Video Decoder Normal-Prediction Fallback for Absent Weights
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Solution Overview
Problem
Existing video coding and decoding technologies perform weighted prediction processing even when no weight coefficient and offset value are present for reference lists, leading to incorrect prediction processing.
Innovation Solution
Implement a video decoding apparatus with separate weighted and normal prediction processing units, where the normal processing unit generates predictions when weight and offset values are absent for bi-prediction or uni-prediction, ensuring accurate prediction image generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If weighted prediction processing is always performed when weightedPredFlag is 1, then the prediction processing is simplified, but incorrect prediction results occur when weight coefficients and offset values are absent
Solution Approach 1:
The patent changes the control parameter logic by introducing a new condition check: when weightedPredFlag is 1 but weight coefficients and offset values are absent for both L0 and L1 lists, the system switches from weighted prediction to normal prediction mode. This parameter change resolves the contradiction by making the prediction mode adaptive based on the actual availability of weighting parameters, ensuring both processing simplicity and prediction accuracy.
2Reliability
If normal prediction processing is performed instead of weighted prediction when weight information is absent, then prediction accuracy is improved, but processing complexity increases due to separate processing units
Solution Approach 1:
The patent implements dynamic processing by making the prediction mode selectable rather than fixed. The prediction processing unit dynamically switches between weighted prediction and normal prediction based on runtime conditions (availability of weight coefficients and offset values). This dynamic approach avoids the need for completely separate processing units while maintaining both accuracy and simplicity.
Data Source
AI summary
In the related art, in some cases the weighted prediction processing is performed even in a case that normal prediction processing is to be performed. A video decoding apparatus includes a weighted prediction processing unit configured to decode a weight coefficient and an offset value from coded data and to generate a prediction image by multiplying an interpolation image by the weight coefficient and adding the offset value to the interpolation image, and a normal prediction processing unit configured to generate a prediction image from the interpolation image. In a case that in the weighted prediction processing unit, a bi-prediction is performed and information of the weight coefficient and the offset value is absent for both a reference list 0 and a reference list 1, the normal prediction processing unit generates a bi-prediction image.