WO2016123801A1 - Methods for partition mode coding - Google Patents

Methods for partition mode coding Download PDF

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Publication number
WO2016123801A1
WO2016123801A1 PCT/CN2015/072428 CN2015072428W WO2016123801A1 WO 2016123801 A1 WO2016123801 A1 WO 2016123801A1 CN 2015072428 W CN2015072428 W CN 2015072428W WO 2016123801 A1 WO2016123801 A1 WO 2016123801A1
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Prior art keywords
mode
partpredidc
values
current prediction
illegal
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PCT/CN2015/072428
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French (fr)
Inventor
Xianguo Zhang
Kai Zhang
Jian-Liang Lin
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Mediatek Singapore Pte. Ltd.
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Priority to PCT/CN2015/072428 priority Critical patent/WO2016123801A1/en
Priority to PCT/CN2015/081753 priority patent/WO2015192781A1/en
Priority to JP2016571299A priority patent/JP2017520994A/en
Priority to US14/905,705 priority patent/US10218957B2/en
Priority to CN201580001621.4A priority patent/CN105519120B/en
Publication of WO2016123801A1 publication Critical patent/WO2016123801A1/en

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    • 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
    • H04N19/90—Methods 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
    • H04N19/96—Tree coding, e.g. quad-tree coding
    • 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
    • H04N19/119—Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
    • 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
    • H04N19/50—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding
    • H04N19/597—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals using predictive coding specially adapted for multi-view video sequence encoding
    • 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
    • H04N19/70—Methods or arrangements for coding, decoding, compressing or decompressing digital video signals characterised by syntax aspects related to video coding, e.g. related to compression standards
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N13/00—Stereoscopic video systems; Multi-view video systems; Details thereof
    • H04N13/10—Processing, recording or transmission of stereoscopic or multi-view image signals
    • H04N13/106—Processing image signals
    • H04N13/161—Encoding, multiplexing or demultiplexing different image signal components

Definitions

  • the invention relates generally to Multi-view video coding and Three-Dimensional (3D) video coding.
  • the present invention relates to optimized methods for coding the partition mode flag in 3D video coding.
  • 3D video coding is developed for encoding or decoding video data of multiple views simultaneously captured by several cameras. Since all cameras capture the same scene for both the input texture videos and depth videos, there is a large amount of redundancy between texture and depth videos in the same view. To reduce the redundancy, a texture-dependent depth partition (TDDP) is utilized when the collocated coding unit (CU) of the current depth CU is at the same quad-tree level in the current 3D-HEVC.
  • TDDP texture-dependent depth partition
  • the vertical/horizontal partitions are allowed for a depth CU only when the collocated texture CU at the same quad-tree level is coded with vertical/horizontal or NxN partitions as illustrated in Fig. 1.
  • the vertical partitions include Nx2N, nLx2N and nRx2N; while the horizontal partitions include Nx2N, nLx2N and nRx2N.
  • Table 1 and 2 show the two kinds of possible correspondences between part_mode values and prediction partition for inter prediction. Table 1 presents the case when the same part_mode values at different partPredIdc values indicate the same partition mode.
  • Table 2 shows the case when the same part_mode values at different partPredIdc values indicates different partition mode.
  • part_mode PartMode 0 PART_2Nx2N 1 PART_NxN 0 PART_2Nx2N 1 PART_2NxN 2 PART_Nx2N 3 PART_NxN 4 PART_2NxnU
  • part_mode partPredIdc PartMode 0 0 PART_2Nx2N 1 0 PART_NxN 0 0,1,2 PART_2Nx2N 1 0 PART_2NxN 1 1 PART_2NxN 1 2 PART_Nx2N 2 0 PART_Nx2N 2 1 PART_2NxnU 2 2 PART_nLx2N 3 0 PART_NxN 3 1 PART_2NxnD 3 2 PART_nRx2N 4 0 PART_2NxnU 5 0 PART_2NxnD 6 0 PART_nLx2N 7 0 PART_nRx2N
  • partPredIdc when the collocated texture CU at the same quad-tree level is coded with horizontal or vertical, the variable partPredIdc is set equal to 1 or 2 respectively.
  • partPredIdc is set equal 0. In this way, the part_mode flag which indicates the partition mode can be either encoded with shorter bin string or the same as HEVC does.
  • part_mode in video stream.
  • the limitation is only related to whether the current mode is intra or inters mode and whether AMP mode is enabled.
  • partPredIdc has no dependency on partPredIdc values.
  • partPredIdc is not equal to 0
  • part_mode value is legal and can be transmitted in video stream. If one illegal part_mode value is transmitted, the decoder must have one solution to deal with this case.
  • part_mode values when TDDP is utilized for 3D-HEVC coding.
  • partPredIdc when the partPredIdc is not equal to 0, only the corresponding part_mode values of horizontal or vertical partitions are legal and allowed.
  • part_mode decoding when illegal part_mode values are transmitted, methods are proposed for part_mode decoding.
  • the illegal values can be decoded to be 2Nx2N mode.
  • Fig. 1 is a diagram illustrating the current candidate depth prediction partitions at different prediction partitions of the collocated texture blocks.
  • Afirst embodiment of method 2 if the transmitted or decoded part_mode is illegal, a specified partition mode among the legal mode is set for the current prediction unit.
  • Asecond embodiment of method 2 if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes 2Nx2N inter mode.
  • the current prediction unit utilizes 2Nx2N intra mode.
  • the current prediction unit utilizes Nx2N inter mode the decoded partition mode is nLx2N or nRx2N.
  • the current prediction unit utilizes 2NxN inter mode when the decoded partition mode is 2NxnU or 2NxnD.
  • Another embodiment of method 2 if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes the decoded illegal inter mode.
  • an embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein.
  • An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein.
  • DSP Digital Signal Processor
  • the invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) .
  • processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention.
  • the software code or firmware codes may be developed in different programming languages and different format or style.
  • the software code may also be compiled for different target platform.
  • different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.

