US 2024/0196013 A1 · BLOCK SIZE BASED TRANSFORM RESTRICTIONS

Abstract

A coding unit having a size multiple of three in horizontal or vertical direction is coded through one of several embodiments. In one embodiment, for some block sizes, the coding unit is coded and decoded systematically through SKIP mode. In another embodiment, the coding units can be coded in SKIP mode or with a DC coefficient. In another embodiment, an asymmetric division of a common coding unit parent is performed and transform coefficients are factorized among at least two sub-blocks to encode a coding unit. In another embodiment, a separable two dimensional transform can be applied by applying a transform over the block in one direction, and using two one-dimensional transforms on sub-blocks in the other direction to code. Methods, apparatus, and signal embodiments are provided for encoding and decoding.

Claims18

Dependent claims

A method (1500) for coding a block of video data, comprising:

dividing (1510) said block into at least two rectangular sub-blocks;
and
encoding (1520) said sub-blocks using processing comprising:
encoding a sub-block having size that is three times a power-of-two in width or height with a residual made of a single discrete cosine transform, DCT, coefficient, which is the DC coefficient of the DCT;
and
transforming sub-blocks not having a size that is three times a power-of-two in width or height.

3 more elements

A method (1700) for decoding a block of video data, comprising:

reconstructing (1710) a sub-block having size that is three times a power-of-two in width or height, using processing comprising using a single discrete cosine transform, DCT, coefficient for said sub-block having size that is three times a power-of-two in width or height, wherein the DCT coefficient is the DC coefficient of the DCT;
and
inverse transforming sub-blocks not having a size that is three times a power of two in width or height.

An apparatus (1900) for decoding a block of video data, comprising:

a memory (1920), and
a processor (1910), configured to:
reconstruct a sub-block having size that is three times a power-of-two in width or height, using processing comprising using a single discrete cosine transform, DCT, coefficient for said sub-block having size that is three times a power-of-two in width or height, wherein the DCT coefficient is the DC coefficient of the DCT;
and
inverse transform sub-blocks not having a size that is three times a power of two in width or height.

2 more elements

Dependencies are inferred from the claim text.

Facts

Application

18/539,475Filed 14 Dec 2023

Priority

EP 17305036.011 Jan 2017

Published

13 Jun 2024

Term ends

Not estimatedThe source records don’t support an estimate.

Classification8 codes

H04N 19/122
Selection from among a plurality of transforms or standards, e.g. selection between discrete cosine transform [DCT] and sub-band transform or…:…
H04N 19/61
Using transform coding: in combination with predictive 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 19/119
Characterised by the element, parameter or selection affected or controlled by the adaptive coding: adaptive subdivision aspects, e.g. subdivision…

Family

Application16/477,021Continuation · filed 10 Jul 2019

Application17/381,283Continuation · filed 21 Jul 2021

Application18/539,475Continuation

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

Block size based transform restrictions

Life of this patent

Block size based transform restrictions

Life of this patent

Abstract

Claims18