Bidirectional Inter Prediction Motion Information Derivation
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Solution Overview
Problem
In video coding technology, bidirectional inter prediction requires transmitting motion information in both directions, leading to a high occupancy of transmission resources, reduced transmission rates, and decreased coding compression efficiency.
Innovation Solution
A method and apparatus for bidirectional inter prediction, where the encoder sends only the indication information and the first motion information, allowing the decoder to calculate the second motion information, thereby reducing the amount of motion information in the bitstream.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion information of each picture block in each direction is transmitted in bidirectional inter prediction, then the prediction accuracy is improved, but the transmission resource occupancy increases and coding compression efficiency decreases
Solution Approach 1:
The patent extracts and transmits only the necessary motion information (first motion information in a first direction) while deriving the second motion information (in a second direction) through calculation. This removes redundant transmission of complete bidirectional motion data while preserving prediction accuracy through mathematical relationships between motion vectors in different directions.
Solution Approach 2:
The patent creates a copy or derivation of the second motion information from the first motion information through calculation relationships. Instead of transmitting independent second motion information, the system uses the first motion information to generate the second direction's motion data, reducing transmission overhead while maintaining prediction quality.
2Measurement precision
If motion information of each picture block in each direction is transmitted in bidirectional inter prediction, then the prediction accuracy is improved, but the transmission rate decreases
Solution Approach 1:
The patent extracts only the essential first motion information for transmission, excluding redundant second motion information that can be derived through calculation. This extraction approach reduces the volume of transmitted data, thereby improving transmission rate while maintaining the ability to achieve accurate bidirectional prediction at the decoder side.
3Measurement precision
If motion information of each picture block in each direction is transmitted in bidirectional inter prediction, then the prediction accuracy is improved, but the coding compression efficiency decreases
Solution Approach 1:
The patent removes redundant motion information from the bitstream by transmitting only the first motion information and deriving the second motion information through calculation relationships. This reduction in transmitted data volume directly improves coding compression efficiency while preserving bidirectional prediction accuracy through the derived motion vectors.
Data Source
AI summary
Embodiments of this application relate to the field of video picture coding technologies, and disclose a bidirectional inter prediction method and apparatus, to improve coding efficiency. The method includes: obtaining indication information, where the indication information is used to indicate that second motion information is determined based on first motion information, the first motion information is motion information of a current picture block in a first direction, and the second motion information is motion information of the current picture block in a second direction; obtaining the first motion information; determining the second motion information based on the first motion information; and determining prediction samples of the current picture block based on the first motion information and the second motion information.