Intra-prediction Mode Propagation for Video Coding Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current video encoding and decoding technologies face challenges in efficiently propagating intra-prediction modes to inter-coded blocks, leading to suboptimal compression and increased bit rates due to the need to signal intra-prediction mode information for each block, which limits the availability of intra-prediction modes for neighboring blocks.
Innovation Solution
The proposed solution involves associating an intra-prediction mode with inter-predicted blocks based on intra-prediction modes from collocated or reference blocks, allowing for the derivation and propagation of intra-prediction modes across blocks, thereby reducing the need to signal intra-prediction mode information and increasing the availability of modes for neighboring blocks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If intra-prediction mode information is signaled for each block, then prediction accuracy is maintained, but bit rate increases and coding efficiency decreases
Solution Approach 1:
The patent applies copying by deriving intra-prediction mode information for inter-coded blocks from neighboring blocks (intra or inter coded) rather than signaling it explicitly. The intra-prediction mode of an inter-coded block is copied from a neighboring block that has available intra-prediction mode information, thereby avoiding the need to transmit redundant mode information for each block individually.
Solution Approach 2:
The patent extracts intra-prediction mode information from neighboring blocks and applies it to inter-coded blocks. By taking out the intra-prediction mode from the context of individual block signaling and making it available through propagation from neighboring blocks, the system reduces the bit rate while maintaining prediction accuracy.
2Device complexity
If intra-prediction modes are limited to intra-coded blocks, then signaling complexity is reduced, but availability of modes for neighboring blocks decreases
Solution Approach 1:
The patent makes intra-prediction mode information universal by allowing it to be derived not only from intra-coded blocks but also from inter-coded blocks through the propagation mechanism. This multi-functionality enables any neighboring block with available intra-prediction mode information to serve as a source for derivation, increasing mode availability while maintaining manageable signaling complexity.
Solution Approach 2:
The patent ensures continuity of useful action by propagating intra-prediction mode information across neighboring blocks regardless of whether they are intra or inter coded. This continuous availability of mode information through propagation maintains prediction accuracy across the entire block structure without requiring separate signaling for each block type.
3Productivity
If intra-prediction modes are propagated to inter-coded blocks, then coding efficiency improves, but mode determination accuracy may be affected
Solution Approach 1:
The patent implements feedback mechanisms where the derived intra-prediction mode can be used to improve prediction accuracy, and the effectiveness can be evaluated and fed back into the coding process. This feedback loop ensures that mode propagation maintains coding efficiency while preserving the accuracy needed for reliable video reconstruction.
Data Source
AI summary
A method of decoding video data, including receiving a first block of video data encoded using an inter-prediction mode associating a first intra-prediction mode with the first block of video data, wherein the first intra-prediction mode is associated with a second block of video data, and determining a second intra-prediction mode for a neighbor block of video data based at least in part on the first intra-prediction mode.