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Transformation-based image coding method and device

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 effect of increasing efficiency and increasing the overall image/video compression efficiency

Pending Publication Date: 2022-06-03
LG ELECTRONICS INC
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  • 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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  • Transformation-based image coding method and device
  • Transformation-based image coding method and device
  • Transformation-based image coding method and device

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Embodiment approach

[0268] - Limit the number of output data for forward LFNST to a maximum value of 16 → (i)

[0269] - When 4×4 LFNST is applied, all areas to which 4×4 LFNST is not applied are cleared → (II)-(A)

[0270] - When 8×8 LFNST is applied, all areas to which 8×8 LFNST is not applied are cleared → (II)-(B)

[0271] - 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.

[0272] 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 14 of (a) and Figure 15 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 14 of (b) and (c) and Figure 15 In the case of (b) of , the sixteenth posit...

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Abstract

An image decoding method according to the present document comprises a step of deriving a residual sample, in which the step of deriving the residual sample comprises the steps of: deriving a transform kernel for an inverse primary transform applied to a sub-partition block on the basis of a horizontal length or a vertical length of the sub-partition block when a current block is divided into the sub-partition block; and deriving residual samples from the transform coefficients based on the transform kernel.

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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IPC IPC(8): H04N19/119H04N19/137H04N19/122H04N19/70H04N19/132H04N19/60H04N19/18H04N19/176
CPCH04N19/119H04N19/137H04N19/122H04N19/70H04N19/132H04N19/60H04N19/18H04N19/176
Inventor 具文模林宰显金昇焕
Owner LG ELECTRONICS INC
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