WO2013102299A1 - Residue quad tree depth for chroma components - Google Patents

Residue quad tree depth for chroma components Download PDF

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WO2013102299A1
WO2013102299A1 PCT/CN2012/070036 CN2012070036W WO2013102299A1 WO 2013102299 A1 WO2013102299 A1 WO 2013102299A1 CN 2012070036 W CN2012070036 W CN 2012070036W WO 2013102299 A1 WO2013102299 A1 WO 2013102299A1
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rqt depth
depth
maximum
components
chroma components
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PCT/CN2012/070036
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French (fr)
Inventor
Xin Zhao
Xun Guo
Shaw-Min Lei
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Mediatek Singapore Pte. Ltd.
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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
    • H04N19/10—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
    • H04N19/10—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
    • H04N19/46—Embedding additional information in the video signal during the compression process
    • 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
    • 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

Definitions

  • the invention relates generally to video processing.
  • the present invention relates to methods and apparatuses for defining maximum RQT depth separately for luminance (luma) and chrominance (chroma) components in High Efficiency Video Coding (HEVC).
  • HEVC High Efficiency Video Coding
  • HEVC High Efficiency Video Coding
  • JCT-VC Joint Collaborative Team on Video Coding
  • a quad- tree structure is employed to predict, transform and code a picture.
  • CU Coding Unit
  • PU Prediction Unit
  • TU Transform Unit
  • the optimal structures of CU, PU and TU are determined at the encoder and transmitted in the bitstreams to the decoder.
  • the maximum depth of residue quad tree (RQT) which indicates the maximum depth of TU, is defined and transmitted in sequence parameter set (SPS). Luma and chroma share the same RQT depth.
  • the maximum RQT depth information is transmitted in SPS.
  • maximum_transform_hierarchy_depth_intra which indicate the maximum RQT depth for inter coding and intra coding respectively.
  • Luma and chroma components share the same RQT depth.
  • This invention proposes to separate the usage of RQT depth for luma and chroma components. That is, two new syntax elements are transmitted to indicate the maximum RQT depth for chroma components.
  • Fig. 1 is a diagram illustrating the quad tree splitting in HEVC.
  • two syntax elements are proposed to be incorporated in sequence parameter set (SPS), which define the maximum transform splitting depth for intra chroma and inter chroma.
  • SPS sequence parameter set
  • the two syntax elements are named as "max_transform_depth_intra_chroma” and "max_transform_depth_inter_chroma”.
  • An example of the inserted position and signaling of the proposed syntax element in SPS is illustrated in Table 1.
  • the two syntax elements can also be added at other positions, and also in other parameters sets such as picture parameter set (PPS), adaptation parameter set (APS) or slice header.
  • max_transform_depth_intra_chroma_minusl specifies the maximum hierarchy depth for chroma transform blocks of coding blocks coded in intra prediction.
  • the real maximum hierarchy depth for chroma transform blocks is derived by max_transform_depth_intra_chroma_minusl+l.
  • value of this syntax element should be no less than 0 and no larger than RQTDepthLumalntra -1, where RQTDepthLumalntra is the maximum intra RQT depth for luma.
  • max_transform_depth_inter_chroma_minusl specifies the maximum hierarchy depth for chroma transform blocks of coding blocks coded in inter prediction.
  • the real maximum hierarchy depth for chroma transform blocks is derived by max_transform_depth_inter_chroma_minusl+l.
  • value of this syntax element should be no less than 0 and no larger than RQTDepthLumalnter -1, where RQTDepthLumalnter is the maximum inter RQT depth for luma.
  • the two syntax elements can also be coded with other coding methods, such as fix length coding using 2 or 3 bits.
  • Other coding methods such as fix length coding using 2 or 3 bits.
  • An example is shown in Table 2.
  • the original RQT depth syntax elements would change the semantics from indicating the maximum RQT depth for all components to indicating the maximum RQT depth for luma component. For example, “max_transform_hierarchy_depth_inter_luma” and “max_transform_hierarchy_depth_intra_luma”, or
  • the coding method can also be fix length coding or other coding methods, e.g. ue(v), u(2) or u(3).
  • the syntax elements indicating the maximum chroma RQT depth can also be linked to luma.
  • the delta value between luma depth and chroma depth can be transmitted.
  • the maximum chroma RQT depth is equal to the sum of maximum luma RQT depth and the delta value.
  • the coding methods of the delta value can be variable length coding or fix length coding, e.g. ue(v), u(2) or u(3).
  • a chroma TU splitting method is used to decide the transforms used for chroma.
  • maximum 32x32 transform is used for luma
  • maximum 16x16 transform is used for chroma.
  • Table 3 shows an example of chroma RQT depth setting, in which the maximum chroma RQT depth is set as 1.
  • Table 3 Transform depth and TU sizes for chroma when maximum RQT depth is 1
  • Table 4 shows available maximum chroma RQT depth for a specific maximum luma RQT depth.
  • the methods described above select the RQT depth based on the maximum chroma RQT depth and the RQT depth of the luma components for the corresponding image block.
  • An example of selecting the RQT depth for chroma components in an image block in intra coding is to select the "minimum of max_transform_hierarchy_depth_intra and RQT depth of the luma components in the corresponding image block" as the RQT depth of the chroma component in an image block.
  • the splitting of chroma TU shares the same decision with corresponding luma TU at the same level.
  • some implicit splitting methods can also be used. For example, when maximum chroma RQT depth is 2 (one level down from CU), the splitting of TU depends on the PU partitions. If PU partition is 2Nx2N, the splitting of chroma reuses the splitting decision of luma. Otherwise, if the PU partition is rectangular shape, the chroma CU is split.
  • 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