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

Abstract

Methods of partition mode coding of depth coding for multi-view video coding and 3D video coding are disclosed. Several methods are proposed to limit the transmission of part_mode values when TDDP is utilized for 3D-HEVC coding. Also when illegal part_mode values are transmitted, methods are proposed for part_mode decoding.

Description

METHODS FOR PARTITION MODE CODING TECHNICAL FIELD
The invention relates generally to Multi-view video coding and Three-Dimensional (3D) video coding. In particular, the present invention relates to optimized methods for coding the partition mode flag in 3D video coding.
BACKGROUND
3D video coding is developed for encoding or decoding video data of multiple views simultaneously captured by several cameras. Since all cameras capture the same scene for both the input texture videos and depth videos, there is a large amount of redundancy between texture and depth videos in the same view. To reduce the redundancy, a texture-dependent depth partition (TDDP) is utilized when the collocated coding unit (CU) of the current depth CU is at the same quad-tree level in the current 3D-HEVC.
As shown in Fig. 1, the vertical/horizontal partitions are allowed for a depth CU only when the collocated texture CU at the same quad-tree level is coded with vertical/horizontal or NxN partitions as illustrated in Fig. 1. Here the vertical partitions include Nx2N, nLx2N and nRx2N； while the horizontal partitions include Nx2N, nLx2N and nRx2N. Table 1 and 2 show the two kinds of possible correspondences between part_mode values and prediction partition for inter prediction. Table 1 presents the case when the same part_mode values at different partPredIdc values indicate the same partition mode. Table 2 shows the case when the same part_mode values at different partPredIdc values indicates different partition mode.
Table 1.
part_mode PartMode
0 PART_2Nx2N
1 PART_NxN
0 PART_2Nx2N
1 PART_2NxN
2 PART_Nx2N
3 PART_NxN
4 PART_2NxnU
5 PART_2NxnD
6 PART_nLx2N
7 PART_nRx2N
Table 2.
part_mode partPredIdc PartMode
0 0 PART_2Nx2N
1 0 PART_NxN
0 0,1,2 PART_2Nx2N
1 0 PART_2NxN
1 1 PART_2NxN
1 2 PART_Nx2N
2 0 PART_Nx2N
2 1 PART_2NxnU
2 2 PART_nLx2N
3 0 PART_NxN
3 1 PART_2NxnD
3 2 PART_nRx2N
4 0 PART_2NxnU
5 0 PART_2NxnD
6 0 PART_nLx2N
7 0 PART_nRx2N
In semantics, when the collocated texture CU at the same quad-tree level is coded with horizontal or vertical, the variable partPredIdc is set equal to 1 or 2 respectively. When the collocated texture block has a larger depth or non-horizontal-and-vertical partitions, partPredIdc is set equal 0. In this way, the part_mode flag which indicates the partition mode can be either encoded with shorter bin string or the same as HEVC does.
However, there is still one problem about the transmission of part_mode in video stream. In the current WD6, the limitation is only related to whether the current mode is intra or inters mode and whether AMP mode is enabled.
As we can see, such limitation has no dependency on partPredIdc values. However, while TDDP is utilized and partPredIdc is not equal to 0, not every part_mode value is legal and can be transmitted in video stream. If one illegal part_mode value is transmitted, the decoder must have  one solution to deal with this case.
SUMMARY
It is firstly proposed to limit the transmission of part_mode values when TDDP is utilized for 3D-HEVC coding. In detail, when the partPredIdc is not equal to 0, only the corresponding part_mode values of horizontal or vertical partitions are legal and allowed.
Secondly, when illegal part_mode values are transmitted, methods are proposed for part_mode decoding. For example, the illegal values can be decoded to be 2Nx2N mode.
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 and examples with references made to the accompanying drawings, wherein:
Fig. 1 is a diagram illustrating the current candidate depth prediction partitions at different prediction partitions of the collocated texture blocks.
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.
There are two kinds of methods proposed for the partition mode flag coding. (1) Add limitation on the value range of part_mode flag when partPredIdc is not equal to 0； (2) Design decoding method for illegal part_mode values.
Afirst embodiment of method 1, when partPredIdc is equal to 1 (identifying the horizontal partitions) , only the part_mode values corresponding to horizontal and 2Nx2N partitions are allowed.
