Adaptive Reference Line Selection for Video Block Prediction
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Solution Overview
Problem
Existing video encoding and decoding methods struggle with effectively determining reference lines for prediction, particularly when a current block is not in contact with the upper boundary of a largest coding unit, leading to inefficient use of buffer size.
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 multiple reference lines when not, to optimize prediction and reduce buffer size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple 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 specific location and characteristics of the current block. Blocks contacting the upper boundary use one reference line, while non-contacting blocks use multiple reference lines, optimizing the balance between prediction accuracy and buffer utilization for each local region
2Productivity
If a fixed number of reference lines is used, then device complexity is reduced, but prediction efficiency decreases
Solution Approach 1:
The patent implements dynamics by making the number of reference lines variable rather than fixed. The system dynamically adjusts the number of reference lines (one or multiple) based on the block's position relative to the upper boundary, allowing the prediction mechanism to adapt to different spatial conditions and optimize efficiency
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.