Intra-Prediction Mode Estimation for Lower Image Coding Overhead
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Solution Overview
Problem
Increasing the number of prediction modes for larger macroblocks in image coding decreases the likelihood of estimated prediction modes matching actual prediction modes, leading to inefficient coding and increased code amounts.
Innovation Solution
An intra-prediction mode estimation device that adaptively decides the number of estimated prediction modes based on reference blocks, allowing efficient coding by minimizing code usage while increasing the likelihood of matching actual prediction modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the number of prediction modes is increased for larger macroblocks, then the accuracy of prediction mode estimation is improved, but the code amount increases and coding efficiency decreases
Solution Approach 1:
The patent changes the parameter of prediction mode estimation by introducing adaptive estimation based on block size. For larger macroblocks, the system selectively estimates fewer prediction modes rather than increasing the number of modes, thereby maintaining estimation accuracy while reducing code amount.
Solution Approach 2:
The patent implements dynamic adaptation of prediction mode estimation strategy based on macroblock size. The decoding device dynamically adjusts the number of estimated prediction modes according to the actual block size, making the system flexible and efficient for different block dimensions.
2Adaptability or versatility
If the number of prediction modes is increased for larger macroblocks, then more prediction directions are available, but the likelihood of estimated prediction modes matching actual prediction modes decreases
Solution Approach 1:
The patent applies local quality by treating different macroblock sizes differently. Instead of using a uniform prediction mode estimation approach, the system adapts the estimation strategy locally according to block size, estimating fewer modes for larger blocks to maintain matching probability.
Solution Approach 2:
The patent uses partial action by estimating only a subset of prediction modes for larger macroblocks rather than all possible modes. This selective estimation maintains sufficient prediction capability while improving the probability of matching actual prediction modes.
3Device complexity
If a fixed number of estimated prediction modes is used for all block sizes, then the decoding process is simplified, but coding efficiency decreases for larger macroblocks
Solution Approach 1:
The patent introduces dynamic adaptation in the decoding process where the number of estimated prediction modes varies based on macroblock size. This dynamic approach improves coding efficiency for different block sizes while maintaining manageable decoding complexity through systematic adaptation.
Solution Approach 2:
The patent changes the parameter of estimated prediction mode count based on block size. By adapting this parameter dynamically, the system achieves better coding efficiency for larger macroblocks without excessively increasing decoding complexity.
Data Source
AI summary
A coding device and a decoding device are configured to include an estimated prediction mode deciding section (122a) including: a reference block selecting section (1223a) for selecting a reference block for use in estimating an intra-prediction mode for a subject block; an estimating number deciding section (1222a) for deciding an estimating number of estimated values to be estimated for the intra-prediction mode; and an estimated prediction mode deriving section (1221a) for estimating, based on a reference block, the estimating number of estimated values of the prediction mode.