WO2013106988A1 - Methods and apparatuses of residue transform depth representation - Google Patents

Methods and apparatuses of residue transform depth representation Download PDF

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Publication number
WO2013106988A1
WO2013106988A1 PCT/CN2012/070430 CN2012070430W WO2013106988A1 WO 2013106988 A1 WO2013106988 A1 WO 2013106988A1 CN 2012070430 W CN2012070430 W CN 2012070430W WO 2013106988 A1 WO2013106988 A1 WO 2013106988A1
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WO
WIPO (PCT)
Prior art keywords
transform
depth
hierarchy
flag
max
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Ceased
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PCT/CN2012/070430
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French (fr)
Inventor
Jicheng An
Xin Zhao
Xun Guo
Shaw-Min Lei
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MediaTek Singapore Pte Ltd
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MediaTek Singapore Pte Ltd
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Priority to PCT/CN2012/070430 priority Critical patent/WO2013106988A1/en
Publication of WO2013106988A1 publication Critical patent/WO2013106988A1/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
    • H04N19/10—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
    • H04N19/70—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

Definitions

  • the invention relates generally to video processing.
  • the present invention relates to methods and apparatuses for residue transform depth representation for Y, U, and V components in High Efficiency Video Coding (HEVC).
  • HEVC High Efficiency Video Coding
  • HEVC 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.
  • JCT-VC Joint Collaborative Team on Video Coding
  • the residue transform depth is shared between luma (Y) and chroma (U and V) components.
  • a syntax element split_transform_flag is used to indicate the transform depth increase for all Y, U, and V components as shown in Fig. 1.
  • the TU split flag and cbf flag coding is shown in Fig. 3.
  • a syntax element max_transform_hierarchy_depth_inter is used to indicate the maximum transform depth in a sequence for all Y, U, and V components for inter case
  • a syntax element max_transform_hierarchy_depth_intra is used to indicate the maximum transform depth in a sequence for all Y, U, and V components for intra case.
  • three separate syntax elements split_transform_Y_flag, split_transform_U_flag, and split_transform_V_flag instead of one shared split_transform_flag, are used to indicate the transform depth increase for Y, U, and V components respectively as shown in Fig. 2.
  • the TU split flag and cbf flag coding for Y component is shown in Fig. 4.
  • the TU split flag and cbf flag coding for U or V component is shown in Fig. 5.
  • Fig. 1 is a diagram illustrating the TU split in current HEVC.
  • Fig. 2 is a diagram illustrating the TU split in the proposed method.
  • Fig. 3 is a flowchart illustrating the coding of TU split flag and cbf flag in current HEVC.
  • Fig. 4 is a flowchart illustrating the coding of TU split flag and cbf flag for Y component in the proposed method.
  • Fig. 5 is a flowchart illustrating the coding of TU split flag and cbf flag for Y or V component in the proposed method.
  • Y, U, and V components are not forced to have the same residual transform depth.
  • three separate syntax elements split_transform_Y_flag, split_transform_U_flag, and split_transform_V_flag instead of one shared split_transform_flag, are used to indicate the transform depth increase for Y, U, and V components respectively.
  • two separate syntax elements split_transform_luma_flag and split_transform_chroma_flag instead of one shared split_transform_flag are used to indicate the transform depth increase for luma and chroma components respectively.
  • 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)

