Multiple-Hypothesis Temporal Prediction via Derived Motion Vectors
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Solution Overview
Problem
The transmission of complete motion vector information in video coding is inefficient and consumes unnecessary bandwidth, particularly in systems like JVET and VVC that require multiple motion vectors for encoding and reconstruction.
Innovation Solution
A system and method to reduce overhead by determining relationships between motion vectors, allowing the second motion vector to be derived from the first, thereby reducing the need to signal all motion vector information explicitly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If complete motion vector information is transmitted for multiple motion vectors, then coding accuracy is improved, but bandwidth consumption increases
Solution Approach 1:
The patent extracts and transmits only the essential relationship information between motion vectors rather than complete motion vector data. By identifying and transmitting only the differential or relationship parameters that define how motion vectors relate to each other, the system achieves accurate reconstruction with reduced bandwidth consumption.
Solution Approach 2:
The patent uses a reference motion vector as a base and derives other motion vectors through relationship information. Instead of transmitting complete independent motion vector data, the system transmits a reference vector and relationship descriptors that allow the decoder to reconstruct additional motion vectors through computational derivation.
2Measurement precision
If multiple motion vectors are explicitly signaled, then prediction accuracy is improved, but overhead increases
Solution Approach 1:
The patent changes the parameter representation from complete motion vector data to relationship descriptors. By transforming the information format from absolute motion vector values to relative relationship parameters (such as differentials or scaling factors), the system reduces the number of bits required to represent the same predictive information.
Solution Approach 2:
The patent performs preliminary derivation of motion vector relationships at the encoder side and transmits only the essential relationship parameters. The decoder then uses these pre-computed relationship parameters to reconstruct the full set of motion vectors, eliminating the need to transmit all motion vector components explicitly.
3Measurement precision
If all motion vector data is transmitted, then reconstruction accuracy is improved, but transmission efficiency deteriorates
Solution Approach 1:
The patent introduces relationship information as an intermediary between the encoder and decoder. Instead of directly transmitting complete motion vector data, the system transmits relationship descriptors that mediate the reconstruction process, allowing the decoder to compute accurate motion vectors through derivation from a reference vector and these relationship parameters.
Data Source
AI summary
A method is provided for inter-coding video in which transmission bandwidth requirements associated with second motion vectors for bi-directional temporal prediction is reduced. In the method, vector information for one of motion vectors for multi-directional temporal prediction can be transmitted together with information on how to derive or construct the second motion vectors. Thus, rather than sending express information regarding each of the plurality of motion vectors, express information related to only one motion vector along with information related to reconstruction/derivation of the second motion vectors is transmitted, thus reducing bandwidth requirements and increasing coding efficiency.