Chroma Block Prediction Using Reconstructed Luma for Image Coding
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Solution Overview
Problem
High-resolution and high-quality images result in increased data volume, leading to higher transmission and storage costs, and existing image compression technologies struggle to efficiently handle stereo-scopic image contents.
Innovation Solution
Predict a chroma block using a reconstructed luma block by adjusting an initial prediction parameter based on the linearity of luma and chroma components, utilizing down-sampled reference samples and parameter adjustment offsets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If high-resolution and high-quality image data is transmitted or stored using existing methods, then image quality is improved, but transmission and storage expenses increase
Solution Approach 1:
The patent merges luma and chroma prediction processes by using reconstructed luma blocks to generate chroma prediction blocks. This integration allows the encoder to exploit correlations between luma and chroma components, achieving better compression efficiency while maintaining high image quality, thus resolving the contradiction between image quality and data volume.
2Quantity of substance
If existing image compression technologies are used, then data volume is reduced, but encoding/decoding efficiency for stereo-scopic image contents deteriorates
Solution Approach 1:
The patent changes the prediction parameter generation approach by introducing adjusted prediction parameters derived from reconstructed luma blocks. This parameter transformation enables more efficient representation of chroma blocks in stereo-scopic content, achieving both data volume reduction and improved encoding/decoding efficiency simultaneously.
3Device complexity
If chroma blocks are predicted using conventional methods, then encoding complexity is reduced, but prediction accuracy deteriorates
Solution Approach 1:
The patent performs preliminary action by generating adjusted prediction parameters from reconstructed luma blocks before chroma block encoding. This pre-computation of accurate prediction parameters based on already-reconstructed luma information improves prediction accuracy without significantly increasing overall encoding complexity, as the luma reconstruction is already performed in the encoding pipeline.
Data Source
AI summary
An image encoding/decoding method according to the present invention comprises deriving an initial prediction parameter for a chroma block; adjusting the initial prediction parameter; and obtaining a prediction block for the chroma block, on the basis of the adjusted prediction parameter and a reconstructed luma block.