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Flag indication method in intra block copy mode

A technology of internal copying and mode, applied in the direction of digital video signal modification, electrical components, image communication, etc., can solve the problem of digital video occupying bandwidth and other problems

Pending Publication Date: 2021-07-23
BEIJING BYTEDANCE NETWORK TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Despite advances in video compression, digital video still accounts for the largest bandwidth usage on the Internet and other digital communication networks

Method used

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  • Flag indication method in intra block copy mode
  • Flag indication method in intra block copy mode
  • Flag indication method in intra block copy mode

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0356] Example 1. CPR is not allowed when using affine motion compensation.

[0357] (a) In one example, a coherent bitstream cannot use both CPR and affine motion compensation in a single block.

[0358] (b) In one example, during parsing, a block-level affine enable / disable flag may first be signaled. When using the affine mode to encode and decode a block, there is no need to signal whether the reference picture index of the current block is equal to the reference picture index associated with the current picture.

[0359] (c) Alternatively, the reference picture index may be signaled before the block-level affine enable / disable flag. The signaling of the affine flag is always skipped when the block uses CPR.

[0360] (d) Alternatively, the reference picture index may be signaled before the block-level affine enable / disable flag. When a block is coded with bidirectional prediction and only one reference picture is the current reference picture, the affine flag can stil...

example 2

[0362] Example 2. Blocks cannot inherit an affine model from neighboring blocks using CPR.

[0363] (a) In one example, neighboring blocks using CPR cannot be used to derive affine merge candidates in the sub-block merge candidate list.

[0364] (i) In one example, neighboring blocks using CPR are considered unavailable during subblock merge candidate list construction.

[0365] (b) In one example, neighboring blocks using CPR cannot be used to derive affine AMVP candidates in the affine AMVP list.

[0366] (i) In one example, neighboring blocks using CPR are treated as unavailable during Affine AMVP candidate list construction.

example 3

[0367] Example 3. Whether a block can inherit an affine model from neighboring blocks using CPR can depend on the reference list.

[0368] (a) In one example, assuming that neighboring blocks apply bidirectional prediction, the reference picture in the reference list X (X can be 0 or 1) is the current picture, and the reference picture in the reference list (1-X) is the current picture picture, then

[0369] (i) Motion information of neighboring blocks referring to the reference list X cannot be used to derive affine merge candidates in the sub-block merge candidate list.

[0370] (1) In one example, motion information of neighboring blocks referring to the reference list (1-X) may be used to derive affine merge candidates in the sub-block merge candidate list.

[0371] (ii) Motion information of neighboring blocks referring to the reference list X cannot be used to derive affine AMVP candidates in the affine AMVP list.

[0372] (1) For example, motion information of neigh...

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PUM

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Abstract

The present disclosure relates to flag indication method in an intra block copy mode. A method for video processing is provided, including determining whether an intra block copy (IBC) mode, in which at least one reference picture used by the current video block is identical to a picture in which the current video block is located, is applied for the current video block; signaling whether the IBC mode is applied for the current video block; refraining from signaling flags for a group of prediction modes based on determining that the IBC mode is applied for the current video block; and performing the conversion for the current video block based on the application of the IBC mode.

Description

[0001] Cross References to Related Applications [0002] This application claims priority and benefit from International Patent Application No. PCT / CN2018 / 118167 filed on November 29, 2018. The entire disclosure content of International Patent Application No. PCT / CN2018 / 118167 is incorporated by reference as a part of the disclosure content of the present application. technical field [0003] This patent document relates to video codec technology, device and system. Background technique [0004] Despite advances in video compression, digital video still accounts for the largest bandwidth usage on the Internet and other digital communication networks. The bandwidth requirements used by digital video are expected to continue to grow as the number of connected user devices capable of receiving and displaying video increases. Contents of the invention [0005] Devices, systems, and methods are described that relate to digital video codecs, and in particular to motion vector ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/50
CPCH04N19/109H04N19/159H04N19/176H04N19/70H04N19/52H04N19/54H04N19/184H04N19/593H04N19/51
Inventor 张凯张莉刘鸿彬王悦
Owner BEIJING BYTEDANCE NETWORK TECH CO LTD