US 2025/0063171 A1 · Context Adaptive Interpolation Filter

Abstract

This disclosure relates generally to video coding and particularly to methods and systems for deriving context adaptive interpolation filter used for generating prediction samples in inter prediction involving a fractional motion vector or block vector. For example, an encoder and a decoder may derive interpolation filters adaptively using reconstructed samples. The reconstructed samples may belong to templates near a current block and a reference block related by the motion vector or block vector. The derivation of the adaptive interpolation filters may be based on minimizing distortions between interpolated templates associated with the reference block and the templates associated with the current block.

Claims20

Dependent claims

A method for decoding a current block in a video bitstream, the method comprising:

receiving from the video bitstream a vector identifying a reference block for the current block;
determining a first set of reconstructed samples in a first neighboring template of the current block;
determining a second set of reconstructed samples in a second neighboring template of the reference block;
determining whether at least one adaptive interpolation filter is applied for the current block;
and
in response to the at least one adaptive interpolation filter being applied:
deriving the at least one adaptive interpolation filter based on the first set of reconstructed samples and the second set of reconstructed samples;
and
predicting samples in the current block at least by applying the derived at least one adaptive interpolation filter to the reference block.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/497,697Filed 30 Oct 2023

Priority

17 Aug 2023

Published

20 Feb 2025

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

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 19/117
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: filters, e.g. for pre-processing or…
H04N 19/176
The unit being an image region, e.g. an object: the region being a block, e.g. a macroblock

Context Adaptive Interpolation Filter

Life of this patent

Context Adaptive Interpolation Filter

Life of this patent

Abstract

Claims20