WO2015096157A1 - Patterns of major color index map in palette coding - Google Patents

Patterns of major color index map in palette coding Download PDF

Info

Publication number
WO2015096157A1
WO2015096157A1 PCT/CN2013/090761 CN2013090761W WO2015096157A1 WO 2015096157 A1 WO2015096157 A1 WO 2015096157A1 CN 2013090761 W CN2013090761 W CN 2013090761W WO 2015096157 A1 WO2015096157 A1 WO 2015096157A1
Authority
WO
WIPO (PCT)
Prior art keywords
palette
coding
scanning
mode
level
Prior art date
Application number
PCT/CN2013/090761
Other languages
French (fr)
Inventor
Yi-Wen Chen
Yu-chen SUN
Xianguo Zhang
Tzu-Der Chuang
Yu-Wen Huang
Original Assignee
Mediatek 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 Mediatek Inc. filed Critical Mediatek Inc.
Priority to PCT/CN2013/090761 priority Critical patent/WO2015096157A1/en
Priority to PCT/CN2014/094036 priority patent/WO2015096647A1/en
Priority to CN201910487086.8A priority patent/CN110225345B/en
Priority to CN201480070568.9A priority patent/CN106063270A/en
Priority to US15/107,915 priority patent/US10542271B2/en
Priority to EP14874725.6A priority patent/EP3087743A4/en
Publication of WO2015096157A1 publication Critical patent/WO2015096157A1/en

Links

Classifications

    • 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
    • H04N19/129Scanning of coding units, e.g. zig-zag scan of transform coefficients or flexible macroblock ordering [FMO]
    • 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
    • H04N19/46Embedding additional information in the video signal during the compression process
    • H04N19/463Embedding additional information in the video signal during the compression process by compressing encoding parameters before transmission
    • 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
    • H04N19/90Methods 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
    • H04N19/93Run-length coding

Definitions

  • the invention relates generally to screen content video processing.
  • the present invention relates to methods for the major color -based coding (palette coding) method in HEVC range extensions (RExt) or screen content video codec.
  • HEVC High Efficiency Video Coding
  • palette coding (a.k.a. major color based coding) techniques represent block of pixels using indices to the palette (major colors), and encode the palette and the indices by exploiting spatial redundancy.
  • palette is utilized to represent a given video block (e.g. CU).
  • palette of each component are constructed and transmitted. All pixels within the given block are then coded using their palette indices.
  • each element in the palette is a triplet, representing a specific combination of the three color components.
  • the palette index. is shared by all the color components to reduce overhead.
  • palette_run e.g., M
  • palette_run e.g., M
  • a value “copy run” (e.g., N) is transmitted to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the row above.
  • palette coding Another major color-base coding (palette coding) method was proposed by Microsoft. Similar to [1], palette of each component are constructed and transmitted. However, the method of coding the palette index is different from the one proposed by Qualcomm. The following describes the procedure to code the palette indices in Microsoft's method.
  • pixels in a line are predicted individually. For each pixel, the left or above neighbours is used as predictor, and the prediction symbol is transmitted to the decoder.
  • Fig. 1 is a diagram illustrating horizontal scanning order to code the palette index
  • Fig. 2 is a diagram illustrating vertical scanning order to code the palette index
  • Fig. 3 is a diagram illustrating diagonal scanning order to code the palette index
  • Fig. 4 is a diagram illustrating inverse diagonal scanning order to code the palette index
  • Fig. 5 is a diagram illustrating the invented prediction mode of L shape. DETAILED DESCRIPTION
  • palette index coding mode (prediction mode) to improve the performance. Note that, when the neighboring palette index value which is used to predict current palette index is not available, a default value (e.g. zero) or a derived value based on the pixel value of the neighboring reconstructed pixels are used,
  • a value “copy_run” (e.g., N) is transmitted or derived to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the column left.
  • N could be 1.
  • the N could be the number of the remaining palette index which are not coded yet within the same line.
  • a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the palette index of the one that is at the transmitted or derived location,
  • a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
  • the signaling method can be adaptively determined.
  • the adaptive signalling method can be use different VLC code to signal mode according to the position of the current pixel.
  • Another adaptive signalling method can be turn off some modes according to the position of the current pixel.
  • the palette index of each pixel is scanned column by column vertically from top pixel to bottom pixel within one column. Besides, the scanning is started from the left most column to the right most column.
  • palette coding using vertical scanning order the "run” mode in Qualcomm's method can still be used and the "copy top” mode is modified as “copy left” mode accordingly.
  • the "normal” mode in Microsoft's method can still be the same and the "horizontal” and “vertical” are modified as “ copy left column” and “column filling” modes, respectively.
  • any invented scanning order along with the associated coding method could be used. If multiple scanning orders could be used for coding the palette index, additional syntax could be signaled to indicate which one is used for coding the palette index among the different scanning orders (horizontal scanning, vertical scanning, zig-zag scanning, Hilbert scanning and so on) and the associated coding method.
  • the selection of scanning order and the associated coding methods could also be implicitly derived at encoder and decoder sides through an identical derivation process without signaling any additional syntax. Note that, both explicit singaling and implicit deriving of the used scanning order could be done in PU level, CU level, slice level, picture level or sequence level.

