Image Decoding Device Geometric Partitioning Mode Intra Prediction
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Solution Overview
Problem
The existing geometric partitioning mode (GPM) in image decoding is limited to inter prediction, leaving room for improvement in coding performance, particularly when an intra prediction mode is not incorporated.
Innovation Solution
An image decoding device and method that includes an inter prediction unit for deriving motion information and an intra prediction unit for generating intra prediction samples, with a prediction information buffer to store and output motion or intra prediction modes, allowing for the selection of intra prediction modes based on adjacent reference samples or blocks and the partition shape of the geometric partitioning mode.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If geometric partitioning mode is limited to inter prediction only, then device complexity is reduced, but coding performance is insufficient
Solution Approach 1:
The prediction unit is designed to perform both inter prediction and intra prediction functions within the same geometric partitioning mode framework. The intra prediction unit derives intra prediction modes based on adjacent reference samples or blocks, while the inter prediction unit handles motion compensation. Both prediction types can be applied to partitioned blocks, making the system versatile and improving coding performance without requiring separate dedicated prediction paths.
2Productivity
If multiple intra prediction modes are derived and selected, then coding performance is improved, but device complexity increases
Solution Approach 1:
The system changes the parameter of prediction mode selection by deriving multiple intra prediction modes based on different characteristics of adjacent reference samples or blocks. A selection mechanism uses predetermined indices to choose from the derived modes, allowing the system to adapt to different image contents while maintaining manageable complexity through structured parameter variation rather than unstructured mode multiplication.
Data Source
AI summary
An image decoding device according to the present invention includes a circuit, wherein the circuit: derives motion information for a geometric partitioning mode to generate a motion compensation sample; and derives an intra prediction mode for the geometric partitioning mode to generate an intra prediction sample, the circuit: derives a plurality of the intra prediction modes on the basis of adjacent reference samples or adjacent reference blocks adjacent to the block to be decoded, and selects, with use of a signaled index, one or a plurality of intra prediction modes from an intra prediction mode candidate list including the plurality of derived intra prediction modes to generate the intra prediction sample.