Image decoding method, image encoding method, and transmission method for image data

By using CU-level chromaticity quantization parameter offset information in the image decoding method, chromaticity QP is derived and residual samples are generated, the problem of low image encoding efficiency in the prior art is solved, and the effect of reducing transmission and storage costs is achieved.

CN119653085APending Publication Date: 2025-03-18LG ELECTRONICS INC
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Patent Information

Application Number
CN202510020145.6
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Priority Date
2019-08-22
Filing Date
2020-08-20
Publication Date
2025-03-18

AI Technical Summary

Technical Problem

The prior art is difficult to effectively improve image encoding efficiency, especially when processing high-resolution, high-quality images, resulting in increased transmission and storage costs.

Method used

In the image decoding method, CU-level chromaticity quantization parameter (QP) offset related information is obtained based on the tree type and size of the current chromaticity block, chroma QP for the current chromaticity block is derived, and the residual sample is derived based on the QP, and finally a reconstructed picture is generated.

Benefits of technology

Even if the first transformation block in the current chromaticity block does not include a non-zero transformation coefficient level, transmitting the CU chromaticity QP offset information through the signal can reduce the cost of configuring the decoding device and reduce the cache requirement of the decoding device.

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Abstract

The invention relates to an image decoding method, an image encoding method, and a transmission method for image data. An image decoding method performed by a decoding device according to the present document comprises the steps of: obtaining CU chroma QP offset related information for a current chroma block based on a size and a tree type of the current chroma block; deriving a chroma QP for the current chroma block based on the CU chroma QP offset related information; deriving a residual sample for the current chroma block based on the chroma QP; and generating a reconstructed picture based on the residual sample, wherein the CU chroma QP offset related information includes a CU chroma QP offset flag and a CU chroma QP offset index for the current chroma block.
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