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Method, device and system for significance mapping of residual coefficients for encoding and decoding transform units

A technique for residual coefficients and encoded data, which is applied in the field of digital video signal processing and can solve problems such as reducing the complexity of lookup tables

Active Publication Date: 2017-11-28
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Each additional lookup table results in an undesired consumption of memory, so reducing the number of lookup tables needed is one aspect of complexity reduction

Method used

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  • Method, device and system for significance mapping of residual coefficients for encoding and decoding transform units
  • Method, device and system for significance mapping of residual coefficients for encoding and decoding transform units
  • Method, device and system for significance mapping of residual coefficients for encoding and decoding transform units

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Embodiment -

[0121] Example-Encoding 8×8TU

[0122] Will refer to Figure 8 , 10A , 10B, 14, 15A, 15B, and 15C illustrate the method 800 according to the present invention for encoding an 8×8 transform unit (TU) 1500 using backward diagonal bottom left scanning. Figure 15A The shown 8×8 transform unit (TU) 1500 has a sub-block size of 4×4. A transform unit (TU) 1500 represents a square lower layer of coefficients to be scanned for encoding. In such as Figure 15C As shown in the sub-block 1502 and other sub-blocks, such as Figure 15C As shown, scan 1505 diagonally to the bottom left after application. In the case of scanning a sub-block in an 8×8 transform unit (TU) 1500, such as Figure 15B As shown, a 2×2 backward diagonal lower left upper layer scan 1504 is applied to its square upper layer 1503 representation. Such as Figure 15B As shown, the upper layer 1503 includes a 2×2 configuration of the lower layer sub-blocks 1502. In this way, the effective coefficient group flag indicates ...

Embodiment

[0138] Example-Diagonal upper layer scan only for 8×8 transformation units

[0139] The methods 800 and 900 applied to transform units (TU) 1500, 1600 and 1700 respectively apply the same scanning pattern from the sub-block layer to the upper layer. An alternative is to use only the backward diagonal bottom left scan for the upper scan for transformation units (TU) 1500, 1600, and 1700. In addition, for all transformation unit sizes, the upper scan can be set to the lower left diagonally backward. Then, the scan mode of the upper layer does not depend on the scan mode of the lower layer. This eliminates the need for memory storage for 2×2 horizontal backward scanning 1604 and 2×2 backward diagonal vertical scanning 1704.

[0140] Example-Reuse 8×8 transformation unit scans for 32×32 upper layer scans

[0141] The 32×32 conversion unit uses an 8×8 upper layer scan as a backward diagonal bottom left scan. The 8×8 upper layer scan can be replaced by the 8×8 back diagonal scan 1505...

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Abstract

A method for decoding residual coefficients of a transform unit from a bitstream of video data is disclosed. The method receives a transform unit from a bitstream of video data (1500), wherein the transform unit has a square upper layer (1503) and a square lower layer (1502). A square upper layer represents a square configuration of up to four significant coefficient group flags each representing a non-overlapping region of a square lower layer. The method determines the significant coefficient group flag of the upper layer of the square for the received transform unit, and determines the value of the residual coefficient of the lower layer of the square according to the determined significant coefficient group flag, so as to transform the bit stream of the video data to decode. A corresponding encoding method is also disclosed.

Description

Technical field [0001] The present invention generally relates to digital video signal processing, and particularly relates to a method, device and system for encoding and decoding residual coefficients of a transform unit (TU), where the shape of the transform unit (TU) may be square or non-square. Background technique [0002] Many applications currently exist including applications for transmitting and storing video data. Many video coding standards have also been developed and other video coding standards are currently under development. The latest progress in video coding standardization has led to the formation of a group called "Joint Expert Group for Video Coding" (JCT-VC). The Joint Expert Group for Video Coding (JCT-VC) includes Study Group 16, Question 6 (SG16 / ITU-T) of the International Telecommunication Union (ITU) known as the Video Coding Expert Group (VCEG). Members of Q6) and members of the International Organization for Standardization / International Electrote...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H04N19/46
CPCH04N19/119H04N19/129H04N19/176H04N19/18H04N19/46H04N19/60H04N19/61H04N19/593H04N19/11H04N19/44
Inventor 克里斯托弗·詹姆斯·罗斯沃恩埃尔文·阿积亚·拉碧欧斯
Owner CANON KK