SG11201403454PA - Video image decoding device, video image and coding device, video image decoding method and video image coding method - Google Patents

Video image decoding device, video image and coding device, video image decoding method and video image coding method

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Publication number
SG11201403454PA
SG11201403454PA SG11201403454PA SG11201403454PA SG11201403454PA SG 11201403454P A SG11201403454P A SG 11201403454PA SG 11201403454P A SG11201403454P A SG 11201403454PA SG 11201403454P A SG11201403454P A SG 11201403454PA SG 11201403454P A SG11201403454P A SG 11201403454PA
Authority
SG
Singapore
Prior art keywords
video image
coding
image decoding
decoding device
decoding method
Prior art date
Application number
SG11201403454PA
Inventor
Akira Minezawa
Kazuo Sugimoto
Kazuyuki Miyazawa
Yusuke Itani
Ryoji Hattori
Yoshimi Moriya
Norimichi Hiwasa
Shunichi Sekiguchi
Tokumichi Murakami
Original Assignee
Mitsubishi Electric Corp
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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of SG11201403454PA publication Critical patent/SG11201403454PA/en

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/117Filters, e.g. for pre-processing or post-processing
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/85Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression
    • H04N19/86Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using pre-processing or post-processing specially adapted for video compression involving reduction of coding artifacts, e.g. of blockiness
    • GPHYSICS
    • G06COMPUTING; CALCULATING OR COUNTING
    • G06TIMAGE DATA PROCESSING OR GENERATION, IN GENERAL
    • G06T9/00Image coding
    • G06T9/40Tree coding, e.g. quadtree, octree
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/103Selection of coding mode or of prediction mode
    • H04N19/107Selection of coding mode or of prediction mode between spatial and temporal predictive coding, e.g. picture refresh
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/119Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/13Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/102Methods 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
    • H04N19/132Sampling, masking or truncation of coding units, e.g. adaptive resampling, frame skipping, frame interpolation or high-frequency transform coefficient masking
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/10Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using adaptive coding
    • H04N19/169Methods 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
    • H04N19/17Methods 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
    • H04N19/176Methods 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
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/44Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/80Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/91Entropy coding, e.g. variable length coding [VLC] or arithmetic coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/50Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/593Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding involving spatial prediction techniques
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/60Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/61Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding in combination with predictive coding
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04NPICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N19/00Methods or arrangements for coding, decoding, compressing or decompressing digital video signals
    • H04N19/90Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using coding techniques not provided for in groups H04N19/10-H04N19/85, e.g. fractals
    • H04N19/96Tree coding, e.g. quad-tree coding

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
SG11201403454PA 2012-01-19 2013-01-09 Video image decoding device, video image and coding device, video image decoding method and video image coding method SG11201403454PA (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2012009128 2012-01-19
PCT/JP2013/050207 WO2013108684A1 (en) 2012-01-19 2013-01-09 Video image decoding device, video image and coding device, video image decoding method and video image coding method

Publications (1)

Publication Number Publication Date
SG11201403454PA true SG11201403454PA (en) 2014-08-28

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SG10201912254WA SG10201912254WA (en) 2012-01-19 2013-01-09 Image decoding device, image encoding device, image decoding method, and image encoding method
SG10201604926WA SG10201604926WA (en) 2012-01-19 2013-01-09 Image decoding device, image encoding device, image decoding method, and image encoding method
SG10201906914WA SG10201906914WA (en) 2012-01-19 2013-01-09 Image decoding device, image encoding device, image decoding method, and image encoding method
SG11201403454PA SG11201403454PA (en) 2012-01-19 2013-01-09 Video image decoding device, video image and coding device, video image decoding method and video image coding method
SG10201912258SA SG10201912258SA (en) 2012-01-19 2013-01-09 Image decoding device, image encoding device, image decoding method, and image encoding method

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US (1) US20150023420A1 (en)
EP (1) EP2806639A4 (en)
JP (4) JP5551837B2 (en)
KR (6) KR102021257B1 (en)
CN (1) CN104067623A (en)
BR (1) BR112014016291A8 (en)
CA (3) CA2862805C (en)
HK (1) HK1199589A1 (en)
IN (1) IN2014CN04356A (en)
MX (1) MX2014008781A (en)
RU (5) RU2577320C1 (en)
SG (5) SG10201912254WA (en)
TW (4) TWI608728B (en)
WO (1) WO2013108684A1 (en)

