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Transform-based image encoding method and apparatus therefor

An image encoding and image decoding technology, applied in the field of image encoding, can solve the problems of increased transmission cost and storage cost, and achieve the effect of increasing efficiency

Active Publication Date: 2022-08-02
LG ELECTRONICS INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, when image data is transmitted using a medium such as a conventional wired / wireless broadband line or image / video data is stored using an existing storage medium, its transmission cost and storage cost increase

Method used

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  • Transform-based image encoding method and apparatus therefor
  • Transform-based image encoding method and apparatus therefor
  • Transform-based image encoding method and apparatus therefor

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Experimental program
Comparison scheme
Effect test

Embodiment approach

[0255] - Limit the number of output data for forward LFNST to a maximum of 16 → (i)

[0256] - When 4x4LFNST is applied, all areas to which 4x4LFNST is not applied are cleared → (ii)-(A)

[0257] - When 8x8LFNST is applied, all areas to which 8x8LFNST is not applied are cleared → (ii)-(B)

[0258] - after checking if non-zero data is also present in existing regions filled with zero values ​​and in regions filled with zeros due to additional clearing ((ii)-(A), (ii)-(B)), The LFNST index → ​​(iii) is only signaled when there is no non-zero data.

[0259] In the case of an embodiment, when LFNST is applied, the area where non-zero output data may exist is limited to the interior of the upper left 4x4 area. More specifically, in Figure 13 of (a) and Figure 14 In (a) of , the eighth position in the scan order is the last position in which non-zero data can exist. exist Figure 13 of (b) and (d) and Figure 14 In (b) of , the sixteenth position in the scan order (ie, the ...

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Abstract

An image decoding method according to the present document may comprise the steps of: deriving an intra prediction mode of a chroma block as a cross component linear model (CCLM) mode based on intra prediction mode information; updating the intra prediction mode of the chroma block based on the intra prediction mode of the luma block corresponding to the chroma block; when the chroma block is not a square, remapping the updated intra prediction mode to a wide-angle intra prediction mode; and determining an LFNST set including an LFNST matrix based on the remapped intra prediction mode.

Description

technical field [0001] The present disclosure generally relates to an image encoding technique, and more particularly, to a transform-based image encoding method and apparatus thereof in an image encoding system. Background technique [0002] Today, the demand for high-resolution and high-quality images / videos such as Ultra High Definition (UHD) images / videos in 4K, 8K or higher has been increasing in various fields. As image / video data becomes higher resolution and higher quality, the amount of information or bits transmitted increases compared to conventional image data. Therefore, when a medium such as a conventional wired / wireless broadband line is used to transmit image data or an existing storage medium is used to store image / video data, its transmission cost and storage cost increase. [0003] In addition, nowadays, the interest and demand for immersive media such as virtual reality (VR) and artificial reality (AR) content or holograms are increasing, and there is an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/61H04N19/11H04N19/593H04N19/176H04N19/186H04N19/18H04N19/132H04N19/122
CPCH04N19/61H04N19/11H04N19/593H04N19/176H04N19/186H04N19/18H04N19/132H04N19/122H04N19/105H04N19/159
Inventor 具文模张炯文金昇焕林宰显
Owner LG ELECTRONICS INC