Method for decoding or encoding image and method for transmitting image data

Through the decoding method of video signals, diagonal scanning and residual coefficient adjustment index are used to optimize the encoding/decoding process of video signals, solve the problem of high cost of transmission and storage of high-resolution video signals, and improve the encoding/decoding efficiency.

CN116600141BActive Publication Date: 2025-09-23KT CORP
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Patent Information

Application Number
CN202310737223.5
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Priority Date
2018-03-27
Filing Date
2019-03-27
Publication Date
2025-09-23
Estimated Expiration
2039-03-27

AI Technical Summary

Technical Problem

The existing technology has low encoding/decoding efficiency when processing high-resolution and high-quality video signals. In particular, when splitting the encoding/decoding target blocks, prediction target blocks or transformation target blocks, it is difficult to effectively manage the size/shape differences, resulting in increased transmission and storage costs.

Method used

When decoding the video signal, the scanning order of the current block and the residual coefficient adjustment index are used to determine whether the absolute value of the non-zero residual coefficient is equal to or less than the residual coefficient adjustment reference value, and the encoding/decoding method of the residual coefficient is adaptively determined based on the size and position of the current block, and diagonal scanning is used to generate coefficient level information.

Benefits of technology

The encoding/decoding efficiency is improved, and the encoding/decoding process is optimized through symmetric or asymmetric block splitting and adaptive residual coefficient coding, thereby reducing transmission and storage costs.

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Abstract

Provided are a method for decoding or encoding an image and a method for transmitting image data. The method for decoding an image includes: determining whether at least one non-zero residual coefficient is included in a current transform block; and in response to determining that at least one non-zero residual coefficient is included in the current transform block, obtaining a residual coefficient of the current transform block according to a scanning order of the current transform block, wherein the scanning order is determined based on diagonal scanning, wherein the residual coefficient of the current transform block is obtained based on coefficient level information of the current transform block, wherein the coefficient level information includes at least one of a first residual level flag, a parity flag, and a second residual level flag, wherein the parity flag and the second residual level flag are signaled via a bitstream only when the first residual level flag indicates that the absolute value of the residual coefficient is greater than 1.
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Citation Information

Patent Citations

  • Vidio signal encoding method

    CN104378637A

  • Method for encoding / decoding image and device therefor

    WO2016200234A1