US 11,122,289 B2Granted

Method for video coding and an apparatus

AssigneeNokia Technologies Oy

InventorsMehmet Oguz Bici, Jani Lainema, Kemal Ugur

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Abstract

A method and apparatus are provided for encoding and decoding image information. The encoding comprises receiving a block of pixels; creating a set of motion vector prediction candidates for the block of pixels; and examining the set to determine if a motion vector prediction candidate is a temporal motion vector prediction, or a spatial motion vector prediction. If the motion vector prediction candidate is a temporal motion vector prediction, the motion vector prediction candidate is kept in the set. If the motion vector prediction candidate is a spatial motion vector prediction, it is examined whether the set comprises a motion vector prediction candidate corresponding with the spatial motion vector prediction; and if so, the motion vector prediction candidate is removed from the set. Once the set is created, one of the candidates from the set is selected to represent a motion vector prediction for the block of pixels.

Claims25

Dependent claims

A method for encoding an image, the method comprising:

creating, by codec circuitry, a set of motion vector prediction candidates for a block of pixels, said set of motion vector prediction candidates comprising more than one temporal motion vector predictions, said creating the set comprising:
examining a motion vector prediction candidate to distinguish between a temporal motion vector prediction and a spatial motion vector prediction by determining whether the motion vector prediction candidate is a temporal motion vector prediction or is not a temporal motion vector prediction;
if the motion vector prediction candidate is a temporal motion vector prediction, including the motion vector prediction candidate in the set without comparing temporal data of the motion vector prediction candidate with other motion vector prediction candidates in the set and without any duplicate motion vector information for temporal motion vector predictions being removed such that inclusion of the temporal motion vector prediction in the set results in the set of motion vector prediction candidates comprising more than one temporal motion vector predictions;
and
if the motion vector prediction candidate is based on only a spatial motion vector prediction, determining whether to include the motion vector prediction candidate in the set or not based on a value of the motion vector prediction candidate and a value of at least one spatial motion vector already included in the set;
and
selecting, by the codec circuitry, one motion vector prediction candidate from the set to represent a motion vector prediction for the block of pixels.

4 more elements

A method for decoding an encoded image, the method comprising:

creating, by codec circuitry, a set of motion vector prediction candidates for an encoded block of pixels, said set of motion vector prediction candidates comprising more than one temporal motion vector predictions, said creating the set comprising:
examining a motion vector prediction candidate to distinguish between a temporal motion vector prediction and a spatial motion vector prediction by determining whether the motion vector prediction candidate is a temporal motion vector prediction or is not a temporal motion vector prediction;
if the motion vector prediction candidate is a temporal motion vector prediction, including the motion vector prediction in the set without comparing temporal data of the motion vector prediction candidate with other motion vector prediction candidates in the set and without any duplicate motion vector information for temporal motion vector predictions being removed such that inclusion of the temporal motion vector prediction in the set results in the set of motion vector prediction candidates comprising more than one temporal motion vector predictions;
and
if the motion vector prediction candidate is based on only a spatial motion vector prediction, determining whether to include the motion vector prediction candidate in the set or not based on a value of the motion vector prediction candidate and a value of at least one spatial motion vector already included in the set;
and
selecting, by the codec circuitry, one motion vector prediction candidate from the set to represent a motion vector prediction for the block of pixels.

4 more elements

An apparatus embodied by a codec for encoding an image, the apparatus comprising:

a processor and
a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus to:
create a set of motion vector prediction candidates for a block of pixels, said set of motion vector prediction candidates comprising more than one temporal motion vector predictions, wherein the memory and the computer program code configured to, with the processor, create the set cause the apparatus to:
examine a motion vector prediction candidate to distinguish between a temporal motion vector prediction and a spatial motion vector prediction by determining whether the motion vector prediction candidate is a temporal motion vector prediction or is not a temporal motion vector prediction;
if the motion vector prediction candidate is a temporal motion vector prediction, include the motion vector prediction in the set without comparing temporal data of the motion vector prediction candidate with other motion vector prediction candidates in the set and without any duplicate motion vector information for temporal motion vector predictions being removed such that inclusion of the temporal motion vector prediction in the set results in the set of motion vector prediction candidates comprising more than one temporal motion vector predictions;
and
if the motion vector prediction candidate is based on only a spatial motion vector prediction, determine whether to include the motion vector prediction candidate in the set or not based on a value of the motion vector prediction candidate and a value of at least one spatial motion vector already included in the set;
and
select one motion vector prediction candidate from the set to represent a motion vector prediction for the block of pixels.

