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An image coding apparatus and method thereof based on a quantization parameter derivation

A technology of quantization parameters and decoding equipment, which is applied in the field of image coding, can solve the problems of increased transmission costs and storage costs, and achieve the effects of increased quantization efficiency, high-efficiency quantization parameters, and increased compression efficiency

Active Publication Date: 2020-07-17
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 wired / wireless broadband line, or when stored, transmission costs and storage costs may increase

Method used

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  • An image coding apparatus and method thereof based on a quantization parameter derivation
  • An image coding apparatus and method thereof based on a quantization parameter derivation
  • An image coding apparatus and method thereof based on a quantization parameter derivation

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Embodiment Construction

[0027] According to an embodiment of the present invention, there is provided a picture decoding method performed by a decoding device. The method includes: decoding image information including information about a quantization parameter (QP); deriving an expected average luminance value for the current block from neighboring available samples; Quantization parameter offset (QP offset) of a parameter (luminance QP); deriving a luma QP based on the QP offset; performing inverse quantization on a quantization group including the current block based on the derived luma QP; generating a QP of the current block based on the inverse quantization a residual sample; generating a prediction sample of the current block based on the image information; and generating a reconstructed sample of the current block based on the residual sample of the current block and the prediction sample of the current block.

[0028] Mode of the invention

[0029] While the present invention can be modified...

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Abstract

According to an embodiment of the present invention, a picture decoding method performed by a decoding apparatus is provided. The method comprises: decoding image information comprising information ona quantization parameter (QP), deriving an expected average luma value of a current block from neighboring available samples, deriving a quantization parameter offset (QP offset) for deriving a lumaquantization parameter (luma QP) based on the expected average luma value and the information on the QP, deriving the luma QP based on the QP offset, performing an inverse quantization for a quantization group comprising the current block based on the derived luma QP, generating residual samples for the current block based on the inverse quantization, generating prediction samples for the currentblock based on the image information and generating reconstructed samples for the current block based on the residual samples for the current block and the prediction samples for the current block.

Description

technical field [0001] The present invention relates to image coding technology. More specifically, the present invention relates to an image encoding device and method thereof based on quantization parameter derivation in an image encoding system. Background technique [0002] Demands for high-resolution, high-quality images such as high-definition (HD) images and ultra-high-definition (UHD) images have recently increased in various fields. As image data has high resolution and high quality, the amount of information or bits to be transmitted increases relative to existing image data. Therefore, when image data is transmitted using a medium such as a wired / wireless broadband line, or when stored, transmission costs and storage costs may 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]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04N19/124H04N19/186H04N19/117H04N19/176H04N19/132
CPCH04N19/186H04N19/117H04N19/124H04N19/70H04N19/132H04N19/176H04N19/196
Inventor 金昇焕林宰显
Owner LG ELECTRONICS INC
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