Families Citing this family (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP6034010B2 (en) * 2011-10-24 2016-11-30 ソニー株式会社 Encoding apparatus, encoding method, and program
KR102276914B1 (en) * 2013-10-24 2021-07-13 삼성전자주식회사 Video encoding devic and driving method thereof
EP3104614A4 (en) * 2014-02-03 2017-09-13 Mitsubishi Electric Corporation Image encoding device, image decoding device, encoded stream conversion device, image encoding method, and image decoding method
WO2015151791A1 (en) * 2014-03-31 2015-10-08 ソニー株式会社 Image decoding device and method
US10057574B2 (en) * 2015-02-11 2018-08-21 Qualcomm Incorporated Coding tree unit (CTU) level adaptive loop filter (ALF)
KR20180050333A (en) 2015-09-29 2018-05-14 엘지전자 주식회사 Filtering method and apparatus in video coding system
JP6634936B2 (en) * 2016-04-05 2020-01-22 富士通株式会社 Image encoding device, image encoding method, image encoding program, image decoding device, image decoding method, image decoding program, and image transmission system
US10694202B2 (en) * 2016-12-01 2020-06-23 Qualcomm Incorporated Indication of bilateral filter usage in video coding
CN110537122B (en) 2017-02-23 2022-04-29 奇跃公司 Variable-focus virtual image device based on polarization conversion
US11057619B2 (en) 2019-03-23 2021-07-06 Lg Electronics Inc. Image coding method and apparatus based on intra prediction using MPM list
US10764507B1 (en) 2019-04-18 2020-09-01 Kneron (Taiwan) Co., Ltd. Image processing system capable of generating a snapshot image with high image quality by using a zero-shutter-lag snapshot operation
US10708624B1 (en) * 2019-05-30 2020-07-07 Ati Technologies Ulc Pre-processing for video compression
US11431971B2 (en) * 2019-06-24 2022-08-30 Industrial Technology Research Institute Method and image processing apparatus for video coding
CN115589484A (en) * 2019-12-06 2023-01-10 杭州海康威视数字技术股份有限公司 Filtering method, device and equipment
CN113808157B (en) * 2021-11-18 2022-02-22 腾讯科技(深圳)有限公司 Image processing method and device and computer equipment
CN116385414B (en) * 2023-04-10 2023-11-07 哈尔滨耐是智能科技有限公司 Component multi-scale defect feature extraction method, computing device and storage medium

Family Cites Families (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
TW256896B (en) * 1991-07-19 1995-09-11 Sony Co Ltd
AU717480B2 (en) * 1998-08-01 2000-03-30 Korea Advanced Institute Of Science And Technology Loop-filtering method for image data and apparatus therefor
JP3639517B2 (en) * 2000-10-04 2005-04-20 三洋電機株式会社 Moving picture decoding apparatus and moving picture decoding method
JP4114494B2 (en) * 2002-03-07 2008-07-09 セイコーエプソン株式会社 Image processing apparatus, image processing program, and image processing method
JP4361435B2 (en) * 2004-07-14 2009-11-11 株式会社エヌ・ティ・ティ・ドコモ Moving picture decoding method, moving picture decoding program, moving picture decoding apparatus, moving picture encoding method, moving picture encoding program, and moving picture encoding apparatus
EP1881707A4 (en) * 2005-04-13 2009-11-04 Ntt Docomo Inc Dynamic image encoding device, dynamic image decoding device, dynamic image encoding method, dynamic image decoding method, dynamic image encoding program, and dynamic image decoding program
KR100745765B1 (en) * 2006-04-13 2007-08-02 삼성전자주식회사 Apparatus and method for intra prediction of an image data, apparatus and method for encoding of an image data, apparatus and method for intra prediction compensation of an image data, apparatus and method for decoding of an image data
BRPI0714233A2 (en) 2006-07-18 2013-01-15 Thomson Licensing Methods and apparatus for adaptive reference filtering
RU2427976C2 (en) * 2006-07-28 2011-08-27 Кабусики Кайся Тосиба Method and device for coding and decoding of image
JP4931214B2 (en) * 2007-01-24 2012-05-16 キヤノン株式会社 Image processing apparatus and method
CN101677400B (en) * 2008-09-19 2012-08-15 华为技术有限公司 Coding and decoding method, coder, decoder and encoder/decoder system
JP2010130522A (en) * 2008-11-28 2010-06-10 Canon Inc Moving image encoding device and moving image encoding method
US20110122140A1 (en) * 2009-05-19 2011-05-26 Yoshiteru Kawasaki Drawing device and drawing method
WO2010137322A1 (en) * 2009-05-29 2010-12-02 三菱電機株式会社 Image encoder, image decoder, image encoding method and image decoding method
KR20110001990A (en) * 2009-06-30 2011-01-06 삼성전자주식회사 Apparatus and metohd of in loop filtering an image data and encoding/decoding apparatus using the same
US20110194613A1 (en) * 2010-02-11 2011-08-11 Qualcomm Incorporated Video coding with large macroblocks
US8995527B2 (en) * 2010-02-19 2015-03-31 Qualcomm Incorporated Block type signalling in video coding
WO2011113282A1 (en) * 2010-03-15 2011-09-22 Mediatek Singapore Pte. Ltd. Localized in-loop filtering with multiple filters in hybrid video coding
KR101750046B1 (en) * 2010-04-05 2017-06-22 삼성전자주식회사 Method and apparatus for video encoding with in-loop filtering based on tree-structured data unit, method and apparatus for video decoding with the same
SG10202001623RA (en) * 2010-04-09 2020-04-29 Mitsubishi Electric Corp Moving image encoding device and moving image decoding device
WO2011128268A1 (en) * 2010-04-13 2011-10-20 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Probability interval partioning encoder and decoder
TWI508534B (en) * 2010-05-18 2015-11-11 Sony Corp Image processing apparatus and image processing method
JPWO2011158657A1 (en) * 2010-06-17 2013-08-19 シャープ株式会社 Image filter device, decoding device, encoding device, and data structure
US20120029435A1 (en) * 2010-07-30 2012-02-02 Miriam Gutierrez Del Rio Ng/og support systems
US9055305B2 (en) * 2011-01-09 2015-06-09 Mediatek Inc. Apparatus and method of sample adaptive offset for video coding
EP3220641B1 (en) * 2011-04-21 2019-01-02 HFI Innovation Inc. Method and apparatus for improved in-loop filtering
US9008170B2 (en) * 2011-05-10 2015-04-14 Qualcomm Incorporated Offset type and coefficients signaling method for sample adaptive offset
US20120294353A1 (en) * 2011-05-16 2012-11-22 Mediatek Inc. Apparatus and Method of Sample Adaptive Offset for Luma and Chroma Components
BR122021004576B1 (en) * 2011-06-28 2022-07-26 Samsung Electronics Co., Ltd VIDEO DECODING DEVICE
US20130013616A1 (en) * 2011-07-08 2013-01-10 Jochen Lothar Leidner Systems and Methods for Natural Language Searching of Structured Data
US9386305B2 (en) * 2011-11-28 2016-07-05 Qualcomm Incorporated Largest coding unit (LCU) or partition-based syntax for adaptive loop filter and sample adaptive offset in video coding

