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Transform-based image coding method and device therefor

An image coding and image decoding technology, applied in the field of image coding, can solve the problems of increased transmission cost and storage cost, and achieve the effects of improving residual coding efficiency, compression efficiency and coding efficiency.

Active Publication Date: 2021-11-02
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, if image data is transmitted using a medium such as an existing wired or wireless broadband line or image and video data is stored using an existing storage medium, transmission costs and storage costs increase

Method used

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  • Transform-based image coding method and device therefor
  • Transform-based image coding method and device therefor
  • Transform-based image coding method and device therefor

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Experimental program
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Embodiment approach 1

[0159] 1) Return to zero implementation mode 1 + return to zero implementation mode 2

Embodiment approach 1

[0160] 2) Return to zero implementation mode 1 + return to zero implementation mode 3

[0161] As mentioned in the zeroing embodiment 2 and the zeroing embodiment 3, zeroing may be applied only to the residual signal to which intra prediction is applied or may be applied only to the residual signal to which inter prediction is applied. Alternatively, the zeroing method may be applied to both the residual signal to which intra prediction is applied and the residual signal to which inter prediction is applied. Correspondingly, when the MTS flag is 1, the following table can be configured (when the MTS flag is 0, implementation mode 1 of zeroing can be applied).

[0162] [table 5]

[0163] configuration index intra prediction residual signal Inter prediction residual signal 1 Zeroing should not be applied Zeroing should not be applied 2 Zeroing should not be applied Zero implementation mode 2 3 Zeroing should not be applied Zeroing implement...

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Abstract

An image decoding method according to the present document comprises a step for deriving a residual sample, wherein the step for deriving the residual sample comprises the steps of: deriving a zero out block for a current block; deriving a context model for last significant coefficient location information on the basis of the width or height of the current block; deriving a value of a last significant coefficient location on the basis of the context model; and deriving the last significant coefficient location on the basis of a value of the last significant coefficient location information and the width or height of the zero out block.

Description

technical field [0001] The present disclosure generally relates to image coding technology, and more particularly, relates to a transform-based image coding method and device thereof in an image coding system. Background technique [0002] Demands for high-resolution and high-quality images and videos such as ultra-high-definition (HUD) images and 4K or 8K or larger videos are increasing recently in various fields. As image and video data become high-resolution and high-quality, the relative amount of transmitted information or number of bits increases compared with existing image and video data. Therefore, if image data is transmitted using a medium such as an existing wired or wireless broadband line or image and video data is stored using an existing storage medium, transmission costs and storage costs increase. [0003] Furthermore, there has recently been increasing interest and demand for immersive media such as virtual reality (VR), artificial reality (AR) content, o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/60H04N19/132H04N19/176H04N19/14H04N19/137
CPCH04N19/132H04N19/176H04N19/70H04N19/12H04N19/18H04N19/625H04N19/13H04N19/60H04N19/14H04N19/137H04N19/167H04N19/196
Inventor 具文模林宰显崔情娥金昇焕梅迪·萨利希法
Owner LG ELECTRONICS INC