Abstract

Methods of major color coding (palette coding) are disclosed. Several scanning patterns other than horizontal one could be used for coding the palette index (major color index). Additional coding method to predict the palette index are also disclosed to improve the coding efficiency of palette coding.

Description

PATTERNS OF MAJOR COLOR INDEX MAP IN PALETTE CODING
FIELD OF INVENTION
The invention relates generally to screen content video processing. In particular, the present invention relates to methods for the major color -based coding (palette coding) method in HEVC range extensions (RExt) or screen content video codec.
BACKGROUND OF THE INVENTION
The first version of High Efficiency Video Coding (HEVC) standard was finalized in January, 2013, which can achieve 40%~50% bitrate savings as compared to H.264/AVC for high-resolution applications. Currently, extensions of HEVC are being developed, including range extensions (RExt) which target on non-4 :2:0 color formats, such as 4:2:2 and 4:4:4, and higher bit-depths video such as 12, 14 and 16 bit-per-sample.
One of the mostly likely applications utilizing RExt is screen sharing, over wired- connection or wireless. Due to specific characteristics of screen-content, coding tools have been developed that demonstrated significant gains in coding efficiency. Among them, the palette coding (a.k.a. major color based coding) techniques represent block of pixels using indices to the palette (major colors), and encode the palette and the indices by exploiting spatial redundancy.
Palette coding [1] [2] [3]
In this first method, proposed by Qualcomm, palette is utilized to represent a given video block (e.g. CU). In the original version of the work [1], palette of each component are constructed and transmitted. All pixels within the given block are then coded using their palette indices.
Later on Qualcomm proposed a second version of their palette coding technique [2], in which each element in the palette is a triplet, representing a specific combination of the three color components. The palette index. is shared by all the color components to reduce overhead.
The following describes the procedure to code the palette indices in qualcomm' s method.
- Scan the CU in horizontal scan order (or so called raster scan order, horizontal direction in each line, from top line to bottom line, see figure 1 for reference)
- Signal palette index using one of the following 2 modes
o Run mode: signal "palette index" followed by "run"
In "run mode", a palette index is first signaled followed by "palette_run" (e.g., M). No further information needs to be transmitted for the current position and the following M positions as they have the same palette index as signaled,
o Copy top mode: Signal a "copy run"
In "copy above mode", a value "copy run" (e.g., N) is transmitted to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the row above.
Another major color-base coding (palette coding) method was proposed by Microsoft. Similar to [1], palette of each component are constructed and transmitted. However, the method of coding the palette index is different from the one proposed by Qualcomm. The following describes the procedure to code the palette indices in Microsoft's method.
- Scan the CU in horizontal scan order (or so called raster scan order, horizontal direction in each line, from top line to bottom line, see figure 1 for reference)
- Signal one line of palette index using one of the following 3 modes
o horizontal mode
In horizontal mode, all the pixels in the same line have the same value. If the value is the same as the first pixel of the above pixel line, only line mode signalling bits are transmitted. Otherwise, the index value is also transmitted.
o vertical mode
■ In vertical mode, the curren pixel line is the same with the above pixel line. Therefore, only line mode signalling bits are transmitted,
o normal mode
In normal mode, pixels in a line are predicted individually. For each pixel, the left or above neighbours is used as predictor, and the prediction symbol is transmitted to the decoder.
In this invention, we invent several methods to improve the major color based coding (palette coding).
SUMMARY OF THE INVENTION
In view of the previously described major color based coding scheme, we propose several methods for major color coding improvement.
Other aspects and features of the invention will become apparent to those with ordinary skill in the art upon review of the following descriptions of specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS
The invention can be more fully understood by reading the subsequent detailed description examples with references made to the accompanying drawings, wherein:
Fig. 1 is a diagram illustrating horizontal scanning order to code the palette index;
Fig. 2 is a diagram illustrating vertical scanning order to code the palette index;
Fig. 3 is a diagram illustrating diagonal scanning order to code the palette index;
Fig. 4 is a diagram illustrating inverse diagonal scanning order to code the palette index; Fig. 5 is a diagram illustrating the invented prediction mode of L shape. DETAILED DESCRIPTION
The following description is of the best-contemplated mode of carrying out the invention. This description is made for the purpose of illustrating the general principles of the invention and should not be taken in a limiting sense. The scope of the invention is best determined by reference to the appended claims.
