Adaptive Intra Prediction Precision for Video Coding Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current video compression techniques, such as VVC, face a degradation in coding efficiency due to the need to encode numerous directional indexes, which increases data complexity and storage requirements, especially with increasing image sizes, resolutions, and frame rates.
Innovation Solution
A video encoding method and apparatus that adaptively select precision modes for intra prediction directionality based on the directional prediction modes of neighboring blocks, using flags to determine precision for directionality, thereby optimizing coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If VVC technology uses intra prediction based on 65 directions obtained by subdividing an angle, then prediction performance is improved, but coding efficiency is degraded due to additional encoding of indexes
Solution Approach 1:
The patent applies dynamics by making the precision mode adaptive rather than fixed. The encoder dynamically selects between first precision mode (higher precision) and second precision mode (lower precision) based on the characteristics of the current block and neighboring blocks. This dynamic adaptation allows the system to use higher precision only when necessary for prediction performance while using lower precision elsewhere to maintain coding efficiency.
Solution Approach 2:
The patent implements local quality by applying different precision modes to different spatial regions. Specifically, the encoder determines whether to use first precision mode or second precision mode for each current block based on local characteristics such as the intra prediction modes of neighboring blocks. This allows higher precision to be applied locally where it improves prediction accuracy while using lower precision in other regions to reduce encoding overhead.
2Measurement precision
If image size, resolution, and frame rate are increased, then video quality is improved, but the amount of data to be encoded increases
Solution Approach 1:
The patent applies parameter changes by modifying the precision parameter of intra prediction based on block characteristics. Instead of using a fixed precision for all blocks, the system changes the precision parameter dynamically - using first precision mode for blocks where higher accuracy is needed and second precision mode for blocks where lower precision suffices. This parameter adaptation reduces the overall data quantity while maintaining image quality.
Solution Approach 2:
The patent implements partial action by applying high-precision prediction only to the extent necessary. Rather than using the highest precision (65 directions) for all blocks, the system applies first precision mode only to blocks where it provides significant benefit, while using second precision mode for other blocks. This partial application of high precision reduces the total data amount while maintaining acceptable image quality.
Data Source
AI summary
A method and an apparatus for video coding using adaptive intra prediction precision are disclosed. The video coding method and the apparatus select a precision mode for directionality of an intra prediction mode of a current block according to directional prediction modes of restored neighboring blocks. The video coding method and the apparatus adaptively use precision of the directionality based on the selected precision mode in intra prediction of a current block.