Sub-PU Inter-View Motion Prediction for 3D Video Coding Efficiency
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Solution Overview
Problem
Existing three-dimensional video coding systems inefficiently utilize motion information from reference views, only utilizing the middle position's motion information for prediction units in dependent views, leading to suboptimal coding efficiency.
Innovation Solution
Implementing sub-PU level inter-view motion prediction by dividing prediction units into smaller sub-PUs, using disparity vectors to locate reference sub-blocks in the reference view, and sharing or scaling motion parameters between sub-PUs to enhance prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If only the middle position's motion information is used for prediction units in dependent views, then the coding method is simple, but the coding efficiency is suboptimal
Solution Approach 1:
The prediction unit (PU) is divided into multiple sub-PUs, and motion information is derived for each sub-PU separately rather than using a single middle position value for the entire PU. This segmentation allows more comprehensive utilization of motion information from the reference view, improving coding efficiency while managing complexity through systematic processing of smaller units
2Productivity
If sub-PU level inter-view motion prediction is implemented by dividing prediction units into smaller sub-PUs, then motion information usage is refined and coding efficiency improves, but decoding time increases
Solution Approach 1:
Dividing the PU into sub-PUs enables more precise motion estimation by utilizing motion information from multiple locations in the reference view, improving coding efficiency through better prediction accuracy
Solution Approach 2:
Different sub-PUs can utilize motion information from their respective local regions in the reference view, allowing each sub-PU to have optimized prediction parameters suited to its specific content characteristics, thereby improving overall prediction accuracy
3Loss of substance
If sub-PU level inter-view motion prediction is implemented, then bitrate is reduced significantly, but decoding time increases
Solution Approach 1:
By segmenting the PU into sub-PUs and deriving motion information for each, the patent achieves more accurate prediction that reduces the residual information needing to be encoded, thereby reducing bitrate while the increased processing is managed through efficient algorithms
Data Source
AI summary
A method for a three-dimensional encoding or decoding system incorporating sub-block based inter-view motion prediction is disclosed. The system utilizes motion or disparity parameters associated with reference sub-blocks in a reference picture of a reference view corresponding to the texture sub-PCU split from a current texture PU (prediction unit) to predict the motion or disparity parameters of the current texture PU. Candidate motion or disparity parameters for the current texture PU may comprise candidate motion or disparity parameters derived for all texture sub-PUs from splitting the current texture PU. The candidate motion or disparity parameters for the current texture PU can be used as a sub-block-based inter-view Merge candidate for the current texture PU in Merge mode. The sub-block-based inter-view Merge candidate can be inserted into a first position of a candidate list.