Combined Inter Intra Prediction Mode Selection
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Solution Overview
Problem
Existing video coding systems face challenges in achieving optimal coding efficiency, particularly for video content with mixed old and new objects, where the combination of inter and intra predictions is not fully optimized.
Innovation Solution
The proposed solution involves a video coding device that utilizes a combined inter and intra prediction mode, enabling the selection of intra modes based on prediction samples and applying weights to combine inter and intra prediction samples, thereby improving coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If combined inter and intra prediction is applied, then coding efficiency is improved, but prediction accuracy for mixed content deteriorates
Solution Approach 1:
The patent implements dynamic mode selection where the prediction mode (inter, intra, or combined) is adaptively chosen for each coding unit based on content characteristics. The system dynamically switches between prediction strategies to optimize both coding efficiency and prediction accuracy for different video content regions, particularly for mixed old and new objects.
Solution Approach 2:
The patent applies different prediction modes to different regions of the video content. For regions containing mixed old and new objects, the system selectively applies combined inter and intra prediction with specific intra mode derivation, while other regions may use traditional inter or intra prediction, thereby optimizing local prediction quality throughout the video frame.
2Productivity
If triangle merge mode is enabled, then coding efficiency is improved, but complexity of mode selection increases
Solution Approach 1:
The patent performs preliminary determination of triangle merge mode eligibility based on MMVD mode indication and CIIP indication before full mode selection. By pre-assessing which coding units are candidates for triangle merge mode using available flags and indications, the system reduces the search space and simplifies subsequent mode selection, thereby reducing complexity while maintaining coding efficiency benefits.
Data Source
AI summary
Systems, methods, and instrumentalities are disclosed for a combined inter and intra prediction. A video coding device may receive a motion vector difference (MMVD) mode indication that indicates whether MMVD mode is used to generate inter prediction of a coding unit (CU). The video coding device may receive a combined inter merge/intra prediction (CIIP) indication, for example, when the MMVD mode indication indicates that MMVD mode is not used to generate the inter prediction of the CU. The video coding device may determine whether to use triangle merge mode for the CU, for example, based on the MMVD mode indication and/or the CIIP indication. On a condition that the CIIP indication indicates that CIIP is applied for the CU or the MMVD mode indication indicates that MMVD mode is used to generate the inter prediction, the video coding device may disable the triangle merge mode for the CU.