US 2017/0289562 A1Published application

Encoder and Decoder and Methods Thereof for Encoding/Decoding a Picture of a Video Sequence

AssigneeTelefonaktiebolaget LM Ericsson (publ)

InventorsJonatan Samuelsson, Rickard Sjöberg

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Abstract

An object of the embodiments is to achieve an improved reference picture handling. That is achieved by taking into account whether the reference pictures in the decoded picture buffer are long-term reference pictures or short-term reference pictures when determining how they should be marked when the information of the reference picture set is received. The reference pictures are marked as “used for short-term reference” or “used for long-term reference” in the Decoded Picture Buffer (DPB) depending on whether they are included as short-term pictures or long-term pictures in the RPS of a current picture.

Claims6

Dependent claims

A mobile device comprising a decoder for managing reference pictures to be used for decoding an encoded representation of a picture of a video sequence, the decoder configured to decode a reference picture set received from an encoder, wherein the reference picture set comprises information of the reference pictures to be kept in a decoded picture buffer and to decode a Picture Order Count (POC) value indicated in the reference picture set, the decoder comprising a processor configured to:

determine if the POC value indicated in the reference picture set corresponds to a short-term reference picture or to a long-term reference picture;
keep, when there is a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a long-term reference picture, the long-term reference picture in a decoded picture buffer as a long-term reference picture;
mark, when there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a long-term reference picture and there is not a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set, the short-term reference picture in the decoded picture buffer as a long-term reference picture and keeping it in the decoded picture buffer;
and
keep, when there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a short-term reference picture, the short-term reference picture in the decoded picture buffer as a short-term reference picture.

2 more elements

A display comprising a decoder for managing reference pictures to be used for decoding an encoded representation of a picture of a video sequence, the decoder configured to decode a reference picture set received from an encoder, wherein the reference picture set comprises information of the reference pictures to be kept in a decoded picture buffer and to decode a Picture Order Count (POC) value indicated in the reference picture set, the decoder comprising a processor configured to:

determine if the POC value indicated in the reference picture set corresponds to a short-term reference picture or to a long-term reference picture;
keep, when there is a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a long-term reference picture, the long-term reference picture in a decoded picture buffer as a long-term reference picture;
mark, when there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a long-term reference picture and there is not a long-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set, the short-term reference picture in the decoded picture buffer as a long-term reference picture and keeping it in the decoded picture buffer;
and
keep, when there is a short-term reference picture in the decoded picture buffer with a POC value corresponding to the POC value indicated in the reference picture set and the POC value indicated in the reference picture set corresponds to a short-term reference picture, the short-term reference picture in the decoded picture buffer as a short-term reference picture.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/628,005Filed 20 Jun 2017
Priority: 24 Oct 2011
Published: 5 Oct 2017
Term ends: Not estimatedThe source records don’t support an estimate.

Classification5 codes

H04N 19/50
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: using predictive coding
H04N 19/423
Characterised by implementation details or hardware specially adapted for video compression or decompression, e.g. dedicated software…
H04N 19/44
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: decoders specially adapted therefor, e.g. video…
H04N 19/70
Methods or arrangements for coding, decoding, compressing or decompressing digital video signals: characterised by syntax aspects related to video…

Family

Application61/550,646Us provisional application · filed 24 Oct 2011
Application13/643,688Continuation · filed 16 Nov 2012
Application14/996,711Continuation · filed 15 Jan 2016
Application15/628,005Continuation
US 10,708,613 B2Related patent
US 2014/0079119 A1Published application
US 2016/0134885 A1Published application
US 9,277,219 B2Related patent
US 9,706,218 B2Related patent
US 2017/0289562 A1This patent

From the US filing history. Foreign family members aren’t listed.

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