Chroma Intra-Prediction Mode Derivation via Luma Block Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing image encoding/decoding techniques face challenges in efficiently encoding and decoding high-resolution and high-quality images, leading to increased transmission and storage costs due to the large amount of data involved.
Innovation Solution
The proposed method involves an image decoding method that derives the intra-prediction mode of a current luma block and uses it to determine the intra-prediction mode of a current chroma block. This method includes determining whether Cross-Component Linear Mode (CCLM) can be performed for the current chroma block based on the size of the luma block or the coding tree block, and generating a prediction block for the chroma block using the derived intra-prediction mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high resolution and quality images are used, then image quality is improved, but transmission cost and storage cost increase due to large amount of data
Solution Approach 1:
The patent extracts and utilizes the intra-prediction mode of the luma block to determine the intra-prediction mode of the chroma block, thereby extracting useful predictive information from one component to reduce redundancy in another component
Solution Approach 2:
The patent merges the prediction process of luma and chroma blocks by using the luma block's intra-prediction mode to directly determine the chroma block's intra-prediction mode, combining two separate prediction operations into one unified approach
2Productivity
If existing image encoding techniques are used, then encoding process is simple, but encoding/decoding efficiency is insufficient for high resolution images
Solution Approach 1:
The patent performs preliminary action by deriving the intra-prediction mode of the luma block before processing the chroma block, using this pre-derived information to efficiently determine the chroma block's prediction mode without requiring separate complex analysis
Solution Approach 2:
The chroma block's intra-prediction mode is determined self-service by directly utilizing the luma block's intra-prediction mode, where the luma block's prediction information automatically serves the chroma block's prediction needs
Data Source
AI summary
An image encoding/decoding method is provided. An image decoding method of the present invention may comprise deriving an intra-prediction mode of a current luma block, deriving an intra-prediction mode of a current chroma block based on the intra-prediction mode of the current luma block, generating a prediction block of the current chroma block based on the intra-prediction mode of the current chroma block, and the deriving of an intra-prediction mode of a current chroma block may comprise determining whether or not CCLM (Cross-Component Linear Mode) can be performed for the current chroma block.