Implicit Intra Modes for CIIP and Geometric Video Partitioning
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Solution Overview
Problem
Existing video coding systems face challenges in efficiently determining intra-prediction modes for video blocks, particularly in combined intra-inter prediction scenarios, leading to suboptimal compression and decoding/encoding performance.
Innovation Solution
A method is introduced to determine an intra-prediction mode for a video block based on one or more intra-prediction modes associated with a reference block, incorporating combined intra-inter prediction (CIIP) and geometric partitioning mode (GPM) to enhance prediction accuracy and efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional intra-prediction mode determination methods are used, then the decoding process is simple, but the compression efficiency and video quality are suboptimal
Solution Approach 1:
The patent applies preliminary action by pre-determining and storing candidate intra-prediction modes in a buffer before the actual prediction process. The system prepares multiple candidate modes based on reference block information and selects from these pre-computed candidates, avoiding the need for complex real-time mode determination while achieving improved compression efficiency.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a buffer that stores candidate intra-prediction modes. This buffer acts as a mediator between the reference block analysis and the final prediction mode selection, enabling the system to efficiently determine optimal intra-prediction modes without direct complex calculations during the encoding/decoding process.
2Measurement precision
If combined intra-inter prediction (CIIP) and geometric partitioning mode (GPM) are implemented, then prediction accuracy improves, but the processing complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the video block into multiple portions, where some portions are processed using intra-prediction modes while others use inter-prediction modes. This geometric partitioning allows different prediction techniques to be applied to different regions, improving overall prediction accuracy while managing complexity through structured division.
Solution Approach 2:
The patent merges intra-prediction and inter-prediction techniques into a unified combined prediction framework. By integrating CIIP and GPM capabilities, the system can selectively apply appropriate prediction methods to different block portions, achieving improved prediction accuracy through consolidation of multiple prediction approaches rather than treating them as separate independent processes.
Data Source
AI summary
A device may obtain a reference block associated with an inter prediction of a video block. The device may determine an intra-prediction mode associated with the video block based on one or more intra-prediction modes associated with the reference block. The device may decode or encode the video block based on the intra-prediction mode. In examples, the device may decode or encode the video block using an intra prediction and the inter prediction, and the intra prediction of the video block may be based on the intra-prediction mode. For example, combined intra-inter prediction (CIIP) may be enabled for the video block. CIIP for the video block may include the intra prediction of the video block and the inter prediction of the video block. The intra prediction of the video block may be based on the intra-prediction mode.