Video Block Intra-Prediction Mode Selection
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Solution Overview
Problem
Current video coding technologies, such as HEVC and VVC, have limitations in accurately encoding and decoding video blocks due to a limited number of conventional intra-prediction modes (IPMs), which can lead to suboptimal prediction and increased bitstream size.
Innovation Solution
The method involves constructing a template set for a current video block from multiple sub-templates, deriving multiple intra-prediction modes (IPMs) based on cost calculations, and determining a final predictor to improve encoding and decoding accuracy by allowing for more precise prediction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional intra-prediction modes are used, then device complexity is reduced, but prediction accuracy deteriorates leading to increased bitstream size
Solution Approach 1:
The patent segments the prediction process by dividing the current block into multiple regions and constructing separate template sets for each region. Multiple intra-prediction modes are derived for different regions independently, allowing each region to use the most appropriate prediction mode for its local characteristics, thereby improving overall prediction accuracy without uniformly increasing complexity across the entire block.
Solution Approach 2:
The patent introduces dynamic selection of intra-prediction modes based on cost calculations. Instead of using a fixed set of conventional modes, the system dynamically derives multiple IPMs from template sets and selects the optimal mode for each region based on prediction error metrics, enabling adaptive prediction that improves accuracy while managing complexity through selective application.
2Measurement precision
If multiple intra-prediction modes are derived, then prediction accuracy is improved, but computational cost increases
Solution Approach 1:
The patent applies partial action by deriving multiple intra-prediction modes only for specific regions where it provides benefit, rather than uniformly across the entire block. The template set construction and multiple IPM derivation are performed selectively based on regional characteristics, reducing unnecessary computational energy while maintaining encoding accuracy where it matters most.
Solution Approach 2:
The patent changes the parameter of prediction mode quantity from a fixed conventional set to a dynamically determined set based on template matching results. By adjusting the number and type of IPMs derived according to local image characteristics and cost calculations, the system optimizes the balance between encoding accuracy and computational energy consumption.
3Measurement precision
If multiple template sets are constructed, then prediction precision is improved, but processing time increases
Solution Approach 1:
The patent segments the template set construction process by creating separate template sets for different regions of the current block rather than constructing a single comprehensive template set. This segmentation allows parallel processing of different regions and reduces the processing time required for template matching while maintaining prediction precision through region-specific template selection.
Solution Approach 2:
The patent performs preliminary construction of template sets from available neighboring blocks before the actual prediction mode derivation. By pre-processing and organizing template data in advance, the system reduces the processing time required during the main prediction phase, as the template matching and cost calculations can proceed more efficiently with pre-organized data.
Data Source
AI summary
Aspects include a method, apparatus and computer-readable medium of decoding video or blocks of an image, including receiving a bitstream of the image, deriving, for a block of the image in the bitstream, multiple intra-prediction modes (IPMs) to use in decoding the block, determining, based on the multiple IPMs, a final predictor to use in decoding the block, and decoding the block using the final predictor. Other aspects include method, apparatus and computer-readable medium for similarly encoding video or blocks of an image.