Chroma Intra Prediction Mode Derivation for Coding Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The increasing demand for high-resolution, high-quality images such as HD and UHD images poses a challenge due to the increased amount of information required for transmission and storage, leading to higher costs for transmission and storage.
Innovation Solution
An image decoding method and apparatus that enhances image coding efficiency by deriving intra prediction modes for chroma components based on neighboring blocks, using intra prediction candidate modes to improve prediction accuracy and overall coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted or stored using conventional methods, then image quality is maintained, but transmission cost and storage cost increase
Solution Approach 1:
The patent applies parameter changes by transforming image data into frequency domain representations (transform coefficients) through mathematical transformations. This changes the representation parameters from spatial domain pixel values to frequency domain coefficients, enabling more efficient compression while preserving image quality. The transform coefficients allow selective retention of important frequency information and discarding of less significant details.
2Loss of energy
If conventional image compression techniques are used, then transmission and storage costs are reduced, but image coding efficiency is insufficient
Solution Approach 1:
The patent applies segmentation by dividing the image into multiple blocks or regions and processing each block independently through separate transformation and compression operations. This block-based approach allows parallel processing, improves coding efficiency, and enables adaptive application of different compression strategies to different image regions based on their characteristics.
Solution Approach 2:
The patent transforms image data from spatial domain to frequency domain using mathematical transforms, changing the representation parameters to enable more efficient compression. This parameter transformation allows the system to identify and retain only the most significant image information while discarding redundant data, thereby improving coding efficiency.
3Device complexity
If intra prediction modes are derived without using neighboring chroma block information, then decoding complexity is reduced, but prediction accuracy decreases
Solution Approach 1:
The patent applies preliminary action by pre-deriving and storing intra prediction candidate modes from neighboring chroma blocks during the encoding phase. These candidate modes are prepared in advance and made available for reference during decoding, allowing the decoder to select from pre-computed options without performing complex derivations, thus maintaining low decoding complexity while improving prediction accuracy.
Solution Approach 2:
The patent applies copying by replicating the intra prediction mode information from neighboring chroma blocks to create candidate modes for the current block. Instead of independently deriving prediction modes for each block, the system copies and adapts modes from spatially adjacent blocks that are likely to have similar characteristics, reducing computational complexity while maintaining accuracy.
Data Source
AI summary
The image decoding method performed by a decoding apparatus, according to the present invention, comprises the steps of: receiving intra prediction mode information of a current chroma block; deriving intra prediction candidate modes of the current chroma block on the basis of a neighboring chroma block of the current chroma block; deriving an intra prediction mode of the current chroma block on the basis of the intra prediction mode information and the intra prediction candidate modes; and predict the current chroma block on the basis of the intra prediction mode, wherein the intra prediction candidate modes include an intra prediction mode applied to a neighboring chroma block of the current chroma block.