Asecond embodiment of method 1, when partPredIdc is equal to 2 (identifying the vertical partitions) , only the part_mode values corresponding to vertical partitions and 2Nx2N are allowed. 
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the same partition mode and AMP mode is allowed, only the part_mode values of 0, 1, 4 and 5 are allowed when partPredIdc is equal to 1.
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the same partition modes and AMP mode is disallowed, only the part_mode values of 0 and 2 are allowed when partPredIdc is equal to 2.
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the same partition mode and AMP mode is disallowed, only the part_mode values of 0 and 1 are allowed when partPredIdc is equal to 1.
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the same partition modes and AMP mode is disallowed, only the part_mode values of 0 and 2 are allowed when partPredIdc is equal to 2.
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the different partition modes and AMP mode is allowed, only the part_mode values of 0, 1, 2 and 3 are allowed when partPredIdc is not equal to 0.
Another embodiment of method 1, if the same part_mode values at different partPredIdc values indicate the different partition modes and AMP mode is disallowed, only the part_mode values of 0 and 1 are allowed when partPredIdc is not equal to 0.
Afirst embodiment of method 2, if the transmitted or decoded part_mode is illegal, a specified partition mode among the legal mode is set for the current prediction unit.
Asecond embodiment of method 2, if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes 2Nx2N inter mode.
Another embodiment of method 2, if the transmitted or decoded part_mode is illegal and the current prediction mode is intra, the current prediction unit utilizes 2Nx2N intra mode.
Another embodiment of method 2, if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes 2NxN inter mode when partPredIdc ＝ 1.
Another embodiment of method 2, if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes Nx2N inter mode when partPredIdc ＝ 2.
Another embodiment of method 2, if the transmitted or decoded part_mode is one illegal AMP mode, the current prediction unit utilizes Nx2N inter mode the decoded partition mode is nLx2N or nRx2N.
Another embodiment of method 2, if the transmitted or decoded part_mode is one illegal AMP mode, the current prediction unit utilizes 2NxN inter mode when the decoded partition mode is 2NxnU or 2NxnD.
Another embodiment of method 2, if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes the decoded illegal inter mode.
The proposed method described above can be used in a video encoder as well as in a video decoder. Embodiments of the method according to the present invention as described above may be implemented in various hardware, software codes, or a combination of both. For example, an  embodiment of the present invention can be a circuit integrated into a video compression chip or program codes integrated into video compression software to perform the processing described herein. An embodiment of the present invention may also be program codes to be executed on a Digital Signal Processor (DSP) to perform the processing described herein. The invention may also involve a number of functions to be performed by a computer processor, a digital signal processor, a microprocessor, or field programmable gate array (FPGA) . These processors can be configured to perform particular tasks according to the invention, by executing machine-readable software code or firmware code that defines the particular methods embodied by the invention. The software code or firmware codes may be developed in different programming languages and different format or style. The software code may also be compiled for different target platform. However, different code formats, styles and languages of software codes and other means of configuring code to perform the tasks in accordance with the invention will not depart from the spirit and scope of the invention.
The invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The described examples are to be considered in all respects only as illustrative and not restrictive. To the contrary, it is intended to cover various modifications and similar arrangements (as would be apparent to those skilled in the art) . Therefore, the scope of the appended claims should be accorded the broadest interpretation so as to encompass all such modifications and similar arrangements.