Method of defining maximum RQT depth in video coding is proposed in this invention. In specific, a maximum RQT depth for chrominance (chroma) components is allowed to be different with that of luminance (luma) components. For this purpose, new syntax elements for the maximum RQT depth for chroma components are proposed to be transmitted in some form in SPS, PPS, APS, slice header or any other parameter sets.

Description

RESIDUE QUAD TREE DEPTH FOR CHROMA COMPONENTS
FIELD OF INVENTION
The invention relates generally to video processing. In particular, the present invention relates to methods and apparatuses for defining maximum RQT depth separately for luminance (luma) and chrominance (chroma) components in High Efficiency Video Coding (HEVC).
BACKGROUND OF THE INVENTION
HEVC (High Efficiency Video Coding) is an advanced video coding system being developed under the Joint Collaborative Team on Video Coding (JCT-VC) group of video coding experts from ITU-T Study Group. In HEVC, a quad- tree structure is employed to predict, transform and code a picture. At the encoder, a frame is split into non- overlapped blocks, named Coding Unit (CU). Each CU can be further split into different Prediction Unit (PU) and Transform Unit (TU) as shown in Fig. 1. The optimal structures of CU, PU and TU are determined at the encoder and transmitted in the bitstreams to the decoder. The maximum depth of residue quad tree (RQT), which indicates the maximum depth of TU, is defined and transmitted in sequence parameter set (SPS). Luma and chroma share the same RQT depth.
However, because chroma components are usually much smoother than luma component. Sharing the same RQT depth with luma may be disadvantageous for chroma.
SUMMARY OF THE INVENTION
In light of the previously described problems, there exists a need for an apparatus and method, in which the maximum depth of RQT for luma and chroma is separately defined.
In HEVC, the maximum RQT depth information is transmitted in SPS. There are two syntax elements "max_transform_hierarchy_depth_inter" and
"max_transform_hierarchy_depth_intra", which indicate the maximum RQT depth for inter coding and intra coding respectively. Luma and chroma components share the same RQT depth. This invention proposes to separate the usage of RQT depth for luma and chroma components. That is, two new syntax elements are transmitted to indicate the maximum RQT depth for chroma components.
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 quad tree splitting in HEVC.
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.
In one embodiment of this invention, two syntax elements are proposed to be incorporated in sequence parameter set (SPS), which define the maximum transform splitting depth for intra chroma and inter chroma. For example, the two syntax elements are named as "max_transform_depth_intra_chroma" and "max_transform_depth_inter_chroma". An example of the inserted position and signaling of the proposed syntax element in SPS is illustrated in Table 1. Please note that the two syntax elements can also be added at other positions, and also in other parameters sets such as picture parameter set (PPS), adaptation parameter set (APS) or slice header.
Table 1. Syntax elements related to maximum chroma RQT depth
Figure imgf000003_0001
The possible semantic of the two syntax elements are as follows.
max_transform_depth_intra_chroma_minusl specifies the maximum hierarchy depth for chroma transform blocks of coding blocks coded in intra prediction. The real maximum hierarchy depth for chroma transform blocks is derived by max_transform_depth_intra_chroma_minusl+l. And value of this syntax element should be no less than 0 and no larger than RQTDepthLumalntra -1, where RQTDepthLumalntra is the maximum intra RQT depth for luma.
