Reference Line Prediction at Largest Coding Unit Boundaries
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Solution Overview
Problem
Existing video encoding and decoding methods struggle to effectively determine reference lines for prediction when a current block is in contact with or not in contact with the upper boundary of a largest coding unit, leading to inefficient buffer size management.
Innovation Solution
A method and apparatus that determine whether a current block is in contact with the upper boundary of a largest coding unit, using one reference line when in contact and N reference lines when not, where N is a natural number, to perform prediction on the current block.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If N reference lines are used for prediction, then prediction accuracy is improved, but buffer size increases
Solution Approach 1:
The patent applies local quality by differentiating the number of reference lines used based on the spatial position of the current block. When the current block is in contact with the upper boundary of a largest coding unit, only one reference line is used; when not in contact, N reference lines are used. This localized adaptation optimizes the balance between prediction accuracy and buffer size requirements.
2Quantity of substance
If adaptive reference line determination is implemented, then buffer size is reduced, but processing complexity increases
Solution Approach 1:
The patent implements preliminary action by pre-determining whether the current block is in contact with the upper boundary of the largest coding unit before selecting the number of reference lines. This conditional assessment is performed in advance of the prediction process, allowing the system to prepare the appropriate number of reference lines accordingly, thus managing buffer resources efficiently while maintaining clear processing logic.
Data Source
AI summary
Provided are a video decoding method and apparatus which, during video encoding and decoding processes, determine whether a current block is in contact with an upper boundary of a largest coding unit including the current block, when it is determined that the current block is in contact with the upper boundary of the largest coding unit, determine an upper reference line of the current block as one reference line, when it is determined that the current block is not in contact with the upper boundary of the largest coding unit, determine the upper reference line of the current block based on N reference lines, and use the determined upper reference line.