Additional Coding Modes (Prediction Modes)
In additional to the "run" mode, "copy top" mode, "horizontal" mode and "vertical" mode, we propose additional palette index coding mode (prediction mode) to improve the performance. Note that, when the neighboring palette index value which is used to predict current palette index is not available, a default value (e.g. zero) or a derived value based on the pixel value of the neighboring reconstructed pixels are used,
"copy left" mode
In "copy left" mode, a value "copy_run" (e.g., N) is transmitted or derived to indicate that for the following N positions (including the current one), the palette index is equal to the palette index of the one that is at the same location in the column left. In one example, N could be 1. In another one example of deriving N, the N could be the number of the remaining palette index which are not coded yet within the same line.
"copy left column" mode
In "copy left" mode, all the pixels in the same line have the same value. If the value is the same as the first pixel of the left pixel column, only line mode signalling bits are transmitted, Otherwise, the index value is also transmitted.
"Column filling" mode
In "column filling" mode, all the pixels in the same column (vertical line) have the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only line mode signalling bits are transmitted. Otherwise, the index value is also transmitted,
"copy irregular shape" mode
In "copy irregular shape" mode, a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the palette index of the one that is at the transmitted or derived location,
"fill irregular shape" mode
In "copy irregular shape" mode, a shape description is transmitted or derived to indicate following N positions (including the current one) in the shape are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
"copy L shape" mode
In "copy L shape" mode, following N positions (including the current one) in the L shape, as figure 5, are the palette index of the one that is at the transmitted or derived location.
"fill L shape" mode
In "copy L shape" mode, following N positions (including the current one) in the L shape, as figure 5, are the same value. If the value is the same as the first pixel of the left pixel column, the first pixel of the above pixel row, or any other derived location, only predictionshape description bits (and prediction description bits) are transmitted. Otherwise, the index value is also transmitted.
Adaptive prediction mode signaling
To signal the prediction mode, the signaling method can be adaptively determined. The adaptive signalling method can be use different VLC code to signal mode according to the position of the current pixel. Another adaptive signalling method can be turn off some modes according to the position of the current pixel.
Different Scanning Order for Coding Palette Index
In this invention, we propose to use scanning orders different from horizontal scanning order for coding the palette index.
Vertical scanning order:
As shown in figure 2, the palette index of each pixel is scanned column by column vertically from top pixel to bottom pixel within one column. Besides, the scanning is started from the left most column to the right most column.
In one example of palette coding using vertical scanning order, the "run" mode in Qualcomm's method can still be used and the "copy top" mode is modified as "copy left" mode accordingly. The "normal" mode in Microsoft's method can still be the same and the "horizontal" and "vertical" are modified as " copy left column" and "column filling" modes, respectively.
Other scanning such as Zig-Zag, Hilbert scanning, diagonal scanning (figure 3), inverse diagonal scanning (figure 4) could also be used.
Signaling of Scanning order ( Coding Method)
In this invention, we have proposed several scanning orders for coding the palette index along with different coding methods. If a codec only allows one specific scanning order be used for coding the palette index, any invented scanning order along with the associated coding method could be used. If multiple scanning orders could be used for coding the palette index, additional syntax could be signaled to indicate which one is used for coding the palette index among the different scanning orders (horizontal scanning, vertical scanning, zig-zag scanning, Hilbert scanning and so on) and the associated coding method. The selection of scanning order and the associated coding methods could also be implicitly derived at encoder and decoder sides through an identical derivation process without signaling any additional syntax. Note that, both explicit singaling and implicit deriving of the used scanning order could be done in PU level, CU level, slice level, picture level or sequence level.
REFERENCE
[1] L. Guo, M. Karczewicz, and J. Sole, "RCE3 : Results of Test 3.1 on Palette
Mode for Screen Content Coding", JCTVC-N0247, Vienna, AT, July 2013.
[2] L. Guo, M. Karczewicz, J. Sole, and R. Joshi, "Non-RCE3 : Modified Palette Mode for Screen Content Coding", JCTVC-N0249, Vienna, AT, July 2013.
[3] X. Guo, B. Li, J. Xu, Y. Lu, S. Li, and F. Wu, "AHG8: Major-color-based screen content coding", JCT VC-O0182, Geneva, CH, October 2013.

