US 2017/0302929 A1 · NON-LOCAL ADAPTIVE LOOP FILTER

Abstract

Aspects of the disclosure provide a method for denoising a reconstructed picture. The method can include receiving reconstructed video data corresponding to a picture, dividing the picture into current patches, forming patch groups each including a current patch and a number of reference patches that are similar to the current patch, denoising the patch groups to modify pixel values of the patch groups to create a filtered picture, and generating a reference picture based on the filtered picture for encoding or decoding a picture. The operation of denoising the patch groups includes deriving a variance of compression noise in the respective patch group based on a compression noise model. A selection of model parameters is determined based on coding unit level information.

Claims25

Dependent claims

A method, comprising:

receiving reconstructed video data corresponding to a picture;
dividing the picture into current patches;
forming patch groups each including a current patch and a number of reference patches that are similar to the current patch;
denoising the patch groups to modify pixel values of the patch groups to create a filtered picture, wherein denoising the patch groups includes deriving a variance of compression noise in the respective patch group based on a compression noise model and a selection of model parameters is determined based on coding unit level information;
and
generating a reference picture based on the filtered picture for encoding or decoding a picture.

3 more elements

A method, comprising:

receiving reconstructed video data corresponding to a picture having a first color component and a second color component;
dividing pixels of the first color component in the picture into first current patches;
dividing pixels of the second color component in the picture into second current patches;
searching for similar first reference patches in the picture for a respective first current patch to form first patch groups corresponding to the first current patches;
and
using motion vectors of the similar first reference patches of the respective first current patch to search for similar second reference patches in the picture for a respective second current patch.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

15/485,694Filed 12 Apr 2017

Priority

14 Apr 2016

Published

19 Oct 2017

Term ends

Not estimatedThe source records don’t support an estimate.

Classification11 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 19/107
Selection of coding mode or of prediction mode: between spatial and temporal predictive coding, e.g. picture refresh
H04N 19/126
Quantisation: details of normalisation or weighting functions, e.g. normalisation matrices or variable uniform quantisers
H04N 19/139
Motion inside a coding unit, e.g. average field, frame or block difference: analysis of motion vectors, e.g. their magnitude, direction, variance…

Non-local adaptive loop filter

Life of this patent

Non-local adaptive loop filter

Life of this patent

Abstract

Claims25