Video Decoding Motion Vector Prediction Using Adjacent Block Availability
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Solution Overview
Problem
Current video decoding methods face challenges in efficiently encoding and decoding high-resolution or high-definition image content, particularly in determining reliable motion vectors for prediction, especially when motion information of adjacent blocks is unavailable.
Innovation Solution
A video decoding method that determines the availability of motion vectors for adjacent blocks at different resolutions, using available motion vectors as predictors or default motion vectors from other adjacent blocks, and performs prediction based on these vectors, even when primary motion information is unavailable, thereby improving coding efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion vector of adjacent block is used as predictor, then prediction accuracy is improved, but availability of motion information becomes the limiting factor
Solution Approach 1:
The patent performs preliminary checks to determine the availability of motion vectors from adjacent blocks before using them for prediction. By pre-assessing whether motion information is available from neighboring blocks at different resolutions, the system prepares fallback options in advance, ensuring that prediction can proceed reliably even when primary motion information is unavailable.
Solution Approach 2:
The patent introduces an intermediary mechanism that selects motion vectors from adjacent blocks at different resolutions (e.g., 1/4-pixel, 1/2-pixel, 1-pixel, 2-pixel, 4-pixel units) based on availability. This intermediary selection process acts as a mediator between the requirement for accurate prediction and the uncertainty of motion information availability, choosing the most appropriate motion vector source dynamically.
2Reliability
If multiple motion vector resolutions are checked, then reliability of prediction is improved, but decoding complexity increases
Solution Approach 1:
The patent segments the motion vector resolution checking into distinct stages corresponding to different pixel units (1/4, 1/2, 1, 2, 4). Instead of checking all resolutions simultaneously, the system divides the process into sequential segments, determining availability at each resolution level and proceeding to the next only if needed. This segmentation reduces the overall complexity by avoiding redundant checks across all resolutions.
Solution Approach 2:
The patent implements a dynamic checking process where the system adapts the resolution checking based on the availability of motion information. The decoding process dynamically adjusts which resolutions are checked and in what order, rather than following a fixed sequence. This dynamic approach optimizes the balance between reliability and complexity by performing only necessary checks.
3Productivity
If default motion vector from other adjacent blocks is used, then prediction can proceed when primary motion information is unavailable, but prediction accuracy may be reduced
Solution Approach 1:
The patent prepares cushioning measures in advance by establishing a hierarchy of motion vector sources at different resolutions. When the primary motion vector from an adjacent block is unavailable, the system has pre-defined fallback options from other adjacent blocks at various resolutions. This beforehand cushioning ensures that prediction can always proceed with an alternative, minimizing interruptions while maintaining the best possible accuracy given the available information.
Data Source
AI summary
In a video encoding and decoding process, a video decoding method and a video decoding apparatus are provided to for determining whether a motion vector of an adjacent block at a location corresponding to one motion vector resolution among a plurality of motion vector resolutions is available, when the motion vector of the adjacent block is available, obtaining the motion vector of the adjacent block as a motion vector predictor of a current block, when the motion vector of the adjacent block is unavailable, obtaining a default motion vector by using a motion vector of one of two other adjacent blocks of the current block as a motion vector predictor of the current block, and performing prediction on the current block based on the motion vector predictor of the current block.