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RU2616598C1 (en) 2017-04-18
KR102113985B1 (en) 2020-05-22
IN2014CN04356A (en) 2015-09-04
TWI489837B (en) 2015-06-21
SG10201912254WA (en) 2020-02-27
CA2862805A1 (en) 2013-07-25
JP2014187704A (en) 2014-10-02
WO2013108684A1 (en) 2013-07-25
TWI586148B (en) 2017-06-01
KR20190105135A (en) 2019-09-11
KR20170098967A (en) 2017-08-30
EP2806639A1 (en) 2014-11-26
JP2017092980A (en) 2017-05-25
HK1199589A1 (en) 2015-07-03
RU2577320C1 (en) 2016-03-20
CA2862805C (en) 2019-02-12
TW201731292A (en) 2017-09-01
TWI665908B (en) 2019-07-11
EP2806639A4 (en) 2016-06-01
JP5551837B2 (en) 2014-07-16
CN104067623A (en) 2014-09-24
SG10201906914WA (en) 2019-09-27
SG10201912258SA (en) 2020-02-27
JP5815795B2 (en) 2015-11-17
KR20200108111A (en) 2020-09-16
TW201808007A (en) 2018-03-01
KR20140111039A (en) 2014-09-17
MX2014008781A (en) 2014-10-23
TWI608728B (en) 2017-12-11
TW201534108A (en) 2015-09-01
RU2703229C1 (en) 2019-10-15
KR20180123191A (en) 2018-11-14
SG10201604926WA (en) 2016-08-30
KR101647242B1 (en) 2016-08-09
RU2684570C1 (en) 2019-04-09
BR112014016291A2 (en) 2017-06-13
KR102157481B1 (en) 2020-09-18
KR102272564B1 (en) 2021-07-02
CA2961818C (en) 2020-06-09
RU2658178C1 (en) 2018-06-19
KR102021257B1 (en) 2019-09-11
JP2015228709A (en) 2015-12-17
JP6082073B2 (en) 2017-02-15
JPWO2013108684A1 (en) 2015-05-11
US20150023420A1 (en) 2015-01-22
BR112014016291A8 (en) 2017-07-04
CA3001027A1 (en) 2013-07-25
TW201342934A (en) 2013-10-16
KR20140117557A (en) 2014-10-07
CA2961818A1 (en) 2013-07-25

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