Weighted Prediction Parameter Coding for Video
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Solution Overview
Problem
Current video coding techniques face inefficiencies in signaling weighted prediction parameters for reference picture lists, leading to increased bandwidth and processing requirements when lists are identical or substantially equivalent.
Innovation Solution
A method where a video coder signals weighted prediction parameters for one reference picture list and determines the parameters for the other list based on the signaled parameters, reducing unnecessary data transmission and processing by exploiting the equivalence of reference picture lists.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If weighted prediction parameters are signaled for both reference picture lists, then prediction accuracy is maintained, but bandwidth consumption and processing complexity increase
Solution Approach 1:
The patent extracts and removes redundant weighted prediction parameter signaling when reference picture lists are identical or substantially equivalent. By detecting list equivalence and eliminating unnecessary parameter transmission for the second list, the solution maintains prediction accuracy while reducing bandwidth consumption and processing complexity.
Solution Approach 2:
The patent introduces a syntax element (flag) that changes the signaling behavior based on reference picture list equivalence. When the flag indicates equivalence, the coder switches from signaling parameters for both lists to signaling only for the first list, dynamically adapting the parameter transmission based on the actual state of reference pictures.
2Loss of information
If weighted prediction parameters are signaled for identical reference picture lists, then complete parameter information is provided, but data transmission redundancy increases
Solution Approach 1:
The patent uses a copying mechanism where the second reference picture list inherits weighted prediction parameters from the first list when equivalence is detected. Instead of transmitting duplicate parameters, the decoder copies parameters from the first list to the second list, eliminating data redundancy while ensuring parameter information completeness.
Solution Approach 2:
The patent makes the first reference picture list's parameters serve a dual function: they are used for the first list and also serve as the parameters for the second list when equivalence is detected. This multi-functionality eliminates redundant transmission while maintaining complete parameter information for both lists.
Data Source
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AI summary
The techniques are generally related to the coding of weighted prediction parameters. A video coder may determine the weighted prediction parameters for a reference picture list based on coded weighted prediction parameters for another reference picture list. Examples of the reference picture list include reference picture lists constructed for coding purposes, including a combined reference picture list.