Claims

1. A method of major color based (palette ) coding method, comprising:
Transmission of the palette;
Scanning the palette indices;
Prediction of palette indices;
Transmission of palette indices.
2. The method as claimed in claim 1, wherein the palette indices within a block are coded using a scanning pattern.
3. The method as claimed in claim 1, wherein the invented prediction modes of palette indices include "copy left", "copy left column", "column filling ", "copy irregular shape", "fill irregular shape" , "fill L shape" , and "fill L shape".
4. The method as claimed in claim 2, wherein the scanning pattern could be vertical, diagonal, zig-zag, Hilbert, or inverse-diagonal scanning patterns.
5. The method as claimed in claim 2, wherein the scanning pattern for each block is explicitly signaled or implicitly derived to indicate which scanning pattern is used among multiple predefined scanning patterns.
6. The method as claimed in claim 5, wherein the signaling or deriving of the scanning pattern for each block could be at TU level, PU level, CU level, LCU level, slice level, picture level, PPS, SPS or VPS.
7. The method as claimed in claim 5, wherein the multiple scanning patterns include "horizontal", "vertical", "Zig-Zag", "Hilbert", "diagonal", "inverse diagonal" scanning patterns.
8. A method of position dependent prediction mode signaling.
PCT/CN2013/090761 2013-12-27 2013-12-27 Patterns of major color index map in palette coding WO2015096157A1 (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
PCT/CN2013/090761 WO2015096157A1 (en) 2013-12-27 2013-12-27 Patterns of major color index map in palette coding
PCT/CN2014/094036 WO2015096647A1 (en) 2013-12-27 2014-12-17 Method and apparatus for major color index map coding
CN201910487086.8A CN110225345B (en) 2013-12-27 2014-12-17 Method and apparatus for primary color index map coding
CN201480070568.9A CN106063270A (en) 2013-12-27 2014-12-17 Method and apparatus for major color index map coding
US15/107,915 US10542271B2 (en) 2013-12-27 2014-12-17 Method and apparatus for major color index map coding
EP14874725.6A EP3087743A4 (en) 2013-12-27 2014-12-17 Method and apparatus for major color index map coding

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2013/090761 WO2015096157A1 (en) 2013-12-27 2013-12-27 Patterns of major color index map in palette coding

Related Child Applications (1)

Application Number Title Priority Date Filing Date
US15/107,915 Continuation-In-Part US10542271B2 (en) 2013-12-27 2014-12-17 Method and apparatus for major color index map coding

Publications (1)

Publication Number Publication Date
WO2015096157A1 true WO2015096157A1 (en) 2015-07-02

Family

ID=53477416

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/090761 WO2015096157A1 (en) 2013-12-27 2013-12-27 Patterns of major color index map in palette coding

Country Status (1)

Country Link
WO (1) WO2015096157A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150186100A1 (en) * 2014-01-02 2015-07-02 Vid Scale, Inc. Two-dimensional palette coding for screen content coding
US9848198B2 (en) 2014-10-06 2017-12-19 Qualcomm Incorporated Diagonal copy for palette mode coding
US11330297B2 (en) 2014-08-19 2022-05-10 Qualcomm Incorporated Methods incorporating extensions to copy-above mode for palette mode coding

