Coding and decoding methods of a picture block, corresponding devices and data stream

Patent metadata

Field	Value
Publication number	US-2016014419-A1
Application number	US-201414769087-A
Country	US
Kind code	A1
Filing date	Feb 17, 2014
Priority date	Feb 22, 2013
Publication date	Jan 14, 2016
Grant date	—

Abstract

A method for decoding a picture block is disclosed. The decoding method comprises:
decoding decoded data, and information for identifying a reconstructed reference picture in a decoder picture buffer; reconstructing another reference picture from the identified reconstructed reference picture identified by the information and from the decoded data; replacing in the decoder picture buffer the reconstructed reference picture identified by the information with the another reference picture; and reconstructing the picture block from the another reference picture.

First claim

1 . A method comprising:
decoding information for identifying a reconstructed reference picture in a decoder picture buffer, and decoded data; reconstructing another reference picture from said reconstructed reference picture identified by said information and from said decoded data; replacing in said decoder picture buffer said reconstructed reference picture identified by said information with said another reference picture; and reconstructing a picture block from at least said another reference picture.

2 . The method according to claim 1 , wherein said reconstructed reference picture identified by said information and said another reference picture are temporally aligned.

3 . The method according to claim 1 , further comprising decoding information representative of an instant in time at which said reconstructed reference picture identified by said information is replaced by the another reference picture in the decoder picture buffer.

4 . The method according to claim 1 , further comprising decoding a flag indicating whether or not the another reference picture is displayed.

5 . The method according to claim 1 , wherein the reconstructed reference picture identified by said information is decoded from a base layer of a layered stream.

6 . The method according to claim 5 , wherein the decoded data and the information for identifying the reconstructed reference picture identified by said information are decoded from an enhancement layer of the layered stream.

7 . A method comprising:
encoding a reference picture from another reconstructed reference picture and information for identifying said another reconstructed reference picture in a decoder picture buffer, wherein said at least one reference picture when reconstructed replaces said another reconstructed reference picture in the decoder picture buffer; and encoding a picture block from said reference picture.

8 . The method according to claim 7 , wherein said another reconstructed reference picture and said reference picture are temporally aligned.

9 . The method according to claim 7 , further comprising encoding information representative of an instant in time at which said another reconstructed reference picture is replaced by the reference picture in the decoder picture buffer.

10 . The method according to claim 7 , further comprising encoding a flag indicating whether or not the reference picture is displayed.

11 . The method according to claim 7 , wherein the another reconstructed reference picture is encoded in a base layer of a layered stream.

12 . The method according to claim 11 , wherein said reference picture and the information for identifying the another reconstructed reference picture in the decoder picture buffer are encoded in an enhancement layer of the layered stream.

13 - 19 . (canceled)

20 . A decoder comprising at least a processor configured to:
decode information for identifying a reconstructed reference picture in a decoder picture buffer, and decoded data; reconstruct another reference picture from said reconstructed reference picture identified by said information and from said decoded data; replace in said decoder picture buffer said reconstructed reference picture identified by said information with said another reference picture; and reconstruct a picture block from at least said another reference picture.

21 . An encoder comprising at least a processor configured to:
encode a reference picture from another reconstructed reference picture and information for identifying said another reconstructed reference picture in a decoder picture buffer, wherein said at least one reference picture when reconstructed replaces said another reconstructed reference picture in the decoder picture buffer; and encoding a picture block from said reference picture.

Assignees

• Thomson Licensing

Inventors

• Bordes Philippe
• Hiron Franck
• Andrivon Pierre
• Lopez Patrick
• Salmon Philippe

Classifications

• H04N21/2358 Primary

  for generating different versions, e.g. for different recipient devices · CPC title

• H04N19/30

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

• H04N21/4384 Primary

  involving operations to reduce the access time, e.g. fast-tuning for reducing channel switching latency · CPC title

• H04N19/44

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

• H04N19/573

  Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction · CPC title