Video Prediction Encoding Motion Vector Selection
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Solution Overview
Problem
Bi-prediction in video compression encoding faces challenges in efficiently suppressing noise in predicted signals while minimizing coding bits, particularly in texture and flat regions with strong randomness, leading to variations in motion vectors between neighboring blocks.
Innovation Solution
A video predictive coding system that selectively determines one motion vector based on previously-encoded motion information to generate a predicted signal similar to the target block, reducing the amount of coding bits by encoding one motion vector and deriving the other from available motion information, thereby enhancing the smoothing effect.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If bi-prediction is used to generate predicted signals by averaging two predicted signals, then the smoothing effect is enhanced, but the amount of coding bits increases due to encoding two motion vectors
Solution Approach 1:
The patent extracts only one motion vector for encoding while deriving the other motion vector from previously-encoded motion information. This selective encoding approach reduces the coding bit overhead while maintaining the bi-prediction smoothing effect, directly resolving the contradiction between enhanced smoothing and increased coding bits.
Solution Approach 2:
The patent uses previously-encoded motion information as a reference to derive the second motion vector, effectively copying and reusing existing motion data. This approach avoids redundant encoding of the second motion vector while maintaining prediction accuracy, thus reducing coding bits without sacrificing the smoothing effect.
2Adaptability or versatility
If motion vectors are determined for each block independently, then the adaptability to local characteristics is improved, but the variations in motion vectors between neighboring blocks increase
Solution Approach 1:
The patent performs preliminary encoding of motion information from previously-encoded blocks before determining the current block's motion vector. By using this pre-encoded motion information as a reference, the patent reduces variations between neighboring blocks while maintaining local adaptability, effectively resolving the contradiction between adaptability and stability.
3Measurement precision
If two motion vectors are encoded for bi-prediction, then the prediction accuracy is improved, but the coding complexity increases
Solution Approach 1:
The patent enables the second motion vector to be self-derived from previously-encoded motion information without requiring separate encoding. This self-service approach maintains prediction accuracy through bi-prediction while significantly reducing coding complexity by eliminating redundant encoding operations.
Data Source
AI summary
A predicted signal generation unit provided in a video predictive encoding device estimates a zero-th motion vector for derivation of a zero-th predicted signal, selects a zero-th motion vector predictor similar to the zero-th motion vector, and generates zero-th side information containing a zero-th motion vector predictor index to identify the motion vector predictor and a motion vector difference determined from the zero-th motion vector and the zero-th motion vector predictor. The video predictive encoding device selects a motion vector for generation of a first predicted signal having a high correlation with a target region, generates first side information containing a first motion vector predictor index to identify the motion vector as a first motion vector predictor, sets the first motion vector predictor to a first motion vector, and combines the zero-th and first predicted signals to generate a predicted signal of the target region.