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080273804A1 (en) * 2007-05-02 2008-11-06 Motorola, Inc. Image Transformation
CN101884219A (en) * 2007-10-16 2010-11-10 Lg电子株式会社 Handle the method and apparatus of vision signal
US20110197117A1 (en) * 2010-02-09 2011-08-11 Chris Williamson Systems and methods for processing color information in spreadsheets
CN102523367A (en) * 2011-12-29 2012-06-27 北京创想空间商务通信服务有限公司 Real-time image compression and reduction method based on plurality of palettes
CN103209326A (en) * 2013-03-29 2013-07-17 惠州学院 PNG (Portable Network Graphic) image compression method

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080273804A1 (en) * 2007-05-02 2008-11-06 Motorola, Inc. Image Transformation
CN101884219A (en) * 2007-10-16 2010-11-10 Lg电子株式会社 Handle the method and apparatus of vision signal
US20110197117A1 (en) * 2010-02-09 2011-08-11 Chris Williamson Systems and methods for processing color information in spreadsheets
CN102523367A (en) * 2011-12-29 2012-06-27 北京创想空间商务通信服务有限公司 Real-time image compression and reduction method based on plurality of palettes
CN103209326A (en) * 2013-03-29 2013-07-17 惠州学院 PNG (Portable Network Graphic) image compression method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20150186100A1 (en) * 2014-01-02 2015-07-02 Vid Scale, Inc. Two-dimensional palette coding for screen content coding
US10055189B2 (en) * 2014-01-02 2018-08-21 Vid Scale, Inc. Two-dimensional palette coding for screen content coding
US11036459B2 (en) 2014-01-02 2021-06-15 Vid Scale, Inc. Two-dimensional palette coding for screen content coding
US11330297B2 (en) 2014-08-19 2022-05-10 Qualcomm Incorporated Methods incorporating extensions to copy-above mode for palette mode coding
US9848198B2 (en) 2014-10-06 2017-12-19 Qualcomm Incorporated Diagonal copy for palette mode coding

Similar Documents

Publication Publication Date Title
US11659184B2 (en) Method and device for video coding and decoding
US10805644B2 (en) Device and method for entropy encoding and decoding
EP3085083B1 (en) Method and apparatus for palette initialization and management
CN110225345B (en) Method and apparatus for primary color index map coding
US9106910B2 (en) Method of coding and decoding images, corresponding device for coding and decoding and computer program
KR20230145540A (en) Adaptive partition coding
RU2016144371A (en) METHOD FOR DECODING IMAGES, METHOD FOR CODING IMAGES, DEVICE FOR DECODING IMAGES, DEVICE FOR CODING IMAGES AND DEVICE FOR CODING AND DECODING IMAGES
CN105981381A (en) Method and apparatus for scaling parameter coding for inter-component residual prediction
US20210185362A1 (en) Binarization of partitioning related to extended quadtree
US11272182B2 (en) Methods and apparatus of alternative transform skip mode for image and video coding
US10547868B2 (en) Method and device for encoding and decoding information indicating intra skip mode prediction method
US20230262221A1 (en) Method and device for video coding and decoding
CN114287133A (en) Weighting factors for predictive sampling filtering in intra mode
CN112585970A (en) Flexible tile partitioning
CA2942055C (en) Method and apparatus of single sample mode for video coding
WO2015096157A1 (en) Patterns of major color index map in palette coding
CN113347416B (en) Chroma intra prediction method and device, and computer storage medium
EP3896976A1 (en) Image coding and decoding methods, image processing device, and computer storage medium
WO2016115728A1 (en) Improved escape value coding methods
CN110741642B (en) Apparatus and method for directional intra prediction using fitted planes and reference samples
WO2020190413A1 (en) Processing missing points of a point cloud
US20230262211A1 (en) Encoding and decoding method and apparatus, and device therefor
WO2019206115A1 (en) Method and apparatus for restricted linear model parameter derivation in video coding
KR20200079186A (en) Display stream codec for display device and display data encoding method
CN116491118A (en) Video encoding and decoding method and system, video encoder and video decoder

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13900429

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13900429

Country of ref document: EP

Kind code of ref document: A1