Geometric Partition Mode Prediction Inference
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Solution Overview
Problem
Current video coding technologies face challenges in efficiently determining the prediction mode for video blocks, particularly when the number of neighboring reconstructed samples is limited, leading to suboptimal compression ratios and increased bit requirements.
Innovation Solution
The method involves partitioning video blocks using a geometric partition mode (GPM) and determining prediction modes based on the number of adjacent reconstructed samples, inferring inter or intra prediction modes without explicit signaling, and restricting intra prediction modes for geometric partitions with insufficient neighboring samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If intra prediction mode is used for geometric partition blocks, then coding flexibility and adaptability are improved, but when neighboring reconstructed samples are insufficient, the prediction accuracy deteriorates and bit requirements increase
Solution Approach 1:
The patent dynamically changes the prediction mode parameter based on the availability of neighboring reconstructed samples. When sufficient neighboring samples are available, intra prediction mode is used; when insufficient samples are available, inter prediction mode is used. This parameter adaptation resolves the contradiction by selecting the appropriate prediction mode according to the actual coding conditions.
2Measurement precision
If prediction mode is explicitly signaled in the bitstream, then prediction accuracy is improved, but bit rate increases
Solution Approach 1:
The patent uses the decoder's own capability to infer the prediction mode based on the geometric partition mode and neighboring sample availability, without requiring explicit signaling in the bitstream. The decoder can determine whether to use intra or inter prediction mode by checking the number of available neighboring reconstructed samples, thereby achieving accurate prediction mode selection while minimizing bit rate.
3Manufacturing precision
If geometric partition mode is applied to all blocks, then coding precision is improved, but device complexity increases
Solution Approach 1:
The patent applies geometric partition mode selectively rather than uniformly to all blocks. By evaluating the availability of neighboring reconstructed samples for each block, the patent applies geometric partitioning only where it can provide benefit (when sufficient neighboring samples are available), thereby improving coding precision while avoiding unnecessary complexity in blocks where it would not be effective.
Data Source
AI summary
An apparatus includes processing circuitry that is configured to receive a bitstream including coded information of a current block. The processing circuitry is configured to partition the current block into a first partition and a second partition based on a geometric partition mode (GPM). The processing circuitry is configured to determine a first prediction mode for the first partition based on a first number of direct neighboring reconstructed samples of the current block being larger than a threshold value. The processing circuitry is configured t0, when the first number of direct neighboring reconstructed samples of the current block is less than the threshold value, infer that the first prediction mode is inter prediction mode, a flag indicating whether the current block is intra coded or inter coded not being signaled in the bitstream, and reconstruct the first partition of the current block based on the first prediction mode.