Inter Prediction Candidate Merging for High-Resolution Video Blocks
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Solution Overview
Problem
Existing image encoding/decoding technologies face challenges in efficiently performing inter prediction for high-resolution and high-definition images, particularly in deriving accurate inter-prediction information for target blocks.
Innovation Solution
An encoding and decoding apparatus and method that generate combined inter-prediction information by combining inter-prediction information from neighbor blocks, including spatial and temporal neighbors, using techniques like weighted averaging and extrapolation, to enhance inter prediction accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If inter-prediction information from single neighbor blocks is used, then the encoding/decoding process is simple, but the prediction accuracy is insufficient for high-resolution images
Solution Approach 1:
The patent combines inter-prediction information from multiple neighbor blocks (above, below, left, right) to generate more accurate motion vectors and prediction data for the target block. This merging of information from multiple sources improves prediction accuracy for high-resolution images without requiring complex additional processing mechanisms.
Solution Approach 2:
The patent divides the prediction process into segments by considering different neighbor blocks separately (above, below, left, right) and then combining their information. This segmented approach allows systematic processing of each neighbor's contribution while maintaining overall simplicity.
2Reliability
If more neighbor blocks are considered for inter prediction, then prediction accuracy improves, but computational complexity increases
Solution Approach 1:
The patent applies partial action by selectively considering only the four immediate neighbor blocks (above, below, left, right) rather than all possible blocks in the reference frames. This provides sufficient prediction reliability for high-resolution images while avoiding the excessive computational power requirements that would result from analyzing all available reference blocks.
3Productivity
If combined inter-prediction information is generated from multiple neighbor blocks, then encoding efficiency improves, but the complexity of deriving prediction information increases
Solution Approach 1:
The patent merges inter-prediction information from multiple neighbor blocks by averaging their motion vectors and prediction data. This combining approach improves encoding efficiency for high-resolution images while maintaining relatively simple derivation processes through straightforward averaging operations rather than complex optimization algorithms.
Solution Approach 2:
The patent changes the parameter of prediction information derivation by transitioning from using a single neighbor block's data to combining data from multiple neighbor blocks. This parameter change (from one source to multiple sources) improves encoding efficiency while the averaging method keeps the derivation complexity manageable.
Data Source
AI summary
Disclosed herein are a video decoding method and apparatus and a video encoding method and apparatus. In video encoding and decoding, inter-prediction information for a target block may be derived, and inter prediction for a target block may be performed using the derived inter-prediction information. Combined inter-prediction information may be performed by combining multiple pieces of inter-prediction information, and the combined inter-prediction information may be added as a candidate to a list used for inter prediction. One of candidates in the list may be selected for inter prediction for the target block, and inter prediction using the selected candidate may be performed.