Motion Vector Prediction with Selective Neighbor Block Processing
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Solution Overview
Problem
Existing image encoding and decoding technologies face challenges in accurately predicting motion vectors and reducing the size of differential motion vectors in bitstreams.
Innovation Solution
An apparatus and method for encoding and decoding motion vectors that improve prediction accuracy by utilizing neighboring motion vectors and determining motion vector resolutions, allowing for the selection of available neighboring blocks to enhance prediction and reduce differential motion vector size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion vectors of all neighboring blocks are used for prediction, then prediction accuracy improves, but device complexity increases
Solution Approach 1:
The patent applies local quality by differentiating between available and unavailable neighboring blocks based on their specific characteristics (intra prediction mode, tile boundaries, CTU boundaries). Instead of uniformly processing all neighboring blocks, the method selectively applies motion vector prediction only to blocks that meet specific availability criteria, thereby improving prediction accuracy where possible while avoiding unnecessary complexity for blocks where prediction is not applicable.
2Measurement precision
If differential motion vectors are precisely encoded, then motion vector accuracy improves, but bitstream size increases
Solution Approach 1:
The patent applies partial action by selectively applying motion vector prediction and differential encoding only to neighboring blocks that are determined to be available. Instead of encoding differential motion vectors for all neighboring blocks, the method performs partial encoding based on availability conditions (intra prediction mode checks, tile boundary checks, CTU boundary checks), thereby reducing the total quantity of encoded data while maintaining precision where applicable.
3Adaptability or versatility
If motion vector prediction is performed for all block types, then prediction coverage improves, but processing time increases
Solution Approach 1:
The patent applies preliminary action by pre-determining the availability of neighboring blocks through condition checks (intra prediction mode, tile boundaries, CTU boundaries) before attempting motion vector prediction. This preliminary assessment allows the decoder to quickly identify which blocks require prediction processing and which can be skipped, thereby reducing overall processing time while maintaining comprehensive coverage for eligible blocks.
Data Source
AI summary
A method, performed by an image decoding apparatus, of decoding a motion vector, including obtaining information indicating a motion vector resolution of a current block from a bitstream; selecting a first neighboring block from among neighboring blocks adjacent to the current block, by using the obtained information indicating the motion vector resolution of the current block; based on the current block referring to a reference picture in a list 0, and the first neighboring block referring to the reference picture in the list 0, determining a prediction motion vector of the current block using a motion vector of the first neighboring block; based on the current block referring to the reference picture in the list 0 and the first neighboring block referring to a reference picture in a list 1, selecting a motion vector of a second neighboring block among the neighboring blocks as a basic motion vector, and determining the prediction motion vector of the current block using the determined basic motion vector; and determining a motion vector of the current block using the prediction motion vector of the current block.