Disparity Vector Alignment for 3D Video Coding
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Solution Overview
Problem
Conventional 3D video coding systems face issues where derived disparity vectors (DV) are associated with reference views different from the selected reference views, leading to incorrect usage of reference data in tools like TIVC, DIVC, IVRP, and VSP, especially when inter-view reference pictures other than the base view are allowed.
Innovation Solution
The solution involves aligning reference information by modifying the selected reference view or the derived DV, using techniques such as scaling the DV or converting depth values to match the selected reference view, ensuring that the reference view index aligns with the view index of the depth block, thereby correcting the reference data usage in DV derivation processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If disparity vectors are derived using conventional methods without aligning reference view indices, then the coding process is simpler and faster, but the reference data usage becomes incorrect leading to poor coding performance
Solution Approach 1:
The patent applies preliminary action by performing reference view alignment before using disparity vectors in coding tools. The method checks whether the reference view index of a derived DV matches the required reference view index, and if not, it converts the DV to the correct reference view beforehand. This ensures that when DVs are used in TIVC, DIVC, IVRP, or VSP tools, the reference data is correctly aligned, preventing coding errors and improving performance.
Solution Approach 2:
The patent employs parameter changes by modifying the reference view index parameter of disparity vectors. When a DV is derived with a reference view index that differs from the required index, the patent converts the DV by adjusting its reference view index parameter to match the required view. This parameter transformation ensures correct reference data usage while maintaining the efficiency of inter-view prediction.
2Adaptability or versatility
If inter-view reference pictures other than the base view are allowed, then the adaptability of the coding system is improved, but the risk of reference view mismatch and incorrect data usage increases
Solution Approach 1:
The patent implements feedback by continuously checking whether the reference view index of a derived disparity vector matches the required reference view index before using it in coding tools. This feedback mechanism detects potential mismatches and triggers a conversion process to align the reference views, ensuring that the increased adaptability of selecting various inter-view reference pictures does not compromise the accuracy of reference data usage.
Data Source
AI summary
A method and apparatus of three-dimensional/multi-view coding using aligned reference information are disclosed. The method operates by receiving input data associated with a current block of a current frame in a dependent view, determining a first DV (Disparity Vector) from one or more neighboring blocks of the current block, wherein the first DV refers to a first reference view to derive first reference information, selecting a second reference view for the current block to derive second reference information, aligning the first reference information associated with the first reference view with the second reference information associated with the second reference view, and applying inter-view encoding or decoding to the input data utilizing the first DV or the second reference information after applying said aligning the first reference information with the second reference information.