Subblock-Based Temporal Motion Vector Prediction for Video Coding
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Solution Overview
Problem
The increasing demand for high-resolution and high-quality images and videos, such as UHD images and videos of 4K or 8K, poses a challenge due to the increased amount of information that requires efficient compression and transmission/storage solutions, especially for immersive media like VR and AR content.
Innovation Solution
The proposed solution involves a subblock-based temporal motion vector prediction (sbTMVP) method that efficiently derives motion vectors for subblocks, using a center sample position to calculate corresponding positions for both sub-coding block and coding block levels, thereby improving prediction performance and reducing calculation complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If subblock-based temporal motion vector prediction is performed using separate calculation methods for sub-coding block and coding block levels, then prediction precision is improved, but device complexity increases
Solution Approach 1:
The patent merges the separate calculation methods for sub-coding block level and coding block level into a unified corresponding position calculation method. Both levels now use the same formula based on center sample positions, eliminating the need for separate handling while maintaining prediction accuracy through the center-based approach.
Solution Approach 2:
The unified corresponding position calculation method serves both sub-coding block level and coding block level universally. The same calculation logic derived from center sample positions is applied across different block sizes and levels, simplifying the overall system while preserving functionality.
2Manufacturing precision
If high-resolution and high-quality image and video data are transmitted or stored using existing media, then image and video quality is improved, but transmission costs and storage costs increase
Solution Approach 1:
The patent segments the video coding process into subblock-based temporal motion vector prediction units. By dividing the coding block into subblocks and performing independent motion vector prediction for each, the method achieves better compression efficiency for high-resolution content, reducing the bitrate required for transmission and storage while maintaining quality.
Data Source
AI summary
According to the disclosure of this document, in subblock-based temporal motion vector prediction (sbTMVP), a subblock position for deriving a motion vector in units of a subblock can be efficiently calculated, and through this, video/image coding efficiency can be improved and hardware implementation can be simplified.