UMVE Motion Vector Candidate Expansion for Video Coding
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Solution Overview
Problem
Current video coding technologies, such as HEVC, face challenges in improving coding performance and reducing complexity related to Inter prediction, particularly in the UMVE expansion process.
Innovation Solution
The method involves selecting a base candidate from an original Inter candidate list and deriving extended candidates by adding offsets in multiple directions, including horizontal, vertical, and diagonal directions, to form an extended Inter candidate list for encoding or decoding motion information, with the UMVE mode flag enabling additional motion information signaling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the UMVE candidate list is expanded by adding offset vectors in multiple directions, then motion vector prediction accuracy is improved, but computational complexity increases
Solution Approach 1:
The candidate list generation process is segmented into multiple stages: first generating base candidates from neighboring blocks, then selectively expanding with offset vectors in specific directions (horizontal, vertical, diagonal) based on motion characteristics. This segmentation allows the system to achieve comprehensive coverage without uniformly processing all possible directions, thus reducing overall complexity while maintaining accuracy.
Solution Approach 2:
Instead of exhaustively searching all possible motion vector directions, the patent applies partial action by selecting and expanding only in the most promising directions (typically 3-4 key directions) based on preliminary motion analysis. This partial expansion achieves sufficient prediction accuracy without the excessive computational cost of complete directional coverage.
2Productivity
If multiple offset vectors are added to expand the candidate list, then coding performance is improved, but signaling overhead increases
Solution Approach 1:
The patent performs preliminary action by pre-defining a set of standard offset vectors with common magnitudes and directions before the actual candidate list construction. These pre-defined offsets are stored in lookup tables or configuration structures, allowing the encoder and decoder to reconstruct the same candidate lists without transmitting the offset values explicitly, thereby reducing signaling overhead while maintaining coding performance.
Data Source
AI summary
A method and apparatus of Inter prediction for video coding using UMVE (Ultimate Motion Vector Expression) are disclosed. According to this method, a base candidate is selected from an original Inter candidate list, where the base candidate has a base prediction direction. One or more extended candidates are derived by adding one or more offsets to the base candidate, where said one or more extended candidates have a same prediction direction as the base prediction direction. The extended candidates are then inserted into the original Inter candidate list to form an extended Inter candidate list for encoding or decoding. According to another method, the UMVE mode is treated as an additional AMVP (Advanced Motion Vector Prediction) mode.