Intra Prediction Reference Handling for High-Efficiency Video Coding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing video encoding/decoding technologies face challenges in efficiently determining reference regions and intra prediction modes, particularly for high-resolution and high-quality images, leading to suboptimal compression efficiency.
Innovation Solution
The method and apparatus divide intra prediction modes into MPM candidate groups and non-MPM candidate groups, allowing for adaptive block division and intra prediction mode derivation based on predefined modes and offsets, with options for replacing unavailable pixels with available ones.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If intra prediction modes are divided into MPM candidate groups and non-MPM candidate groups, then intra prediction efficiency is improved, but device complexity increases
Solution Approach 1:
The patent segments intra prediction modes into two distinct candidate groups: MPM (Most Probable Mode) candidates and non-MPM candidates. This segmentation allows the decoder to first check a limited set of MPM candidates (typically 2-6 modes) before considering other modes, significantly reducing the search space and improving prediction efficiency while maintaining manageable complexity through structured organization
Solution Approach 2:
The patent performs preliminary action by pre-defining MPM candidate lists based on neighboring block modes before the actual prediction mode derivation. The MPM candidates are determined in advance using mode information from adjacent blocks (left, above, above-right neighbors), allowing the decoder to quickly eliminate unlikely modes and focus computation on the most probable candidates, thus improving efficiency before the main decoding process
2Measurement precision
If adaptive block division is implemented, then encoding accuracy is improved, but processing time increases
Solution Approach 1:
The patent implements dynamic block division where the prediction block is adaptively divided into sub-blocks based on the size and characteristics of the current block. The division strategy (horizontal, vertical, or no division) is dynamically selected based on block dimensions and content characteristics, allowing the system to optimize between accuracy and processing time by adapting the level of subdivision to each specific block rather than applying a fixed division rule to all blocks
3Measurement precision
If reference region determination is optimized, then prediction accuracy is improved, but computational complexity increases
Solution Approach 1:
The patent applies local quality by determining reference regions specifically for each prediction block based on its position and characteristics. The reference region is defined locally around each block using neighboring pixels from the left, above, and above-right blocks, allowing the prediction to be tailored to local image content rather than using a uniform reference approach, thereby improving accuracy while keeping the reference region scope limited and manageable
Data Source
AI summary
A video encoding/decoding method and device according to the present invention may: determine a reference area for the intra prediction of the current block; derive the intra prediction mode of the current block; and decode the current block on the basis of the reference area and the intra prediction mode.