WO2015176225A1 - Procédés de recherche de copie intra-bloc améliorée - Google Patents

Procédés de recherche de copie intra-bloc améliorée Download PDF

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Publication number
WO2015176225A1
WO2015176225A1 PCT/CN2014/077862 CN2014077862W WO2015176225A1 WO 2015176225 A1 WO2015176225 A1 WO 2015176225A1 CN 2014077862 W CN2014077862 W CN 2014077862W WO 2015176225 A1 WO2015176225 A1 WO 2015176225A1
Authority
WO
WIPO (PCT)
Prior art keywords
ibc
symmetric
block
hash
candidates
Prior art date
Application number
PCT/CN2014/077862
Other languages
English (en)
Inventor
Kai Zhang
Jicheng An
Xianguo Zhang
Han HUANG
Original Assignee
Mediatek Singapore Pte. Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mediatek Singapore Pte. Ltd. filed Critical Mediatek Singapore Pte. Ltd.
Priority to PCT/CN2014/077862 priority Critical patent/WO2015176225A1/fr
Priority to US14/660,196 priority patent/US9860559B2/en
Publication of WO2015176225A1 publication Critical patent/WO2015176225A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/17—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object
    • H04N19/176—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being an image region, e.g. an object the region being a block, e.g. a macroblock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or selection affected or controlled by the adaptive coding
    • H04N19/103—Selection of coding mode or of prediction mode
    • H04N19/105—Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/134—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the element, parameter or criterion affecting or controlling the adaptive coding
    • H04N19/146—Data rate or code amount at the encoder output
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding
    • H04N19/186—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding characterised by the coding unit, i.e. the structural portion or semantic portion of the video signal being the object or the subject of the adaptive coding the unit being a colour or a chrominance component
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/503—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving temporal prediction
    • H04N19/51—Motion estimation or motion compensation
    • H04N19/533—Motion estimation using multistep search, e.g. 2D-log search or one-at-a-time search [OTS]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques

Definitions

  • the invention relates generally to video/image processing.
  • the presented invention relates to block copying (BC).
  • Intra block copy was adopted to take advantage of reduplicated content in a picture.
  • a reference block in the current picture is copied to the current block as the prediction if IBC is applied.
  • the reference block is located by applying a block-copying vector (BV).
  • BV block-copying vector
  • JCTVC-Q0175 proposes a two-step searching method as depicted in Fig.2.
  • first step only the Luma components are involved in the sum of absolute difference (SAD) calculation.
  • second step Chroma components as well as Luma components are involved in the SAD calculation.
  • the best one in the N candidates is determined as the optimal BV for the current block.
  • JCTVC-Q0175 it does not check the BV equals to the BV prediction (BVP) in the first step.
  • JCTVC-Q0175 and JCTVC-Q0248 are not harmonized. In the hash-based method of JCTVC-Q0248, chroma components are not involved in the hash calculation. They are not involved in the SAD calculation either. 3. JCTVC-Q0175 and JCTVC-Q0248 are not harmonized with symmetric intra-block copy proposed by JCTVC-Q0082.
  • Fig. 1 is a diagram illustrating intra block copy
  • Fig. 7 is a diagram illustrating horizontal flip
  • chroma components are involved in the process of calculating the hash number.
  • symmetric IBC is considered in the hash-based searching process as depicted in Fig.6.
  • a reformed version of the current block is used to calculate a hash number.
  • BVs with the same hash block are chosen as candidates. Distortions for these candidates are calculated between the reference block and the reformed version of the current block.
  • the current block could be horizontal flipped or vertical flipped as depicted in Fig.7 and Fig. 8 respectively.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)

Abstract

L'invention concerne plusieurs procédés d'amélioration du processus de recherche de copie intra-bloc. Ces procédés permettent d'obtenir une approche de recherche en deux étapes plus efficace en termes de composantes de chrominance, ainsi qu'harmonisées avec le procédé basé sur le hachage. L'invention concerne également des procédés de recherche pour copie intra-bloc symétrique.
PCT/CN2014/077862 2014-03-17 2014-05-20 Procédés de recherche de copie intra-bloc améliorée WO2015176225A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/CN2014/077862 WO2015176225A1 (fr) 2014-05-20 2014-05-20 Procédés de recherche de copie intra-bloc améliorée
US14/660,196 US9860559B2 (en) 2014-03-17 2015-03-17 Method of video coding using symmetric intra block copy

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2014/077862 WO2015176225A1 (fr) 2014-05-20 2014-05-20 Procédés de recherche de copie intra-bloc améliorée

Publications (1)

Publication Number Publication Date
WO2015176225A1 true WO2015176225A1 (fr) 2015-11-26

Family

ID=54553183

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2014/077862 WO2015176225A1 (fr) 2014-03-17 2014-05-20 Procédés de recherche de copie intra-bloc améliorée

Country Status (1)

Country Link
WO (1) WO2015176225A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021138164A1 (fr) * 2020-01-03 2021-07-08 Intel Corporation Codage vidéo avec de multiples modes de copie intra-bloc

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100080285A1 (en) * 2008-09-26 2010-04-01 Qualcomm Incorporated Determining availability of video data units
CN102804775A (zh) * 2010-02-19 2012-11-28 斯凯普公司 用于视频的数据压缩

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20100080285A1 (en) * 2008-09-26 2010-04-01 Qualcomm Incorporated Determining availability of video data units
CN102804775A (zh) * 2010-02-19 2012-11-28 斯凯普公司 用于视频的数据压缩

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
LI, BIN ET AL.: "Hash-based motion search", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISOLIEC JTC 1/SC 29/WG 11 17TH MEETING, 1 April 2014 (2014-04-01), pages 1 - 2 *
PANG, CHAO ET AL.: "Intra block copy with encoder search using chroma component", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 17TH MEETING, 28 March 2014 (2014-03-28), pages 1 *
ZHANG, KAI ET AL.: "Symmetric intra block copy", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 17TH MEETING, 27 March 2014 (2014-03-27), pages 1 - 3 *
ZHANG, XIANGUO ET AL.: "Block vector prediction for intra block copy", JOINT COLLABORATIVE TEAM ON VIDEO CODING (JCT-VC) OF ITU-T SG 16 WP 3 AND ISO/IEC JTC 1/SC 29/WG 11 17TH MEETING, 26 March 2014 (2014-03-26), pages 1 - 2 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2021138164A1 (fr) * 2020-01-03 2021-07-08 Intel Corporation Codage vidéo avec de multiples modes de copie intra-bloc

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