WO2018045207A1 - Cross-component filter - Google Patents

Cross-component filter Download PDF

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Publication number
WO2018045207A1
WO2018045207A1 PCT/US2017/049688 US2017049688W WO2018045207A1 WO 2018045207 A1 WO2018045207 A1 WO 2018045207A1 US 2017049688 W US2017049688 W US 2017049688W WO 2018045207 A1 WO2018045207 A1 WO 2018045207A1
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WO
WIPO (PCT)
Prior art keywords
component
sample
samples
parameter
current
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/US2017/049688
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English (en)
French (fr)
Other versions
WO2018045207A9 (en
Inventor
Yi-Wen Chen
Wei-Jung Chien
Li Zhang
Hsiao-Chiang Chuang
Marta Karczewicz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Qualcomm Inc
Original Assignee
Qualcomm Inc
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 Qualcomm Inc filed Critical Qualcomm Inc
Priority to CN201780052096.8A priority Critical patent/CN109691102B/zh
Priority to EP17765027.2A priority patent/EP3507984B1/en
Priority to BR112019003603-2A priority patent/BR112019003603B1/pt
Priority to JP2019510909A priority patent/JP2019525679A/ja
Priority to KR1020197005069A priority patent/KR20190042579A/ko
Publication of WO2018045207A1 publication Critical patent/WO2018045207A1/en
Anticipated expiration legal-status Critical
Publication of WO2018045207A9 publication Critical patent/WO2018045207A9/en
Ceased legal-status Critical Current

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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
    • H04N19/102—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
    • H04N19/117—Filters, e.g. for pre-processing or post-processing
    • 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
    • H04N19/124—Quantisation
    • 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
    • H04N19/182—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 pixel
    • 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
    • H04N19/513—Processing of motion vectors
    • 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
    • H04N19/60—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding
    • H04N19/63—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets
    • H04N19/635—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using transform coding using sub-band based transform, e.g. wavelets characterised by filter definition or implementation details
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • 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
    • H04N19/80—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation
    • H04N19/82—Details of filtering operations specially adapted for video compression, e.g. for pixel interpolation involving filtering within a prediction loop