max_transform_depth_inter_chroma_minusl specifies the maximum hierarchy depth for chroma transform blocks of coding blocks coded in inter prediction. The real maximum hierarchy depth for chroma transform blocks is derived by max_transform_depth_inter_chroma_minusl+l. And value of this syntax element should be no less than 0 and no larger than RQTDepthLumalnter -1, where RQTDepthLumalnter is the maximum inter RQT depth for luma.
Note that the two syntax elements can also be coded with other coding methods, such as fix length coding using 2 or 3 bits. An example is shown in Table 2.
Table 2. Signaling of the two syntax elements
Figure imgf000004_0001
In the above method, the original RQT depth syntax elements would change the semantics from indicating the maximum RQT depth for all components to indicating the maximum RQT depth for luma component. For example, "max_transform_hierarchy_depth_inter_luma" and "max_transform_hierarchy_depth_intra_luma", or
"max_transform_hierarchy_depth_inter_luma_minusl" and "max_transform_hierarchy_depth_intra_luma_minusl". The coding method can also be fix length coding or other coding methods, e.g. ue(v), u(2) or u(3). The syntax elements indicating the maximum chroma RQT depth can also be linked to luma. For example, the delta value between luma depth and chroma depth can be transmitted. In this case, the maximum chroma RQT depth is equal to the sum of maximum luma RQT depth and the delta value. The coding methods of the delta value can be variable length coding or fix length coding, e.g. ue(v), u(2) or u(3).
In another embodiment, a chroma TU splitting method is used to decide the transforms used for chroma. In HEVC, maximum 32x32 transform is used for luma, and maximum 16x16 transform is used for chroma. Table 3 shows an example of chroma RQT depth setting, in which the maximum chroma RQT depth is set as 1. Table 3. Transform depth and TU sizes for chroma when maximum RQT depth is 1
Figure imgf000005_0001
The methods described above allow setting the maximum chroma RQT depth as an integer number smaller than the maximum luma RQT depth. Table 4 shows available maximum chroma RQT depth for a specific maximum luma RQT depth.
Table 4. Available maximum chroma RQT depth values for different maximum luma
RQT depth settings
Figure imgf000005_0002
For encoding and decoding the chroma component in an image block, the methods described above select the RQT depth based on the maximum chroma RQT depth and the RQT depth of the luma components for the corresponding image block. An example of selecting the RQT depth for chroma components in an image block in intra coding is to select the "minimum of max_transform_hierarchy_depth_intra and RQT depth of the luma components in the corresponding image block" as the RQT depth of the chroma component in an image block. Meanwhile, the splitting of chroma TU shares the same decision with corresponding luma TU at the same level.
Considering there are different prediction partitions in HEVC, i.e. 2Nx2N, NxN, Nx2N, 2NxN, 2NxnS and nSx2N, some implicit splitting methods can also be used. For example, when maximum chroma RQT depth is 2 (one level down from CU), the splitting of TU depends on the PU partitions. If PU partition is 2Nx2N, the splitting of chroma reuses the splitting decision of luma. Otherwise, if the PU partition is rectangular shape, the chroma CU is split.
The methods described above can be used in a video encoder as well as in a video decoder. Embodiments of the methods 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