Claims (17)

  1. A method of partition mode coding for multi-view video coding, 3D video coding or screen content video coding, comprising coding or decoding the partition mode flag satisfying at least one of the follows:
    -There are limitations on the value range of part_mode flag when partPredIdc is not equal to 0；
    -A decoding process for illegal part_mode values is designed.
  2. The method as claimed in claim 1, wherein when partPredIdc is equal to 1 (identifying the horizontal partitions) , only the part_mode values corresponding to horizontal and 2Nx2N partitions are allowed.
  3. The method as claimed in claim 1, wherein when partPredIdc is equal to 2 (identifying the vertical partitions) , only the part_mode values corresponding to vertical and 2Nx2N partitions are allowed.
  4. The method as claimed in claim 2, wherein if the same part_mode values at different partPredIdc values indicate the same partition mode and AMP mode is allowed, only the part_mode values of 0, 1, 4 and 5 are allowed when partPredIdc is equal to 1.
  5. The method as claimed in claim 3, wherein if the same part_mode values at different partPredIdc values indicate the same partition modes and AMP mode is disallowed, only the part_mode values of 0 and 2 are allowed when partPredIdc is equal to 2.
  6. The method as claimed in claim 2, wherein if the same part_mode values at different partPredIdc values indicate the same partition mode and AMP mode is disallowed, only the part_mode values of 0 and 1 are allowed when partPredIdc is equal to 1.
  7. The method as claimed in claim 3, wherein if the same part_mode values at different partPredIdc values indicate the same partition modes and AMP mode is disallowed, only the part_mode values of 0 and 2 are allowed when partPredIdc is equal to 2.
  8. The method as claimed in claim 1, wherein if the same part_mode values at different partPredIdc values indicate the different partition modes and AMP mode is allowed, only the part_mode values of 0, 1, 2 and 3 are allowed when partPredIdc is not equal to 0.
  9. The method as claimed in claim 1, wherein if the same part_mode values at different partPredIdc values indicate the different partition modes and AMP mode is disallowed, only the  part_mode values of 0 and 1 are allowed when partPredIdc is not equal to 0.
  10. The method as claimed in claim 1, wherein if the transmitted or decoded part_mode is illegal, a specified partition mode among the legal mode is set for the current prediction unit.
  11. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes 2Nx2N inter mode.
  12. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is illegal and the current prediction mode is intra, the current prediction unit utilizes 2Nx2N intra mode.
  13. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes 2NxN inter mode when partPredIdc ＝ 1.
  14. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is illegal and the current prediction mode is inter, the current prediction unit utilizes Nx2N inter mode when partPredIdc ＝ 2.
  15. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is one illegal AMP mode, the current prediction unit utilizes Nx2N inter mode when the decoded partition mode is nLx2N or nRx2N.
  16. The method as claimed in claim 10, wherein if the transmitted or decoded part_mode is one illegal AMP mode, the current prediction unit utilizes 2NxN inter mode when the decoded partition mode is 2NxnU or 2NxnD.
  17. The method as claimed in claim 1, wherein if the transmitted or decoded part_mode is illegal, the current prediction unit directly utilizes the transmitted illegal mode for decoding.
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JP2016571299A JP2017520994A (en) 2014-06-20 2015-06-18 Sub-PU syntax signaling and illumination compensation method for 3D and multi-view video coding
US14/905,705 US10218957B2 (en) 2014-06-20 2015-06-18 Method of sub-PU syntax signaling and illumination compensation for 3D and multi-view video coding
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