Definitions

  • FIG. 5A is a schematic diagram of generation of corresponding cross-component pixels according to examples of this disclosure.
  • An initial pixel value for a current pixel P c may be modified by the video decoder to a modified pixel P' c according to a predefined linear or non-linear relation between the current pixel and its spatial neighboring pixels and at least one corresponding pixels in the at least one other components.
  • the video decoder receives encoded video data that includes the filter information, decodes the video data, and applies filtering based on the filtering information. In this way, the video decoder may apply the same filtering that was applied at the video encoder.
  • communication medium may include routers, switches, base stations, or any other equipment that may be useful to facilitate communication from source device 12 to destination device 14.
  • output interface 22 may output encoded data to a storage device 26.
  • input interface 26 may access encoded data from storage device 26.
  • Storage device 26 may include any of a variety of distributed or locally accessed data storage media such as a hard drive, Blu-ray discs, DVDs, CD-ROMs, flash memory, volatile or non-volatile memory, or any other suitable digital storage media for storing encoded video data.
  • storage device 26 may correspond to a file server or another intermediate storage device that may hold the encoded video generated by source device 12.
  • Destination device 14 may access stored video data from storage device 26 via streaming or download.
  • the file server may be any type of server capable of storing encoded video data and transmitting that encoded video data to the destination device 14.
  • FIGS. 3A-3C illustrate the ones shown in FIGS. 3A-3C.
  • FIG. 3 A illustrates a 5x5 diamond
  • FIG. 3B illustrates a 7x7 diamond
  • FIG. 3C illustrates a truncated 9x9 diamond.
  • the examples in FIGS. 3A-3C are diamond shapes, however other shapes may be used.
  • the center pixel in the filter mask is the pixel that is being filtered.
  • the filtered pixel may be offset from the center of the filter mask.
  • a single set of ALF coefficients is applied to each of the chroma components in a picture.
  • the 5x5 diamond shape filter is always used.
  • a CCLM luma-to-chroma prediction mode is added as one additional chroma intra prediction mode.
  • one more rate/distortion cost check for chroma components is added for selecting the optimal chroma intra prediction mode.
  • CCLM Cb-to-Cr prediction is used to enhance the Cr component prediction.
  • FIGS. 5A and 5B are schematic diagrams of generation of correspondent cross- component pixels for 4:2:0 color format (FIG. 5A), use of upper and bottom luma pixels (FIG. 5B), and use of six surrounding luma pixels.
  • the luma pixels located immediately at the upper and bottom of the current chroma pixel may be used to generate a virtual luma pixel using a predefined weighting factors (e.g. 1 ⁇ 2 and 1 ⁇ 2) as shown in FIG. 5 A.
  • a predefined weighting factors e.g. 1 ⁇ 2 and 1 ⁇ 2
  • the initial pixel value of current pixel P c may be modified to P' c according to the predefined linear or non-linear relation between the current pixel and its spatial neighboring pixels and at least one corresponding pixels in the at least one other components.
  • Parameters, such as a and ⁇ , used in such relations may be derived in various ways.
  • w 2 (n) is a weight assigned to the n-th pixel of a set of pixels that includes the current pixel and one or more neighboring pixels of the same color component as the current pixel.
  • the weight assigned to the current pixel is greater than weights assigned to the neighboring pixels of the same color component as the current pixel.
  • Motion compensation unit 916 determines prediction information for a video block of the current slice by parsing the motion vectors and other syntax elements, and uses the prediction information to produce the predictive blocks for the current video block being decoded. For example, motion compensation unit 916 uses some of the received syntax elements to determine a prediction mode (e.g., intra- or inter-prediction) used to code the video blocks of the slice, an inter-prediction slice type (e.g., B slice or P slice), construction information for one or more of the reference picture lists for the slice, motion vectors for each inter-encoded video block of the slice, inter-prediction status for each inter-coded video block of the slice, and other information to decode the video blocks in the current slice.
  • a prediction mode e.g., intra- or inter-prediction
  • an inter-prediction slice type e.g., B slice or P slice
  • construction information for one or more of the reference picture lists for the slice motion vectors for each inter-encoded video block of the slice, inter-prediction status for
  • the plurality of cross-component samples For each respective neighbor sample in the plurality of neighbor samples, the plurality of cross-component samples includes a sample in the second component corresponding to the respective neighbor sample, the plurality of cross-component samples further includes a sample in the second component corresponding to the current sample.

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Compression Or Coding Systems Of Tv Signals (AREA)
PCT/US2017/049688 2016-08-31 2017-08-31 Cross-component filter Ceased WO2018045207A1 (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
CN201780052096.8A CN109691102B (zh) 2016-08-31 2017-08-31 跨分量滤波器
EP17765027.2A EP3507984B1 (en) 2016-08-31 2017-08-31 Cross-component filter
BR112019003603-2A BR112019003603B1 (pt) 2016-08-31 2017-08-31 Método e dispositivo para codificar dados de vídeo, e memória
JP2019510909A JP2019525679A (ja) 2016-08-31 2017-08-31 クロス成分フィルタ
KR1020197005069A KR20190042579A (ko) 2016-08-31 2017-08-31 크로스-컴포넌트 필터

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US201662381978P 2016-08-31 2016-08-31
US62/381,978 2016-08-31
US15/691,287 2017-08-30
US15/691,287 US10419757B2 (en) 2016-08-31 2017-08-30 Cross-component filter

Publications (2)

Publication Number Publication Date
WO2018045207A1 true WO2018045207A1 (en) 2018-03-08
WO2018045207A9 WO2018045207A9 (en) 2019-03-21

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US (1) US10419757B2 (https=)
EP (1) EP3507984B1 (https=)
JP (1) JP2019525679A (https=)
KR (1) KR20190042579A (https=)
CN (1) CN109691102B (https=)
WO (1) WO2018045207A1 (https=)

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