MVD Sign Predictor for Video Coding Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current video encoding and decoding technologies face inefficiencies in signaling motion vector difference (MVD) components, particularly in context-based coding, due to lack of bias in sign information, which limits the use of context-based coding techniques.
Innovation Solution
The implementation of a motion vector difference (MVD) component sign predictor allows for context-based coding by determining and signaling an indicator of whether the predicted sign matches the actual sign, enabling biased signaling and reducing the number of bits required.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If bypass-based coding is used for MVD sign information, then the coding process is simple, but the number of bits required increases and coding efficiency decreases
Solution Approach 1:
The patent applies preliminary action by predicting the MVD sign before coding. A sign predictor determines the expected sign of the MVD component, and this prediction is used to guide the subsequent coding process. By preparing the sign information in advance through prediction, the system enables more efficient context-based coding while maintaining accuracy.
Solution Approach 2:
The patent implements feedback by using an indicator that signals whether the predicted MVD sign is correct or incorrect. This feedback mechanism allows the decoder to adjust its interpretation based on the prediction accuracy, enabling context-based coding that adapts to the actual sign information while reducing the number of bits required.
2Productivity
If context-based coding is applied to MVD signs, then coding efficiency improves, but the system requires biased sign information which is currently unavailable
Solution Approach 1:
The patent changes the parameter of sign information by introducing a sign predictor that generates biased sign estimates. This transformation converts the originally unbiased MVD sign into a predicted sign with known statistical bias, enabling the use of context-based coding schemes that require such biased information for optimal performance.
Solution Approach 2:
The patent introduces an intermediary element - the MVD sign predictor and its associated indicator - that mediates between the raw MVD sign information and the context-based coding process. This intermediary provides the necessary biased sign information to enable context-based coding while maintaining compatibility with existing video coding frameworks.
Data Source
AI summary
Techniques are described to increase the coding efficiency of information indicating a sign of a motion vector difference (MVD) component. A video coder may determine a MVD component sign predictor, and determine whether the MVD component sign predictor is the MVD component sign based on an indicator that is transmitted or received. In some examples, the indicator may be context coded, which promotes coding efficiencies.