US 2022/0286684 A1 · ENCODER, A DECODER AND CORRESPONDING METHODS OF FILTER MODIFICATION ON GENERAL INTRA PREDICTION PROCESS

Abstract

The general intra prediction process is unnecessarily complicated with inclusion of the reference sample filtering. This application provides solutions for this problem. A method for intra prediction is provided. The method includes: during an intra predicted sample generation stage, obtaining a filtering indication, which indicates whether a filtered value or an unfiltered value of reference samples of the current coding block will be used. When the value of the filtering indication is true, a prediction sample is generated by using the filtered value of the reference samples based on the planar mode. When the value of the filtering indication is false, a prediction sample is generated by using the unfiltered value of the reference samples based on the planar mode. As a result, the reference sample filtering stage can be fully removed or can be combined with other stage.

Claims18

Dependent claims

A method for intra prediction, comprising:

during an intra predicted sample generation stage, obtaining a filtering indication indicating whether a filtered value or an unfiltered value of reference samples of a current coding block is to be used;
in response to determining that a value of the filtering indication is true, generating a prediction sample by using the filtered value of the reference samples based on a planar mode;
or
in response to determining that the value of the filtering indication is false, generating a prediction sample by using the unfiltered value of the reference samples based on the planar mode.

1 more element

A decoder, comprising:

one or more processors;
and
a non-transitory computer-readable storage medium coupled to the one or more processors and storing programming instructions for execution by the one or more processors, wherein the programming instructions, when executed by the one or more processors, cause the decoder to perform operations comprising:
during a position-dependent intra prediction (PDPC) stage, obtaining a filtering indication indicating whether a filtered value or an unfiltered value of reference samples of a current coding block is to be used;
in response to determining that a value of the filtering indication is true, generating an output sample by using the filtered value of the reference samples;
or
in response to determining that the value of the filtering indication is false, generating an output sample by using the unfiltered value of the reference samples.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application

17/684,224Filed 1 Mar 2022

Priority

WO PCT/EP2019/0733702 Sep 2019

Published

8 Sep 2022

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 19/117
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: filters, e.g. for pre-processing or…
H04N 19/132
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: sampling, masking or truncation of coding…
H04N 19/105
Selection of coding mode or of prediction mode: selection of the reference unit for prediction within a chosen coding or prediction mode, e.g.…
H04N 19/159
Assigned coding mode, i.e. the coding mode being predefined or preselected to be further used for selection of another element or parameter:…

Encoder, a decoder and corresponding methods of filter modification on general intra prediction process

Life of this patent

Encoder, a decoder and corresponding methods of filter modification on general intra prediction process

Life of this patent

Abstract

Claims18