6 more elements

An apparatus embodied by a codec for decoding an encoded image, the apparatus comprising:

a processor and
a memory including computer program code, the memory and the computer program code configured to, with the processor, cause the apparatus to:
create a set of motion vector prediction candidates for an encoded block of pixels, said set of motion vector prediction candidates comprising more than one temporal motion vector predictions, wherein the memory and the computer program code configured to, with the processor, create the set cause the apparatus to:
examine a motion vector prediction candidate to distinguish between a temporal motion vector prediction and a spatial motion vector prediction by determining whether the motion vector prediction candidate is a temporal motion vector prediction or is not a temporal motion vector prediction;
if the motion vector prediction candidate is a temporal motion vector prediction, include the motion vector prediction in the set without comparing temporal data of the motion vector prediction candidate with other motion vector prediction candidates in the set and without any duplicate motion vector information for temporal motion vector predictions being removed such that inclusion of the temporal motion vector prediction in the set results in the set of motion vector prediction candidates comprising more than one temporal motion vector predictions;
and
if the motion vector prediction candidate is based on only a spatial motion vector prediction, determine whether to include the motion vector prediction candidate in the set or not based on a value of the motion vector prediction candidate and a value of at least one spatial motion vector already included in the set;
and
select one motion vector prediction candidate from the set to represent a motion vector prediction for the block of pixels.

6 more elements

A non-transitory machine-readable medium having instructions stored therein, which when executed by a processor of a codec, cause the processor to perform a method for decoding an encoded image, the method comprising:

creating a set of motion vector prediction candidates for an encoded block of pixels, said set of motion vector prediction candidates comprising more than one temporal motion vector predictions, said creating the set comprising:
examining a motion vector prediction candidate to distinguish between a temporal motion vector prediction and a spatial motion vector prediction by determining whether the motion vector prediction candidate is a temporal motion vector prediction or is not a temporal motion vector prediction;
if the motion vector prediction candidate is a temporal motion vector prediction, including the motion vector prediction in the set without comparing temporal data of the motion vector prediction candidate with other motion vector prediction candidates in the set and without any duplicate motion vector information for temporal motion vector predictions being removed such that inclusion of the temporal motion vector prediction in the set results in the set of motion vector prediction candidates comprising more than one temporal motion vector predictions;
and
if the motion vector prediction candidate is based on only a spatial motion vector prediction, determining whether to include the motion vector prediction candidate in the set or not based on a value of the motion vector prediction candidate and a value of at least one spatial motion vector already included in the set;
and
selecting one motion vector prediction candidate from the set to represent a motion vector prediction for the block of pixels.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/997,175Filed 4 Jun 2018 · continuation
Published: US 2018/0288432 A14 Oct 2018
Granted: 14 Sep 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

H04N 19/521
Processing of motion vectors: for estimating the reliability of the determined motion vectors or motion vector field, e.g. for smoothing the…
H04N 19/52
By encoding: by predictive encoding
H04N 19/56
Motion estimation or motion compensation: motion estimation with initialisation of the vector search, e.g. estimating a good candidate to initiate…
H04N 19/593
Using predictive coding: involving spatial prediction techniques

Family

PCT/FI2011/050926Parent of this continuation · filed 21 Oct 2011
US 2018/0288432 A1Pre-grant publication · published 4 Oct 2018
Application14/352,913Parent of this continuation
US 9,992,511 B2Parent of this continuation
US 2015/0163508 A1Published application
US 11,122,289 B2This patent

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

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