using the first reference image based on the first reference image specify information,
wherein a flag in the encoded stream indicates that the second reference image information is used as the first reference image information as the reference image generation information.

11. The decoding method according to claim 10 ,
comprising receiving, using the circuitry, the reference image specifying information in the encoded stream.

12. The decoding method according to claim 11 ,
comprising generating, using the circuitry, the reference image specifying information based on the reference image generation information of SPS (Sequence Parameter Set) extracted from the encoded stream.

13. The decoding method according to claim 11 ,
comprising generating, using the circuitry, the reference image specifying information based on the reference image generation information of a slice header extracted from the encoded stream.

14. The decoding method according to claim 11 , comprising:
generating, using the circuitry, the second reference image information as the first reference image information based on the reference image generation information.

15. The decoding method according to claim 11 ,
comprising:
receiving, using the circuitry, a difference between the first reference image information and the second reference image information and information indicating that the first reference image information is predicted from the second reference image information and the difference as the reference image generation information;
adding, using the circuitry, the second reference image information to the difference received by the reception unit based on the information; and
generating, using the circuitry, an addition value obtained as a result as the first reference image information.

16. The decoding method according to claim 11 , comprising:
receiving, using the circuitry, information specifying an enhancement layer; and
generating, using the circuitry, the first reference image information based on information specifying the enhancement layer.

17. The decoding method according to claim 11 ,
comprising:
weighting, using the circuitry, the first reference image of the first slice using weighting information including a weight coefficient, wherein the first reference image information is the weighting information of the first reference image, the second reference image information is the weighting information of the second reference image;
weighting, using the circuitry, the first reference image using the first reference image specifying information; and
decoding, using the circuitry, encoded data using the first reference image.

18. The decoding method according to claim 17 ,
comprising:
weighting, using the circuitry, the first reference image of the first slice as condition that the second reference image of the second slice is weighted.

19. The decoding device according to claim 1 , wherein the flag is set to a sequence parameter set (SPS) of the encoded stream.

20. The decoding method according to claim 10 , wherein the flag is set to a sequence parameter set (SPS) of the encoded stream.

Assignees

• Sony Corp

Inventors

• Sato Kazushi
• Lu Shuo

Classifications

• H04N19/96

  Tree coding, e.g. quad-tree coding · CPC title

• H04N19/30

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

• H04N19/70

  characterised by syntax aspects related to video coding, e.g. related to compression standards · CPC title

• H04N19/597 Primary

  specially adapted for multi-view video sequence encoding · CPC title

• H04N19/53 Primary

  Multi-resolution motion estimation; Hierarchical motion estimation · CPC title