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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 and compression efficiency

Pending Publication Date: 2022-07-15
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
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Embodiment approach

[0258] - Limit the number of output data for forward LFNST to a maximum value of 16 → (i)

[0259] - When 4×4LFNST is applied, all areas to which 4×4LFNST is not applied are cleared → (II)-(A)

[0260] - When 8×8LFNST is applied, all areas to which 8×8LFNST is not applied are cleared → (II)-(B)

[0261] - 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.

[0262] 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. In more detail, in Figure 13 of (a) and Figure 14 In the case of (a) of , the eighth position on the scan order is the last position in which non-zero data can exist. exist Figure 13 of (b) and (c) and Figure 14 In the case of (b) of , the sixteenth position ...

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Abstract

An image decoding method according to the present document may comprise the steps of: determining whether to parse an MTS index for applying an MTS to a current block; and applying the MTS to the current block based on the MTS index to derive a residual sample of the current block; wherein whether to parse the MTS index is determined based on a flag value indicating whether a transform coefficient of a luminance component of the current block exists, and when the flag value is 0, the MTS index is not parsed.

Description

technical field [0001] The present disclosure relates to an image encoding technique, and more particularly, to a method and apparatus for encoding an image based on transformation 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 in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/60H04N19/18H04N19/70H04N19/132H04N19/186H04N19/176H04N19/122H04N19/119H04N19/137
CPCH04N19/60H04N19/176H04N19/186H04N19/18H04N19/137H04N19/119H04N19/70H04N19/132H04N19/122H04N19/46H04N19/96
Inventor 具文模林宰显金昇焕M·萨勒海法尔
Owner LG ELECTRONICS INC