Method of video coding using prediction based on intra picture block copy

• US 10,555,001 B2
• Filed: 02/17/2015
• Issued: 02/04/2020
• Est. Priority Date: 02/21/2014
• Status: Active Grant

• Current Assignee: HFI Innovation, Inc. (MediaTek, Inc.)
• Original Assignee: MediaTek Singapore Pte. Ltd. (MediaTek, Inc.)
• Inventors: Liu, Shan, Xu, Xiaozhong
• Primary Examiner(s): Hodges, Susan E.
• Application Number:
  US15/107,916
• Publication Number:
  US 20160330474A1
• Time in Patent Office: 1,813 Days
• Field of Search: 375240
• CPC Class Codes: H04N 19/132 Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
• CPC Class Codes: H04N 19/503 involving temporal prediction adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109
• CPC Class Codes: H04N 19/523 with sub-pixel accuracy
• CPC Class Codes: H04N 19/56 Motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate a search
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards

Abstract

A method of signaling of coding mode including an IntraBC mode (Intra-block copy mode) and inter prediction mode for a picture, wherein the picture is divided into multiple coding units, the method includes receiving input data associated with a current prediction unit in a current picture, and responsive to the IntraBC mode being selected for the current prediction unit: encoding or decoding the current prediction unit using an IntraBC predictor derived based on an IntraBC reference picture selected from a reference picture list, wherein the reference picture list includes the IntraBC reference picture containing one or more reconstructed IntraBC blocks and one or more Inter reference pictures corresponding to one or more reconstructed Inter-coded pictures; generating a first reconstructed current block after said encoding or decoding the current prediction unit; and updating the IntraBC reference picture according to the first reconstructed current block.

Claims

1. A method of signaling of coding mode including an IntraBC mode (Intra-block copy mode) and inter prediction mode for a picture, wherein the picture is divided into multiple coding units, the method comprising:

receiving input data associated with a current prediction unit in a current picture;

responsive to the IntraBC mode being selected for the current prediction unit,

encoding or decoding the current prediction unit using an IntraBC predictor derived based on an IntraBC reference picture selected from a reference picture list, wherein

the IntraBC reference picture is included in the reference picture list as a reference picture and is placed as a last reference picture in the reference picture list,

the reference picture list corresponds to reference picture list l0 or reference picture list l1, and

the reference picture list includes the IntraBC reference picture containing one or more previously reconstructed blocks in the current picture and includes one or more Inter reference pictures corresponding to one or more previously reconstructed Inter-coded pictures;

generating a first reconstructed current block after said encoding or decoding the current prediction unit; and

updating the IntraBC reference picture according to the first reconstructed current block.

2. The method of claim 1, wherein the IntraBC reference picture is included in the reference picture list as a new reference picture.

3. The method of claim 2, wherein responsive to the IntraBC reference picture being included in the reference picture list as the new reference picture, the IntraBC reference picture is initialized as an empty picture.

4. The method of claim 1, wherein the first reconstructed current block is filtered using a filter before the first reconstructed current block is used to update the IntraBC reference picture.

5. The method of claim 4, wherein the filter corresponds to sample adaptive offset (SAO).

6. The method of claim 1, wherein the IntraBC predictor is derived based on the IntraBC reference picture using a motion vector in sub-pel accuracy.

7. The method of claim 1, further comprising in response to the Inter prediction mode being selected for the current prediction unit:

encoding or decoding the current prediction unit using an Inter predictor derived based on at least one Inter reference picture selected from the reference picture list;

generating a second reconstructed current block after said encoding or decoding the current prediction unit; and

updating the IntraBC reference picture according to the second reconstructed current block.

8. The method of claim 1, wherein the IntraBC reference picture is included in the reference picture list by replacing one existing Inter reference picture.

9. The method of claim 8, wherein responsive to the IntraBC reference picture being included in the reference picture list by replacing one existing Inter reference picture, the IntraBC reference picture is initialized as said one existing Inter reference picture.

10. An apparatus for signaling of coding mode including an IntraBC mode (Intra-block copy mode) and inter prediction mode for a picture, wherein the picture is divided into multiple coding units, the apparatus comprising:

one or more electronic circuits configured to;

receive input data associated with a current prediction unit in a current picture;

responsive to the IntraBC mode being selected for the current prediction unit,

encode or decode the current prediction unit using an IntraBC predictor derived based on an IntraBC reference picture selected from a reference picture list, wherein

the IntraBC reference picture is included in the reference picture list as a reference picture and is placed as a last reference picture in the reference picture list,

the reference picture list corresponds to reference picture list l0 or reference picture list l1, and

the reference picture list includes the IntraBC reference picture containing one or more previously reconstructed blocks in the current picture and includes one or more Inter reference pictures corresponding to one or more previously reconstructed Inter-coded pictures;

generate a first reconstructed current block after said encoding or decoding the current prediction unit; and

update the IntraBC reference picture according to the first reconstructed current block.

11. The apparatus of claim 10, wherein the one or more electronic circuits are configured to include the IntraBC reference picture in the reference picture list as a new reference picture.

12. The apparatus of claim 11,

wherein responsive to the IntraBC reference picture being included in the reference picture list as the new reference picture, the IntraBC reference picture is initialized as an empty picture.

13. The apparatus of claim 10, wherein the one or more electronic circuits are configured to include the IntraBC reference picture in the reference picture list by replacing one existing Inter reference picture.

14. The apparatus of claim 13,

wherein responsive to the IntraBC reference picture being included in the reference picture list by replacing one existing Inter reference picture, the IntraBC reference picture is initialized as said one existing Inter reference picture.

15. A non-transitory computer medium comprising machine-readable software code that, when executed by one or more processors, causes the one or more processors to implement a method of signaling of coding mode including an IntraBC mode (Intra-block copy mode) and inter prediction mode for a picture, wherein the picture is divided into multiple coding units, the method comprising:

receiving input data associated with a current prediction unit in a current picture;

responsive to the IntraBC mode being selected for the current prediction unit,

encoding or decoding the current prediction unit using an IntraBC predictor derived based on an IntraBC reference picture selected from a reference picture list, wherein

the IntraBC reference picture is included in the reference picture list as a reference picture and is placed as a last reference picture in the reference picture list,

the reference picture list corresponds to reference picture list l0 or reference picture list l1, and

the reference picture list includes the IntraBC reference picture containing one or more previously reconstructed blocks in the current picture and includes one or more Inter reference pictures corresponding to one or more previously reconstructed Inter-coded pictures;

generating a first reconstructed current block after said encoding or decoding the current prediction unit; and

updating the IntraBC reference picture according to the first reconstructed current block.