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Transform method in image coding system and apparatus for same

A decoding device and technology of the device, applied in the field of image coding, can solve the problems of increased transmission cost and storage cost, and achieve the effect of enhancing transformation efficiency and compression efficiency

Inactive Publication Date: 2019-12-06
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 stored using an existing storage medium, its transmission cost and storage cost increase

Method used

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  • Transform method in image coding system and apparatus for same
  • Transform method in image coding system and apparatus for same
  • Transform method in image coding system and apparatus for same

Examples

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Embodiment Construction

[0026] The present embodiment can be modified in various forms, and specific examples thereof will be described and illustrated in the drawings. However, the examples are not intended to limit the present embodiments. Terms used in the following description are for describing specific examples only, and are not intended to limit the present embodiment. A singular expression includes a plural expression as long as it is read clearly in a different manner. Terms such as "comprising" and "having" are intended to indicate the presence of features, numbers, steps, operations, elements, components or combinations thereof used in the following description, and thus it should be understood that one or more different features, numbers, steps are not excluded. , operations, elements, components, or combinations thereof, the existence or possibility of addition.

[0027] In addition, for the convenience of explaining different specific functions, elements in the drawings described in t...

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Abstract

A transform method, according to the present invention, comprises the steps: obtaining transform coefficients for a target block; determining a non-separable secondary transform (NSST) set for the target block; selecting one of a plurality of NSST kernels included in the NSST set on the basis of an NSST index; and generating modified transform coefficients by non-separable secondary-transform of the transform coefficients on the basis of the NSST kernel that has been selected, wherein the NSST set for the target block is determined on the basis of an intra-prediction mode and / or the size of the target block. According to the present invention, the amount of data transmitted, which is required for residual processing, can be reduced and residual coding efficiency can be increased.

Description

technical field [0001] This embodiment relates to image coding technology, and more specifically, to a transformation method and device in an image coding system. Background technique [0002] Demands for high-resolution, high-quality images such as HD (High Definition) images and UHD (Ultra High Definition) images are increasing in various fields. Because image data has high resolution and high quality, the amount of information or bits to be transmitted increases relative to conventional image data. Therefore, when image data is transmitted using a medium such as a conventional wired / wireless broadband line or stored using an existing storage medium, its transmission cost and storage cost increase. [0003] Therefore, there is a need for an efficient image compression technique for efficiently transmitting, storing, and reproducing information of high-resolution and high-quality images. Contents of the invention [0004] technical problem [0005] This embodiment pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/13H04N19/593H04N19/70H04N19/122H04N19/124H04N19/176
CPCH04N19/122H04N19/176H04N19/593H04N19/70H04N19/159H04N19/13H04N19/124H04N19/18
Inventor 金升焕张炯文林宰显
Owner LG ELECTRONICS INC
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