1. A method of defining residue quad tree (RQT) depth in video coding , comprising:
allowing different maximum RQT depths for luma and chroma components; and transmitting the maximum RQT depth for luma components and the maximum RQT depth for chroma components separately in video coding.
2. The method as claimed in claim 1, further comprising incorporating a syntax element to indicate the maximum RQT depth for intra coding of chroma components, wherein the syntax element is incorporated in a sequence parameter set (SPS), picture parameter set (PPS), adaptive parameter set (APS) or slice header.
3. The method as claimed in claim 1, further comprising incorporating a syntax element to indicate the maximum RQT depth for inter coding of chroma components, wherein the syntax element is incorporated in a SPS, PPS, APS or slice header.
4. The method as claimed in claim 1, wherein the maximum RQT depth for U component and V component is transmitted separately.
5. The method as claimed in claim 1, wherein the maximum RQT depth for chroma components has a relationship with the maximum RQT depth for luma components.
6. The method as claimed in claim 5, wherein the maximum RQT depth for chroma components is equal to or less than the maximum RQT depth for luma components.
7. The method as claimed in claim 1, wherein the maximum RQT depth for chroma components is modified to be an integer with minimum value 0 before transmitting the maximum RQT depth for chroma components.
8. The method as claimed in claim 1, wherein the maximum RQT depth for chroma components is transmitted after the maximum RQT depth for luma component.
9. The method as claimed in claim 1, wherein the maximum RQT depth for chroma components is coded using an entropy coding method.
10. The method as claimed in claim 9, wherein the entropy coding method used for coding the maximum RQT depth for chroma components comprises unsigned integer Exp-Golomb- code and fixed length code and variable length code.
11. A method of selecting RQT depth for chroma components of an image block in video coding , comprising:
deriving a maximum RQT depth for chroma components; and
determining an RQT depth for chroma components in a current image block according to the value of the maximum RQT depth for chroma components; wherein the maximum RQT depth for chroma components is explicitly transmitted or implicitly defined.
12. The method as claimed in claim 11, wherein the RQT depth for the chroma components in the current image block is dependent on both the maximum RQT depth for chroma components and an RQT depth for luma components of a corresponding image block.
13. The method as claimed in claim 11, wherein the RQT depth for the chroma components in the current image block is dependent on both the maximum RQT depth for chroma components and a prediction partition of luma components in a corresponding image block.
14. A method of encoding RQT depth for chroma components of an image block in video coding , comprising:
determining an RQT depth for luma components in a corresponding image block; and encoding transform coefficients using an RQT depth different from the RQT depth for luma components.
15. The method as claimed in claim 14, wherein encoding of the transform coefficients begins after encoding of transform coefficients of all luma components in the corresponding image block.
16. The method as claimed in claim 14, wherein encoding of the transform coefficients begins prior to encoding of transform coefficients of all luma components in the corresponding image block.
17. A method of decoding RQT depth for chroma components of an image block in video coding , comprising:
determining an RQT depth of luma components in a corresponding image block; and parsing transform coefficients using an RQT depth different from the RQT depth of the luma components in the corresponding image block.
18. The method as claimed in claim 17, wherein parsing of the transform coefficients begins after parsing of transform coefficients of all luma components in the corresponding image block.
19. The method as claimed in claim 17, wherein parsing of the transform coefficients begins prior to parsing of transform coefficients of all luma components in the corresponding image block.
PCT/CN2012/070036 2012-01-04 2012-01-04 Residue quad tree depth for chroma components WO2013102299A1 (en)

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Cited By (13)

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Publication number Priority date Publication date Assignee Title
US9848197B2 (en) 2011-03-10 2017-12-19 Qualcomm Incorporated Transforms in video coding
CN103747272B (en) * 2014-01-09 2017-03-01 西安电子科技大学 Fast transform approach for the remaining quaternary tree coding of HEVC
CN103747272A (en) * 2014-01-09 2014-04-23 西安电子科技大学 Fast transformation method for residual quadtree coding in HEVC (high efficiency video coding)
US10390050B2 (en) 2014-11-11 2019-08-20 Mediatek Singapore Pte. Ltd. Method of video coding using separate coding tree for luma and chroma
EP3205100A4 (en) * 2014-11-11 2018-05-16 MediaTek Singapore Pte Ltd. Method of video coding using separate coding tree for luma and chroma
RU2674332C2 (en) * 2014-11-11 2018-12-06 Медиатек Сингапур Пте. Лтд Method of video coding with the use of a separate coding tree for brightness and color
CN107079160A (en) * 2014-11-11 2017-08-18 联发科技（新加坡）私人有限公司 The method for video coding of separately encoded tree is used brightness and colourity
CN107079160B (en) * 2014-11-11 2019-12-27 联发科技（新加坡）私人有限公司 Video coding method using separate coding trees for luminance and chrominance
EP4297407A1 (en) * 2014-11-11 2023-12-27 HFI Innovation Inc. Method of video coding using separate coding tree for luma and chroma
CN108605134A (en) * 2016-02-11 2018-09-28 汤姆逊许可公司 For to including method and apparatus that the elementary area of the image data indicated by luminance channel and at least one chrominance channel encodes/decodes
WO2018066809A1 (en) * 2016-10-04 2018-04-12 엘지전자(주) Chroma component coding unit division method and device
US20190238863A1 (en) * 2016-10-04 2019-08-01 Lg Electronics Inc. Chroma component coding unit division method and device
WO2019230670A1 (en) * 2018-05-31 2019-12-05 Sharp Kabushiki Kaisha Systems and methods for partitioning video blocks in an inter prediction slice of video data

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