Description

METHODS AND APPARATUSES OF RESIDUE TRANSFORM DEPTH
REPRESENTATION
FIELD OF INVENTION
The invention relates generally to video processing. In particular, the present invention relates to methods and apparatuses for residue transform depth representation for Y, U, and V components in High Efficiency Video Coding (HEVC).
BACKGROUND OF THE INVENTION
HEVC 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 current HEVC (test model version 5.0), the residue transform depth is shared between luma (Y) and chroma (U and V) components. In transform tree syntax, a syntax element split_transform_flag is used to indicate the transform depth increase for all Y, U, and V components as shown in Fig. 1. The TU split flag and cbf flag coding is shown in Fig. 3. In Sequence Parameter Set RBSP (SPS) syntax, a syntax element max_transform_hierarchy_depth_inter is used to indicate the maximum transform depth in a sequence for all Y, U, and V components for inter case, and a syntax element max_transform_hierarchy_depth_intra is used to indicate the maximum transform depth in a sequence for all Y, U, and V components for intra case.
However, there is no evidence to show that the Y, U, and V components have dependencies in residue transform depth. Therefore, applying the same transform depth on Y, U, and V components may hurt coding performance. SUMMARY OF THE INVENTION
In light of the previously described problems, there exists a need for an apparatus and method, in which the Y, U, and V components are not forced to have the same residual transform depth.
In one embodiment, in transform tree syntax, three separate syntax elements split_transform_Y_flag, split_transform_U_flag, and split_transform_V_flag instead of one shared split_transform_flag, are used to indicate the transform depth increase for Y, U, and V components respectively as shown in Fig. 2. The TU split flag and cbf flag coding for Y component is shown in Fig. 4. The TU split flag and cbf flag coding for U or V component is shown in Fig. 5.
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 TU split in current HEVC.
Fig. 2 is a diagram illustrating the TU split in the proposed method.
Fig. 3 is a flowchart illustrating the coding of TU split flag and cbf flag in current HEVC.
Fig. 4 is a flowchart illustrating the coding of TU split flag and cbf flag for Y component in the proposed method.
Fig. 5 is a flowchart illustrating the coding of TU split flag and cbf flag for Y or V component in the proposed method.
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.
The Y, U, and V components are not forced to have the same residual transform depth. In the first embodiment, in transform tree syntax, three separate syntax elements split_transform_Y_flag, split_transform_U_flag, and split_transform_V_flag instead of one shared split_transform_flag, are used to indicate the transform depth increase for Y, U, and V components respectively.
In the second embodiment, in transform tree syntax, two separate syntax elements split_transform_luma_flag and split_transform_chroma_flag instead of one shared split_transform_flag are used to indicate the transform depth increase for luma and chroma components respectively.
In the third embodiment, in SPS (Sequence Parameter Set RBSP) syntax, 3 separate syntax elements max_transform_hierarchy_depth_Y_inter, max_transform_hierarchy_depth_U_inter, and max_transform_hierarchy_depth_V_inter instead of one shared syntax element max_transform_hierarchy_depth_inter, are used to indicate the maximum transform depth in a sequence for Y, U, and V components respectively for inter case. 3 separate syntax elements max_transform_hierarchy_depth_Y_intra, max_transform_hierarchy_depth_U_intra, and max_transform_hierarchy_depth_V_intra, instead of one shared syntax element max_transform_hierarchy_depth_intra, are used to indicate the maximum transform depth in a sequence for Y, U, and V components respectively for intra case.
In the fourth embodiment, in SPS (Sequence Parameter Set RBSP) syntax, 2 separate syntax elements max_transform_hierarchy_depth_luma_inter and max_transform_hierarchy_depth_chroma_inter instead of one shared syntax element max_transform_hierarchy_depth_inter, are used to indicate the maximum transform depth in a sequence for luma and chroma components respectively for inter case. 2 separate syntax elements max_transform_hierarchy_depth_luma_intra and max_transform_hierarchy_depth_chroma_intra instead of one shared syntax element max_transform_hierarchy_depth_intra, are used to indicate the maximum transform depth in a sequence for luma and chroma components respectively for intra case.
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 residue transform depth representation for Y, U, and V components.
2. The method as claimed in claim 1, wherein the Y, U and V components are allowed to use different transform depths.
3. The method as claimed in claim 1, wherein the transform depth for each transform unit can be derived by the syntax elements split_transform_Y_flag, split_transform_U_flag, and split_transform_V_flag respectively for Y, U, and V components.
4. The method as claimed in claim 3, wherein U and V components share the same splitting flag.
5. The method as claimed in claim 1, wherein the maximum transform depth for inter case of a sequence can be derived by the syntax elements max_transform_hierarchy_depth_Y_inter, max_transform_hierarchy_depth_U_inter, and max_transform_hierarchy_depth_V_inter respectively for Y, U, and V components.
6. The method as claimed in claim 1, wherein the maximum transform depth for intra case of a sequence can be derived by the syntax elements max_transform_hierarchy_depth_Y_intra, max_transform_hierarchy_depth_U_intra, and max_transform_hierarchy_depth_V_intra respectively for Y, U, and V components.
PCT/CN2012/070430 2012-01-16 2012-01-16 Methods and apparatuses of residue transform depth representation Ceased WO2013106988A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015137736A1 (en) * 2014-03-11 2015-09-17 삼성전자 주식회사 Depth image prediction mode transmission method and apparatus for encoding and decoding inter-layer video
WO2016037363A1 (en) * 2014-09-12 2016-03-17 Mediatek Singapore Pte. Ltd. Methods of residue transform tree representation

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101404773A (en) * 2008-11-25 2009-04-08 江苏大学 Image encoding method based on DSP
CN101577828A (en) * 2008-04-16 2009-11-11 英特尔公司 Tone mapping for bit depth scalable video codec
CN102067609A (en) * 2008-06-12 2011-05-18 汤姆森特许公司 Methods and apparatus for video coding and decoding with reduced bit-depth update mode and reduced chroma sampling update mode

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101577828A (en) * 2008-04-16 2009-11-11 英特尔公司 Tone mapping for bit depth scalable video codec
CN102067609A (en) * 2008-06-12 2011-05-18 汤姆森特许公司 Methods and apparatus for video coding and decoding with reduced bit-depth update mode and reduced chroma sampling update mode
CN101404773A (en) * 2008-11-25 2009-04-08 江苏大学 Image encoding method based on DSP

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2015137736A1 (en) * 2014-03-11 2015-09-17 삼성전자 주식회사 Depth image prediction mode transmission method and apparatus for encoding and decoding inter-layer video
WO2016037363A1 (en) * 2014-09-12 2016-03-17 Mediatek Singapore Pte. Ltd. Methods of residue transform tree representation

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